List of top Physics Questions

Define ‘wavefront’ of a light wave. A plane wavefront is refracted from a convex lens. Draw the shape of the refracted wavefront.
State any three characteristics of electromagnetic waves.
Differentiate between magnetic flux through an area and magnetic field at a point.
How will the magnetic field inside a long solenoid be affected when:
(i) the radius of the turns of the solenoid is increased,
(ii) the length of the solenoid as well as the total number of its turns are doubled?
The electric field of an electromagnetic wave in free space is \[ \vec{E} = \] \[57 \cos \left[7.5 \times 10^6 t - 5 \times 10^{-3} (3x + 4y)\right] \left( 4\hat{i} - 3\hat{j} \right) \, \text{N/C}. \] The associated magnetic field in Tesla is:
A block of mass 5 kg is placed on a frictionless surface and pushed with a force of 20 N at an angle of 30° to the horizontal. What is the acceleration of the block?
Which of the following is a false statement?
G. P. Thomson experimentally confirmed the existence of matter waves by the phenomenon of:
The phenomenon that best supports the theory that matter has a wave nature is:
Direction of conventional current is from:
Among the following statements:

A discharge lamp uses a discharge tube which is filled with a gas at a very low pressure.
Always white light is emitted independent of gas taken in the lamp.
Among identical spheres A and B having charges as \(-5\,\text{C}\) and \(-16\,\text{C}\):
For an object at infinity, a concave mirror produces an image at its focus which is:
According to the laws of reflection:
Which of the following temperatures is the highest?
Buoyant force on an object due to fluid always acts:
A wooden cube floating in water supports a mass \(m = 0.2\,\text{kg}\) on its top. When the mass is removed, the cube rises by \(2\,\text{cm}\). The side of the cube is (density of water \(= 10^3\,\text{kg/m}^3\)):
Which of the following is carried by waves from one place to another?
The acceleration due to gravity:
Which of the following pairs may give equal numerical values of the temperature of human body?
The velocity of sound is largest in:
The motion of the centre of mass depends on:
The force of gravitation between two bodies does not depend on:
The centre of mass of a rigid body lies:
The effect of frictional force may be minimized by: