To get an output Y = 1 from the circuit shown in the figure, the input must be
A)
A-0 B-1 C-0
done
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B)
A-0 B-0 C-1
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C)
A-1 B-0 C-1
done
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D)
A-1 B-0 C-0
done
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View Answer play_arrow
The ratio of the frequencies of the long wavelength limits of the Lyman and Balmer series of hydrogen is:
A)
27 : 5
done
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B)
5 : 27
done
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C)
4 : 1
done
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D)
1 : 4
done
clear
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The maximum energy\[{{K}_{\max }}\]of photoelectrons emitted in a photoelectric cell is measured using lights of various frequencies v. The graph in figure shows how\[{{K}_{\max }}\] varies with v. The slope of the graph is equal to
A)
the charge of an electron
done
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B)
the charge to mass ratio of an electron
done
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C)
the work function of the emitter in the cell
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D)
Planck's constant.
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View Answer play_arrow
Which energy state of the triply ionized beryllium\[(B{{e}^{+++}})\]has the same electron orbital radius as that of the ground state of hydrogen? Given Z for beryllium = 4.
A)
n = 1
done
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B)
n = 2
done
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C)
n = 3
done
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D)
n = 4
done
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In a hydrogen atom, the electron is in nth excited state. It comes down to first excited state by emitting ten different wavelengths. The value of n is
A)
6
done
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B)
7
done
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C)
8
done
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D)
9
done
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A small sphere of radius R held against the inner surface of a smooth spherical shell of radius 6R as shown in the figure. The masses of the shell and small spheres are 4M and M, respectively. This arrangement is placed on a smooth horizontal table. The small sphere is now released. The x-coordinate of the center of the shell when the smaller sphere reaches the other extreme position is
A)
R
done
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B)
2R
done
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C)
3R
done
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D)
4R
done
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View Answer play_arrow
An impulse J is applied on a ring of mass m along a line passing through its center O. The ring is placed on a rough horizontal surface. The linear velocity of center of ring once it starts rolling without slipping is
A)
\[J/m\]
done
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B)
\[J/2m\]
done
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C)
\[J/4m\]
done
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D)
\[J/3m\]
done
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View Answer play_arrow
The binding energies per nucleon of deuteron \[({{\,}_{1}}{{H}^{2}})\] and helium atom \[({{\,}_{2}}H{{e}^{4}})\] are 1.1 MeV and 7 MeV If two deuteron atoms react to form a single helium atom, then the energy released is:
A)
13.9 MeV
done
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B)
26.9 MeV
done
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C)
23.6 MeV
done
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D)
19.2 MeV
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The half-life period of a radioactive element X is same as the mean-life time of another radioactive element Y. Initially both of them have the same number of atoms. Then
A)
X and Y have the same decay rate initially
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B)
X and Y decay at the same rate always
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C)
Y will decay at a faster rate than X
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D)
X will decay at a faster rate than Y
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View Answer play_arrow
The value of alternating emf \[\varepsilon \] in the given circuit will be
A)
220 V
done
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B)
140 V
done
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C)
100 V
done
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D)
20 V
done
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View Answer play_arrow
An electron in hydrogen atom after absorbing a photon jumps from energy state\[{{n}_{1}}\] to\[{{n}_{2}}\]. Then it returns to ground state after emitting six different wavelength in emission spectrum. The energy of emitted photons is either equal to less than or greater than the absorbed photons. Then \[{{n}_{1}}\]and \[{{n}_{2}}\]are
A)
\[{{n}_{2}}=4,{{n}_{1}}=3\]
done
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B)
\[{{n}_{2}}=5,{{n}_{1}}=3\]
done
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C)
\[{{n}_{2}}=4,{{n}_{1}}=2\]
done
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D)
\[{{n}_{2}}=4,{{n}_{1}}=1\]
done
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View Answer play_arrow
\[{{K}_{\alpha }}\]wavelength emitted by an atom of atomic number Z = 11 is \[\lambda .\]Find the atomic number for an atom that emits \[{{K}_{\alpha }}\]radiation with wavelength \[4\lambda .\]
A)
Z = 6
done
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B)
Z = 4
done
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C)
Z = 11
done
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D)
Z = 44
done
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View Answer play_arrow
Let\[{{K}_{1}}\]be the maximum kinetic energy of photo electrons emitted by light of wavelength\[{{\lambda }_{1}}\]and\[{{K}_{2}}\]corresponding to wavelength\[{{\lambda }_{2}}.\]If \[{{\lambda }_{1}}=2{{\lambda }_{2}},\] then
A)
\[2{{K}_{1}}={{K}_{2}}\]
done
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B)
\[{{K}_{1}}=2{{K}_{2}}\]
done
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C)
\[{{K}_{1}}<{{K}_{2}}/2\]
done
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D)
\[{{K}_{1}}>2{{K}_{2}}\]
done
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View Answer play_arrow
100 g of water is heated from Ignoring the slight expansion of the water, the change in its internal energy is (specific heat of water is 4184 J Kg/K)
A)
4.2 kJ
done
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B)
8.4 kJ
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C)
84 kJ
done
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D)
2.1 kJ
done
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View Answer play_arrow
When a plane electromagnetic wave travels in vacuum, the average electric energy density is given by (here \[{{E}_{0}}\]is the amplitude of the electric field of the wave)
A)
\[\frac{1}{4}{{\varepsilon }_{0}}E_{0}^{2}\]
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B)
\[\frac{1}{2}{{\varepsilon }_{0}}E_{0}^{2}\]
done
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C)
\[2{{\varepsilon }_{0}}E_{0}^{2}\]
done
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D)
\[4{{\varepsilon }_{0}}E_{0}^{2}\]
done
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View Answer play_arrow
A block floats in a liquid contained in a beaker. The beaker is placed on the floor of an elevator. If the elevator descends with acceleration a (< g), the up thrust on the block due to the liquid
A)
is equal to the weight of the liquid displaced.
done
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B)
is greater than the weight of the liquid displaced.
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C)
is less than the weight of the liquid displaced.
