Physics Test-37...

Due to an acceleration of \(2 m / s ^{2}\), the velocity of a body increases from \(20 m / s\) to \(30 m / s\) in a certain period. Find the displacement (in \(m\) ) of the body in that period.

When compact disk is illuminated by a source of white light, coloured lines are observed. This is due to:

If the momentum of a body is constant, then:

Which of the following processes exhibit external mechanical Irreversibility?

An athlete in the Olympic games covers a distance of \(100 \mathrm{~m}\) in \(10 \mathrm{~s}\). His kinetic energy can be estimated to be in the range. (Assume weight = \(60kg\))

A beam of light of wavelength \(600\) mm from a distant source falls on a single slit \(1.0\) mm wide and the resulting diffraction pattern is observed on a screen \(2\) m away. The distance between the first dark fringes on either side of the central bright fringe is:

The force per unit length is 10^-3 N on the two current-carrying wires of equal length that are separated by a distance of 2 m and placed parallel to each other. If the current in both the wires is doubled and the distance between the wires is halved, then the force per unit length on the wire will be:

A circular road of 1000 m radius has a banking angle of 45°, the maximum safe speed of a car having a mass of 2000 kg will be (if the coefficient of friction between tyre and road is 0.5):

Unit of thermal conductivity in S.I. units is:

A simple pendulum has a time period of T, if the mass of the bob is made one fourth, then the time period of the pendulum will become: