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1. A
   $200\ \Omega,\ \frac{\sqrt{3}}{\pi}\ \text{H}$
2. B
   $100\ \Omega,\ \sqrt{3}\ \text{H}$
3. C
   $200\ \Omega,\ 1\ \text{H}$
4. D
   $100\ \Omega,\ 1\ \text{H}$

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1. A
   the input impedance is high and the output impedance is low.
2. B
   the base emitter junction is reverse biased.
3. C
   input signal is applied between the base and emitter and output is obtained between collector and emitter.
4. D
   the input voltage and output voltage are in phase.

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1. A
   Zero
2. B
   $\frac{\mu_0}{4\pi}\frac{2}{r}(1+\pi)$
3. C
   $\frac{\mu_0}{4\pi}\frac{I}{r}(1+\pi)$
4. D
   $\frac{\mu_0}{4\pi}\frac{2I}{r}(\pi-1)$

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1. A
   $2\pi\sqrt{\frac{abc}{g}}$
2. B
   $\frac{bcd}{g}$
3. C
   $2\pi\sqrt{\frac{g}{da}}$
4. D
   $2\pi\sqrt{\frac{ad}{g}}$

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1. A
   2 mA
2. B
   20 mA
3. C
   30 mA
4. D
   10 mA

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1. A
   $\frac{ML^2}{3}$
2. B
   $\frac{2ML^2}{3}$
3. C
   $\frac{2ML^2}{9}$
4. D
   $\frac{4ML^2}{3}$

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1. A
   I
2. B
   4I
3. C
   5I
4. D
   3I

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1. A
   remain constant
2. B
   be halved
3. C
   become 9 times
4. D
   become $\frac{1}{9}$ times

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1. A
   E
2. B
   3E
3. C
   $12E$
4. D
   $15E$

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1. A
   5 cm/s
2. B
   $5\sqrt{2}$ cm/s
3. C
   $5\times2^{1/3}$ cm/s
4. D
   $5\times(4)^{1/3}$ cm/s

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1. A
   Sound wave travels in a straight line.
2. B
   Sound is propagated as waves.
3. C
   Sound can travel through vacuum.
4. D
   Sound is a form of energy.

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1. A
   $3r_1$
2. B
   $4r_1$
3. C
   $9r_1$
4. D
   $16r_1$

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

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1. A
   2:1
2. B
   1:2
3. C
   $-1:2$
4. D
   $-2:1$

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1. A
   0.02 V
2. B
   0.04 V
3. C
   0.08 V
4. D
   0.16 V

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1. A
   $\frac{RI_w}{\pi I_c}$
2. B
   $\frac{RI_C}{\pi I_w}$
3. C
   $\frac{\pi I_C R}{I_w}$
4. D
   $\frac{\pi I_W R}{I_C}$

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1. A
   $T_a = 2T_b$
2. B
   $T_a = \frac{T_c}{2}$
3. C
   $T_b = 2T_a$
4. D
   $T_b = 2T_c$

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1. A
   $\pm\frac{q}{3}$
2. B
   $+\frac{q}{5}$
3. C
   $+\frac{q}{6}$
4. D
   $+6q$

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1. A
   0.5 A
2. B
   1.5 A
3. C
   1 A
4. D
   0.15 A

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

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1. A
   neither rise nor fall.
2. B
   get depressed only.
3. C
   rise only.
4. D
   rise up to the top of the tube.

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

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

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

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1. A
   (G)
2. B
   (F)
3. C
   (H)
4. D
   (E)

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