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D)
becomes equal to zero.
done
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View Answer play_arrow
The potential difference between points A and B in the circuit shown in the figure will be:
A)
1 V
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B)
2 V
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C)
3V
done
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D)
4 V
done
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View Answer play_arrow
Two condensers of capacity C and 2C are connected in parallel and are charged to a potential difference V. If now the battery is removed and a material of dielectric constant K is placed between the plates of condenser of capacity C, then the potential difference across the condensers will be
A)
\[\frac{3V}{K+2}\]
done
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B)
\[3V(K+2)\]
done
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C)
\[\frac{K+2}{3V}\]
done
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D)
\[\frac{3(K+2)}{V}\]
done
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View Answer play_arrow
The dimensions of specific heat are
A)
\[ML{{T}^{-2}}{{K}^{-1}}\]
done
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B)
\[M{{L}^{2}}{{T}^{-2}}{{K}^{-1}}\]
done
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C)
\[{{M}^{0}}{{L}^{2}}{{T}^{-2}}{{K}^{-1}}\]
done
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D)
\[{{M}^{0}}L{{T}^{-2}}{{K}^{-1}}\]
done
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View Answer play_arrow
The image of a small electric bulb fixed on the wall of a room is to be obtained on the opposite wall 3 m away by means of a convex lens. What is the maximum focal length of the lens for this purpose?
A)
0.5 m
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B)
0.75 m
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C)
1.0 m
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D)
1.5 m
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The diameter of a Plano-convex lens is 6 cm and the thickness at the center is 3 mm. If the speed of light in the material of the lens is \[2\times {{10}^{8}}\,m/s,\]the focal length of the lens is
A)
15 cm
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B)
20 cm
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C)
30 cm
done
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D)
10 cm
done
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View Answer play_arrow
A uniform rod of length 2L is placed with one end in contact with the horizontal and is then inclined at an angle a to the horizontal and allowed to fall without slipping at contact point When it becomes horizontal, its angular velocity will be
A)
\[\omega =\sqrt{\frac{3g\sin \alpha }{2L}}\]
done
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B)
\[\omega =\sqrt{\frac{2L}{3g\,\sin \alpha }}\]
done
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C)
\[\omega =\sqrt{\frac{6g\sin \alpha }{L}}\]
done
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D)
\[\omega =\sqrt{\frac{L}{g\sin \alpha }}\]
done
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View Answer play_arrow
A body of radius R and mass m is rolling horizontally without slipping with speed u. It then rolls up a hill to a maximum height \[h=\frac{3{{u}^{2}}}{4g}.\]The body might be
A)
solid sphere
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B)
hollow sphere
done
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C)
disc
done
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D)
ring
done
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View Answer play_arrow
A capacitor of capacitance C is charged to a potential difference V from a cell and then disconnected from it. A charge +Q is now given to its positive plate. The potential difference across the capacitor is now
A)
V
done
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B)
\[V+\frac{Q}{C}\]
done
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C)
\[V+\frac{Q}{2C}\]
done
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D)
\[V-\frac{Q}{C},\]if \[V<CV\]
done
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View Answer play_arrow
A wheel having metal spokes 1 m long between its axle and rim is rotating in a magnetic field of flux density \[5\times {{1}^{-5}}T\]normal to the plane of the wheel. An emf of 22/7 mV is produced between the rim and the axle of the wheel. The rate of rotation of the wheel in radians per second is:
A)
10
done
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B)
20
done
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C)
30
done
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D)
40
done
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View Answer play_arrow
The variation of induced emf (e) with time (t) in a coil, if a short bar magnet in moved along its axis with a constant velocity is best represented as follows:
A)
done
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B)
done
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C)
done
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D)
done
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View Answer play_arrow
In the Young's double slit experiment, separation between the two slits is 0.9 mm and the fringes are observed one meter away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, then wavelength of the monochromatic source of light used is:
A)
400 nm
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B)
450 nm
done
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C)
500 nm
done
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D)
600 nm
done
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View Answer play_arrow
A liquid cools from \[50{}^\circ C\] to \[45{}^\circ C\] in 5 minutes and from \[45{}^\circ C\] to \[41.5{}^\circ C\] in the next 5 minutes. The temperature of the surrounding is
A)
\[27{}^\circ C\]
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B)
\[40.3{}^\circ C\]
done
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C)
\[23.3{}^\circ C\]
done
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D)
\[33.3{}^\circ C\]
done
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View Answer play_arrow
A particle starts from rest at t = 0 and moves in a straight line with an acceleration as shown in figure. The velocity of the particle at t = 2.5 s is
A)
2 m/s
done
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B)
4 m/s
done
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C)
6 m/s
done
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D)
8 m/s
done
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View Answer play_arrow
The displacement\[x\]of a particle moving along a straight line varies with time t as, \[x=a{{e}^{-\alpha t}}+b{{e}^{-\beta t}},\]where\[a,b,\alpha \]and\[\beta \]are positive constants. The velocity of the particle will
A)
go on decreasing with time
done
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B)
be independent of and \[\beta \]
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C)
drop to zero when \[\alpha =\beta \]
done
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D)
go on increasing with time
done
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View Answer play_arrow
The vector that must be added to the vectors \[\hat{j}-3\hat{j}+2\hat{k}\]and \[3\hat{i}-6\hat{j}-7\hat{k}\]so that, the resultant vector is a unit-vector along the Y-axis is
A)
\[4\hat{i}+2\hat{j}+5\hat{k}\]
done
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B)
\[-4\hat{i}-2\hat{j}+5\hat{k}\]
done
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C)
\[3\hat{i}+4\hat{j}+5\hat{k}\]
done
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D)
Null vector
done
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View Answer play_arrow
A 60 kg block is suspended by two cables as shown in the figure. The ratio of tensions \[{{T}_{1}}\] and \[{{T}_{2}}\]is
A)
\[\sqrt{3}:1\]
done
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B)
\[1:\sqrt{3}\]
done
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C)
\[2:\sqrt{3}\]
done
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D)
\[\sqrt{3}:2\]
done
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View Answer play_arrow
The speed of projectile at its maximum height is half of its initial speed. The angle of projection is
A)
\[{{60}^{o}}\]
done
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B)
