List of top Physics Questions

The acceleration of a particle which moves along the positive $ x $-axis varies with its position as shown in the figure. If the velocity of the particle is $ 0.8 \, {m/s} $ at $ x = 0 $, then its velocity at $ x = 1.4 \, {m} $ is: \includegraphics[]{83.png}

Two ideal gases A and B of the same number of moles expand at constant temperatures $ T_1 $ and $ T_2 $ respectively such that the pressure of gas A decreases by $ 50% $ and the pressure of gas B decreases by $ 75% $. If the work done by both the gases is the same, then the ratio $ T_1:T_2 $ is:

Two blocks of equal masses are tied with a light string passing over a massless pulley (Assuming frictionless surfaces). The acceleration of the centre of mass of the two blocks is (Given $ g = 10 \, \text{m/s}^2 $):

A diving board is at a height of $ h $ from the water surface. A swimmer standing on this board throws a stone vertically upward with a velocity 16 ms$^{-1}$. It reaches the water surface in a time of 5 s. In the next 0.2s, the diver can hear the sound from the water surface. The speed of sound is (acceleration due to gravity $ g = 10 $ ms$^{-2} $)

A boy throws a ball with a velocity $V_0$ at an angle $\alpha$ to the ground. At the same time, he starts running with uniform velocity to catch the ball before it hits the ground. To achieve this, he should run with a velocity of:

Two objects of masses 2 kg and 5 kg possess velocities $ 10 \hat{i} \, {m/s} $ and $ 3 \hat{i} + 5 \hat{j} \, {m/s} $ respectively. Then the velocity of C.M. in m/s is:

An electron is moving with a velocity $ (2\hat{i} + 3\hat{j}) $ m/s in an electric field $ (3\hat{i} + 6\hat{j} + 2\hat{k}) $ V/m and a magnetic field $ (2\hat{j} + 3\hat{k}) $ T. The magnitude and direction (with x-axis) of the Lorentz force acting on the electron is

The molar specific heat capacity of a diatomic gas at constant pressure is $ C $. The molar specific heat capacity of a monatomic gas at constant volume is

A spring of $ 5 \times 10^3 $ Nm$^{-1} $ spring constant is stretched initially by 10 cm from the unstretched position. The work required to stretch it further by another 10 cm is

In the Young's double slit experiment, the 2nd bright fringe for red light coincides with the 3rd bright fringe for violet light. Then the value of 'n' is: (Given: wavelength of red light = 6300 $\text{Å}$ and wavelength of violet light = 4200 $\text{Å}$)

E, m, L, G represent energy, mass, angular momentum and gravitational constant respectively. The dimensions of \[ \frac{EL^2}{mG^2} \] will be that of

A running man has half the kinetic energy of a boy of half his mass. The man speeds up by $1 \, {m/s}^{-1}$ to have the same kinetic energy as the boy. The initial speed of the man is:

Heat is supplied at constant pressure to a diatomic gas. The part of this heat that was utilized to increase its internal energy is:

A projectile can have the same range $ R $ for two angles of projection. Their initial velocities are the same. If $ T_1 $ and $ T_2 $ are times of flight in two cases, then the product of two times of flight is directly proportional to:

If \[ | \vec{P} + \vec{Q} | = | \vec{P} | = | \vec{Q} |, \] then the angle between $ \vec{P} $ and $ \vec{Q} $ is:

A 4 kg mass is suspended as shown in the figure. All pulleys are frictionless and spring constant $ K $ is $ 8 \times 10^3 $ Nm$^{-1}$. The extension in spring is ( $ g = 10 $ ms$^{-2}$ )

The ratio of the radii of a planet and the earth is $ 1:2 $, the ratio of their mean densities is $ 4:1 $. If the acceleration due to gravity on the surface of the earth is $ 9.8 \, ms^{-2} $, then the acceleration due to gravity on the surface of the planet is?

When an electron placed in a uniform magnetic field is accelerated from rest through a potential difference $ V_1 $, it experiences a force $ F $. If the potential difference is changed to $ V_2 $, the force experienced by the electron in the same magnetic field is $ 2F $, then the ratio of potential differences $ \frac{V_2}{V_1} $ is:

If the vertical component of the earth's magnetic field is 0.45 G at a location, and angle of dip is $ 60^\circ $, then magnetic field of earth at that location is:

A block of metal 4 kg is in rest on a frictionless surface. It was targeted by a jet releasing water of 2 kg/s at a speed of 10 ms$^{-1}$. The acceleration of the block is:

A solid cylinder rolls down on an inclined plane of height $ h $ and inclination $ \theta $. The speed of the cylinder at the bottom is:

In a spring-block system as shown in the figure, if the spring constant $ K = 9 \, \text{N/m} $, then the time period of oscillation is:

A body is executing simple harmonic motion. At a displacement $ x $, its potential energy is $ E_1 $, and at a displacement $ y $, its potential energy is $ E_2 $. The potential energy $ E $ at a displacement $ (x + y) $ is:

A particle is projected from the surface of the Earth with a velocity equal to twice the escape velocity. When the particle is far from the Earth, its speed will be:

A 4 kg stone is attached to a steel wire being whirled at a constant speed of $ 12 $ m/s in a horizontal circle. The wire is 4 m long with a diameter of 2 mm, and Young’s modulus is $ 2 \times 10^{11} $ Nm$^2$. The strain in the wire is: