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1. A
   0.25
2. B
   0.50
3. C
   0.75
4. D
   0.90

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1. A
   $(n-1)G$
2. B
   $G/n$
3. C
   $nG$
4. D
   $\frac{G}{n-1}$

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1. A
   zero ampere
2. B
   1 ampere
3. C
   0.1 ampere
4. D
   0.2 ampere

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1. A
   $\frac{1}{24\pi}$
2. B
   $\frac{\pi}{20}$
3. C
   $\frac{\pi}{40}$
4. D
   $\frac{1}{12\pi}$

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1. A
   of wavelength one metre
2. B
   travelling with a velocity of 100 m/s in the negative $x$-direction
3. C
   of frequency $\frac{100}{\pi}\ \text{Hz}$
4. D
   travelling with a velocity of $50\pi\ \text{m/s}$ in the positive $x$-direction

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1. A
   $8\times10^{-2}\ \text{Wb/m}^2$
2. B
   $6\times10^{-2}\ \text{Wb/m}^2$
3. C
   $5\times10^{-2}\ \text{Wb/m}^2$
4. D
   $2\times10^{-2}\ \text{Wb/m}^2$

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1. A
   20 m
2. B
   18 m
3. C
   15 m
4. D
   12 m

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1. A
   increases.
2. B
   may increase or decrease.
3. C
   decreases.
4. D
   remains unchanged.

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1. A
   $\frac{H}{B}=\mu_0(1+\chi)$
2. B
   $\frac{B}{H}=\mu_0(1+\chi)$
3. C
   $\frac{H}{B}=\mu_0(\chi-1)$
4. D
   $\frac{B}{H}=\mu_0(1-\chi)$

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1. A
   780
2. B
   390
3. C
   260
4. D
   50

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1. A
   $10^{-7}\mu_0$
2. B
   $10^{-10}\mu_0$
3. C
   $10^{-14}\mu_0$
4. D
   $10^{-17}\mu_0$

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

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

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1. A
   $\left(\frac{T_2}{T_1}\right)^4$
2. B
   $\left(\frac{T_2}{T_1}\right)^2$
3. C
   $\left(\frac{T_1}{T_2}\right)^4$
4. D
   $\left(\frac{T_1}{T_2}\right)^2$

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1. A
   3:1
2. B
   30:1
3. C
   50:7
4. D
   108:7

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1. A
   $\sqrt{3}\,pE$
2. B
   $2pE$
3. C
   $pE$
4. D
   $\frac{pE}{2}$

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1. A
   $0.77\ \text{mol kg}^{-1}$
2. B
   $0.69\ \text{mol kg}^{-1}$
3. C
   $0.50\ \text{mol kg}^{-1}$
4. D
   $0.35\ \text{mol kg}^{-1}$

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1. A
   $\text{Zn}^{2+}$
2. B
   $\text{Fe}^{2+}$
3. C
   $\text{Cu}^{+}$
4. D
   $\text{Sc}^{3+}$

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1. A
   $6.0\ \text{g cm}^{-3}$
2. B
   $9.0\ \text{g cm}^{-3}$
3. C
   $5.0\ \text{g cm}^{-3}$
4. D
   $7.0\ \text{g cm}^{-3}$

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1. A
   $-\text{CONH}_2$
2. B
   $-\text{CN}$
3. C
   $-\text{OH}$
4. D
   $-\text{C}\equiv\text{C}-$

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1. A
   Trigonal pyramidal
2. B
   Square pyramidal
3. C
   Square planar
4. D
   Distorted octahedral

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1. A
   $3.0\times10^{-4}\ \text{M}$
2. B
   $6.0\times10^{-4}\ \text{M}$
3. C
   $2.0\times10^{-4}\ \text{M}$
4. D
   $4.0\times10^{-4}\ \text{M}$

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1. A
   It is good to use the technique of protection and deprotection of functional group in organic synthesis.
2. B
   Use of chemicals derived from plant resource is better than crude oil.
3. C
   Use of biodegradable pesticides is advantageous.
4. D
   Use of critical CO2 as solvent is better than organic solvents.

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1. A
   $8.2\times10^{-3}\ \Omega^{-1}\ \text{cm}^{-1}$
2. B
   $2.8\times10^{-3}\ \Omega^{-1}\ \text{cm}^{-1}$
3. C
   $4.1\times10^{-3}\ \Omega^{-1}\ \text{cm}^{-1}$
4. D
   $5.4\times10^{-3}\ \Omega^{-1}\ \text{cm}^{-1}$

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1. A
   2
2. B
   4
3. C
   6
4. D
   12

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