\[{{15}^{o}}\]
done
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C)
\[{{30}^{o}}\]
done
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D)
\[{{45}^{o}}\]
done
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View Answer play_arrow
A body is thrown horizontally from the top of a tower of height 5 m. It touches the ground at a distance of 10m from the foot of the tower. The initial velocity of the body is\[(g=10\text{ }m/{{s}^{2}})\]
A)
2.5 m/s
done
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B)
5 m/s
done
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C)
10 m/s
done
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D)
20 m/s
done
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View Answer play_arrow
A block of mass \[{{m}_{1}}\]is suspended from the ceiling of a room through a rope of mass\[{{m}_{2}}.\] The ceiling pulls the chain by a force
A)
\[{{m}_{1}}g\]
done
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B)
\[({{m}_{1}}+{{m}_{2}})g\]
done
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C)
\[\frac{({{m}_{1}}{{m}_{2}})g}{2}\]
done
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D)
\[{{m}_{2}}g\]
done
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View Answer play_arrow
Two blocks of mass M and m are kept on the trolley whose all surfaces are smooth. Select the correct statement
A)
If F = 0 blocks cannot remain stationary
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B)
For one unique value of F, blocks will be stationary
done
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C)
Blocks cannot be stationary for any value of F because all surfaces are smooth
done
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D)
Both (1) and (2)
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View Answer play_arrow
A plane metallic sheet is placed with its face parallel to the lines of magnetic field B of a uniform field, A particle of mass m and charge q is projected with a velocity u from a distance d from the plane normal to the magnetic field lines. Then the maximum velocity of projection for which the particle does not hit the plate is:
A)
2Bqd/m
done
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B)
Bqd/m
done
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C)
Bqd/2 m
done
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D)
Bqm/d
done
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View Answer play_arrow
A particle of mass m moving with a velocity u makes an elastic one dimensional collision with a stationary particle of mass m establishing a contact with it for an extremely small time T. Their force of contact increases from 0to\[{{F}_{0}}\]linearly in time\[T/4,\] remains constant for a further time\[T/2\]and decreases linearly from\[{{F}_{0}}\]to 0 in further time \[T/4\] as shown in the figure. The magnitude possessed by\[{{F}_{0}}\] is
A)
\[\frac{mu}{T}\]
done
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B)
\[\frac{2mu}{T}\]
done
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C)
\[\frac{4mu}{3T}\]
done
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D)
\[\frac{3mu}{4T}\]
done
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View Answer play_arrow
In an elastic collision
A)
the initial kinetic energy is equal to the final kinetic energy.
done
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B)
the final kinetic energy is less than the initial kinetic energy.
done
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C)
the kinetic energy remains constant.
done
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D)
the kinetic energy first increases then decreases.
done
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View Answer play_arrow
A spring of force constant 800 N/m has an extension of 5 cm. The work done in extending it from 5 cm to 15 cm is
A)
16 J
done
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B)
8 J
done
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C)
32 J
done
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D)
24 J
done
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View Answer play_arrow
A rectangular tank is filled to the brim with water. When a hole at its bottom is unplugged, the tank is emptied in time T. If the tank is half-filled with water, it will be emptied in time
A)
\[\frac{T}{\sqrt{2}}\]
done
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B)
\[\frac{T}{\sqrt{3}}\]
done
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C)
\[\frac{T}{2}\]
done
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D)
\[\frac{T}{2\sqrt{2}}\]
done
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View Answer play_arrow
A particle is executing simple harmonic motion along the \[x-\]axis with amplitude 4 cm and time period 1.2 s. The minimum time taken by the particle to move from \[x=+2\,cm\] to \[x=+4\,cm\]and back again is
A)
0.6 s
done
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B)
0.4 s
done
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C)
0.3 s
done
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D)
0.2 s
done
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View Answer play_arrow
Two rods of the same length, same cross sectional area and same material transfer a given amount of heat, in 12 seconds when they are joined end to end. But when they are joined lengthwise, they will transfer the same amount of heat, in the same conditions, in
A)
24 s
done
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B)
\[3\,s\]
done
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C)
\[1.5\,s\]
done
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D)
\[48\,s\]
done
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View Answer play_arrow
A parallel plate capacitor is made by stacking 10 identical metallic plates equally spaced from one another and having the same dielectric between plates. The alternate plates are then connected. If the capacitor formed by two neighboring plates has a capacitance C, the total capacitance of the combination will be
A)
\[\frac{C}{10}\]
done
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B)
\[\frac{C}{9}\]
done
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C)
\[~9\,C\]
done
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D)
\[10\,C\]
done
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View Answer play_arrow
In a certain organ pipe three successive resonance frequencies are observed at 425,595 and 765 Hz respectively. If the speed of sound in air is 340 m/s, the length of the pipe is:
A)
2 m
done
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B)
1 m
done
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C)
1.5 m
done
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D)
2.5 m
done
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View Answer play_arrow
Heat of neutralization of strong acid and strong base is constant and equal to
A)
8.7 kcal
done
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B)
13.7 kcal
done
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C)
23.7 kcal
done
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D)
30.7 kcal
done
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View Answer play_arrow
The first law of thermodynamics is represented by
A)
\[\Delta E=\Delta Q+\Delta W\]
done
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B)
\[\Delta E=\Delta Q+\Delta W\]
done
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C)
\[\Delta E =\Delta Q+\Delta W\]
done
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D)
\[\Delta E =Q-W\]
done
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View Answer play_arrow
The hybridization shown by six carbon atoms in benzene is
A)
\[~3sp\text{ }3s{{p}^{2}}\]
done
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B)
\[~3s{{p}^{3}}\text{ }3s{{p}^{2}}\]
done
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C)
\[~3s{{p}^{3}}\text{ }3sp\]
done
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D)
\[~6s{{p}^{2}}\]
done
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View Answer play_arrow
The metal that forms a self-protecting film of oxide to prevent corrosion is
A)
Ag
done
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B)
Au
done
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C)
Al
done
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D)
Cu
done
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View Answer play_arrow
Which of the following explains the sequence of filling the electrons in different shell?
A)
Aufbau's principle
done
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B)
Octate rule
done
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C)
Hund's rule
done
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D)
All the above
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View Answer play_arrow
\[{{H}_{2}}{{O}_{2}}\]is a reducing agent in the reaction
A)
\[A{{g}_{2}}O+{{H}_{2}}{{O}_{2}}\to 2Ag+{{H}_{2}}O+{{O}_{2}}\]
done
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B)
\[{{H}_{2}}{{O}_{2}}+S{{O}_{2}}\to {{H}_{2}}S{{O}_{4}}\]
done
clear
C)
\[2KI+{{H}_{2}}{{O}_{2}}\to 2KOH+{{I}_{2}}\]
done
clear
D)
\[PbS+4{{H}_{2}}{{O}_{2}}\to PbS{{O}_{4}}+4{{H}_{2}}O\]
done
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View Answer play_arrow
The molarity of a solution containing 5 g of \[NaOH\] in 250 ml solution
A)
0.5
done
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B)
1.0
done
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C)
1.3
done
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D)
4.0
done
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View Answer play_arrow
A gas expands isothermally against a constant external pressure of I atmosphere from a volume of \[10\text{ }d{{m}^{3}}\]to a volume of \[20\text{ }d{{m}^{3}}.\]In this process it absorbs 800 J of thermal energy from its surroundings. The \[\Delta U\]for the process in Joules is
A)
-113 J
done
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B)
+113 J
done
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C)
-213 J
done
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D)
+313 J
done
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View Answer play_arrow
The most stable is
A)
\[KH\]
done
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B)
\[NaH\]
done
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C)
\[RbH\]
done
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D)
\[LiH\]
done
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View Answer play_arrow
Nitrobenzene and hydrogen in the presence of zinc combines to form
A)
Azoxybenzene
done
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B)
Azobenzene
done
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C)
Benzene
done
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D)
Aniline
done
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View Answer play_arrow
The gas used in air ships is
A)
\[He\]
done
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B)
\[Xe\]
done
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C)
\[Ar\]
done
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D)
\[Ne\]
done
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View Answer play_arrow
Ethyl alcohol is soluble in water due to
A)
Basic nature
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B)
Acidic nature
done
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C)
Formation of hydrogen bond
done
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D)
Dissociation in water
done
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View Answer play_arrow
In a chemical equilibrium, the rate constant of forward reaction is \[75\times {{10}^{-4}}\]and the equilibrium constant is 1.5. The rate constant backward reaction is
A)
\[4.5\times {{10}^{4}}\]
done
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B)
\[5\times {{10}^{-4}}\]
done
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C)
\[2.5\times {{10}^{-4}}\]
done
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D)
\[6\times {{10}^{4}}\]
done
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View Answer play_arrow
Natural rubber is a polymer of
A)
Ethylene
done
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B)
1, 4-butadiene
done
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C)
Isoprene
done
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D)
Terephthalic acid
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View Answer play_arrow
The wavelength of\[\,{{\,}_{6}}{{C}^{14}}\] is\[2.31\times {{10}^{-4}}.\]Its half-life is
A)
\[2\times {{10}^{3}}\,years\]
done
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B)
\[1.5\times {{10}^{3}}\,years\]
done
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C)
\[3\times {{10}^{3}}\,years\]
done
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D)
\[2.5\times {{10}^{3}}\,years\]
done
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View Answer play_arrow
Conversion of starch into maltose takes place by the enzyme
A)
Zymase
done
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B)
Invertase
done
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C)
Diastase
done
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D)
Maltose
done
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View Answer play_arrow
The oxide which forms dimer is
A)
\[{{N}_{2}}{{O}_{3}}\]
done
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B)
\[{{N}_{2}}{{O}_{5}}\]
done
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C)
\[N{{O}_{2}}\]
done
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D)
\[{{N}_{2}}O\]
done
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View Answer play_arrow
The hardest naturally occurring substance is
A)
Graphite
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B)
Iron
done
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C)
Diamond
done
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D)
Astatine
done
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View Answer play_arrow
Wax belong to the class
A)
Acid
done
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B)
Esters
done
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C)
Alcohol
done
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D)
Ether
done
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View Answer play_arrow
The heat of formation of \[C{{O}_{2}}\]is -95 kcal. The amount of carbon which on burning will evolve 1000 kcal is
A)
15.63 g
done
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B)
12.95 g
done
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C)
126.3 g
done
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D)
160.5 g
done
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View Answer play_arrow
The normality of orthophosphoric acid having purity of 70 per cent by weight and specific gravity 1.54 is
A)
UN
done
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B)
15 N
done
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C)
33 N
done
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D)
30 N
done
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View Answer play_arrow
Which particle contains 2 neutrons and 1 proton?
A)
11 N
done
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B)
15 N
done
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C)
33 N
done
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D)
30 N
done
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View Answer play_arrow
Philosopher's wool on heating with \[BaO\] at \[1100{{\,}^{o}}C\] produces
A)
\[BaZn{{O}_{2}}\]
done
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B)
\[BaCd{{O}_{2}}\]
done
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C)
\[Ba{{O}_{2}}+Zn\]
done
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D)
\[Ba+Zn{{O}_{2}}\]
done
clear
View Answer play_arrow
Chloroform and concentrated\[HN{{O}_{3}}\]reacts to produce
A)
\[CHC{{l}_{2}}N{{O}_{3}}\]
done
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B)
\[CHC{{l}_{2}}NH{{O}_{3}}\]
done
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C)
\[CC{{l}_{3}}N{{O}_{2}}\]
done
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D)
\[CHCIN{{O}_{3}}\]
done
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View Answer play_arrow
Gold number is associated with
A)
Protective colloids
done
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B)
Amount of pure gold
done
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C)
Purple of Cassius
done
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D)
Electrophoresis
done
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View Answer play_arrow
Amino acids are the building blocks of
A)
Vitamins
done
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B)
Fats
done
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C)
Carbohydrates
done
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D)
Proteins
done
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View Answer play_arrow
The number of atoms in 4.25 g of\[N{{H}_{3}}\] is
A)
\[2.054\times {{10}^{23}}\]
done
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B)
\[5.043\times {{10}^{25}}\]
done
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C)
\[8.044\times {{10}^{23}}\]
done
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D)
\[6.023\times {{10}^{23}}\]
done
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View Answer play_arrow
The conjugate acid of \[N{{H}_{3}}\]is
A)
\[N{{H}_{4}}^{+}\]
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B)
\[{{N}_{2}}{{H}_{4}}\]
done
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C)
\[N{{H}_{2}}OH\]
done
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D)
\[N{{H}_{3}}\]
done
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View Answer play_arrow
Adiabatic process involves
A)
\[\Delta E =0\]
done
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B)
\[\Delta W=0\]
done
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C)
\[\Delta q=0\]
done
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D)
\[\Delta V=0\]
done
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View Answer play_arrow
The rate of reaction depends upon
A)
Molar concentration
done
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B)
Equivalent mass
done
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C)
Atomic mass
done
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D)
