List of top Physics Questions

The time period of oscillation of a magnet in a vibrationmagnetometer is 1.5 sec. The time period of oscillation of another magnet similar in size, shape and mass but having 1/4 magnetic moment than that of the 1 st magnet oscillating at the same place will be

Two particles A and B of equal masses are suspended from two massless springs constants \(k_1,\) and\( k_2,\) respectively. If the maximum velocities, during oscillation, are equal, the ratio of amplitude of A and B is

The length of a second's pendulum at the surface of earth is 1 m. The length of second's pendulum at the surface of moon where g is \(\frac{1}{6}^{th}\) that at earth's surface is

Radio waves and visible light in vacuum have

The energy of a hydrogen atom in the ground state is \(-13.6 eV.\) The energy of \(He^+\) ion in the first excited state will be

The ionization energy of hydrogen atom is 13.6 eV. Following Bohr's theory, the energy corresponding to a transition between 3rd and 4th orbit is

A man is watching two trains, one leaving and the other coming in with equal speeds of 4m/sec. If they sound their whistles, each of frequency 240 Hz, the number of beats heard by the man (velocity of sound in air = 320 m/sec) will be equal to

A band playing music at frequency f is moving towards a wall at a speed \(v_b\). A motorist is following the band with a speed \(v_m\). If v is the speed of sound, the expression for the beat frequency heard by the motorist is

A plane electromagnetic wave travels in free space along x-axis. At a particular temperature point in space, the electric field along y-axis is \(9.3V m^{-1}\). The magnetic induction (B) along z-axis is

A radioactive element forms its own isotopes after three consecutive disintegrations. The particles emitted are

Fusion reactions take place at high temperature because

If \(N_0\) is the original mass of the substance of half-life period \( t_{\frac12} = 5\) years, then the amount of substance left after 15 years is

Lenz law is based in principle of conservation of:

Which of the following parameters is the same for all hydrogen-like atoms and ions in their ground states?

When hydrogen atom is in its first excited level, it's radius is

A man moving with 2 m/s of 75 kg in west and another man of 50 kg is moving at 4 m/s in north collides in elastically and move together. Find final direction of motion:

If balls collides elastically with fixed wedge and travels horizontally. Find h/H for maximum horizontal range:

Find resonance frequency in the given circuit:

If a ball of mass 0.1 kg hits the ground from the height of 20 m and bounce back to the same height then find out the force exerted on the ball if the time of impact is 0.04 sec (g = 10 m/s2)

If frequency of a photon is\( 6×10^4 Hz\), then find its wavelength[speed of light, \(C= 3×10^8 m/s\)]

A projectile of man 1 kg is projected with a speed of 10 m/s at an angle of 60° from the horizontal when projectile is at its highest point, its magnitude of angular momentum (about point of projection):

2 wire of same material having radius in ratio 2:1 and lengths in ratio 1:2. If same force is applied on them, then ratio of their change in length will be:

Ratio of charge on postern to mass of positron isapproximately.

A man applying force of 20 Non an object at an angle of 60° from the horizontal direction then work done by the force on the object is-

A galvanometer of 50 \(\Omega\) resistance has 25 division. A current of \(4×10^{-4} A\) gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of: