A body is acted upon by two equal and opposite forces, that are NOT along the same straight line. The body will :

1. remain stationary
2. have only rotational motion
3. have only rectilinear motion
4. have both rectilinear and rotational motion

Which among the following is a vector quantity?

1. work
2. power
3. energy
4. moment of couple

When a ray of light passes from one optical medium to another, which of the following physical quantities does NOT change?

1. Amplitude of the wave
2. Frequency of the wave
3. Wavelength of the wave
4. Speed of the wave

Which one of the following combinations is the correct ascending order of electromagnetic waves in terms of wavelength?

1. Gamma-rays, visible light, microwaves
2. Microwaves, visible light, gamma-rays
3. Gamma-rays, microwaves, visible light
4. Microwaves, gamma-rays, visible light