None of the above
done
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View Answer play_arrow
The purest form of iron is
A)
Steel
done
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B)
Wrought Iron
done
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C)
Pig Iron
done
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D)
None of the above
done
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View Answer play_arrow
The largest size of the ion is
A)
\[C{{l}^{-}}\]
done
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B)
\[{{K}^{+}}\]
done
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C)
\[C{{a}^{++}}\]
done
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D)
\[{{S}^{--}}\]
done
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View Answer play_arrow
The empirical formula of a compound is \[C{{H}_{2}}O.\]Its molecular weight is 180. The molecular formula of the compound is
A)
\[{{C}_{4}}{{H}_{8}}{{O}_{4}}\]
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B)
\[{{C}_{6}}{{H}_{12}}{{O}_{6}}\]
done
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C)
\[{{C}_{3}}{{H}_{6}}{{O}_{3}}\]
done
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D)
\[{{C}_{5}}{{H}_{10}}{{O}_{5}}\]
done
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View Answer play_arrow
The Bohr's orbit radius for the hydrogen atom (n = 1) is approximately \[0.530\,\overset{\text{o}}{\mathop{A}}\,.\]The radius for the first excited state (n = 2) orbit is
A)
1.08 A
done
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B)
2.12 A
done
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C)
5.24 A
done
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D)
6.36 A
done
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View Answer play_arrow
The first ionization potential is maximum for
A)
Iron
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B)
Hydrogen
done
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C)
Lithium
done
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D)
Uranium
done
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View Answer play_arrow
Roasting of an ore is done in
A)
Presence of air
done
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B)
Vacuum
done
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C)
Absence of air
done
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D)
None of the above
done
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View Answer play_arrow
The dissociation constant of two acids \[\text{H}{{\text{A}}_{\text{1}}}\]and \[\text{H}{{\text{A}}_{2}}\]are\[3.0\times {{10}^{-4}}\]and \[1.8\times {{10}^{-5}}\] respectively. The relative strength is
A)
10 : 1
done
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B)
1 : 12
done
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C)
4 : 1
done
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D)
1 : 5
done
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View Answer play_arrow
The alkyl halide is converted into alcohol by
A)
Addition
done
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B)
Elimination
done
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C)
Halogenation
done
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D)
Substitution
done
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View Answer play_arrow
An aqueous solution of ammonium acetate is
A)
Acidic
done
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B)
Basic
done
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C)
Neutral
done
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D)
None of the above
done
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View Answer play_arrow
By passing a beam of light through a colloidal solution, it is
A)
Adsorbed
done
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B)
Refracted
done
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C)
Scattered
done
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D)
Reflected
done
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View Answer play_arrow
The highest melting halide is
A)
\[NaF\]
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B)
\[Nal\]
done
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C)
\[NaCl\]
done
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D)
\[NaBr\]
done
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View Answer play_arrow
The pH of a \[{{10}^{-10}}\]molar solution of \[HCl\] in water is
A)
6.0
done
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B)
7.0
done
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C)
8
done
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D)
13
done
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View Answer play_arrow
The product formed by the reduction of glycol acid with HI is
A)
Glycol
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B)
Acetic acid
done
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C)
Formic acid
done
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D)
lodoacetic acid
done
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View Answer play_arrow
Hydrogen can be differentiated by other alkali meta due to its
A)
Non-metallic character
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B)
Electropositive character
done
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C)
Reducing character
done
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D)
Affinity for non-metals
done
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View Answer play_arrow
Copper turning on heating with concentrated \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]produces
A)
\[\text{S}{{\text{O}}_{3}}\]
done
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B)
\[{{H}_{2}}S\]
done
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C)
\[{{O}_{2}}\]
done
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D)
\[S{{O}_{2}}\]
done
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View Answer play_arrow
Evaporation of water is
A)
Endothermic change
done
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B)
No heat change takes place
done
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C)
Exothermic change
done
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D)
Chemical reaction
done
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View Answer play_arrow
The Bayer's reagent is
A)
Alkaline\[KMn{{O}_{4}}\]solution
done
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B)
Neutral\[KMn{{O}_{4}}\]solution
done
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C)
Acidic \[KMn{{O}_{4}}\]solution
done
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D)
Saturated \[KMn{{O}_{4}}\]solution
done
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View Answer play_arrow
Ethyl amine reacts with chloroform and potassium hydroxide to produce
A)
Ethyl cyanide
done
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B)
Ethyl isocyanide
done
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C)
Ethyl chloride
done
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D)
Ethyl alcohol
done
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View Answer play_arrow
The number of double bonds in gammexane is
A)
0
done
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B)
2
done
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C)
3
done
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D)
1
done
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View Answer play_arrow
The chloramphenicol is an example of
A)
Analgesics
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B)
Antibiotic
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C)
Antiseptic
done
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D)
Antipyretics
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View Answer play_arrow
Amoeba is a/an
A)
Unicellular animal
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B)
Octacellular animal
done
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C)
Multicellular animal
done
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D)
All of the above
done
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View Answer play_arrow
A herbarium sheet
A)
Carries a label providing information about the date and place of collection.
done
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B)
Also provides English, local and botanical names.
done
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C)
The family name of specimen and the collector's name is also mentioned.
done
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D)
More than one option is correct.
done
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View Answer play_arrow
The enzyme present in saliva is
A)
Maltase
done
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B)
Ptyalin
done
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C)
Sucrase
done
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D)
Invertase
done
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View Answer play_arrow
Identify the virus and name the structures A and B:
A)
\[TMV,\text{ }A=ssRNA,B=Capsid\]
done
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B)
\[TMV,\,A=dsRNA,\text{ }B=Capsid\]
done
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C)
\[~TMV,A=Capsid,B=ssRNA\]
done
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D)
\[TMV,A=Capsid,B=dsRNA\]
done
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View Answer play_arrow
Fungi in a forest ecosystem is
A)
Producer
done
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B)
Decomposer
done
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C)
Top consumer
done
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D)
Autotroph
done
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View Answer play_arrow
Thermococcus, Methanococcus and Methanobacterium exemplify
A)
Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as mitochondria.
