List of top Physics Questions

A convex lens of focal length 20 cm is in contact with a concave lens of focal length 40 cm. The power of the combination is:
The rainbow is formed due to:
The capacitance of a parallel plate capacitor does not depend on:
The magnetic field at the center of a circular current-carrying loop of radius $R$ is $B$. The field at a point on the axis at a distance $R$ from the center is:
A wire of resistance $R$ is stretched to double its length. Its new resistance will be:
Which of the following is a longitudinal wave?
The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become:
Two stars emit maximum radiation at wavelength 3600 and 4800 respectively. The ratio of their temperatures is:
When a source of sound moves towards a stationary observer, the observed frequency is:
The change in internal energy of a system which has absorbed 2 kcal of heat and done 500 J of work is:
The potential energy of a simple harmonic oscillator at its mean position is:
The work done in blowing a soap bubble of radius $r$ and surface tension $T$ is:
The displacement of a particle is given by $x = 3 \sin(5\pi t) + 4 \cos(5\pi t)$. The amplitude of particle is:
If the length of a simple pendulum is increased by 44%, the percentage increase in its time period is:
A radioactive substance has a half-life of 60 min. During 3 hours, the fraction of the substance that has decayed is:
The magnifying power of a telescope is 9. When it is adjusted for parallel rays, the distance between the objective and eye-piece is 20 cm. The focal length of objective and eye-piece are:
In a Young's double slit experiment, if the distance between the slits is halved and the distance of the screen from the slits is doubled, then the fringe width will:
Which of the following does not support the wave nature of light?
The electric potential at a point on the axial line of an electric dipole is:
The process by which a heavy nucleus splits into two lighter nuclei is called:
The working of a rocket is based on the principle of:
In an L-C-R series circuit, at resonance, the phase difference between current and voltage is:
The resistance of an ideal ammeter is:
In a common emitter amplifier, the phase difference between input and output voltage is:
A step-up transformer operates on a 230 V line and supplies a load of 2 A. The ratio of primary to secondary windings is 1:25. The current in the primary is: