Balance the following equation. \[Al+{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+{{H}_{2}}\]
A)
\[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+{{H}_{2}}\]
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B)
\[2Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\]
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C)
\[Al+3{{H}_{2}}S{{O}_{4}}\to A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\]
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D)
\[2Al+3{{H}_{2}}S{{O}_{4}}\to 2A{{l}_{2}}{{(S{{O}_{4}})}_{3}}+3{{H}_{2}}\]
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E)
None of these
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pH values of four solutions A, B, C and D are 4, 9, 1, 8 respectively. Put them in sequence according to their nature.
A)
Basic, acidic, basic acidic
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B)
Acidic, basic, basic, acidic
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C)
Acidic, basic, acidic, basic
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D)
Basic, basic, basic, acidic
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E)
None of these
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The most abundant non-metal in earth's crust is:
A)
Oxygen
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B)
Silicon
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C)
Sulphur
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D)
Phosphorus
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E)
None of these
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The electronic configuration of four elements A, B, C and D are as follows: A: 2, 8, 6 B: 2, 8, 8 C: 2, 8, 8, 1 D: 1, 7 Which two elements will combine to form an ionic bond?
A)
A and B
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B)
B and C
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C)
A and D
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D)
C and D
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E)
None of these
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Which one of the following molecules is called Buckminsterfullerene?
A)
\[{{C}_{90}}\]
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B)
\[{{C}_{60}}\]
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C)
\[{{C}_{70}}\]
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D)
\[{{C}_{120}}\]
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E)
None of these
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Which one of the following is an advantage of silviculture?
A)
It increases the area of earth under forests (which is good for the conservation of wildlife)
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B)
It helps in maintaining a perfect water cycle in nature
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C)
It prevents soil erosion
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D)
All of these
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E)
None of these
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Which of the statements is correct about the following reaction? \[ZnO+CO\to Zn+C{{O}_{2}}\]
A)
\[ZnO\]is being oxidized
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B)
\[CO\] is being reduced
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C)
\[C{{O}_{2}}\] is being oxidized
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D)
\[ZnO\] is being reduced
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E)
None of these
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What happens when dilute hydrochloric acid is added to iron filings?
A)
Hydrogen gas and iron chloride are produced
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B)
Chlorine gas and iron hydroxide are produced
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C)
No reaction takes place
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D)
Iron salt and water are produced
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E)
None of these
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Which one of the following statements is incorrect about bleaching powder?
A)
The chemical formula of bleaching powder \[CaOC{{l}_{2}}\]
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B)
Bleaching powder is prepared by passing chlorine gas over dry slaked lime
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C)
Bleaching powder is soluble in cold water
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D)
Bleaching powder is a yellow powder which gives strong smell of sulphur
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E)
None of these
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The atomic number of an element X is 12. What an atom of X must do to attain the nearest inert gas electronic configuration?
A)
The atom must lose one electron
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B)
The atom must gain one electron
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C)
The atom must lose two electrons
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D)
The atom must gain two electrons
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E)
None of these
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Name the hydrocarbon given below.
A)
2-methylbutane
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B)
2-methylpentane
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C)
2, 2-dimethylpropane
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D)
2, 3-methylbutane
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E)
None of these
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A, B and C are the elements of a Dobereiner's triad. If the atomic mass of A is 7 and that of C is 39. What would be the atomic mass of B?
A)
32
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B)
46
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C)
23
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D)
92
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E)
None of these
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Electromagnetic induction is the:
A)
Charging of a body with a positive charge
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B)
Production of current by relative motion between a magnet and a coil
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C)
Rotation of the coil of an electric motor
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D)
Generation of magnetic field due to a current carrying solenoid
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E)
None of these
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Which one of the following properties of magnetic lines of force around a straight conductor is not correct?
A)
The magnetic lines of force are in the form of concentric circles around a straight conducting wire
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B)
The plane of the magnetic lines of force is perpendicular to the straight conductor
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C)
If the direction of the current in the wire is reversed, the direction of magnetic lines of force is also reversed
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D)
The strength of the magnetic field is inversely proportional to the current passing through the conductor
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E)
None of these
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The atoms of an element has electronic configuration 2, 8, 7. To which of the following elements would it be chemically similar?
A)
N
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B)
F
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C)
P
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D)
Ar
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E)
All of these
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Complete digestion of food takes place in which part of the digestive system?
A)
P
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B)
Q
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C)
R
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D)
S
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E)
None of these
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Which one of the following is the main reason that solar energy is not a main source of generating electrical power?
A)
It pollutes the environment
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B)
It is a non-renewable source
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C)
It is very expensive
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D)
It is not available in plenty
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E)
None of these
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The substances which absorb excess neutrons released during the fission reaction in a nuclear reactor are called:
A)
Moderator
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B)
control rods
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C)
Coolants
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D)
heat exchanger
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E)
None of these
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Which one of the following is not an ecosystem?
A)
A desert
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B)
A forest
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C)
A grassland
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D)
A river
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E)
None of these
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On crossing tall plants with dwarf plants Mendel found the ratio of dwarf plants in F generation was:
A)
25%
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B)
50%
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C)
75%
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D)
100%
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E)
None of these
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In which one of the following conditions a virtual, enlarged and erect image will be formed?
A)
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B)
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C)
done
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D)
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E)
None of these
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Element X forms a chloride with the formula \[XC{{l}_{2}}\] which is a solid with high melting point. X would most likely be in the same group of the periodic table as:
A)
Na
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B)
Mg
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C)
Al
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D)
Si
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E)
None of these
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The oxygenated blood is carried from lungs to left auricle by:
A)
Vena cava
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B)
pulmonary vein
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C)
Pulmonary artery
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D)
aorta
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E)
None of these
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The gap between two neurons is called:
A)
Dendrite
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B)
synapse
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C)
Axon
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D)
impulse
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E)
None of these
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Asexual reproduction takes place through budding in:
A)
Paramecium
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B)
hydra
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C)
Leis mania
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D)
plasmodium
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E)
None of these
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Villi present on the inner lining of intestinal wall:
A)
Secretes enzymes for digestion
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B)
Secretes hormones
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C)
Decreases the surface area for absorption
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D)
Increases the surface area for absorption
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E)
None of these
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Which letter represents glomerulus in the following diagram?
A)
P
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B)
Q
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C)
R
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D)
S
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E)
None of these
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Which one of the following is a plant hormone?
A)
Insulin
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B)
Thyroxin
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C)
Oestrogen
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D)
Cytokinin
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E)
None of these
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The embryo gets nutrition from the mother's blood with the help of a special tissue called:
A)
zygote
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B)
cervix
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C)
Placenta
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D)
oviduct
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E)
None of these
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Which one of the following statements is correct about genotype?
A)
Genotype is the description of genes present in an organism
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B)
The characteristic which is visible in an organism is called its genotype
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C)
Genotype decides the appearance of an organism even in the presence of an alternative gene
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D)
All of these
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E)
None of these
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Speciation takes place when variation occurs with
A)
Mood changes
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B)
Death of an organism
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C)
Changes due to accidents
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D)
Geographical isolation
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E)
None of these
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Which one of the following statements about the transfer of energy in an ecosystem is incorrect?
A)
Energy is not created in an ecosystem. Energy is only converted from one form to another
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B)
There is a continuous transfer of energy from one trophic level of organisms to the next in a food chain
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C)
There is no loss of energy in transferring energy from one trophic level to another
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D)
At each trophic level, some of the energy is utilized by the organisms for their growth, reproduction and development
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E)
None of these
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60 J of work is done in moving a charge of 5 C from one terminal of the battery to another. What is the potential difference of the battery?
A)
6 V
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B)
3 V
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C)
10 V
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D)
15 V
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E)
None of these
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A charge of 4 C flows through any cross section of a conductor in 5 seconds. What is the current flowing through the conductor?
A)
0.8 A
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B)
2 A
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C)
4 A
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D)
20 A
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E)
None of these
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An electric heater of resistance \[8\,\,\Omega \]draws 15 A from the service mains in 2 hours. Calculate the rate at which heat is developed in the heater.
A)
400 J/s
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B)
600 J/s
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C)
1200 J/s
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D)
1800 J/s
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E)
None of these
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A convex mirror used for rear-view in an automobile has a radius of curvature of 2 m. If a bus is located at 6 m from this mirror, find the position of the image.
A)
The image will form behind the mirror at the distance of 0.857m
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B)
The image will form in front of the mirror at the distance of 4.125 m
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C)
The image will form behind the mirror at the distance of 3.65 m
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D)
The image will form in front of the mirror at the distance of 0.253 m
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E)
None of these
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A beam of light passes from air into a substance X. If the angle of incidence be \[45{}^\circ \]and the angle of refraction be\[30{}^\circ \], calculate the refractive index of the substance X. (Given:\[\sin \,30{}^\circ =0.500,\] \[\sin \,45{}^\circ =0.707\]).
A)
2.023
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B)
4.256
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C)
0.234
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D)
3.321
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E)
None of these
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A convex lens of focal length 10 cm is placed at a distance of 12 cm from a wall. How far from the lens an object be placed so as to form its real image on the wall?
A)
The object should be placed at the distance of 30 m from the lens
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B)
The object should be placed at the distance of 60 m from the lens
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C)
The object should be placed at the distance of 20 m from the lens
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D)
The object should be placed at the distance of 40 m from the lens
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E)
None of these
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A person having a myopic eye uses a concave lens of focal length 50 cm. What is the power of the lens?
A)
\[+\,2\,D\]
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B)
\[+\,1\,\,D\]
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C)
\[-\,1\,\,D\]
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D)
\[-\,2\,\,D\]
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E)
None of these
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The near point of a hypermetric eye is 50 cm, what is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.
A)
\[+\,2\,\,D\]
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B)
\[+\,3\,\,D\]
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C)
\[-\,2\,\,D\]
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D)
\[-\,3\,\,D\]
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E)
None of these
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