done
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B)
Bacteria that contain a cytoskeleton and ribosome.
done
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C)
Archaebacteria that contain proteins homologous to eukaryotic core histones.
done
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D)
Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled.
done
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View Answer play_arrow
Cyanobacteria is an
A)
Algae having blue-green pigment
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B)
Algae having red pigment
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C)
Algae having brown pigment
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D)
Algae having yellow-brown pigment
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View Answer play_arrow
Cu is present in
A)
Plasmalemma
done
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B)
Plastoquinone
done
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C)
Plastocyanin
done
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D)
Ferredoxin
done
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View Answer play_arrow
Identify the structure marked as A, B and C for Marchantia:
A)
A = Antheridiophore, B = Gemma cup, C = Rhizoids
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B)
A = Rhizoids, B = Gemma cup, C = Archegoniophore
done
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C)
A = Antheridiophore, B = Rhizoids, C = Gemma cup
done
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D)
A = Archegoniophore, B = Gemma cup, C = Rhizoids
done
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View Answer play_arrow
The largest phylum in respect of number of species is
A)
Coelenterate
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B)
Arthropoda
done
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C)
Protozoa
done
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D)
Porifera
done
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View Answer play_arrow
Chronic disturbance in hormone secretion of thyroid gland causes
A)
Goitre
done
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B)
Diabetes
done
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C)
Addison's disease
done
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D)
Colour blindness
done
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View Answer play_arrow
The formation of egg and sperm is affected by
A)
LH
done
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B)
MH
done
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C)
TSH
done
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D)
FSH
done
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View Answer play_arrow
ACTH is secreted by
A)
Thyroid gland
done
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B)
Thymus gland
done
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C)
Pituitary gland
done
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D)
Islets of Langerhans
done
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View Answer play_arrow
Enzymes of electron transport system are present in
A)
Inner mitochondrial membrane
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B)
Matrix
done
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C)
Intermembrane space
done
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D)
Endoplasmic reticulum
done
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View Answer play_arrow
Ozone hole results in
A)
UV radiation reaching the earth
done
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B)
Cataract
done
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C)
Increase in skin cancer
done
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D)
All of the above
done
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View Answer play_arrow
Greenhouse effect is due to the increased concentration of
A)
\[C{{O}_{2}}\]
done
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B)
Ne
done
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C)
\[S{{O}_{2}}\]
done
clear
D)
\[N{{O}_{2}}\]
done
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View Answer play_arrow
Gymnosperms are also called soft wood spermatophytes because they lack
A)
Cambium
done
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B)
Phloem fibres
done
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C)
Thick-walled tracheids
done
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D)
Xylem fibres
done
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View Answer play_arrow
Which of the following metal is present in vitamin\[{{B}_{12}}\]?
A)
Cobalt
done
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B)
Copper
done
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C)
Zinc
done
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D)
Magnesium
done
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View Answer play_arrow
Primary blood cells are formed in
A)
Plasma
done
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B)
Bone marrow
done
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C)
Liver
done
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D)
Spleen
done
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View Answer play_arrow
Secondary host of schistosoma is
A)
Hydra
done
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B)
Euglena
done
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C)
Snail
done
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D)
Pheretima
done
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View Answer play_arrow
Find the incorrect match with respect to the floral formula of the concerned families:
A)
Fabaceae -
done
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B)
Liliaceae -
done
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C)
Solanaceae -
done
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D)
Brassicaceae -
done
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View Answer play_arrow
Sertoli cells help in
A)
Maturation of eggs
done
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B)
Maturation of sperms
done
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C)
Enzyme production
done
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D)
Ovulation
done
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View Answer play_arrow
Opium is extracted from
A)
Atropa belladonna
done
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B)
Pap aver somniferum
done
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C)
Vinca rosea
done
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D)
Azadirachta indica
done
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View Answer play_arrow
Quinine is obtained from
A)
Bark of Cinchona
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B)
Root of Cinchona
done
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C)
Wood of Cinchona
done
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D)
Leaves of Cinchona
done
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View Answer play_arrow
When we peel the skin of a potato tuber, we remove
A)
Periderm
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B)
Epidermis
done
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C)
Cuticle
done
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D)
Sapwood
done
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View Answer play_arrow
Genes are present in
A)
Chromosomes
done
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B)
Lamellae
done
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C)
Plasma membrane
done
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D)
Mesosomes
done
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View Answer play_arrow
In the process of photosynthesis
A)
\[{{O}_{2}}\]is taken and \[C{{O}_{2}}\]is evolved.
done
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B)
\[{{O}_{2}}\]is taken but \[C{{O}_{2}}\]is not evolved.
done
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C)
\[C{{O}_{2}}\]is taken and \[{{O}_{2}}\] is evolved.
done
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D)
\[C{{O}_{2}}\]is taken and is evolved.
done
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View Answer play_arrow
Bacteria do not have
A)
Ribosome
done
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B)
Protein synthesizing apparatus
done
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C)
Mitochondria
done
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D)
Cell wall
done
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View Answer play_arrow
Which of the following plant hormone is extracted from fungus?
A)
Auxin
done
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B)
Gibberellin
done
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C)
Cytokinin
done
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D)
2, 4-D
done
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View Answer play_arrow
The highest concentration of auxin is found in
A)
Root and shoot tips
done
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B)
Leaves and fruits
done
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C)
Mid stem portion
done
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D)
None of the above
done
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View Answer play_arrow
Ethylene is used for
A)
Decreasing the senescence
done
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B)
Increasing the height of stem
done
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C)
Ripening of fruits
done
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D)
Prevention of leaf fall
done
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View Answer play_arrow
Meristematic tissues are
A)
Premature having the ability of division.
done
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B)
Mature does not have the ability of division.
done
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C)
Premature not having the ability of division.
done
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D)
Complex differentiating in xylem, phloem and cambium.
done
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View Answer play_arrow
The function of polymerase chain reaction (PCR) is
A)
Translation
done
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B)
Transduction
done
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C)
DNA amplification
done
clear
D)
None of these
done
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View Answer play_arrow
A codon is made up of
A)
Single nucleotide
done
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B)
Two nucleotides
done
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C)
Three nucleotides
done
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D)
Four nucleotides
done
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View Answer play_arrow
Protein in silk thread is
A)
Fibroin
done
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B)
Keratin
done
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C)
Albumin
done
clear
D)
Globulin
done
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View Answer play_arrow
Histamine is secreted by
A)
Goblet cells
done
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B)
Nerve cells
done
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C)
Kupffer cells
done
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D)
Mast cells
done
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View Answer play_arrow
Which of the following hormones are secreted by a pancreas?
