List of top Physics Questions

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
5 equal resistors are combined suitably to get maximum and minimum effective resistances. Their ratio is
The temperature coefficient of resistance of a coil of wire of resistance \(4 \Omega\) at \(30^\circ\text{C}\) and \(6 \Omega\) at \(70^\circ\text{C}\) (in per \(^\circ\text{C}\)) is
A moving coil galvanometer of coil resistance 12 ohms shows full scale deflection for a current of 3 mA. It can be converted into a voltmeter of range 0-18 V by connecting
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
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
Two positive charges of +Q each are placed at the corners A and B of an equilateral triangle ABC of side R. The net electric potential at C, in terms of K is (\(K = \frac{Q}{4\pi\epsilon_0 R}\))
An electric dipole of dipole moment \(12\mu \text{ C m}\) is suspended in a uniform electric field of intensity \(10^6 \text{Vm}^{-1}\). The work done in rotating it from \(0^\circ\) to \(60^\circ\) with respect to the field direction is
When a parallel combination of 2 capacitors of 100 pF each is connected across a series combination of 2 capacitors of 200 pF each, the effective capacitance is
Which of the following equations represents a simple harmonic motion? (\(x\) is displacement and \(a\) is acceleration)
Two point charges $q_1=4\mu C$ and $q_2=-4\mu C$ are located 40 cm apart in free space. The electric field at the mid point of the line joining $q_1$ and $q_2$ is
The speed of the transverse waves on a steel wire of length 50 cm and mass 5 g subjected to a tension of 64 N is
The average kinetic energy of a gas molecule is directly proportional to
One litre of an ideal gas at a pressure of 50 pascal is suddenly compressed to half its original volume. The final pressure of the gas in pascal is (\(\gamma = 1.5\))
The heat required to convert 2 kg of ice at -10$^\circ$ C to water at 10$^\circ$ C at standard atmospheric pressure is (specific heat capacity of ice = 2100 Jkg$^{-1}$ K$^{-1}$, specific heat capacity of water = 4200 Jkg$^{-1}$ K$^{-1}$, Latent heat of fusion of ice = $3.35 \times 10^5$ Jkg$^{-1}$)
The \(\gamma \left( = \frac{C_p}{C_v} \right)\) values of a rigid diatomic gas molecule and a monoatomic gas molecule are in the ratio
In a carnot engine, the ratio of the heat rejected to the sink to the heat absorbed from the source is 1 : 4. If this ratio is changed to 1: 2, the change in engine efficiency is
Two masses 2 kg and 6 kg lie on the x-axis at distances of 3 m and 6 m, respectively, from the origin. The distances of the centre of mass of the system from the origin and from the 2 kg mass are in the ratio
Two planets revolve around the sun in elliptical orbits with their major axes in the ratio 2 : 3. Their periods of revolution around the sun are in the ratio
A steel rod of 1 m length and 10\(^{-3}\) m\(^2\) area of cross section is subjected to a linear force of 150 kN. The elongation of the rod is (Young’s modulus of steel \(1.5 \times 10^{11} \text{ Nm}^{-2}\))
The terminal velocity of a steel ball of radius r and density \(\rho\) falling through an oil column of density \(\sigma\) and viscosity \(\eta\) is
A thin circular disc and a uniform thin circular ring have their masses and radii in the ratio 2 : 1 and 1 : 2 respectively. The ratio of their moments of inertia about their respective diameters is
The values of the acceleration due to gravity at depths of \(\frac{R}{2}\) and \(\frac{2R}{3}\) from the surface of the earth are in the ratio
A bullet of mass 0.05 kg entering a heavy wooden block with a speed of 100 ms\(^{-1}\) is stopped in a distance of 50 cm. The average resistive force exerted by the block on the bullet is