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1. Given below are the structures of some hydrocarbons. Select the two structures which are related to each other from the given options:

A. (i) and (iv) B. (ii) and (iv) C. (ii) and (iii) D. (i) and (iii)

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2. Choose the incorrect statement about the common reaction used in hydrogenation of vegetable oils.

A. It is an addition reaction. B. It takes place in the presence of nickel or palladium catalyst. C. The product contains only single bonds between carbon atoms. D. It is an addition reaction which occurs in the presence of an acid catalyst.

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3. Consider the following chemical equation:

P Al + qH₂O → r Al₂O₃ + sH₂
To balance this chemical equation, the values of 'p', 'q', 'r' and 's' must be respectively:

A. 3, 2, 2, 1 B. 2, 3, 3, 1 C. 2, 3, 1, 3 D. 3, 1, 2, 2

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4. Study the following cases:

(i) CuSO₄ + Mg →

(ii) FeSO₄ + Pb →

(iii) CaSO₄ + Al →

(iv) ZnSO₄ + Ca →

The case/cases in which new product(s) will form is/are:

A. Only (i) B. Only (iii) C. (i) and (iv) D. (i), (ii) and (iv)

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5. Which of the given option represents a family of salts?

A. NaCl, Na₂SO₄, CaSO₄ B. K₂SO₄, Na₂SO₄, CaSO₄ C. NaNO₃, CaCO₃, Na₂CO₃ D. MgSO₄, CuSO₄, MgCl₂

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6. Match Column-I with Column-II and select the correct option from the choices provided.

A. a-(ii), b-(i), c-(v), d-(iv) B. a-(iii), b-(i), c-(v), d-(iv) C. a-(iv), b-(ii), c-(iii), d-(i) D. a-(iii), b-(ii), c-(i), d-(iv)

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7. The part of the hind-brain controlling involuntary actions such as salivation and vomiting in humans is:

A. Cerebellum B. Cerebrum C. Pons D. Medulla

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8. Select a pair of bisexual flowers from the following:

A. Papaya and mustard B. Hibiscus and mustard C. Hibiscus and papaya D. Hibiscus and watermelon

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9. The plant hormone present in greater concentration in the areas of rapidly dividing cells is:

A. Auxin B. Cytokinins C. Gibberellins D. Abscisic acid

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10. Temporary finger-like extensions on the cell surface to take in food is formed in:

A. Paramoecium B. Amoeba C. Leishmania D. Rhizopus

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11. 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:

A. 3R B. 6R C. 9R D. 27R

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12. Which one of the following statements is not true about a bar magnet?

A. It sets itself in north-south direction when suspended freely. B. It has attractive power for iron filings. C. It produces magnetic field lines. D. The direction of magnetic field lines inside a bar magnet is from its north pole to its south pole.

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13. Absolute refractive index of water and glass is 4/3 and 3/2 respectively. If the speed of light in glass is 2 × 10⁸ m/s, the speed of light in water is:

A. 9/4m/s B. 7/3m/s C. 16/9m/s D. 9/8m/s

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14. 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:

A. red B. orange C. blue D. yellow

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15. The strength of the magnetic field produced inside a current-carrying long straight solenoid does not depend upon:

A. Area of cross-section of the tube of the solenoid B. Number of turns per unit length in the solenoid C. Direction of current flowing through the coil of the solenoid D. Material of the core of the solenoid

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16. 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?

(i) Aquatic plants and aquatic animals

(ii) Terrestrial plants and terrestrial animals

(iii) Decomposers as bacteria and fungi

(iv) Consumers as clown fishes and sea urchins

A. (i) and (iv) B. (ii) and (iii) C. (i) and (iii) D. (ii) and (iv)

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17. Assertion (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.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

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18. 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.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

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19. 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.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.

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20. 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.

A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). C. Assertion (A) is true, but Reason (R) is false. D. Assertion (A) is false, but Reason (R) is true.