A)
Insulin and glucagon
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B)
Epinephrine and norepinephrine
done
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C)
Thyroxine and melanin
done
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D)
Lactocin and oxytocin
done
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View Answer play_arrow
Starfish belongs to phylum
A)
Porifera
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B)
Coelenterate
done
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C)
Echinodermata
done
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D)
Arthropoda
done
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View Answer play_arrow
Yeast belongs to
A)
Zygomycetes
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B)
Basidiomycetes
done
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C)
Ascomycetes
done
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D)
Phycomycetes
done
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View Answer play_arrow
Mycorrhiza helps in
A)
Nutrition absorbing
done
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B)
Food manufacturing
done
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C)
Disease resistance
done
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D)
Disease prevention
done
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View Answer play_arrow
The conversion of \[NO_{3}^{-}\] to \[{{N}_{2}}\] is called
A)
Nitrification
done
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B)
Denitrification
done
clear
C)
Ammonification
done
clear
D)
Nitrogen fixation
done
clear
View Answer play_arrow
Cuscuta is a
A)
Parasitic plant
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B)
Symbiotic plant
done
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C)
Predator
done
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D)
Decomposer
done
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View Answer play_arrow
Binary fission is a mode of
A)
Micropropagation
done
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B)
Vegetative propagation
done
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C)
Macropropagation
done
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D)
Sexual reproduction
done
clear
View Answer play_arrow
Humidity in atmosphere decreases the rate of
A)
Transpiration
done
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B)
Photosynthesis
done
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C)
Glycolysis
done
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D)
Growth
done
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View Answer play_arrow
A phosphoglyceride is always made up of
A)
A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
done
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B)
A saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.
done
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C)
Only a saturated fatty acid esterified to glycerol molecule to which a phosphate group is also attached.
done
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D)
Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.
done
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View Answer play_arrow
Jumping genes in maize were discovered by
A)
Hugo de Vries
done
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B)
T. H. Morgan
done
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C)
Barbara McClintock
done
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D)
Mendel
done
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View Answer play_arrow
Sea horse belongs to
A)
Mammals
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B)
Amphibians
done
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C)
Aves
done
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D)
Pisces
done
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View Answer play_arrow
Which one of the following organelle in the figure correctly matches with its functions?
A)
RER, protein synthesis
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B)
RER, glycoproteins
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C)
Golgi apparatus, protein synthesis
done
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D)
Golgi apparatus, formation of glycolipids
done
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View Answer play_arrow
Ontogeny repeats phylogeny as a part of
A)
Recapitulation theory
done
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B)
Darwin's evolution theory
done
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C)
Lamarck's evolution theory
done
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D)
Weismann's theory
done
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View Answer play_arrow
A stage where cell division is shown in the figure Select the answer which gives the correct identification of the stage with its characteristics:
A)
Late anaphase Chromosomes move away from equatorial plate, Golgi complex not present.
done
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B)
Cytokinesis Cell plate formed, Mitochondria distributed between two daughter cells.
done
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C)
Telophase Endoplasmic reticulum and nucleolus not reformed yet.
done
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D)
Telophase Nuclear envelop reforms, Golgi complex reforms.
done
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View Answer play_arrow
Universal blood recipient is
A)
Blood group-O
done
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B)
Blood group-AB
done
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C)
Blood group-A
done
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D)
Blood group-B
done
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View Answer play_arrow
Plant like nutrition is present in
A)
Amoeba
done
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B)
Paramecium
done
clear
C)
Euglena
done
clear
D)
Plasmodium
done
clear
View Answer play_arrow
Which of the following is the connecting link between reptiles and birds?
A)
Archaeopteryx
done
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B)
Euglena
done
clear
C)
Neopilina
done
clear
D)
Latimeria
done
clear
View Answer play_arrow
Which of the following connects glycolysis to Krebs cycle?
A)
Acetyl-CoA
done
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B)
Ribozyme
done
clear
C)
Cytochrome oxidase
done
clear
D)
N-Acetylglucosamine
done
clear
View Answer play_arrow
Pyruvic acid is the end product of
A)
Krebs cycle
done
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B)
Electron transport system
done
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C)
Photosynthesis
done
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D)
Glycolysis
done
clear
View Answer play_arrow
Given below is the diagram of stomatal apparatus. Which option identifies the below labelling A, B, C, D correctly?
A)
A = Subsidiary cell, B = Epidermal cell, C Guard cell, D = Stomatal aperture.
done
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B)
A = Guard cell, B = Stomatal aperture, C Subsidiary cell, D = Epidermal cell.
done
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C)
A = Epidermal cell, B = Guard cell, C = Stomatal aperture, D = Subsidiary cell.
done
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D)
A = Epidermal cell, B = Subsidiary cell, C = Stomatal aperture, D = Guard cell.
done
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View Answer play_arrow
Which of the following is a viral disease?
A)
Typhoid
done
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B)
Polio
done
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C)
Tuberculosis
done
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D)
Leprosy
done
clear
View Answer play_arrow
Which one is a sex linked disease7
A)
Colour blindness
done
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B)
Haemophilia
done
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C)
Syphilis
done
clear
D)
Both (a) and (b)
done
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View Answer play_arrow
In the given diagram, A and B represents.
A)
Mineralization, Uemmeralisauon
done
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B)
Ammonification, Denitrification
done
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C)
Denitrification, Ammonification
done
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D)
Denitrification, Mineralization
done
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View Answer play_arrow
Which of the following has no specific organ for respiration but do respire?
A)
Rabbit
done
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B)
Cockroach
done
clear
C)
Earthworm
done
clear
D)
Frog
done
clear
View Answer play_arrow
Match the following and choose the correct option from those give below:
Column I Column II A. Molecular oxygen i. a-Ketoglutaric acid B. Electron acceptor ii. Hydrogen acceptor C. Pyruvate dehydrogenase iii. Cytochrome C D. Decarboxylation iv. Acetyl-CoA
A)
\[A\to ii,\,B\to iii,\,C\to iv,\,D\to i\]
done
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B)
\[A\to iii,\,B\to iv,\,C\to ii,\,D\to i\]
done
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C)
\[A\to ii,\,B\to i,\,C\to iii,\,D\to iv\]
done
clear
D)
\[A\to iv,\,B\to iii,\,C\to i,\,D\to ii\]
done
clear
View Answer play_arrow
Tendons and ligaments are
A)
Epithelial tissue
done
clear
B)
Fibrous connective tissue
done
clear
C)
Nerve tissue
done
clear
D)
Muscular tissue
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Mushroom belongs to
A)
Ascomycetes
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B)
Basidiomycetes
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C)
Phycomycetes
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D)
Zygomycetes
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The wall of bacteria consists of
A)
N-Acetylglucosamine
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B)
N-Acetylmuramic acid
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C)
Both (a) and (b)
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D)
Cellulose
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The movement of pollen tube is called
A)
Chemotropism
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B)
Thermotaxis
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C)
Thermonastic
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D)
Hydrotropism
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What will be the gametic chromosome number of a cell, if the somatic cell has 40 chromosomes?
A)
10
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B)
20
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C)
30
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D)
40
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Who coined the term 'cell'?
A)
Purkinje
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B)
Robert Brown
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C)
Robert Hooke
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D)
Hugo von Mohl
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Which of the following animals is widely used in genetics experiments?
A)
Butterfly
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B)
Fruit fly
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C)
Housefly
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D)
Dragonfly
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In which of the following stage, the chromosomes are arranged at equatorial plate?
A)
Anaphase
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B)
Metaphase
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C)
Prophase
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D)
Telophase
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Match the following:
Column I Column II A. IAA i. Herring sperm DNA B. ABA ii. Bolting C. Ethylene iii. Stomatal closure D. GA iv. Weed-free lawns E. Cytokinins v. Ripening of fruits
A)
\[A\to iv,B\to iii,C\to v,D\to ii,E-i\]
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B)
\[A\to v,B\to iii,C\to iv,D\to ii,E-i\]
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C)
\[A\to iv,B\to i,C\to v,D\to iii,E-ii\]
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D)
\[A\to v,B\to iii,C\to ii,D\to i,E-iv\]
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Who first conducted the experiment on evolution to prove biochemical origin of life?
A)
Miller and Urey
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B)
Darwin
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C)
Lamarck
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D)
Weismann
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Maturation of sperm before penetration is called
A)
Spermatogenesis
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B)
Spermatogenesis
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C)
Capacitation
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D)
Spermatid
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Echolocation is found in
A)
Bat
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B)
Cat
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C)
Dog
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D)
Horse
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Life span of RBC is
A)
50 days
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B)
70 days
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C)
120 days
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D)
220 days
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The phenomenon observed in some plants wherein parts of the sexual apparatus are used for forming embryos without fertilization is called
A)
Parthenocarpy
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B)
Apomixis
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C)
Vegetative propagation
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D)
Sexual reproduction
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In the \[{{F}_{2}}\]generation of a Mendelian dihybrid cross, the number of phenotypes and genotypes are
A)
Phenotypes - 4; genotypes - 16
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B)
Phenotypes - 9; genotypes - 4
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C)
Phenotypes - 4; genotypes - 8
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D)
Phenotypes - 4; genotypes - 9
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The back bone of RNA consists of which of the following sugar?
A)
Deoxyribose
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B)
Ribose
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C)
Sucrose
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D)
Maltose
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Phloem conducts food by
A)
Perforated sieve plates
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B)
Bast fibres
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C)
Xylem parenchyma
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D)
Xylem fibres
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The purpose of crop rotation is to
A)
Increase the fertility of soil
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B)
Decrease the fertility of soil
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C)
Prevent soil erosion
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D)
Prevent water erosion
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Which of the following is a nitrogen fixing organism?
A)
BGA
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B)
Rhizobium
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C)
Both (a) and (b)
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D)
Aspergillus
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To maintain constant body temperature is called
A)
Homeothermic
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B)
Poikilothermic
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C)
Homozygous
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D)
Heterozygous
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African sleeping sickness is caused by
A)
Trypanosoma
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B)
Leishmania
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C)
Latimeria
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D)
Plasmodium
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During blood clotting which of the following is used?
A)
Co
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B)
\[C{{a}^{2+}}\]
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C)
\[N{{a}^{+}}\]
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D)
\[C{{I}^{-}}\]
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The chromosome showing L-shaped structure by the presence of centromere is termed as
A)
Acentric
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B)
Metacentric
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C)
Sub-metacentric
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D)
Telocentric
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The infected stage of malarial parasite is
A)
Sporozoite stage
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B)
Schizozoite stage
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C)
Merozoite stage
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D)
Metacryptozoite stage
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If Meselson and Stahl?s experiment is continued for four generations in bacteria, the ratio of \[{{15}_{N}}/{{15}_{N}}:{{15}_{N}}/{{14}_{N}}:{{14}_{N}}/{{14}_{N}}\] containing DNA in the fourth generation would be
A)
1 : 1 : 0
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B)
1 : 4 : 0
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C)
0 : 1 : 3
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D)
0 : 1 : 7
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In RNAi, the genes are silenced using
A)
ssDNA
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B)
dsDNA
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C)
dsRNA
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D)
ssRNA
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Which of the following is concerned with \[C{{O}_{2}}\]fixation?
A)
Krebs cycle
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B)
Calvin cycle
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C)
Ornithine cycle
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D)
Glycolysis
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In photosynthesis there is
A)
Reduction of \[{{H}_{2}}O\]
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B)
Oxidation of \[{{H}_{2}}O\]
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C)
Oxidation of \[C{{O}_{2}}\]
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D)
Oxidation of \[N{{O}_{2}}\]
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ELISA test is used for the detection of
A)
Antibodies
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B)
Viral disease
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C)
AIDS
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D)
All of these
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