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1. A
   $\frac{1}{\sqrt{2}}$
2. B
   $\frac{2}{\sqrt{5}}$
3. C
   $\frac{2}{\sqrt{10}}$
4. D
   $\frac{2}{\sqrt{15}}$

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1. A
   $\frac{3\lambda_1}{\lambda_2}$
2. B
   $\frac{3\lambda_2}{\lambda_1}$
3. C
   $\frac{\lambda_1}{3\lambda_2}$
4. D
   $\frac{\lambda_2}{3\lambda_1}$

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1. A
   linear velocity always radial to the circular path, without change in its magnitude
2. B
   linear velocity always tangential to the circular path, without change in its magnitude
3. C
   linear acceleration always tangential to the circular path
4. D
   linear acceleration always along the axis of the circular path

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1. A
   $\frac{2\varepsilon_0^2 n^2 h^2}{me^4}$
2. B
   $\frac{4\varepsilon_0^2 n^2 h^2}{me^2}$
3. C
   $\frac{4\varepsilon_0^2 n^3 h^3}{me^4}$
4. D
   $\frac{4\varepsilon_0 n^2 h^2}{\pi me^2}$

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1. A
   $P$
2. B
   $2P$
3. C
   $3P$
4. D
   $4P$

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1. A
   c, b
2. B
   a, 0
3. C
   d, c
4. D
   f, e

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1. A
   $\frac{1}{4}C\left(V_1^2+V_2^2\right)$
2. B
   $\frac{1}{4}C\left(V_1^2-V_2^2\right)$
3. C
   $\frac{1}{4}C\left(V_1+V_2\right)^2$
4. D
   $\frac{1}{4}C\left(V_1-V_2\right)^2$

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1. A
   $R^{3/2}$
2. B
   $R^{3/5}$
3. C
   $R^{7/2}$
4. D
   $R^{7/4}$

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1. A
   $(\rho_2+\sigma):(\rho_1-\sigma)$
2. B
   $(\rho_1+\sigma):(\rho_2-\sigma)$
3. C
   $(\rho_2-\sigma):(\rho_1-\sigma)$
4. D
   $(\rho_1-\sigma):(\rho_2-\sigma)$

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

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1. A
   $r=\frac{2}{\sqrt{5}-2}$ right to pt. B
2. B
   $r=\frac{2}{\sqrt{5}-2}$ left to pt. A
3. C
   $r=\frac{2}{\sqrt{5}+2}$ right to pt. B
4. D
   $r=\frac{2}{\sqrt{5}+2}$ left to pt. A

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1. A
   Wavelength increased two times
2. B
   Wavelength decreased to half
3. C
   Wavelength increased four times
4. D
   Wavelength remains the same

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1. A
   antinodes at both ends and at least one node in between
2. B
   Nodes at both ends and at least one antinode in between
3. C
   Nodes at both ends and no antinode in between
4. D
   antinodes at both ends and no node in between

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1. A
   decreases
2. B
   increases
3. C
   remains same
4. D
   first increases and then decreases

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

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

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1. A
   voltage regulator, diode rectifier, filter.
2. B
   diode rectifier, voltage regulator, filter.
3. C
   diode rectifier, filter, voltage regulator.
4. D
   filter, voltage regulator, diode rectifier.

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1. A
   4 times
2. B
   2 times
3. C
   half times
4. D
   $\frac{1}{4}$th times

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1. A
   Crotonyl alcohol
2. B
   Resorcinol
3. C
   Ethylene glycol
4. D
   Quinol

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1. A
   $2.44\times10^{-23}\,\text{cm}^3$
2. B
   $5.86\times10^{-23}\,\text{cm}^3$
3. C
   $3.68\times10^{-23}\,\text{cm}^3$
4. D
   $4.76\times10^{-23}\,\text{cm}^3$

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1. A
   1-Methoxypropane
2. B
   1-Ethoxypropane
3. C
   Methoxyethane
4. D
   Ethoxyethane

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1. A
   $5.6\,\text{dm}^3$
2. B
   $16.8\,\text{dm}^3$
3. C
   $22.4\,\text{dm}^3$
4. D
   $33.6\,\text{dm}^3$

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1. A
   $0.1\,\text{mol dm}^{-3}\text{ minute}^{-1}$
2. B
   $0.2\,\text{mol dm}^{-3}\text{ minute}^{-1}$
3. C
   $0.3\,\text{mol dm}^{-3}\text{ minute}^{-1}$
4. D
   $0.4\,\text{mol dm}^{-3}\text{ minute}^{-1}$

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1. A
   $22.4\,\text{dm}^3$
2. B
   $5.6\,\text{dm}^3$
3. C
   $11.2\,\text{dm}^3$
4. D
   $7.46\,\text{dm}^3$

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1. A
   Solid in liquid
2. B
   Gas in liquid
3. C
   Solid in gas
4. D
   Solid in solid

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