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1. A
   Acceleration of electron in $n=2$ orbit is less than that in $n=1$ orbit.
2. B
   Angular momentum of electron in $n=2$ orbit is more than that in $n=1$ orbit.
3. C
   Kinetic energy of electron in $n=2$ orbit is less than that in $n=1$ orbit.
4. D
   Potential energy of electron in $n=2$ orbit is less than that in $n=1$ orbit.

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1. A
   0.8 mm
2. B
   0.12 mm
3. C
   0.10 mm
4. D
   0.08 mm

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1. A
   5 A
2. B
   3 A
3. C
   -3 A
4. D
   $-\frac{5}{6}$ A

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1. A
   $h:R$
2. B
   $h:2R$
3. C
   $R:h$
4. D
   $2h:R$

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1. A
   increase the magnetic field.
2. B
   increase the level of magnetic saturation of the core.
3. C
   reduce the residual magnetism in the core.
4. D
   reduce eddy current.

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1. A
   $47^\circ\text{C}$
2. B
   $132^\circ\text{C}$
3. C
   $320^\circ\text{C}$
4. D
   $405^\circ\text{C}$

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1. A
   $\frac{n_1}{n_1 - n_2}$
2. B
   $\frac{n_2}{n_1 - n_2}$
3. C
   $\frac{n_1^2}{n_1^2 - n_2^2}$
4. D
   $\frac{n_2^2}{n_1^2 - n_2^2}$

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1. A
   $\sqrt{E_x^2 + E_y^2}$
2. B
   $E_x - E_y$
3. C
   $E_x + E_y$
4. D
   $E_x + E_y + 2\sqrt{E_x E_y}$

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1. A
   $\frac{Qt}{C}$
2. B
   $\frac{Q}{Ct}$
3. C
   $\frac{CQ}{t}$
4. D
   $\frac{Ct}{Q}$

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

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1. A
   33 gram wt.
2. B
   30 gram wt.
3. C
   20 gram wt.
4. D
   15 gram wt.

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1. A
   $3.2 \times 10^{-19}\,\text{J}$
2. B
   $1.6 \times 10^{-19}\,\text{J}$
3. C
   $1.6 \times 10^{-18}\,\text{J}$
4. D
   $0\,\text{J}$

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1. A
   accelerate neutrons.
2. B
   accelerate positively charged particles only.
3. C
   accelerate negatively charged particles only.
4. D
   accelerate positively and negatively charged particles.

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

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1. A
   $mg$
2. B
   $3mg$
3. C
   $5mg$
4. D
   $6mg$

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

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

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1. A
   Propionic acid
2. B
   Oxalic acid
3. C
   Malonic acid
4. D
   Citric acid

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1. A
   $\log_{10} A$
2. B
   $\frac{2.303R}{E_a}$
3. C
   $\frac{-E_a}{2.303R}$
4. D
   $-\log_{10} A$

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1. A
   ICl
2. B
   BrCl
3. C
   BrF
4. D
   ClF

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1. A
   Ammonia
2. B
   Ethylamine
3. C
   Diethylamine
4. D
   Triethylamine

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1. A
   1st
2. B
   3rd
3. C
   7th
4. D
   9th

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1. A
   $0.0136\,\text{cm}^{-1}$
2. B
   $0.0618\,\text{cm}^{-1}$
3. C
   $0.0196\,\text{cm}^{-1}$
4. D
   $0.0731\,\text{cm}^{-1}$

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1. A
   10%
2. B
   30%
3. C
   60%
4. D
   90%

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1. A
   $\text{HClO}_4$
2. B
   $\text{HClO}_2$
3. C
   $\text{HClO}_3$
4. D
   $\text{HCl}$

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