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1. A
   $\frac{24Rh}{25m}$
2. B
   $\frac{25Rh}{24m}$
3. C
   $\frac{25m}{24Rh}$
4. D
   $\frac{24m}{25Rh}$

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1. A
   no change in diffraction pattern.
2. B
   diffraction bands become narrow and crowded together.
3. C
   diffraction bands become broader and farther apart.
4. D
   bands disappear.

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1. A
   50 Hz
2. B
   200 Hz
3. C
   500 Hz
4. D
   20 Hz

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1. A
   Electric lines of force originate from a -vely charged object and terminate on a +vely charged object.
2. B
   The electric lines of force do not pass through an insulator but can pass through a conductor.
3. C
   The electric lines of force do not intersect each other.
4. D
   Electric intensity is small in a region where the lines of force are crowded.

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1. A
   depletion of positive charges near the junction.
2. B
   accumulation of positive charges near the junction.
3. C
   depletion of negative charges near the junction.
4. D
   accumulation of positive and negative charges near the junction.

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1. A
   $\frac{2g}{3}$
2. B
   $\frac{5g}{14}$
3. C
   $\frac{g}{3}$
4. D
   $\frac{5g}{7}$

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

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1. A
   $\frac{l_1}{l_1 + l_2}$
2. B
   $\frac{l_1}{l_1 - l_2}$
3. C
   $\frac{l_1 + l_2}{l_1}$
4. D
   $\frac{l_1 + l_2}{l_1 - l_2}$

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1. A
   OR gate
2. B
   NOR gate
3. C
   XOR gate
4. D
   NAND gate

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1. A
   pressure is constant.
2. B
   volume is constant.
3. C
   temperature is constant.
4. D
   internal energy is constant.

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1. A
   $(n-1)f$
2. B
   $\frac{n-1}{n}f$
3. C
   $\frac{n+1}{n}f$
4. D
   $(n+1)f$

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1. A
   $\frac{\omega^2 R^2 d}{2}$
2. B
   $\frac{\omega^2 R d}{2}$
3. C
   $\frac{\omega R d^2}{2}$
4. D
   $\frac{\omega^2 R^2 d^2}{2}$

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1. A
   stationary longitudinal.
2. B
   stationary transverse.
3. C
   progressive transverse.
4. D
   progressive longitudinal.

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1. A
   -20 cm
2. B
   -40 cm
3. C
   -60 cm
4. D
   -80 cm

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1. A
   $24\,\Omega$
2. B
   $36\,\Omega$
3. C
   $12\,\Omega$
4. D
   $6\,\Omega$

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1. A
   35 mA
2. B
   25 mA
3. C
   15 mA
4. D
   5 mA

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1. A
   800 N
2. B
   2800 N
3. C
   4200 N
4. D
   2000 N

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1. A
   0.021
2. B
   0.048
3. C
   0.056
4. D
   0.084

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

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1. A
   3:1
2. B
   4:1
3. C
   9:1
4. D
   10:1

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1. A
   zero.
2. B
   proportional to V.
3. C
   proportional to $V^{-1}$.
4. D
   finite but does not depend on V.

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1. A
   375 m
2. B
   360 m
3. C
   40 m
4. D
   25 m

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1. A
   $\frac{V_1}{V-V_1}n$
2. B
   $\frac{V_1-V}{V+V_1}n$
3. C
   $\frac{V+V_1}{V-V_1}n$
4. D
   $\frac{V-V_1}{V+V_1}n$

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1. A
   $\frac{x\lambda}{2}$
2. B
   $\frac{x+1}{2}\cdot\frac{\lambda}{2}$
3. C
   $\frac{(x+1)\lambda}{2}$
4. D
   $\frac{(x-1)\lambda}{2}$

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1. A
   9 cm
2. B
   7 cm
3. C
   5 cm
4. D
   3 cm

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