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1. A
   $\frac{T}{8}$
2. B
   $\frac{T}{12}$
3. C
   $\frac{T}{16}$
4. D
   $\frac{T}{24}$

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

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1. A
   the conduction band.
2. B
   the valance band.
3. C
   the band gap and are close to conduction band.
4. D
   the band gap and are close to valance band.

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1. A
   20%
2. B
   30%
3. C
   44%
4. D
   66%

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

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

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1. A
   3:2
2. B
   9:4
3. C
   16:81
4. D
   81:16

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

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

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1. A
   $r^{-1}$
2. B
   $r$
3. C
   $r^{2}$
4. D
   $r^{-2}$

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1. A
   10:9
2. B
   9:10
3. C
   7:10
4. D
   10:7

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1. A
   $\frac{50}{350}\,\mu\text{A}$
2. B
   $(350-50)\,\mu\text{A}$
3. C
   $(350+50)\,\mu\text{A}$
4. D
   $\frac{350}{50}\,\mu\text{A}$

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1. A
   $1.9\times10^{-5}/^{\circ}\text{C}$
2. B
   $2.4\times10^{-5}/^{\circ}\text{C}$
3. C
   $3.5\times10^{-5}/^{\circ}\text{C}$
4. D
   $7\times10^{-5}/^{\circ}\text{C}$

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1. A
   4 nodes and 3 antinodes.
2. B
   6 nodes and 5 antinodes.
3. C
   5 nodes and 4 antinodes.
4. D
   4 nodes and 5 antinodes.

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1. A
   50 V
2. B
   100 V
3. C
   150 V
4. D
   200 V

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

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1. A
   100 s
2. B
   10 s
3. C
   0.1 s
4. D
   0.01 s

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1. A
   $m(GMr)^{3/2}$
2. B
   $m(GMr)$
3. C
   $m(GMr)^{1/2}$
4. D
   $m(GMr)^{-1/2}$

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1. A
   200 cm
2. B
   210 cm
3. C
   225 cm
4. D
   250 cm

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

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1. A
   20 W
2. B
   25 W
3. C
   50 W
4. D
   100 W

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1. A
   $n-1$
2. B
   $n$
3. C
   $n+1$
4. D
   $2n$

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1. A
   16
2. B
   20
3. C
   40
4. D
   60

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

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1. A
   Nichrome
2. B
   Bronze
3. C
   Stainless steel
4. D
   Cupra-nickel

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