List of top Physics Questions

A body is projected up with a velocity of $30 \text{ ms}^{-1}$ at an angle of $30^\circ$. The ratio of maximum height reached to the height reached in the first second is ($g = 10 \text{ms}^{-2}$)}

A vector is given as $\vec{A} = 3\hat{j} - 4\hat{k}$. The vector parallel to $\vec{A}$ and magnitude the same as that of the vector $\hat{i} - 2\hat{j}$ is

A car travels half the distance with a velocity of $20 \text{ kmh}^{-1}$ and another half distance with a velocity of $30 \text{ kmh}^{-1}$ along a straight road. The average velocity of the car in $\text{km h}^{-1}$ is

The number of significant figures in $50000.040 \times 10^{-3}$ is

The dimensions of Planck's constant are the same as those of

The mean free path of molecules in an ideal gas A is half that of another ideal gas B. The diameter of the spherical molecules of gas A is twice the diameter of the molecules of gas B. If number densities of the gases A and B are \(n_A\) and \(n_B\), respectively, then

A unit positive point charge is slowly moved through an infinitely thin tube inside a uniformly charged dielectric sphere of radius \(R\) and volume charge density \(\rho\). The initial and final positions of the charge are \(B\) and \(A\), located at distances \(3R\) and \(2R\) respectively from the centre. If the magnitude of work done on the charge is \[ \frac{\rho R^2}{n\varepsilon_0} \] then find \(n\).

A photon and an electron, each of \(10\,\text{eV}\) energy, move in free space. The ratio of linear momentum of electron \(P_e\) to that of photon \(P_{ph}\), \[ \frac{P_e}{P_{ph}} \] is :

Choose the correct statement

1600 atoms of a radioactive substance with a half life period \(T\) start decaying at \(t=0\). The time during which 1550 atoms would have decayed is

For the same kinetic energy, the de Broglie wavelengths associated with particles of different masses are

In the energy band diagram of solids, if the conduction band and the valance band overlap, the solid is

In hydrogen spectral series, the wave numbers of the first Lyman line and the first Balmer line are in the ratio

Two convex lenses of different focal lengths are in contact with each other. If the focal length of each lens is doubled, the focal power of the combination

Two light rays of wavelength \(\lambda\) and \(\frac{\lambda}{4}\) incident on the surface of a photo sensitive material emit electrons with max kinetic energy \(E\) and \(6E\) respectively. The work function of the material is (\(h\) = Planck’s constant, \(c\) = velocity of light in free space)

In Young’s double slit experiment, the screen is placed 1m away from the coherent sources. If the wavelength of light used changes from 500 nm to 600 nm the fringe width increases by 0.25mm. The distance between the slits in mm is

The magnetic susceptibility of a diamagnetic material is

A radio can tune in to any station in the 7.5 MHz to 12 MHz band. The corresponding wavelength band is

The refractive index of the material of a glass prism of refracting angle \(60^\circ\) and angle of minimum deviation \(30^\circ\) is

A pure inductor of self inductance 500 mH is connected to an alternating voltage supply of \(100\sqrt{2}\pi \sin 100\pi t\) volt. The current in the circuit in ampere is

The mutual inductance between a pair of coils is 3 H. If the current in one coil changes from 0 A to 2 A in 0.5 s, the induced emf produced in the other coil is

Two straight parallel conductors of 5 m length each and separated by a distance of 1 cm in free space carry currents of 2A and 3A, respectively, in the same direction. The force per unit length on either of the conductor is

5 equal resistors are combined suitably to get maximum and minimum effective resistances. Their ratio is

A cyclotron accelerates a particle of mass \(m\) and charge \(q\) in a magnetic field \(B\). The cyclotron frequency \(\nu\) is

If the length of a linear conductor is doubled and its area of cross section halved, its resistance is