Solved papers for JEE Main & Advanced JEE Main Paper (Held On 09-Jan-2019 Morning)

done JEE Main Paper (Held On 09-Jan-2019 Morning) Total Questions - 90

• question_answer1) A Mixture of 2 moles of helium gas\[\left( atomic\text{ }mass=4u \right)\], and 1 mole of argon gas \[\left( atomic\text{ }mass=40u \right)\] is kept at 300 K in a container. The ratio of their rms speeds \[\left[ \frac{{{V}_{rms}}\,(helium)}{{{V}_{rms}}\,(argon\,)} \right]\] , is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  0.32
  done clear
  B)
  3.16
  done clear
  C)
  2.24
  done clear
  D)
  0.45
  done clear
  View Answer play_arrow

• question_answer2) Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  25 : 9   
  done clear
  B)
  4 : 1
  done clear
  C)
  5 : 3             
  done clear
  D)
  16 : 9
  done clear
  View Answer play_arrow

• question_answer3) A sample of radioactive material A, that has an activity of \[10\text{ }mCi(1\text{ }Ci=3.7\times {{10}^{10}}\,decays/s)\], has twice the number of nuclei as another sample of different radioactive material B which has an activity of \[20\text{ }mCi\]. The correct choices for half-lives of A and B would then be respectively: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  10 days and 40 days
  done clear
  B)
  20 days and 10 days
  done clear
  C)
  5 days and 10 days
  done clear
  D)
  20 days and 5 days
  done clear
  View Answer play_arrow

• question_answer4) Temperature difference of \[120{}^\circ \,C\] is maintained between two ends of a uniform rod AB of length 2L. Another bent rod PQ, of same cross-section as AB and length \[\frac{3L}{2}\], is connected across AB (See figure). In steady  state,  temperature  difference between P and Q will be close to:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[45{}^\circ \,C\]
  done clear
  B)
  \[75{}^\circ C\]
  done clear
  C)
  \[35{}^\circ C\]
  done clear
  D)
  \[60{}^\circ C\]
  done clear
  View Answer play_arrow

• question_answer5) A convex lens is put 10 cm from a light source and it makes a sharp image on a screen, kept 10 cm from the lens. Now a glass block (refractive index 1.5) of 1.5 cm thickness is placed in contact with the light source. To get the sharp image again, the screen is shifted by a distance d. Then d is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  0.55 cm towards the lens
  done clear
  B)
  0
  done clear
  C)
  0.55 cm away from the lens
  done clear
  D)
  1.1 cm away from the lens
  done clear
  View Answer play_arrow

• question_answer6) For a uniformly charged ring of radius R, the electric field on its axis has the largest magnitude at a distance h from its centre. Then value of h is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[R\sqrt{2}\]
  done clear
  B)
  R
  done clear
  C)
  \[\frac{R}{\sqrt{5}}\]
  done clear
  D)
  \[\frac{R}{\sqrt{2}}\]
  done clear
  View Answer play_arrow

• question_answer7) Drift speed of electrons, when \[1.5\text{ }A\] of current flows in a copper wire of cross section \[5\text{ }m{{m}^{2}}\], is v. If electron density in copper is \[9\times {{10}^{28}}/{{m}^{3}}\] the value of v in mm/s is close to (Take charge of electron to be \[=\text{ }1.6\times {{10}^{-19}}C)\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  0.02     
  done clear
  B)
  0.2
  done clear
  C)
  3                     
  done clear
  D)
       2
  done clear
  View Answer play_arrow

• question_answer8) A plane electromagnetic wave of frequency 50 MHz travels in free space along the positive x-direction. At a particular point in space and time, \[\overrightarrow{E}=6.3\text{ }\overrightarrow{j}\text{ }V/m\]. The corresponding magnetic field B, at that point will be [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[18.9\times {{10}^{-8}}\text{ }\widehat{k}T\]
  done clear
  B)
  \[2.1\times {{10}^{-8}}\text{ }\widehat{k}T\]
  done clear
  C)
  \[18.9\times {{10}^{8}}\text{ }\widehat{k}T\]   
  done clear
  D)
  \[6.3\times {{10}^{-8}}\text{ }\widehat{k}T\]
  done clear
  View Answer play_arrow

• question_answer9) A gas can be taken from A to B via two different processes ACB and ADB. When path ACB is used 60 J of heat flows into the system and 30 J of work is done by the system. If path ADB is used work done by the system is 10 J. The heat Flow into the system in path ADB is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  40 J
  done clear
  B)
  20 J
  done clear
  C)
  100 J           
  done clear
  D)
  80 J
  done clear
  View Answer play_arrow

• question_answer10) A parallel plate capacitor is made of two square plates of side ?a?, separated by a distance\[d\left( d< [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{K{{\in }_{0}}{{a}^{2}}}{2d\,(K+1)}\]
  done clear
  B)
  \[\frac{K{{\in }_{0}}{{a}^{2}}}{d\,(K-1)}\,\,In\,\,K\]
  done clear
  C)
  \[\frac{K{{\in }_{0}}{{a}^{2}}}{d}\,\,In\,\,K\]
  done clear
  D)
  \[\frac{1}{2}\,\,\,\frac{K{{\in }_{0}}{{a}^{2}}}{d}\]
  done clear
  View Answer play_arrow

• question_answer11) Surface of certain metal is first illuminated with light of wavelength \[{{\lambda }_{1}}=350\,nm\] nm and then, by light of wavelength \[{{\lambda }_{2}}=540nm\]. It is found that the maximum speed of the photo electrons in the two cases differ by a factor of 2. The work function of the metal (in eV) is close to : (Energy of photon \[=\frac{1240}{\lambda \,(in\,\,nm)}\,e\,V)\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  5.6          
  done clear
  B)
  2.5
  done clear
  C)
  1.8                
  done clear
  D)
  1.4
  done clear
  View Answer play_arrow

• question_answer12) An infinitely long current carrying wire and a small current carrying loop are in the plane of the paper as shown. The radius of the loop is a and distance of its centre from the wire is \[d\left( d>>a \right)\]. If the loop applies a force F on the wire then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[F\propto \left( \frac{{{a}^{2}}}{{{d}^{3}}} \right)\]
  done clear
  B)
  \[F\propto \left( \frac{a}{d} \right)\]
  done clear
  C)
  \[F\,\,=\,\,0\]               
  done clear
  D)
  \[F\propto {{\left( \frac{a}{d} \right)}^{2}}\]
  done clear
  View Answer play_arrow

• question_answer13) A heavy ball the mass M is suspended from the ceiling of a car by a right string of mass m \[\left( m<<M \right)\]. When the car is at rest, the speed of transverse waves in the string is\[60\text{ }m{{s}^{-1}}\]. When the car has acceleration a, the wave-speed increases to\[60.5\text{ }m{{s}^{-1}}\]. The value of a, in terms of gravitational acceleration g, is closest to:
  A)
  \[\frac{g}{20}\]
  done clear
  B)
  \[\frac{g}{5}\]    
  done clear
  C)
  \[\frac{g}{10}\]
  done clear
  D)
  \[\frac{g}{30}\]
  done clear
  View Answer play_arrow

• question_answer14) When the switch S, in circuit shown, is closed, then the value of current i will be:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  4 A   
  done clear
  B)
  5 A   
  done clear
  C)
  3 A   
  done clear
  D)
  2 A
  done clear
  View Answer play_arrow

• question_answer15) A current loop, having two circular arcs joined by two radial lines y shown in the figure. It carries a current of 10 A. The magnetic field at point 0 will be close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[~1.5\,\,\times \,\,\text{1}{{0}^{-5}}\,T\]     
  done clear
  B)
  \[1.0\times {{10}^{-\,5}}\,T\]
  done clear
  C)
  \[1.5\,\,\times \,\,{{10}^{-7}}\,T~\]  
  done clear
  D)
  \[1.0\times \text{1}{{0}^{-7}}\,T\]
  done clear
  View Answer play_arrow

• question_answer16) Mobility of electrons in a semiconductor is defined as the ratio of their drift velocity to the applied electric field. If, for an n-type semiconductor, the density of electrons is \[{{10}^{19}}{{m}^{-3}}\] and their mobility is \[1.6\text{ }{{m}^{2}}/\left( V.s \right)\] then the resistivity of the semiconductor (since it is an n-type semiconductor contribution of holes is ignored) is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[0.4\text{ }\Omega \,m\]           
  done clear
  B)
  \[2\text{ }\Omega \,m\]
  done clear
  C)
  \[4\,\,\Omega \,m\]  
  done clear
  D)
  \[0.2\,\,\Omega \,m\]
  done clear
  View Answer play_arrow

• question_answer17) Consider a tank made of glass (refractive index 1.5) with s. thick bottom. It is filled with a liquid of refractive index \[\mu \]. A student finds that, irrespective of what the incident angle I (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of \[\mu \] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\sqrt{\frac{5}{3}}\]
  done clear
  B)
  \[\frac{4}{3}\]
  done clear
  C)
  \[\frac{5}{\sqrt{3}}\]
  done clear
  D)
  \[\frac{3}{\sqrt{5}}\]
  done clear
  View Answer play_arrow

• question_answer18) If the angular momentum of a planet of mass m, moving around the Sun in a circular orbit is L, about the center of the Sun, its areal velocity is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{L}{m}\]                 
  done clear
  B)
  \[\frac{L}{2m}\]
  done clear
  C)
  \[\frac{4L}{m}\]
  done clear
  D)
  \[\frac{2L}{m}\]
  done clear
  View Answer play_arrow

• question_answer19) A block of mass 10 kg is kept on a rough inclined plane as shown in the figure. A force of 3 N is applied on the block. The coefficient of static friction between the plane and the block is 0.6. What should be the minimum value of force P, such that the block does not move downward? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  32 N            
  done clear
  B)
  25 N
  done clear
  C)
  23 N            
  done clear
  D)
  18 N
  done clear
  View Answer play_arrow

• question_answer20) A rod, of length L at room temperature and uniform area of cross section A, is made of a metal having coefficient of linear expansion \[a/{}^\circ C\]. It is observed that an external compressive force F, is applied on each of its ends, prevents any change in the length of the rod, when its temperature rises by \[\Delta \] TK. Young?s modulus, Y, for this metal is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{F}{A\alpha \Delta T}\]
  done clear
  B)
  \[\frac{F}{2A\alpha \Delta T}\]
  done clear
  C)
  \[\frac{2\,F}{A\alpha \Delta T}\]
  done clear
  D)
  \[\frac{\,F}{A\alpha (\Delta T-273)}\]
  done clear
  View Answer play_arrow

• question_answer21) A particle is moving with a velocity \[\overrightarrow{v}=K\left( y\,\,\overrightarrow{i}+x\,\,\overrightarrow{j} \right)\], where K is a constant. The general equation for its path is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[y={{x}^{2}}+constant\]
  done clear
  B)
  \[{{y}^{2}}=\text{ }{{x}^{2}}+constant\]
  done clear
  C)
  \[{{y}^{2}}=\,\,x+constant\]
  done clear
  D)
  \[xy\text{ }=\text{ }constant\]
  done clear
  View Answer play_arrow

• question_answer22) A conducting circular loop made of a thin wire, has area \[3.5\,\,\times \,\,{{10}^{-3}}\,{{m}^{2}}\] and resistance 100. It is placed perpendicular to a time dependent magnetic field\[B\left( t \right)=\left( 0.4T \right)sin\left( 50\pi t \right)\]. The field is uniform in space. Then the net charge flowing through the loop during \[t\,\,=\,\,0\] s and \[t\,\,=\,\,0\] ms is close to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  6 mC
  done clear
  B)
  14 mC
  done clear
  C)
  7 mC
  done clear
  D)
  21 mC
  done clear
  E)
  None of These
  done clear
  View Answer play_arrow

• question_answer23) An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If \[\,AB=BC\], and the angle made by AB with downward vertical is \[\theta \], then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\tan \,\theta \,\,=\,\,\frac{1}{3}\]       
  done clear
  B)
  \[\tan \,\theta \,\,=\,\,\frac{1}{2}\]
  done clear
  C)
  \[\tan \,\theta \,\,=\,\,\frac{2}{\sqrt{3}}\]     
  done clear
  D)
  \[\tan \,\theta \,\,=\,\,\frac{1}{2\sqrt{3}}\]
  done clear
  View Answer play_arrow

• question_answer24) A copper wire is stretcher! to make it \[0.5\,%\] longer. The percentage change m in its electrical resistance if its volume remain unchanged is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[0.5\text{ }%\]             
  done clear
  B)
  \[2.5\text{ }%\]
  done clear
  C)
  \[2.0\text{ }%\]             
  done clear
  D)
  \[1.0\text{ }%\]
  done clear
  View Answer play_arrow

• question_answer25) Three charges +Q, q, +Q are placed respectively, at distance, 0, \[d/2\] and d from the origin, on the x-axis. If the net force experienced \[by+Q\], placed at \[x=0\], is zero then value of q is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  +Q/2           
  done clear
  B)
  -Q/4
  done clear
  C)
  +Q/4           
  done clear
  D)
  -Q/2
  done clear
  View Answer play_arrow

• question_answer26) A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2 m, 100 turns, and carrying a current of 5.2 A. The coercivity of the bar magnet is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  2600 A/m      
  done clear
  B)
  1200 A/m
  done clear
  C)
  520 A/m       
  done clear
  D)
  285 A/m
  done clear
  View Answer play_arrow

• question_answer27) A resistance is shown in the figure. Its value and tolerance are given respectively by:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[270\text{ }\Omega ,\text{ }10\text{ }%\]    
  done clear
  B)
  \[270\text{ }\Omega ,\text{ }5\text{ }%\]
  done clear
  C)
  \[27\text{ }k\Omega ,\text{ }10\,%\]   
  done clear
  D)
  \[27\text{ }k\Omega ,\text{ }20\,%\]
  done clear
  View Answer play_arrow

• question_answer28) A block of mass m, lying on a smooth horizontal surface, is attached to a spring (of negligible mass) of spring constant k. The other end of the spring is fixed, as shown in the figure. The block is initally at rest in its equilibrium position. If now the block is pulled with a constant force F, the maximum speed of the block is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{2F}{\sqrt{mk}}\]
  done clear
  B)
  \[\frac{\pi \,F}{\sqrt{mk}}\]
  done clear
  C)
  \[\frac{F}{\pi \,\sqrt{mk}}\]
  done clear
  D)
  \[\frac{F}{\sqrt{mk}}\]
  done clear
  View Answer play_arrow

• question_answer29) Two masses m and \[\frac{m}{2}\] are connected at the two ends of a massless rigid rod of length l. The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system (see figure). Because of torsional constant k, the restoring torque is \[\tau \,\,=\,\,k\theta \] for angular displacement \[\theta \]. If the rod is rotated by \[{{\theta }_{0}}\] and released, the tension in it when it passes through its mean position will be: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{2\,k\,{{\theta }_{0}}^{2}}{l}\]
  done clear
  B)
  \[\frac{k\,{{\theta }_{0}}^{2}}{l}\]
  done clear
  C)
  \[\frac{3k\,{{\theta }_{0}}^{2}}{l}\]
  done clear
  D)
  \[\frac{k\,{{\theta }_{0}}^{2}}{2\,l}\]
  done clear
  View Answer play_arrow

• question_answer30)   Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is given an initial speed v towards B due to which it collides with B perfectly inelastically \[\frac{5}{6}th\] of the initial kinetic energy is lost in whole process. What is value of M/m?   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  2                  
  done clear
  B)
  3
  done clear
  C)
  5                  
  done clear
  D)
  4
  done clear
  View Answer play_arrow

• question_answer31) In general the properties that decrease and increase down a group in the periodic table, respectively, are- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  electronegativity, and atomic radius.
  done clear
  B)
  electronegativity and electron gain enthalpy.
  done clear
  C)
  atomic radius and electronegativity.
  done clear
  D)
  electron gain enthalpy and electronegativity.
  done clear
  View Answer play_arrow

• question_answer32) The major product of following reaction is: \[R-C\equiv N\,\,\xrightarrow[(2)\,\,{{H}_{2}}O]{(1)\,\,AlH\,{{(i-Bu)}_{2}}}\,\,?\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  RCHO
  done clear
  B)
  RCOOH
  done clear
  C)
  \[RCON{{H}_{2}}\]
  done clear
  D)
  \[RC{{H}_{2}}N{{H}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer33) Which amongst the following is the strongest acid? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[CHB{{r}_{3}}~\]
  done clear
  B)
  \[CHC{{l}_{3}}\]
  done clear
  C)
  \[CH{{\left( CN \right)}_{3}}\]
  done clear
  D)
  \[CH{{I}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer34) Arrange the following amines in the decreasing order of basicity:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[I>III>II\]    
  done clear
  B)
  \[III>I>II\]
  done clear
  C)
  \[I>II>III\]
  done clear
  D)
  \[III>II>I\]
  done clear
  View Answer play_arrow

• question_answer35) The ore that contains both iron and copper is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  dolomite
  done clear
  B)
  malachite
  done clear
  C)
  copper pyrites 
  done clear
  D)
  azurite
  done clear
  View Answer play_arrow

• question_answer36) The anodic half-cell of lead-acid battery is recharged using electricity of 0.05 Faraday. The amount of \[PbS{{O}_{4}}\] electrolyzed in g during the process is: (Molar mass of \[PbS{{O}_{4}}-=303\text{ }g\text{ }mo{{l}^{-1}}\]) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  15.2            
  done clear
  B)
  7.6
  done clear
  C)
  11.4            
  done clear
  D)
  22.8
  done clear
  View Answer play_arrow

• question_answer37) Correct statements among a to d regarding silicones are - (a) They are polymers with hydrophobic character. (b) They are biocompatible. (c) In general, they have high thermal stability and low dielectric strength. (d) Usually, they are resistant to oxidation and used as greases. [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  (a), (b) and (d) only
  done clear
  B)
  (a), (b) and (c) only
  done clear
  C)
  (a), (b), (c) and (d)
  done clear
  D)
  (a) and (b) only
  done clear
  View Answer play_arrow

• question_answer38) The following results were obtained during kinetic studies of the reaction: \[2A\,\,+\,\,B\,\,\to \] Products

  Experi-ment	in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\]	(in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\]	Initial Rate of reaction (in \[\mathbf{mol}\text{ }{{\mathbf{L}}^{-\mathbf{1}}}\] \[\mathbf{mi}{{\mathbf{n}}^{\mathbf{-1}}}\])
  I	0.10	0.20	\[6.93\,\,\times \,\,{{10}^{-3}}\]
  II	0.10	0.25	\[6.93\,\,\times \,\,{{10}^{-3}}\]
  III	0.20	0.30	\[1.386\,\,\times \,\,{{10}^{-2}}\]

  The time (in minutes) required to consume half of A is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  5                 
  done clear
  B)
  1
  done clear
  C)
  100             
  done clear
  D)
  10
  done clear
  View Answer play_arrow

• question_answer39) The major product of the following reaction is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  
  done clear
  B)
  
  done clear
  C)
  
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer40) The one that is extensively used as a piezoelectric material is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  mica
  done clear
  B)
            quartz
  done clear
  C)
  amorphous silica
  done clear
  D)
  tridymite
  done clear
  View Answer play_arrow

• question_answer41) 0.5 moles of gas A and x moles of gas B exert a pressure of 200 Pa in a container of volume \[10\text{ }{{m}^{3}}\] at 1000 K. Given R is the gas constant in \[J{{K}^{-1}}\,\,mo{{l}^{-1}}\], x is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{2R}{4-R}\]
  done clear
  B)
  \[\frac{4+R}{2R}\]
  done clear
  C)
  \[\frac{4-R}{2R}\]
  done clear
  D)
  \[\frac{2R}{4+R}\]
  done clear
  View Answer play_arrow

• question_answer42) For emission line of atomic hydrogen from \[{{n}_{1}}=8\] to \[{{n}_{f}}=n\], the plot of wave number \[\left( \overline{v} \right)\] against \[\left( \frac{1}{{{n}^{2}}} \right)\] will be (The Rydberg constant, \[{{R}_{H}}\] is wave number unit) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  Linear with slope - \[{{R}_{H}}\]
  done clear
  B)
  Linear with slope -\[{{R}_{H}}\]
  done clear
  C)
  Non linear
  done clear
  D)
  Linear with intercept - \[{{R}_{H}}\]
  done clear
  View Answer play_arrow

• question_answer43) Major product of the following reaction is:   [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
   
  done clear
  B)
   
  done clear
  C)
   
  done clear
  D)
   
  done clear
  View Answer play_arrow

• question_answer44) The correct decreasing order for acid strength is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[N{{O}_{2}}C{{H}_{2}}COOH\text{ }>\text{ }FC{{H}_{2}}COOH\text{ }>CNC{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]
  done clear
  B)
  \[CNC{{H}_{2}}COOH>{{O}_{2}}NC{{H}_{2}}COOH\text{ }>FC{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]
  done clear
  C)
  \[FC{{H}_{2}}COOH>ClC{{H}_{2}}COOH>N{{O}_{2}}C{{H}_{2}}COOH\text{ }>\text{ }ClC{{H}_{2}}COOH\]
  done clear
  D)
  \[N{{O}_{2}}C{{H}_{2}}COOH>NCC{{H}_{2}}COOH>FC{{H}_{2}}COOH>ClC{{H}_{2}}COOH\]
  done clear
  View Answer play_arrow

• question_answer45) 20 mL of 0.1 M \[{{H}_{2}}S{{O}_{4}}\] solution is added to 30 mL of 0.2 M \[N{{H}_{4}}OH\] solution. The pH of the resultant mixture is: \[[p{{K}_{b}}\text{ }of\text{ }N{{H}_{4}}OH\,\,=\,\,4.7]\]. [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  5.2
  done clear
  B)
  9.4
  done clear
  C)
  9.0
  done clear
  D)
  5.0
  done clear
  View Answer play_arrow

• question_answer46) The alkaline earth metal nitrate that does not crystallize with water molecules, is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[Ba{{\left( N{{O}_{3}} \right)}_{2}}\]
  done clear
  B)
  \[Mg{{\left( N{{O}_{3}} \right)}_{2}}\]
  done clear
  C)
  \[Ca{{\left( N{{O}_{3}} \right)}_{2}}\]
  done clear
  D)
  \[Sr{{\left( N{{O}_{3}} \right)}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer47) Consider   the   reversible   isothermal expansion of an ideal gas in a closed system at two different temperatures T1 and \[{{T}_{2}}\left( {{T}_{1}}<\text{ }{{T}_{2}} \right)\]. The correct graphical depiction of the dependence of work done (W) on the final volume (V) is - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
   
  done clear
  B)
  
  done clear
  C)
   
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer48) Adsorption of a gas follows Freundlich adsorption isotherm. IN the given plot, x is the mass of the gas adsorbed on mass m of the adsorbent at pressure P. \[\frac{x}{m}\] is proportional to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  P
  done clear
  B)
  \[{{P}^{1/2}}\]
  done clear
  C)
  \[{{P}^{2}}\]
  done clear
  D)
  \[{{P}^{1/4}}\]
  done clear
  View Answer play_arrow

• question_answer49) The increasing order of pKa of the following ammo acids in aqueous solution is: Gly Asp Lys Arg [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[Asp<Gly<Lys<Arg\]
  done clear
  B)
  \[Arg<Lys<Gly<Asp\]
  done clear
  C)
  \[Gly<Asp<Arg<Lys\]
  done clear
  D)
  \[Asp<Gly<Arg<Lys\]
  done clear
  View Answer play_arrow

• question_answer50) According to molecular orbital theory, which of the following is true with respect to\[{{L}_{i2}}+and\text{ }{{L}_{i2}}-\]? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  Both are unstable
  done clear
  B)
  Both are stable
  done clear
  C)
  \[{{L}_{i2}}+\] is stable and \[{{L}_{i2}}-\] is unstable
  done clear
  D)
  \[{{L}_{i{{2}^{+}}}}\]is unstable and \[{{L}_{i2}}-\] is stable
  done clear
  View Answer play_arrow

• question_answer51) A water sample has ppm level \[Fe=0.2\]; \[Mn=5.0\] ; \[Cu=3.0\] ; \[Zn=5.0\] The metal that makes the water sample unsuitable for drinking is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  Zn             
  done clear
  B)
  Fe                 
  done clear
  C)
  Cu             
  done clear
  D)
  Mn
  done clear
  View Answer play_arrow

• question_answer52) Two complexes \[\left[ Cr{{\left( {{H}_{2}}0 \right)}_{6}} \right]C{{l}_{3}}\] and \[\left[ Cr{{\left( N{{H}_{3}} \right)}_{6}} \right]C{{l}_{3}}\] are violet and yellow coloured, respectively. The  incorrect statement regarding, them is- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[{{\Delta }_{0}}\] value for is less than that of (B).
  done clear
  B)
  both absorb energies corresponding to their complementary colors.
  done clear
  C)
  \[{{\Delta }_{0}}\] values of and are calculated. From the energies of violet and yellow light, respectively.
  done clear
  D)
  both are paramagnetic with three unpaired electrons.
  done clear
  View Answer play_arrow

• question_answer53) The major product of the following reaction is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  
  done clear
  B)
  
  done clear
  C)
   
  done clear
  D)
  
  done clear
  View Answer play_arrow

• question_answer54) Which one of the following statements regarding Henery's law is not correct? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  Different gases have different \[{{K}_{H}}\] (Henry's law constant) values at the same temperature.
  done clear
  B)
  The partial pressure of the gas in vapour phase is proportional to the mole fraction of the gas in the solution.
  done clear
  C)
  The value of \[{{K}_{H}}\] increases with increase of temperature and \[{{K}_{H}}\] is function of the nature of the gas.
  done clear
  D)
  Higher the value of \[{{K}_{H}}\] at a given pressure, higher is the solubility of the gas in the liquids.
  done clear
  View Answer play_arrow

• question_answer55) The compound A and B in the following reaction are respectively: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  A = Benzyl alcohol, B = Benzyl cyanide
  done clear
  B)
  A = Benzyl chloride, B = Benzyl cyanide
  done clear
  C)
  A = Benzyl alcohol, B = Benzyl isocyanide
  done clear
  D)
  A = Benzyl chloride, B = Benzyl isocyanide
  done clear
  View Answer play_arrow

• question_answer56) The highest value of the calculated spin only magnetic moment (in BM) among all the transition metal complexes is- [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  6.93
  done clear
  B)
  5.92
  done clear
  C)
  4.90
  done clear
  D)
  3.87
  done clear
  View Answer play_arrow

• question_answer57) A solution of sodium sulfate contains \[92\text{ }g\text{ }of\text{ }N{{a}^{+}}\] ions per kilogram of water. The molality of \[N{{a}^{+}}\] ions in that solution in \[mol\text{ }k{{g}^{-1}}\] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  8
  done clear
  B)
  4
  done clear
  C)
  12
  done clear
  D)
  16
  done clear
  View Answer play_arrow

• question_answer58) The correct match between Item-I am Item-II is:

  Item-I (drug)		Item-II (test)
  (A)	Chlorozylenol	(P)	Carbolamine test
  (B)	Norethindrone	(Q)	Sodium hydrogen carbonate test
  (C)	Sulphapyridine	(R)	Ferric chlorine test
  (D)	Penicillin	(S)	Bayer's test

    [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[A\to R;\,\,\,B\to S;\,\,\,C\to P;\,\,\,D\to Q\]
  done clear
  B)
  \[A\to Q;\,\,\,B\to P;\,\,\,C\to S;\,\,\,D\to R\]
  done clear
  C)
  \[A\to Q;\,\,\,B\to S;\,\,\,C\to P;\,\,\,D\to R\]
  done clear
  D)
  \[A\to R;\,\,\,B\to P;\,\,\,C\to S;\,\,\,D\to Q\]
  done clear
  View Answer play_arrow

• question_answer59) The isotopes of hydrogen are: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  Protium and deuterium only
  done clear
  B)
  Protium, deuterium and tritium
  done clear
  C)
  Deuterium and tritium only
  done clear
  D)
  Tritium and protium only
  done clear
  View Answer play_arrow

• question_answer60) Aluminium is usually found in +3 oxidation state. In contrast, thallium exists in +1 and + 3 oxidation states. This is due to - [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  diagonal relationship
  done clear
  B)
  lanthanoid contraction
  done clear
  C)
  inert pair effect
  done clear
  D)
  lattice effect
  done clear
  View Answer play_arrow

