1. A
   20 rpm
2. B
   40 rpm
3. C
   5 rpm
4. D
   10 rpm

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1. A
   $0.125 \times 10^{-3}$ C m$^{-2}$
2. B
   $0.25 \times 10^{-3}$ C m$^{-2}$
3. C
   $4 \times 10^{-3}$ C m$^{-2}$
4. D
   $0.4 \times 10^{-3}$ C m$^{-2}$

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1. A
   $\mu < \mu_0$
2. B
   $0 \le \mu_r < 1$
3. C
   $-1 \le \chi < 0$
4. D
   $1 < \mu_r < 1 + \varepsilon$

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1. A
   $K_1 = K_2$
2. B
   $2K_1 = K_2$
3. C
   $K_1 > K_2$
4. D
   $K_1 < K_2$

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1. A
   $\dfrac{v}{3}$
2. B
   $\dfrac{2v}{3}$
3. C
   $\dfrac{3v}{4}$
4. D
   $\dfrac{9v}{4}$

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1. A
   $\lambda_e > \lambda_\alpha$
2. B
   $\lambda_e = 4\lambda_\alpha$
3. C
   $\lambda_e = \lambda_\alpha$
4. D
   $\lambda_e < \lambda_\alpha$

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1. A
   10 J
2. B
   16 J
3. C
   4 J
4. D
   6 J

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1. A
   7.5 m
2. B
   10 m
3. C
   2.5 m
4. D
   5 m

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1. A
   $\omega L\, I_0\sin\omega t$
2. B
   $\dfrac{I_0}{\omega L}\sin\omega t$
3. C
   $\dfrac{I_0}{\omega L}\cos\omega t$
4. D
   $\omega L\, I_0\cos\omega t$

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1. A
   15
2. B
   7.5
3. C
   0.3
4. D
   150

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1. A
   $4v$
2. B
   $8v$
3. C
   $v$
4. D
   $2v$

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1. A
   $(10 \pm 4.2)\ \Omega$
2. B
   $(10 \pm 0.3)\ \Omega$
3. C
   $(10 \pm 0.1)\ \Omega$
4. D
   $(10 \pm 0.8)\ \Omega$

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1. A
   8 mA
2. B
   4 mA
3. C
   0.4 A
4. D
   4 A

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1. A
   $2\alpha : \delta$
2. B
   $\gamma : 2\delta$
3. C
   $4\alpha : \beta$
4. D
   $\gamma : 2\beta$

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1. A
   5
2. B
   $\sqrt{2}$
3. C
   $\sqrt{3}$
4. D
   $\sqrt{5}$

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1. A
   Light emitting diode
2. B
   Zener diode
3. C
   Photodiode
4. D
   Solar cell

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1. A
   0.4 T
2. B
   4 T
3. C
   0.4 mT
4. D
   4 mT

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1. A
   both $q$ and $V$
2. B
   the geometry of the capacitor
3. C
   $q$ only
4. D
   $V$ only

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1. A
   Statement I is correct but statement II is incorrect
2. B
   Statement I is incorrect but Statement II is correct
3. C
   Both Statement I and Statement II are correct
4. D
   Both Statement I and Statement II are incorrect

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1. A
   $10\ \Omega$
2. B
   $5\ \Omega$
3. C
   $40\ \Omega$
4. D
   $20\ \Omega$

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1. A
   Pfund series
2. B
   Brackett series
3. C
   Lyman series
4. D
   Balmer series

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

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1. A
   $2\sqrt{A}$
2. B
   $\dfrac{A}{2}$
3. C
   $\dfrac{A}{\sqrt{2}}$
4. D
   $A\sqrt{2}$

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1. A
   $4 \times 10^{-5}$ m
2. B
   $9 \times 10^{-8}$ m
3. C
   $4 \times 10^{-7}$ m
4. D
   $4 \times 10^{-4}$ m

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1. A
   high thermal expansion coefficient
2. B
   high specific heat capacity
3. C
   low density
4. D
   low boiling point

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