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1
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Consider the following chemical equation : pAl + q H2O → r Al2 O3 + SH2
To balance this chemical equation, the values of 'p', 'a, "r' and 's' must be respectively :
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(C) 2,3,1,3
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2
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Which of the given option represents a family of salts?
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(B) K2SO4 , NA2SO4 , CaSO4
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3
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The most common method of extraction of metals from their oxide ores iS :
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(A) Reduction with carbon
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4
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Given below are the structures of some hydrocarbons. Select the two structures which are related to each other from the given options
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C (ii) and (iii)
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5
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Choose the incorrect statement about the common reaction used in hydrogenation of vegetable oils.
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(D) It is an addition reaction which occurs in the presence of an acid catalyst.
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6
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Match Column 1 with Column2
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D
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7
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The part of the brain which maintains the posture and balance of the body is :
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(C) Cerebellum
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8
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The plant hormone present in greater concentration in the areas of rapidly dividing cells is :
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(B) Cytokinins
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9
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Select a pair of bisexual flowers from the following :
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(B) Hibiscus and mustard
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10
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The gastric glands present in the wall of the stomach release :
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(C) Mucus and Pepsin
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11
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11: Absolute refractive index of water and glass is 4/3 and 3/2 respectively. If the speed of light in glass is 2 x 108 m/s, the speed of light in water is :
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(A) 9/4 ms
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12
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When a beam of white light passes through a region of very fine dust particles, the colour of light that scatters the most in that region is :
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(C) Blue
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13
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A wire of length 'l' is gradually stretched so that its length increases to 3l. If its original resistance is R, then its new resistance will be:
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(C) 9R
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14
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Which one of the following statements is not true about a bar magnet ?
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(D)The direction of magnetic field lines inside a bar magnet is from its north pole to its south pole.
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15
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The strength of magnetic field produced inside a long straight current carrying solenoid does not depend upon :
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(B) Direction of current flowing through the solenoid
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16
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Other than the abiotic components, which of the given biotic components are not required to make an aquarium with small herbivorous fishes a self-sustaining system ?
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D (ii) and (IV)
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17
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Assertion (A) : Hydrogen gas is not evolved when a metal reacts with nitric acid.
Reason (R) : Nitric acid is a strong reducing agent and reduces the hydrogen produced in the reaction to water.
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C
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18
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(A) : In our actions of writing or talking, our nervous system communicates with the muscles.
Reason (R) : Cranial nerves and spinal nerves form the peripheral nervous system.
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B
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19
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Assertion (A) : Magnetic field lines around a bar magnet never intersect each other.
Reason (R) : Magnetic field produced by a bar magnet is a quantity that has both magnitude and direction.
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B
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20
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Assertion (A) Use of jute bags for shopping reduces pollution
Reason (R) : Jute is biodegradable and its bag may be reused as and when needed.
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A
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