List of top Physics Questions

A man weighing 50 kg is in a lift moving down with an acceleration of $2.8 m s^{-2}$. The force exerted by the floor on him is:

If force, $F=kv^{n}$ (k is constant) and power delivered is independent of velocity 'v', then n equals to:

A particle under constant acceleration covers the first half of the total distance in time $t_1$ and remaining in time $t_2$. Then:

For a convex lens, magnifications m_1 and m_2 correspond to object distances u_1 and u_2. The focal length is:

In an electromagnetic wave in vacuum, the relation between peak electric field E_0 and magnetic field B_0 is:

The electric potential at a point on the axis of an electric dipole at a distance r from its center is proportional to:

Doping a semiconductor with a trivalent impurity results in:

In a nuclear reactor, heavy water (D_2O) is used as a moderator. Its main function is to:

Three capacitors of capacitances \(2\,\mu F\), \(3\,\mu F\), and \(6\,\mu F\) are connected in series. The equivalent capacitance is:

The threshold frequency for a certain photosensitive metal surface is _0. When light of frequency 2_0 is incident on the surface, the maximum velocity of the emitted photoelectrons is v_1. If the frequency is increased to 5_0, the maximum velocity becomes v_2. The ratio v_1 : v_2 is:

A wire of resistance R is stretched uniformly to double its original length. The new resistance will be:

The energy of a particle executing Simple Harmonic Motion (SHM) is given by E = Ax^2 + BV^2. Here 'x' is the displacement of the particle from its mean position, 'V' is its velocity at 'x', and A and B are positive constants. The maximum velocity of the particle is:

The fundamental frequency of a closed organ pipe of length L is equal to the frequency of the first overtone of an open organ pipe of length L'. The relation between their lengths is:

The structural characteristics of Simple Harmonic Motion (SHM) require that the acceleration of a particle is directly proportional to its displacement from the mean position and is directed:

The displacement of a progressive wave is given by \( y = 0.5 \sin(100t - 2x) \), where x and y are in meters and t is in seconds. The velocity of the wave is:

If the absolute temperature of a black body is tripled, the total radiant energy emitted per second per unit area increases by a factor of:

Two sound waves having wavelengths 5.0 m and 5.5 m respectively produce 10 beats per second when propagating in a gas. The velocity of sound in the gas is:

A planet revolves around the Sun in an elliptical orbit. The areal velocity of the planet is \(4 \times 10^{16}\,\text{m}^2\text{s}^{-1}\). If the maximum distance between the planet and the Sun is \(4 \times 10^{12}\,\text{m}\), then the minimum speed of the planet is:

The temperature of a given mass of an ideal gas is changed from 27^ to 327^ at constant pressure. If the initial volume of the gas is V, then its final volume will be:

The equation of a simple harmonic progressive wave is given by y = 0.05 (100 t - 0.4 x), where x and y are in meters and t is in seconds. The wave velocity is:

The terminal velocity v of a small spherical ball of radius r falling through a viscous liquid is directly proportional to:

A string of mass 2.5 kg is under a tension of 200 N. The length of the stretched string is 20 m. If a transverse jerk is struck at one end of the string, the time taken for the disturbance to reach the other end is:

The mean free path of a gas molecule of diameter d and number density n (number of molecules per unit volume) is inversely proportional to:

Equal masses of two substances of densities _1 and _2 are mixed. Density of mixture is:

Work done in stretching a wire of length L, area A, Young's modulus Y by x is: