List of top Physics Questions

If an ideal heat engine with an efficiency of $40\%$ rejects heat at $27^\circ$C, then it should have absorbed heat at

For a particle executing simple harmonic motion with amplitude $A$ and time period $T$ along x-axis, the time taken by the particle to move from $x = 0$ to $x = A$ is

With Laplace correction in Newton’s formula for the velocity of sound in gases, the velocity of sound in monoatomic gas at STP is

If the temperature $T$ of oxygen molecule is raised to $9T$, then its root mean square speed $v$ is increased to

If a huge tank has a small side hole at a depth of $2$ m from the surface of water, then the velocity of water flowing through the hole is ($g = 10\ \text{m s}^{-2}$)

The force required to increase the length of a thin copper wire of cross-sectional area \(0.1\ \text{cm}^2\) by \(0.1\%\) is (Young’s modulus of copper is \(11 \times 10^{10}\ \text{N m}^{-2}\))

If the temperature of $2$ moles of krypton gas is increased from $-11^\circ$C to $89^\circ$C at constant volume, then (specific heat at constant volume of krypton is $C_V$)

The ratio of the weights of an object of mass $m$ at a height $R$ and $2R$ from the surface of earth is ($R$ is the radius of earth)

If the magnitude of gravitational potential energy of an object of mass $200$ kg at a height of $3.6 \times 10^6$ m from the earth surface is $6 \times 10^6$ J then its value at a height of $5.6 \times 10^6$ m is (Radius of earth is $6.4 \times 10^6$ m)

Lakes and ponds freeze at the top surface with water below. This phenomenon is due to

A swimmer jumps from a height is able to increase the number of loops made in air by

If a proton, a deuteron and an $\alpha$-particle have the same speed, then the kinetic energy is

If the maximum acceleration of a moving platform to keep a box of mass \(5\) kg on it without sliding is \(3\ \text{m s}^{-2}\), then the static friction between the box and floor of the platform is (\(g = 10\ \text{m s}^{-2}\))

A body initially at rest breaks up into two pieces of masses $M$ and $3M$ and move with a total kinetic energy of $E$, then the kinetic energy of the piece of mass $M$ is

If \(10\) identical silver coins each of mass \(m\) are placed one over the other, then force on the \(6^{\text{th}}\) coin from the bottom is

The moment of inertia of a system of two masses $2$ kg and $4$ kg lying in the x-y plane at distances, $2$ m and $4$ m, respectively from the origin about the z-axis is (in $\text{kg m}^2$)

If the position vector of a particle is \(\vec{r} = 2t\hat{i} + \sqrt{3}t^2\hat{j} + 5\hat{k}\) with \(\vec{r}\) in m and \(t\) in s, then at \(t = 1\) s the angle made by the velocity vector with x-axis is

Taking into consideration of significant figures, in the conversion relation \(2.0\ \text{m s}^{-2} = X\ \text{km h}^{-2}\), the value of \(X\) is

A physical quantity that has the same dimensions as those of Boltzmann constant is

A body starts moving from the origin along a straight line at a speed of \(20\ \text{km h}^{-1}\) for \(1\) hour. Then it turns perpendicular to its path and moves with the same velocity for \(30\) minutes. Then the magnitude of its displacement is

If the angular speed of a particle moving in a circular path of radius \(1.2\) m is increased from \(2\ \text{rad s}^{-1}\) to \(4\ \text{rad s}^{-1}\) keeping its radius constant, then its linear speed is increased by

In a Young's Double Slit Experiment, if the distance between the slits is halved and the distance to the screen is doubled, what happens to the fringe width?

What is the frequency of a wave with a speed of \(30\,m/s\) if the distance between 11 consecutive crests is \(1\,m\)?

A capacitor of \(10\,\mu F\) is charged to \(100V\). Find the energy stored in it.

A particle performs SHM with an amplitude of 5 cm. Find its acceleration when it is 3 cm from the mean position (assume \( \omega = 2 \, \text{rad/s} \)).