List of top Physics Questions

For a particle of a purely rotating body, $v=r\omega $ , so correct relation will be

For a particle moving in a straight line, the displacement of the particle at time $t$ is given by $S=t^{3}-6t^{2}+3t+7$ . The velocity of the particle when its acceleration zero is

Digital circuits can be made with the repetitive use of

In Young’s double slit experiment, the central point on the screen is:

In Young’s double slit experimental setup, if the wavelength alone is doubled, the bandwidth \( \beta \) becomes:

Tube A has both ends open while tube B has one end closed, otherwise they are identical. The ratio of fundamental frequency of tube A and B is:

When a system is taken from state i to state f along the path iaf, it is found that \( Q = 50 \, \text{cal} \) and \( W = 20 \, \text{cal} \). Along the path ibf, \( Q = 36 \, \text{cal} \). W along the path ibf is:

If the differential equation for a simple harmonic motion is \( \frac{d^2 y}{dt^2} + 2y = 0 \), the time-period of the motion is:

The work done by an uniform magnetic field, on a moving charge is:

The current in the 1\(\Omega\) resistor shown in the circuit is:

A and B are two wires. The radius of A is twice that of B. They are stretched by the same load. Then the stress on B is:

A block of mass 5 kg resting on a horizontal surface is connected by a cord, passing over a light frictionless pulley to a hanging block of mass 5 kg. The coefficient of kinetic friction between the block and the surface is 0.5. Tension in the cord is:

A solid cylinder of mass \( m \) and radius \( R \) rolls down an inclined plane without slipping. The speed of its C.M. when it reaches the bottom is:

The surface of a metal is illuminated with the light of 400 nm. The kinetic energy of the ejected photoelectrons was found to be 1.68 eV. The work function of the metal is: (hc = 1240 eV·nm)

A liquid is allowed to flow into a tube of truncated cone shape. Identify the correct statement from the following.

A planet revolves in an elliptical orbit around the sun. The semi-major and semi-minor axes are \( a \) and \( b \). Then the square of the time period, \( T \), is directly proportional to:

In an electromagnetic wave:

A metal ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is:

Escape velocity when a body of mass \( m \) is thrown vertically from the surface of the earth is \( v \). What will be the escape velocity of another body of mass 4m thrown vertically?

A man holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally in 5 sec. Each bullet has a mass 10 g with a muzzle velocity of 800 m/s. The velocity which the rifle man attains after firing 10 shots will be:

A particle having a mass 0.5 kg is projected under gravity with a speed of 98 m/s at an angle of \( 60^\circ \). The magnitude of the change in momentum (in N-sec) of the particle after 10 seconds is:

A particle covers half of the circle of radius \( r \). Then the displacement and distance of the particle are respectively:

For a series RLC circuit \( R = X_L = 2X_C \). The impedance of the circuit and phase difference between \( V \) and \( I \) respectively will be:

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping the mass the same, which one of the following will not be affected?

A rain drop of radius 0.3 mm has a terminal velocity in air is 1 m/s. The viscosity of air is \( 8 \times 10^{-5} \) poise. The viscous force on it is: