Build a question paper in 60 seconds.

1. A
   6 m
2. B
   12 m
3. C
   $12\sqrt{3}$ m
4. D
   $6\sqrt{3}$ m

Tap an option to check your answer.

1. A
   light travels from denser to rarer medium and $i < i_c$.
2. B
   light travels from rarer to denser medium and $i < i_c$.
3. C
   light travels from denser to rarer medium and $i > i_e$.
4. D
   light travels from rarer to denser medium and $i > i_c$.

Tap an option to check your answer.

1. A
   increases.
2. B
   decreases.
3. C
   remains constant.
4. D
   first decreases, becomes minimum and then increases.

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   2
2. B
   1.5
3. C
   1
4. D
   0.5

Tap an option to check your answer.

1. A
   Same as velocity of sound towards the source.
2. B
   Same as velocity of sound away from the source.
3. C
   Half the velocity of sound towards the source.
4. D
   Twice the velocity of sound towards the source.

Tap an option to check your answer.

1. A
   $\frac{2\mu_0 I}{r}$
2. B
   zero
3. C
   $\frac{\mu_0 I}{4r}$
4. D
   $\frac{\mu_0 I}{2r}$

Tap an option to check your answer.

1. A
   T
2. B
   $T^{-2}$
3. C
   $T^{+2}$
4. D
   $T^{-1}$

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   1.2 A
2. B
   2.4 A
3. C
   4 A
4. D
   4.8 A

Tap an option to check your answer.

1. A
   1.68 mm
2. B
   2.06 mm
3. C
   3.64 mm
4. D
   4.32 mm

Tap an option to check your answer.

1. A
   $\lambda$ is increased to $\sqrt{2}$ times.
2. B
   $\lambda$ is increased to $\frac{1}{\sqrt{2}}$ times.
3. C
   $\lambda$ is decreased to $\frac{1}{\sqrt{2}}$ times.
4. D
   $\lambda$ is decreased to $\sqrt{2}$ times.

Tap an option to check your answer.

1. A
   $\frac{7}{2}$
2. B
   $\frac{7}{3}$
3. C
   5
4. D
   6

Tap an option to check your answer.

1. A
   as a rectifier.
2. B
   for converting light energy to electrical energy.
3. C
   for getting light radiation.
4. D
   for increasing the amplitude of an a.c. signal.

Tap an option to check your answer.

1. A
   $\frac{V^2 - u^2}{a_1 - a_2}$
2. B
   $\frac{v^2 + u^2}{a_1 + a_2}$
3. C
   $\frac{u^2 + V^2}{a_1 - a_2}$
4. D
   $\frac{u^2 - V^2}{a_1 + a_2}$

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   $3 \times 10^{-3}$ s
2. B
   $3 \times 10^{-2}$ s
3. C
   $6 \times 10^{-3}$ s
4. D
   $3 \times 10^{-2}$ s

Tap an option to check your answer.

1. A
   $W_2 = 0$
2. B
   $W_2 = 4W_1$
3. C
   $W_2 < 4W_1$
4. D
   $W_2 = W_1$

Tap an option to check your answer.

1. A
   1.28
2. B
   1.29
3. C
   1.30
4. D
   1.32

Tap an option to check your answer.

1. A
   $(CH_3)_3CHCH_2Br$
2. B
   $(CH_3)_3CBr$
3. C
   (structure image)
4. D
   $CH_3-(CH_2)_2-CH_2Br$

Tap an option to check your answer.

1. A
   surface tension and viscosity
2. B
   mass and temperature
3. C
   internal energy and boiling point
4. D
   heat capacity and specific heat

Tap an option to check your answer.

1. A
   $mvr = \frac{2\pi h}{n}$
2. B
   $mvr = \frac{nh}{2\pi}$
3. C
   $mvh = \frac{n \cdot r}{2\pi}$
4. D
   $mv = \frac{h \cdot r}{2\pi n}$

Tap an option to check your answer.

1. A
   Cu
2. B
   Sc
3. C
   Mn
4. D
   Zn

Tap an option to check your answer.

1. A
   $CH_3 - Cl$
2. B
   $CH_3 - F$
3. C
   $CH_3 - Br$
4. D
   $CH_3 - I$

Tap an option to check your answer.

1. A
   1.97
2. B
   1.79
3. C
   0.242
4. D
   0.557

Tap an option to check your answer.