• question_answer61) \[\underset{y\to 0}{\mathop{\lim }}\,\frac{\sqrt{1+\sqrt{1+{{y}^{4}}}}-\sqrt{2}}{{{y}^{4}}}\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  exists and equals \[\frac{1}{2\sqrt{2}}\]
  done clear
  B)
  exists and equals \[\frac{1}{4\sqrt{2}}\]
  done clear
  C)
  exists and equals \[\frac{1}{2\sqrt{2}(\sqrt{2}+1)}\]
  done clear
  D)
  does not exist
  done clear
  View Answer play_arrow

• question_answer62) If a, b and c be three distinct real numbers in G.P. and \[a+b+c=xb\], then x cannot be: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  -2
  done clear
  B)
  2
  done clear
  C)
  -3
  done clear
  D)
  4
  done clear
  View Answer play_arrow

• question_answer63) The maximum volume (in cu. m) of the right circular cone having slant height 3 m is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[6\pi \]
  done clear
  B)
  \[\frac{4}{3}\pi \]
  done clear
  C)
  \[2\sqrt{3}\,\pi \]
  done clear
  D)
  \[3\sqrt{3}\,\pi \]
  done clear
  View Answer play_arrow

• question_answer64) 

  The system of linear equations

  \[x+y+z=2\]

  \[2x+3y+2z=\text{ }5\]

  \[2x+3y+\left( {{a}^{2}}-1 \right)z\text{ }=\text{ }a+1\]

  [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  has infinitely many solutions for \[a=4\]
  done clear
  B)
  has a unique solution for I a I \[=\,\,\sqrt{3}\]
  done clear
  C)
  is inconsistent when I a I = \[=\,\,\sqrt{3}\]
  done clear
  D)
  is inconsistent when \[a=4\]
  done clear
  View Answer play_arrow

• question_answer65) Let \[f:\,\,R\to R\] be a function defined as Then, f is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  continuous if \[a=0\] and \[b=5\]
  done clear
  B)
  continuous if \[a=-5\] and \[b=10\]
  done clear
  C)
  continuous if \[a=5\] and \[b=5\]
  done clear
  D)
  not continuous for any values of a and b
  done clear
  View Answer play_arrow

• question_answer66) Axis of a parabola lies along x-axis. If its vertex and focus are at distance 2 and 4 respectively from the origin, on the positive x-axis then which of the following points does not lie on it? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\left( 8,\text{ }6 \right)\]
  done clear
  B)
  \[\left( 4,\,-4 \right)\]
  done clear
  C)
  \[(6,\,\,4\sqrt{2})\]
  done clear
  D)
  \[(5,\,\,2\sqrt{6})\]
  done clear
  View Answer play_arrow

• question_answer67) Let \[\alpha \text{ }and\text{ }\beta \] be two roots of the equation \[{{x}^{2}}+2x+2=0\], then \[{{\alpha }^{15}}+{{\beta }^{15}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  -256
  done clear
  B)
  512
  done clear
  C)
  -512
  done clear
  D)
  256  
  done clear
  View Answer play_arrow

• question_answer68) If the Boolean express. \[(p\oplus q)\,\,\wedge (\sim p\,\odot q)\] is equivalent to \[p\wedge q\], where \[\oplus ,\,\,\odot \,\,\in \{\wedge ,\,\,\vee \},\]then the ordered pair \[(\oplus ,\,\,\odot )\] is [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[(\vee ,\,\,\,\vee )\]
  done clear
  B)
  \[(\wedge ,\,\,\,\wedge )\]
  done clear
  C)
  \[(\wedge ,\,\,\,\vee )\]
  done clear
  D)
  \[(\vee ,\,\,\,\wedge )\]
  done clear
  View Answer play_arrow

• question_answer69) Let \[\overrightarrow{a}=\widehat{i}-\widehat{\text{j}}\,,\,\,\,\overrightarrow{b}=\widehat{i}+\widehat{j}+\widehat{k}\,\,\,and\,\,\overrightarrow{c}\,\] and be a vector such that \[\overrightarrow{a}\,\,\times \,\,\overrightarrow{c}\,\,+\,\,\overrightarrow{b}\,\,=\,\,\overrightarrow{0}\] and \[\overrightarrow{a}\text{ }.\text{ }\overrightarrow{c}\text{ }=4\], then \[{{\overrightarrow{\left| \,c\, \right|}}^{2}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{19}{2}\]
  done clear
  B)
  8
  done clear
  C)
  \[\frac{17}{2}\]
  done clear
  D)
  9
  done clear
  View Answer play_arrow

• question_answer70) 5 students of a class have an average height 150 cm and variance \[18\text{ }c{{m}^{2}}\]. A new student, whose height is 156 cm, joined them. The variance (in \[c{{m}^{2}}\]) of the height of these six students is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  20
  done clear
  B)
  18
  done clear
  C)
  16
  done clear
  D)
  22
  done clear
  View Answer play_arrow

• question_answer71) For \[x\in R\text{ }-\left\{ 0,\text{ }1 \right\},\text{ }let\text{ }{{f}_{1}}\left( x \right)\,\,=\,\,\frac{1}{x}\,\,,\text{ }{{f}_{2}}\left( x \right)=1-x\] and \[{{f}_{3}}\left( x \right)=\frac{1}{1-x}\] be three given functions.  If a function, J(x) satisfies \[\left( fz\circ \text{ }J\circ \,\,{{f}_{1}} \right)\left( x \right)=\text{ }{{f}_{3}}\text{ }\left( x \right)\] then J(x) is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{1}{x}{{f}_{3}}\,(x)\]
  done clear
  B)
  \[{{f}_{2}}\,(x)\]
  done clear
  C)
  \[{{f}_{3}}\,(x)\]
  done clear
  D)
  \[{{f}_{1}}\,(x)\]
  done clear
  View Answer play_arrow

