List of top Physics Questions

If an electron moves with a velocity \( v \) in a magnetic field \( B \), the magnetic force on the electron is maximum when the angle between \( v \) and \( B \) is
If the frequency of an electromagnetic wave is 2 MHz, then the time period of oscillation of the accelerated charge is
The intensity of a polarized light can be controlled by a second polarizer from
The eye defect astigmatism can be corrected by using a
In dielectrics, polarization is the dipole moment per unit
The energy density of the electric field \( 2 \, \text{V/m} \) in a capacitor \( C \) is \( \varepsilon_0 \) is the permittivity of free space
The magnetic moment of an electron revolving in an orbit of 0.5 m radius with a velocity of \( 8 \times 10^7 \, \text{m/s} \) is (in \( \text{Am}^2 \))
If the amplitude of the wave \( y = 3\sin(3x - 5t) + A\cos(3x - 5t) \) m is 5 m, the value of A is
When a current of 2 A flows through a wire for 2.5 s, the amount of heat liberated is 20 J. The resistance of the wire is
For the oscillations of a spring with spring constant k, the false statement is
If Q1 and Q2 are respectively the heat supplied and expelled by a system at a constant temperature, then the work done by the system is
Which one of the following principles helps to explain the flow of blood in an artery?
For smaller deformations, stress is directly proportional to the strain for any material. Then the constant of proportionality is called as its
Angular momentum of a particle will not be zero, if the
An astronaut experiences weightlessness in space satellite because
A bullet of 10 g mass is fired at a speed of 50 m/s by a gun of 2 kg mass. The recoil speed of the gun (in m/s) is
Energy equivalent of mass 0.5 kg is
The force acting on the particle of 0.2 kg mass whose displacement is described by the equation \( x = 3t + 7t^2 \, \text{m} \)
If the position of the particle as a function of time \( t \) is \( \vec{r} = 8t \hat{i} + 3t^2 \hat{j} + 3 \hat{k} \, \text{m} \), then the acceleration of the particle is (in \( \text{m/s}^2 \))
A hockey player hits a ball with an impulse of 15 Ns. If time of hit is 0.2 s, the average force exerted by the player on the ball is
The work done to lift a 60 kg mass to a height of 5 m from the ground is (g = 10 m/s\(^2\))
Three particles of equal mass lie at distances of 1 cm, 2 cm, and 3 cm from the origin. The distance of their center of mass from the origin is
The dimensions of \( \frac{B}{E} \) are (B: Magnetic induction, E: Electric field intensity)
If force is 500 N and instantaneous velocity is 20 m/s, what is the instantaneous power?
Forces acting on 2 bodies of masses 2kg and 3kg are same. What is the ratio of their acceleration?