List of top Physics Questions

The axial field \( B_A \) and equatorial field \( B_E \) due to a short bar magnet at equal distances are related as:
In the circuit with 6 V battery and resistors of 2Ω each, current is 2 A. Find potential at B with respect to A.
circuit with 6 V battery and resistors of 2 each
Electron of charge \( e \) moves in hydrogen atom (radius \( r \)). Coulomb force between nucleus and electron is:
(Here \( K = \frac{1}{4 \pi \varepsilon_0} \))
A flexible wire loop carrying current is placed in external magnetic field. Its shape becomes:
A vessel withstands 100 atm. It's filled with hydrogen at 27°C (300 K) to 20 atm. Find temp. at which pressure becomes 100 atm.
The relation between absolute temperature (T) and pressure (P) in adiabatic process is:
If average KE of gas molecule at \( 27^\circ C \) is \( 3.3 \times 10^{-20} \, \text{J} \), find KE at \( 127^\circ C \):
A particle initially at the mean position is executing simple harmonic motion with an angular frequency \( \frac{\pi}{4} \, \text{rad/s} \). The ratio of the distances travelled by the particle in the first second and second second is:
A rectangular metallic block of size \( 40 \, \text{mm} \times 20 \, \text{mm} \) is pulled with a force of \( 50 \, \text{kN} \). The strain in the block is:
(Shear modulus \( = 40 \times 10^9 \, \text{Nm}^{-2} \))
A body moves with uniform speed of \( 20 \text{ ms}^{-1} \) in a horizontal circle. What is the change in velocity after half revolution?
A motor vehicle of mass 1000 kg is moving on a circular road having banking angle \( 30^\circ \) and coefficient of friction 0.2. Then the normal reaction force on the motor vehicle is about:
(Acceleration due to gravity = \( 10 \, \text{ms}^{-2} \))
Force is the mutual interaction between bodies according to:
A 2 kg stone is tied to a 2 m long string and whirled in a circle. If the maximum tension is 64 N, what is the max number of revolutions per minute?
The dimensional formula of a physical quantity represented by \( \frac{e^2}{4 \varepsilon_0 h} \) is:
Where \( e \) is the charge of the electron, \( \varepsilon_0 \) is the permittivity of free space, and \( h \) is Planck's constant.
An amplitude modulated wave is represented by \( 10[1 + 0.6 \sin(40 \times 10^3 t)] \sin(4 \times 10^6 t) \) volt where t is in seconds. Then the ratio of the upper to the lower side band frequencies is
When the temperature of a semiconductor increases then
The maximum kinetic energy of the emitted photoelectrons from a photosensitive material of work function \( \phi \), when light of frequency 'v' incidents on it is 'E'. If the frequency of the incident light is 3v, the maximum kinetic energy of the emitted photoelectrons is
When the current through an inductor is changed from 2 A to 6 A in time 2 s, emf induced in it is 3 V. Then the inductance of the inductor is
Between the plates of a parallel plate capacitor of plate area A and capacity 0.025 \( \mu \)F, a metal plate of area A and thickness equal to \( \frac{1}{3} \) of the separation between the plates of the capacitor is introduced. If the capacitor is charged to 100 V, then the amount of work done to remove the metal plate from the capacitor is
The incorrect statement regarding the given circuit
potential at A is 10 V
In a region, the intensity of an electric field is given by \( \vec{E} = (2\hat{i} + 3\hat{j} + \hat{k}) \) NC\(^{-1} \). The electric flux through a surface of area \( 10 \hat{i} \) m\(^2 \) in the region is
A monatomic gas at 630 K expands adiabatically to 27 times its initial volume. The final temperature of the gas is
The amplitude of a wave, represented by displacement equation \( y = \frac{1}{\sqrt{a}} \sin \omega t \pm \frac{1}{\sqrt{b}} \cos \omega t \) will be
The figure shows three points A, B and C in a uniform electric field \( (\vec{E}) \). The line AB is perpendicular to BC and BC is parallel to \( \vec{E} \). If \( V_A \), \( V_B \) and \( V_C \) are the potentials at A, B and C respectively, then the correct option is
three points A, B and C in a uniform electric field
In the given triple point curve as shown in fig, the curves AO, BO, CO represents
triple point curve