Which one of not a primary macro

A body of mass 3 kg has a velocity of 4 m/s. Find its kinetic energy.  

The ratio of the total distance traveled by a body to the total time taken is its:

A 10 μF capacitor is charged to 100 V. The energy stored in the capacitor is:

What is the main difference between alternating current (AC) and direct current (DC)?  

What is the speed of sound in air at room temperature (20°C)?  

A plane mirror is placed on a wall. A man walks directly toward the mirror at 2 m/s. The speed at which his image approaches him is:

Rain drops acquire spherical shape due to -

Which of the following is an example of longitudinal waves in a gas medium?

The ratio of the amplitudes of the electric field and magnetic field strengths has the same dimensions as that of:

A 220 V, 50 Hz AC supply is connected across a coil of resistance 10 Ω and inductance 0.1 H. Calculate the power consumed in the coil.