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1. A
   donor
2. B
   intrinsic
3. C
   acceptor
4. D
   extrinsic

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1. A
   2:3
2. B
   3:4
3. C
   4:5
4. D
   5:6

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1. A
   0.1 s
2. B
   0.12 s
3. C
   0.14 s
4. D
   0.16 s

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

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1. A
   the average kinetic energy of gas molecules.
2. B
   the average potential energy of gas molecules.
3. C
   the average distance between the molecules of a gas.
4. D
   the size of the molecules of a gas

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1. A
   constant
2. B
   zero
3. C
   decreasing
4. D
   increasing

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1. A
   $5 \times 10^5\,\text{N/C}$
2. B
   $6 \times 10^5\,\text{N/C}$
3. C
   $7 \times 10^5\,\text{N/C}$
4. D
   $8 \times 10^5\,\text{N/C}$

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

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1. A
   2
2. B
   4
3. C
   16
4. D
   32

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1. A
   $a+b$
2. B
   $\frac{a+b}{2}$
3. C
   $\sqrt{a^2+b^2}$
4. D
   $\frac{a+b}{ab}$

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1. A
   $E_a = E_q$
2. B
   $E_a = \frac{1}{2}E_q$
3. C
   $E_a = \frac{1}{\sqrt{2}}E_q$
4. D
   $E_a = 2E_q$

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1. A
   $\frac{1}{16}$
2. B
   $\frac{1}{4}$
3. C
   $\frac{1}{8}$
4. D
   $\frac{1}{24}$

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

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1. A
   $\frac{2a}{3b}$
2. B
   $\frac{a}{b}$
3. C
   $\frac{a}{3b}$
4. D
   Zero

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

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1. A
   $320°C$
2. B
   $39°C$
3. C
   325 K
4. D
   $325°C$

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1. A
   $\frac{1}{128}$
2. B
   128
3. C
   32
4. D
   64

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1. A
   $1:n$
2. B
   $n:1$
3. C
   $1:n^2$
4. D
   $n^2:1$

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

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1. A
   1.2 H
2. B
   2.4 H
3. C
   3.6 H
4. D
   6 H

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1. A
   $\frac{11}{15}$
2. B
   $\frac{13}{14}$
3. C
   $\frac{15}{14}$
4. D
   $\frac{14}{15}$

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1. A
   1.1
2. B
   1.3
3. C
   1.5
4. D
   1.4

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1. A
   $i > e$
2. B
   $i < e$
3. C
   $i = e$
4. D
   $i + e = 90°$

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1. A
   decreases surface tension of water.
2. B
   increases surface tension of water.
3. C
   makes surface tension of water zero.
4. D
   increases its density.

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1. A
   0.25 m
2. B
   0.5 m
3. C
   1 m
4. D
   $\infty$

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