• question_answer72) Let A= \[\left\{ \theta \in \left( -\frac{\pi }{2},\,\pi  \right):\,\frac{3+2i\,\,\sin \theta }{1-2i\,\,\sin \,\theta }\,is\,\,purely\,\,imaginary \right\}.\] Then the sum of the elements in A is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{5\pi }{6}\]
  done clear
  B)
  \[\frac{3\pi }{4}\]
  done clear
  C)
  \[\frac{2\pi }{3}\]
  done clear
  D)
  \[\pi \]
  done clear
  View Answer play_arrow

• question_answer73) Consider a class of 5 girls and 7 boys. The number of different teams consisting of 2 girls and 3 boys that can be formed from this class, if there are two specific boys A and B, who refuse to be the members of the same team, is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  300            
  done clear
  B)
  500
  done clear
  C)
  200
  done clear
  D)
  350
  done clear
  View Answer play_arrow

• question_answer74) For any \[\theta \,\,\,\,\in \,\,\,\,\left( \frac{\pi }{4},\,\,\frac{\pi }{2} \right)\], the expression \[3{{\left( sin\,\theta -cos\,\theta  \right)}^{4}}+6{{\left( sin\,\theta +cos\,\theta  \right)}^{2}}+4\,si{{n}^{6}}\theta \]equals: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[13-4\,co{{s}^{4}}\theta +2\,si{{n}^{2}}\theta \,co{{s}^{2}}\theta \]
  done clear
  B)
  \[13-4\,co{{s}^{2}}\theta +6\,si{{n}^{2}}\theta \,co{{s}^{2}}\theta \]
  done clear
  C)
  \[13-4\text{ }cos{{\,}^{2}}\,\theta +6\,\,co{{s}^{4}}\,\theta \]
  done clear
  D)
  \[13-4\text{ }cos{{\,}^{6}}\,\theta \]
  done clear
  View Answer play_arrow

• question_answer75) Equation of a common tangent to the circle \[{{x}^{2}}+{{y}^{2}}-6x=0\] and the parabola, \[{{y}^{2}}=4x\], is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\sqrt{3}y=x+3\]     
  done clear
  B)
  \[\sqrt{3}y=3x+3\]
  done clear
  C)
  \[2\sqrt{3}y=\,\,-x-12\]
  done clear
  D)
  \[2\sqrt{3}\,y=12x+1\]
  done clear
  View Answer play_arrow

• question_answer76) Let \[{{a}_{1}},\text{ }{{a}_{2}},\text{ }.......,\text{ }{{a}_{30}}\] be an A.P., \[S=\sum\limits_{i\,=\,1}^{30}{{{a}_{i}}}\,\,and\,\,T\,\,=\,\,\sum\limits_{i\,=\,1}^{15}{{{a}_{(2i-1)}}}\]If \[{{a}_{5}}=27\] and \[S-2T=75\], then \[{{a}_{10}}\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  47   
  done clear
  B)
  42    
  done clear
  C)
  52    
  done clear
  D)
  57
  done clear
  View Answer play_arrow

• question_answer77) For \[{{x}^{2}}\ne n\pi \,+\,1,\,\,n\in N\] (the set of natural numbers), the integral \[\int{x\,\,\frac{2\,\sin \,({{x}^{2}}-1)\,\,-\,\sin 2\,({{x}^{2}}-1)}{2\,\sin \,({{x}^{2}}-1)+sin\,2({{x}^{2}}-1)}}\,dx\] is equal to: (where c is a constant of integration) [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[{{\log }_{e}}\,\left| \sec \,\left( \frac{{{x}^{2}}-1}{2} \right) \right|\,\,+c\]
  done clear
  B)
  \[{{\log }_{e}}\,\left| \frac{1}{2}{{\sec }^{2}}\,({{x}^{2}}-1) \right|\,\,+c\]
  done clear
  C)
  \[\frac{1}{2}\,{{\log }_{e}}\,\left| {{\sec }^{2}}\,\left( \frac{{{x}^{2}}-1}{2} \right) \right|\,\,+c\]
  done clear
  D)
  \[\frac{1}{2}\,{{\log }_{e}}\,\left| \sec ({{x}^{2}}-1) \right|\,\,+\,\,c\]
  done clear
  View Answer play_arrow

• question_answer78) Three circles of radii a, b, c (a < b < c) touch each other externally. If they have x-axis as a  common tangent, then: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{1}{\sqrt{b}}\,\,=\,\,\frac{1}{\sqrt{a}}+\frac{1}{\sqrt{c}}\,\]
  done clear
  B)
  a, b, c are in A. P.
  done clear
  C)
  \[\sqrt{a},\,\,\sqrt{b},\,\,\sqrt{c}\,\,are\,\,in\,\,A.P.\]
  done clear
  D)
  \[\frac{1}{\sqrt{a}}=\frac{1}{\sqrt{b}}+\frac{1}{\sqrt{c}}\]   
  done clear
  View Answer play_arrow

• question_answer79) If \[A\,\,=\,\,\left[ \begin{align}  & \cos \,\theta \,\,\,\,\,\,-\sin \theta  \\  & \sin \,\theta \,\,\,\,\,\,\,\,\,\,\,\cos \,\theta  \\ \end{align} \right]\] then matrix \[{{A}^{-50}}\] when \[\theta =\frac{\pi }{12}\], is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\left| \begin{align}   & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\  & -\frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\frac{1}{2} \\ \end{align} \right|\]
  done clear
  B)
  \[\left| \begin{align}   & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,-\,\frac{\sqrt{3}}{2} \\  & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{2} \\ \end{align} \right|\]
  done clear
  C)
  \[\left| \begin{align}   & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{1}{2}\,\,\, \\  & -\frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\ \end{align} \right|\]
  done clear
  D)
  \[\left| \begin{align}   & \frac{\sqrt{3}}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\frac{1}{2}\,\,\, \\  & \frac{1}{2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\frac{\sqrt{3}}{2} \\ \end{align} \right|\]
  done clear
  View Answer play_arrow

• question_answer80) If \[\cos {{\,}^{-1}}\,\left( \frac{2}{3x} \right)\,\,+\,\,\cos {{\,}^{-1}}\,\left( \frac{3}{4x} \right)\,=\,\frac{\pi }{2}\,\,\left( x>\frac{3}{4} \right)\,\] then x is equal to [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{\sqrt{145}}{10}\]
  done clear
  B)
  \[\frac{\sqrt{145}}{11}\]
  done clear
  C)
  \[\frac{\sqrt{145}}{12}\]
  done clear
  D)
  \[\frac{\sqrt{146}}{12}\]
  done clear
  View Answer play_arrow

• question_answer81) If the fractional part of the number \[\frac{{{2}^{\,403}}}{15}\] is \[\frac{k}{15}\], then k is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  8     
  done clear
  B)
  14    
  done clear
  C)
  6     
  done clear
  D)
  4
  done clear
  View Answer play_arrow

• question_answer82) Consider the set of all lines \[px+qy+r=0\] such that \[3p+2q+4r=0\]. Which one of the following statements is true? [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  The lines are not concurrent
  done clear
  B)
  The lines are concurrent at the point\[\left( \frac{3}{4},\,\,\frac{1}{2} \right)\]
  done clear
  C)
  The lines are all parallel
  done clear
  D)
  Each line passes through the origin
  done clear
  View Answer play_arrow

• question_answer83) Two cards are drawn successively with replacement from a well-shuffled deck of 52 cards. Let X denote the random variable of number of aces obtained in the two drawn cards. Then \[P\left( X=1 \right)+P\left( X=2 \right)\] equals:  [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  25/169
  done clear
  B)
  24/169
  done clear
  C)
  49/169
  done clear
  D)
  52/169
  done clear
  View Answer play_arrow

• question_answer84) The equation of the line passing through \[\left( -4,\text{ }3,\text{ }1 \right)\], parallel to the plane \[x+2y-z-5=0\] and intersecting the line\[\frac{x+1}{-3}\,\,\,=\,\,\,\frac{y-3}{2}\,\,=\,\,\frac{z-2}{-1}\] [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{x+4}{3}\,\,\,=\,\,\,\frac{y-3}{-1}\,\,=\,\,\frac{z-1}{1}\]
  done clear
  B)
  \[\frac{x+4}{1}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z-1}{3}\]
  done clear
  C)
  \[\frac{x+4}{-1}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z-1}{1}\]
  done clear
  D)
  \[\frac{x-4}{2}\,\,\,=\,\,\,\frac{y-3}{1}\,\,=\,\,\frac{z+1}{4}\]
  done clear
  View Answer play_arrow

• question_answer85)   The plane through the intersection of the planes \[x+y+z=1\text{ }and\text{ }2x+3y-z+4=0\] and parallel to y-axis also passes through the point: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  (- 3, 1, 1)        
  done clear
  B)
  (-3, 0, -1)
  done clear
  C)
  (3, 3, -1)         
  done clear
  D)
  (3, 2, 1)
  done clear
  View Answer play_arrow

• question_answer86) If \[\theta \] denotes the acute angle between the curves, \[y=10-{{x}^{2}}\] and \[y=2+{{x}^{2}}\] at a point of their intersection, then \[\left| \tan \,\,\theta  \right|\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{4}{9}\]
  done clear
  B)
  \[\frac{7}{17}\]
  done clear
  C)
  \[\frac{8}{17}\]
  done clear
  D)
  \[\frac{8}{15}\]
  done clear
  View Answer play_arrow

• question_answer87) The value of \[\int\limits_{0}^{\pi }{{{\left| \cos \,\,x \right|}^{3}}\,\,dx}\] is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[-\frac{4}{3}\]
  done clear
  B)
  0
  done clear
  C)
  \[\frac{4}{3}\]
  done clear
  D)
  \[\frac{2}{3}\]
  done clear
  View Answer play_arrow

• question_answer88) The area (in sq. units) bounded by the parabola \[y={{x}^{2}}-1\], the tangent at the point (2, 3) to it and the y-axis is: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{56}{3}\]
  done clear
  B)
  \[\frac{32}{3}\]
  done clear
  C)
  \[\frac{8}{3}\]
  done clear
  D)
  \[\frac{14}{3}\]
  done clear
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• question_answer89) If \[y=y\left( x \right)\] is the solution of the differential  equation, \[x\frac{dy}{dx}\,\,+\,\,2y\,\,=\,\,{{x}^{2}}\] satisfying \[y\left( 1 \right)=1\],  then \[y\left( \frac{1}{2} \right)\] is equal to: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\frac{7}{64}\]
  done clear
  B)
  \[\frac{49}{16}\]
  done clear
  C)
  \[\frac{1}{4}\]
  done clear
  D)
  \[\frac{13}{16}\]
  done clear
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• question_answer90) Let \[0<\theta <\frac{\pi }{2}\]. If the eccentricity of the hyperbola \[\frac{{{x}^{2}}}{{{\cos }^{2}}\theta }-\frac{{{y}^{2}}}{{{\sin }^{2}}\,\theta }\,\,=\,\,1\] is greater than 2, then the length of its latus rectum   lies in the interval: [JEE Main Online Paper (Held On 09-Jan-2019 Morning]
  A)
  \[\left( 3,\text{ }\infty  \right)\]
  done clear
  B)
  (1, 3/2]
  done clear
  C)
  (3/2, 2]
  done clear
  D)
  (2, 3]
  done clear
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