A wire clamped at both ends is struck in the middle. It will possess :

1. rotational kinetic energy
2. translation kinetic energy
3. vibrational kinetic energy 
4. none of these

The velocity of a moving cart is reduced to $\dfrac{1}{3}$rd the initial velocity. Its kinetic energy is reduced by :

1. $\dfrac{1}{2}$

2. $\dfrac{1}{3}$

3. $\dfrac{1}{6}$

4. $\dfrac{1}{9}$

On doubling the velocity of a moving body, the quantity which gets double is:

1. acceleration
2. momentum
3. kinetic energy 
4. weight

In a photoelectric cell, the change in energy is from:

1. electrical to mechanical
2. light energy to electrical energy
3. electrical energy to light energy
4. chemical energy to light energy