1. A
   100 days
2. B
   105 days
3. C
   115 days
4. D
   108 days

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1. A
   $\frac{he}{\pi m}$
2. B
   $\frac{he}{2\pi m}$
3. C
   $\frac{heB}{\pi m}$
4. D
   $\frac{heB}{2\pi m}$

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

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1. A
   2.66
2. B
   2.33
3. C
   1.60
4. D
   1.33

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1. A
   9 min, 40 km/h
2. B
   25 min, 100 km/h
3. C
   10 min, 90 km/h
4. D
   15 min, 120 km/h

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1. A
   100 N
2. B
   $100\sqrt{3}$ N
3. C
   200 N
4. D
   $200\sqrt{3}$ N

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1. A
   $\omega(t)$ increasing, $A(t)$ constant
2. B
   $\omega(t)$ increasing, $A(t)$ decreasing
3. C
   $\omega(t)$ increasing, $A(t)$ increasing
4. D
   $\omega(t)$ decreasing, $A(t)$ decreasing

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1. A
   $a = \frac{1}{2}, \alpha = \frac{1}{2}, \beta = -1, \gamma = +1, \delta = \frac{3}{2}$
2. B
   $a = -\frac{1}{2}, \alpha = -\frac{1}{2}, \beta = -1, \gamma = -\frac{1}{2}, \delta = \frac{5}{2}$
3. C
   $a = -\frac{1}{2}, \alpha = -\frac{1}{2}, \beta = -1, \gamma = \frac{1}{2}, \delta = \frac{7}{2}$
4. D
   $a = \frac{1}{2}, \alpha = \frac{1}{2}, \beta = -\frac{1}{2}, \gamma = \frac{1}{2}, \delta = \frac{7}{2}$

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1. A
   5.18 cm
2. B
   5.08 cm
3. C
   4.98 cm
4. D
   5.00 cm

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1. A
   Zero at all places
2. B
   Constant between the plates and zero outside the plates
3. C
   Non-zero everywhere with maximum at the imaginary cylindrical surface connecting peripheries of the plates
4. D
   Zero between the plates and non-zero outside

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1. A
   Reflected light is completely polarized and the angle of reflection is close to 60$^\circ$
2. B
   Reflected light is partially polarized and the angle of reflection is close to 30$^\circ$
3. C
   Both reflected and transmitted light are perfectly polarized with angles of reflection and refraction close to 60$^\circ$ and 30$^\circ$, respectively
4. D
   Transmitted light is completely polarized with angle of refraction close to 30$^\circ$

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1. A
   $\frac{3F}{5}$
2. B
   $\frac{2F}{3}$
3. C
   $\frac{F}{2}$
4. D
   $\frac{3F}{8}$

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1. A
   1.3 atm
2. B
   1.6 atm
3. C
   1.4 atm
4. D
   1.8 atm

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1. A
   $r \propto n^{1/3};\ v \propto n^{1/3}$
2. B
   $r \propto n^{1/3};\ v \propto n^{2/3}$
3. C
   $r \propto n^{2/3};\ v \propto n^{1/3}$
4. D
   $r \propto n^{4/3};\ v \propto n^{-1/3}$

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1. A
   88 earth days
2. B
   225 earth days
3. C
   172 earth days
4. D
   124 earth days

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1. A
   16 N
2. B
   27 N
3. C
   32 N
4. D
   36 N

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1. A
   $\frac{R}{64}$
2. B
   $\frac{R}{32}$
3. C
   $\frac{R}{16}$
4. D
   $\frac{R}{8}$

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1. A
   0.067 nm
2. B
   0.67 nm
3. C
   1.67 nm
4. D
   2.67 nm

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1. A
   0.8 J
2. B
   1.0 J
3. C
   1.2 J
4. D
   1.5 J

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1. A
   1.5 A
2. B
   2.0 A
3. C
   2.5 A
4. D
   3.0 A

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1. A
   $\sqrt{\frac{E}{2m}}$
2. B
   $c\sqrt{2mE}$
3. C
   $c\sqrt{\frac{2m}{E}}$
4. D
   $\frac{1}{c}\sqrt{\frac{E}{2m}}$

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

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1. A
   $\frac{7}{8}$
2. B
   $\frac{7}{40}$
3. C
   $\frac{7}{57}$
4. D
   $\frac{7}{64}$

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1. A
   $D_1$ is forward biased, $D_2$ is reverse biased
2. B
   $D_1$ is reverse biased, $D_2$ is forward biased
3. C
   $D_1$ and $D_2$ both are forward biased
4. D
   $D_1$ and $D_2$ both are reverse biased

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

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