List of top Physics Questions

The magnifying power of a telescope is 9. When adjusted for parallel rays, the distance between the objective and eyepiece is 20 cm. The focal lengths of lenses are:
When the speed of light becomes \( \frac{2}{3} \) of its present value, then the energy released in a given atomic explosion would
What should be the value of self-inductance of an inductor that should be connected to 220 V, 50 Hz supply, so that a maximum current of 0.9 A flows through it?
The surface tension of a liquid at its boiling point
According to Pascal’s law, pressure in a fluid at rest is the same at all points, if
Newton’s second law of rotational motion of a system of particles having angular momentum \( L \) is given by
The motion of a particle of mass \( m \) is described by \( y = ut + g t^2 \). The force acting on the particle will be
A constant potential energy of a satellite is given as \[ PE = r \cdot KE \] where PE = potential energy and KE = kinetic energy. The value of \( r \) will be
A wire is stretched to double of its length. The strain is
A long solenoid has 20 turns cm\(^{-1}\). The current necessary to produce a magnetic field of 20 mT inside the solenoid is approximately
Within the elastic limit, the corresponding stress is known as
If an electron in hydrogen atom jumps from an orbit of level \( n = 3 \) to an orbit at level \( n = 2 \), emitted radiation has a frequency of
\( (R = \text{Rydberg’s constant}, \ c = \text{speed of light}) \)
Kepler’s second law of planetary motion corresponds to
An unpolarised beam of intensity \( I_0 \) is incident on a pair of nicols making an angle of \( 60^\circ \) with each other. The intensity of light emerging from the pair is
The collision of the molecules of an ideal gas is taken as
The resistance of a wire is \( R \) ohm. If it is melted and stretched to \( n \) times its original length, its new resistance will be
The average energy associated with a monoatomic molecule is
If frequencies are \( (v - 1) \) and \( (v + 2) \), then find the value of beats.
Which of the following waves are used in the treatment of muscle ache?
The displacement of a wave is given by \( y = 20 \cos(\omega t + 4x) \). The amplitude of the wave is
The function \( y = \log(\omega t) \) can represent
What is the electric field near an infinite plane sheet of charge density \( \sigma \)?
What is the minimum band-gap of the LED diode?
Find the logic gate, when both the inputs are high the output is low and vice-versa.
The velocity of the proton is one-fourth the velocity of the electron. What is the ratio of the de-Broglie wavelength of an electron to that of a proton?