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1. A
   $\frac{v^2}{2El}$
2. B
   $\frac{v^2 l}{2E}$
3. C
   $\frac{2Ev^2}{l}$
4. D
   $\frac{v^2 l}{E}$

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1. A
   $W_1 D_1 = W_2 D_2 = W_3 D_3 = W_4 D_4$
2. B
   $\frac{W_1}{D_1} = \frac{W_2}{D_2} = \frac{W_3}{D_3} = \frac{W_4}{D_4}$
3. C
   $\frac{W_1}{D_1} = \frac{W_2}{D_2} = \frac{W_3}{D_3} = \frac{W_3}{D_3}$
4. D
   $D_1 W_1 = D_2 W_2 = D_3 W_3 = D_4 W_4$

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

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

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1. A
   0.1 kg
2. B
   0.2 kg
3. C
   0.3 kg
4. D
   0.4 kg

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1. A
   drift of electrons.
2. B
   migration of impurity ions.
3. C
   diffusion of charge carriers.
4. D
   drift of holes.

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1. A
   1:15
2. B
   1:4
3. C
   4:5
4. D
   5:4

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1. A
   544, 480
2. B
   480, 544
3. C
   612, 544
4. D
   544, 612

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1. A
   2
2. B
   4
3. C
   6
4. D
   8

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1. A
   2.4 H
2. B
   2.0 H
3. C
   1.2 H
4. D
   0.6 H

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

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1. A
   $22$ km/s
2. B
   11 km/s
3. C
   5.5 km/s
4. D
   15.5 km/s

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1. A
   $2.4\times10^{-3}$ N/m$^2$
2. B
   $1.2\times10^{-3}$ N/m$^2$
3. C
   $2.4\times10^{-4}$ N/m$^2$
4. D
   $1.2\times10^{-4}$ N/m$^2$

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1. A
   $12\times10^6$ m/s
2. B
   $6\times10^6$ m/s
3. C
   $3\times10^6$ m/s
4. D
   $24\times10^6$ m/s

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1. A
   low pressure and low temperature.
2. B
   low pressure and high temperature.
3. C
   high pressure and low temperature.
4. D
   high pressure and high temperature.

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1. A
   2p
2. B
   3s
3. C
   3d
4. D
   4p

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1. A
   1-chloro-1,2-dimethylbut-2-ene
2. B
   4-chloro-3,4-dimethylbut-2-ene
3. C
   4-chloro-3-methylpent-2-ene
4. D
   2-chloro-3-methylpent-3-ene

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1. A
   C₆H₈N
2. B
   C₆H₁₀N
3. C
   C₆H₁₂N
4. D
   C₆H₁₃N

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1. A
   5.65 kcal
2. B
   6.28 kCal
3. C
   7.05 kCal
4. D
   9.72 kCal

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1. A
   ICl
2. B
   IBr
3. C
   IF₃
4. D
   IF₅

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1. A
   49.2 g mol⁻¹
2. B
   44.5 g mol⁻¹
3. C
   54.2 g mol⁻¹
4. D
   56.4 g mol⁻¹

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1. A
   Urea formaldehyde resin
2. B
   Bakelite
3. C
   Polythene
4. D
   Buna-N

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1. A
   169.3 pm
2. B
   211.6 pm
3. C
   380.8 pm
4. D
   413.2 pm

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1. A
   CH₃-CH₂-CN
2. B
   CH₃-CH₂-CH₃
3. C
   CH₃-NH-C₂H₅
4. D
   CH₃-CH₂-NH₂

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

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