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1. A
   $\tan^{-1}\left(\frac{5}{4}\right)$
2. B
   $\tan^{-1}\left(\frac{4}{5}\right)$
3. C
   $\tan^{-1}\left(\frac{3}{4}\right)$
4. D
   $\tan^{-1}\left(\frac{4}{3}\right)$

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1. A
   3
2. B
   6
3. C
   10
4. D
   9

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1. A
   $60°$
2. B
   $45°$
3. C
   $90°$
4. D
   $180°$

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1. A
   5.5 mm
2. B
   5.75 mm
3. C
   6.25 mm
4. D
   6.75 mm

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1. A
   $20°C$
2. B
   $15°C$
3. C
   $10°C$
4. D
   $5°C$

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1. A
   10:9
2. B
   11:10
3. C
   $(11)^2:(10)^2$
4. D
   $(9)^2:(10)^2$

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

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1. A
   35
2. B
   24
3. C
   14
4. D
   7

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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
   $230\,\text{Nm}^{-1}$
2. B
   $120\,\text{Nm}^{-1}$
3. C
   $60\,\text{Nm}^{-1}$
4. D
   $30\,\text{Nm}^{-1}$

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1. A
   $\frac{\mu_0 I}{4}\left(\frac{1}{R_1} + \frac{1}{R_2}\right)$
2. B
   $\frac{\mu_0 l}{4}\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$
3. C
   $\frac{\mu_0 I}{2\pi}\left(\frac{1}{R_1} + \frac{1}{R_2}\right)$
4. D
   $\frac{\mu_0 I}{2\pi}\left(\frac{1}{R_1} - \frac{1}{R_2}\right)$

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

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1. A
   coercivity
2. B
   retentivity
3. C
   domain
4. D
   saturation

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1. A
   1.5%
2. B
   15%
3. C
   5%
4. D
   0.5%

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1. A
   $2 \times 10^{14}\,\text{Hz}$
2. B
   $4 \times 10^{14}\,\text{Hz}$
3. C
   $6 \times 10^{15}\,\text{Hz}$
4. D
   $8 \times 10^{15}\,\text{Hz}$

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

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1. A
   Se
2. B
   Br
3. C
   I
4. D
   S

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1. A
   Ti
2. B
   Sc
3. C
   Zn
4. D
   Ni

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1. A
   1.202 V
2. B
   -1.202 V
3. C
   0.396 V
4. D
   -0.396 V

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

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1. A
   doped with P, As, Sb → n-type
2. B
   doped with B, Al, Ga → p-type
3. C
   doped with Ge, Si → intrinsic
4. D
   doped with In → p-type

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1. A
   Zn-Hg / conc. HCl / $\Delta$ reduction (Clemmensen)
2. B
   LiAlH4 reduction
3. C
   Wolff-Kishner reduction
4. D
   Rosenmund reduction

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1. A
   $0.081\,\text{mol dm}^{-3}\text{bar}^{-1}$
2. B
   $0.075\,\text{mol dm}^{-3}\text{bar}^{-1}$
3. C
   $0.093\,\text{mol dm}^{-3}\text{bar}^{-1}$
4. D
   $0.049\,\text{mol dm}^{-3}\text{bar}^{-1}$

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1. A
   Hexaamminecobalt (III) chloride
2. B
   Potassium hexacyanoferrate(II)
3. C
   Tetraamminedichlorocobalt(III) ion
4. D
   Pentaamminechlorocobalt(III) sulphate

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1. A
   $4.54 \times 10^{-8}\,\text{cm}$
2. B
   $5.24 \times 10^{-8}\,\text{cm}$
3. C
   $6.42 \times 10^{-8}\,\text{cm}$
4. D
   $1.13 \times 10^{-8}\,\text{cm}$

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