List of top Physics Questions

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 \(11 \times 10^{10}\ \text{N m}^{-2}\))

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 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 ($g = 10\ \text{m s}^{-2}$)

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)

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

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 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 (\(g = 10\ \text{m s}^{-2}\))

If a proton, a deuteron and an $\alpha$-particle have the same speed, then the kinetic energy 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 $\text{kg m}^2$)

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

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

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

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

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

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

A particle performs linear S.H.M. with potential energy \(U = 0.1\pi^2 x^2\). If the mass is \(20\,g\), what is its frequency?

Following are statements of a few processes taking place in nature.
I. Free expansion of a gas
II. The combustion of a mixture of petrol and air ignited by a spark
III. The leaking of gas from the kitchen cylinder
IV. The transfer of heat from one heated part of a liquid to the other colder part
Which amongst these processes are irreversible in nature?

A source of frequency \( \nu \) gives 6 beats/second when sounded with a source of frequency 200 Hz. The second Harmonic of frequency \( 2\nu \) of the source gives 8 beats/second when sounded with a source of frequency 420 Hz. The value of \( \nu \) is

A mass of 1 kg is executing SHM. Its displacement is given by \( x = 6.0 \cos(100t + \pi/4) \) cm. What is the maximum kinetic energy?

The graph of pressure P and volume V of 1 mole of an ideal gas at constant temperature is

In thermodynamic processes, which of the following statements is not true?

In a capillary tube experiment, a vertical 30 cm long capillary tube is dipped in water, water rises upto a height of 10 cm due to capillarity. If this experiment is conducted in a freely falling elevator, then the length of the water column becomes

There are two wires of same material and same length while the diameter of second wire is two times the diameter of the first wire. Then the ratio of extensions produced in the wires by applying same load will be

Instrument fitted in the carburetor of the automobile to provide the correct mixture of air and fuel necessary for combustion works on