1. A
   Loop assumes circular shape with its plane normal to the field.
2. B
   Loop assumes circular shape with its plane parallel to the field.
3. C
   Wire gets stretched to become straight.
4. D
   Shape of the loop remains unchanged.

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1. A
   $9\text{ }T$
2. B
   $27\text{ }T$
3. C
   $12\text{ }T$
4. D
   $3\text{ }T$

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

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1. A
   1.05 and 0.99
2. B
   0.72 and 0.54
3. C
   0.85 and 0.99
4. D
   0.68 and 0.72

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

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1. A
   $N_{2}O$
2. B
   ${NO}_{3}^{-}$
3. C
   NO
4. D
   ${NO}_{2}^{-}$

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1. A
   Fructose
2. B
   Galactose
3. C
   Glucose
4. D
   Sucrose

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1. A
   - (ii),
2. B
   - (iv),
3. C
   - (iii),
4. D
   - (i)

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

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1. A
   A-(iii) B-(ii) C-(iv) D-(I)
2. B
   A-iv, B-(iii), C-(ii) D-(i)
3. C
   a-(iv) b-(iii) c-(i) d-(ii)
4. D
   a-iv, b-ii, c-iii, d-i

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1. A
   A-ii, B-i, C-iv, D-iii
2. B
   A-iii, B-iv, C-ii, D-i
3. C
   A-iii, B-i, C-iv, D-ii
4. D
   A-ii, B-iv, C-i, D-iii

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1. A
   (A), (B), (C) only
2. B
   (A) and (B) only
3. C
   (B), (C), (D) only
4. D
   (A), (B), (D) only

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1. A
   A-i, B-iv, C-iii, D-ii
2. B
   A-iii, B-ii, C-iv, D-i
3. C
   A-iii, B-iv, C-ii, D-i
4. D
   A-iii, B-ii, C-i, D-iv

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1. A
   Positional isomerism
2. B
   Both positional isomerism and metamerism
3. C
   Metamerism
4. D
   Functional group isomerism

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

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1. A
   $2\text{ }s$
2. B
   $3\text{ }s$
3. C
   $3p$
4. D
   $2p$

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

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1. A
   a-ii, b-iv, c-i, d-iii
2. B
   a-i, b-iii, c-ii, d-iv
3. C
   a-iii, b-i, c-iv, d-ii
4. D
   a-iv, b-ii, c-i, d-iii

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1. A
   Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$
2. B
   $A$ is true but $R$ is false
3. C
   Both $A$ and $R$ are true and $R$ is the correct explanation of $A$
4. D
   A is false but R is true

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1. A
   3
2. B
   0
3. C
   2
4. D
   1

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1. A
   $M_{2}{\text{ }A}_{3}$
2. B
   $M_{4}{\text{ }A}_{3}$
3. C
   $M_{4}\text{ }A$
4. D
   ${MA}_{3}$

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1. A
   Cryolite
2. B
   Bauxite
3. C
   Calamine
4. D
   Kaolite

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1. A
   $y\left( \frac{dy}{dx} \right)^{2} - 2x\left( \frac{dy}{dx} \right) - y = 0$
2. B
   $y\left( \frac{dy}{dx} \right)^{2} - 2x\left( \frac{dy}{dx} \right) + y = 0$
3. C
   $y\left( \frac{dy}{dx} \right)^{2} + 2x\left( \frac{dy}{dx} \right) - y = 0$
4. D
   $y\left( \frac{dy}{dx} \right) + 2x\left( \frac{dy}{dx} \right) - y = 0$

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1. A
   1
2. B
   2
3. C
   3
4. D
   0

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1. A
   $2^{20}\left( 2^{20} - 21 \right)$
2. B
   $2^{19}\left( 2^{20} - 21 \right)$
3. C
   $2^{19}\left( 2^{20} + 21 \right)$
4. D
   $2^{20}\left( 2^{20} + 21 \right)$

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