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1. A
   7.0 m
2. B
   7.5 m
3. C
   5.5 m
4. D
   3.2 m

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

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

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1. A
   $\frac{E_0^2}{2R}$
2. B
   $\frac{E_0^2}{4R}$
3. C
   $\frac{E_0^2}{2R}$
4. D
   $\frac{E_0^2}{8R}$

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1. A
   $2\lambda$
2. B
   $4\lambda$
3. C
   $6\lambda$
4. D
   $8\lambda$

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1. A
   1:3
2. B
   1:8
3. C
   8:1
4. D
   27:1

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1. A
   10 A
2. B
   $5\sqrt{2}\ \text{A}$
3. C
   20 A
4. D
   $10\sqrt{2}\ \text{A}$

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1. A
   240 V
2. B
   2400 V
3. C
   0.24 V
4. D
   0.08 V

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1. A
   $2\times10^{-34}\ \text{Js}$
2. B
   $6.63\times10^{-34}\ \text{Js}$
3. C
   $1\times10^{-34}\ \text{Js}$
4. D
   $3.14\times10^{-34}\ \text{Js}$

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1. A
   Heating of a copper utensil
2. B
   Heating a room by heater
3. C
   Heating of Iron rod
4. D
   Heat transferred from sun to earth

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1. A
   3 V/m
2. B
   0.1 V/m
3. C
   0.2 V/m
4. D
   0.3 V/m

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1. A
   3rd dark band
2. B
   4th bright band
3. C
   5th dark band
4. D
   6th bright band

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1. A
   soft ferromagnetic substance soft iron.
2. B
   diamagnetic substance fine copper gauge.
3. C
   paramagnetic substance aluminium.
4. D
   paramagnetic material tantalum.

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

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1. A
   4W
2. B
   3W
3. C
   $\frac{w}{2}$
4. D
   $\frac{w}{4}$

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1. A
   $x=y$
2. B
   $x=2y$
3. C
   $y=2x$
4. D
   $y=4x$

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1. A
   15 N
2. B
   24 N
3. C
   49 N
4. D
   74 N

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1. A
   $2x$
2. B
   $\frac{x}{2}$
3. C
   $\frac{x}{4}$
4. D
   $\frac{x}{8}$

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1. A
   $4P_0$
2. B
   $2P_0$
3. C
   $P_0$
4. D
   $\frac{P_0}{2}$

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1. A
   $2f,\ \frac{2}{3}P$
2. B
   $2f,\ \frac{P}{2}$
3. C
   $\frac{f}{2},\ 2P$
4. D
   $2f,\ \frac{P}{2}$

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1. A
   $\sqrt{\frac{g}{l}}$
2. B
   $\sqrt{mgl}$
3. C
   $\sqrt{\frac{3g}{l}}$
4. D
   $\sqrt{\frac{mg}{3l}}$

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1. A
   $2\pi\left(\frac{M_1 g x}{M+M_1}\right)^{\frac{1}{2}}$
2. B
   $2\pi\left(\frac{(M+M_1)x}{M_1 g}\right)^{\frac{1}{2}}$
3. C
   $\frac{\pi}{2}\left(\frac{M_1 g x}{M+M_1}\right)^{\frac{1}{2}}$
4. D
   $2\pi\left(\frac{M+M_1}{M_1 g x}\right)^{\frac{1}{2}}$

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1. A
   $\frac{u^2}{g}$
2. B
   $\frac{u^2\cos^2\theta}{g}$
3. C
   $\frac{u^2\sin^2\theta}{g}$
4. D
   $\frac{u^2\cos^2\theta}{2g}$

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1. A
   383 Hz, 388 Hz
2. B
   388 Hz, 392 Hz
3. C
   475 Hz, 480 Hz
4. D
   480 Hz, 485 Hz

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

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