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1. A
   $\\\frac{1}{10}$
2. B
   $\\\frac{3}{10}$
3. C
   $\\\frac{7}{100}$
4. D
   $\\\frac{9}{100}$

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1. A
   $\\\frac{1}{a^2}-\\\frac{1}{b^2}=\\\frac{1}{c}$
2. B
   $\\\frac{1}{a^2}+\\\frac{1}{b^2}=\\\frac{1}{c}$
3. C
   $\\\frac{1}{a^2}+\\\frac{1}{b^2}=\\\frac{1}{c^2}$
4. D
   $\\\frac{1}{a^2}-\\\frac{1}{b^2}=\\\frac{1}{c^2}$

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

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1. A
   Statement 2 is contrapositive of statement 1.
2. B
   Statement 2 is negation of statement 1.
3. C
   Statement 2 is inverse of statement 1.
4. D
   Statement 2 is the converse of statement 1.

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

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1. A
   $\frac{37}{21}$
2. B
   $\frac{27}{35}$
3. C
   $\frac{21}{25}$
4. D
   $\frac{35}{27}$

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1. A
   $\frac{v^{2}d}{gh}$
2. B
   $\frac{2v^{2}g}{dh}$
3. C
   $\frac{gd}{2v^{2}h}$
4. D
   $\frac{v^{2}}{2ghd}$

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1. A
   $8\,\mu F$
2. B
   $4\,\mu F$
3. C
   $2\,\mu F$
4. D
   $16\,\mu F$

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

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1. A
   $\frac{\pi a}{T}$
2. B
   $\frac{3\pi^{2}a}{T}$
3. C
   $\frac{\pi a\sqrt{3}}{T}$
4. D
   $\frac{\pi a\sqrt{3}}{2}$

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1. A
   $\frac{1-\gamma}{1+\gamma}$
2. B
   $\frac{1+\gamma}{1-\gamma}$
3. C
   $\frac{\gamma-1}{R}$
4. D
   $\frac{R}{\gamma-1}$

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1. A
   2.5 mA
2. B
   7.5 mA
3. C
   250 mA
4. D
   750 mA

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1. A
   $F_{1}=F_{2}$
2. B
   $F_{1}=-F_{2}$
3. C
   $F_{1}=2F_{2}$
4. D
   $F_{1}=\frac{1}{2}F_{2}$

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1. A
   6 cm
2. B
   8 cm
3. C
   10 cm
4. D
   12 cm

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1. A
   focal power
2. B
   focal length
3. C
   magnifying power
4. D
   linear magnification

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1. A
   NAND gate
2. B
   OR gate
3. C
   XOR gate
4. D
   NOT gate

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

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

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1. A
   $9\times10^{-6}\,\text{J}$
2. B
   $16\times10^{-6}\,\text{J}$
3. C
   $40\times10^{-6}\,\text{J}$
4. D
   $80\times10^{-6}\,\text{J}$

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1. A
   $\lambda_{1}=\lambda_{2}+\lambda_{3}$
2. B
   $\lambda_{2}=\lambda_{1}+\lambda_{3}$
3. C
   $\frac{1}{\lambda_{1}}=\frac{1}{\lambda_{2}}-\frac{1}{\lambda_{3}}$
4. D
   $\frac{1}{\lambda_{1}}-\frac{1}{\lambda_{2}}=\frac{1}{\lambda_{3}}$

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1. A
   $n$ only
2. B
   $I$ only
3. C
   $r$ only
4. D
   $n$, $I$ and $r$

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

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

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1. A
   9
2. B
   12
3. C
   15
4. D
   $\frac{9}{17}$

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

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