List of top Physics Questions

A uniform rod $A B$ of length $\ell$ and mass $m$ is free to rotate about point $A .$ The rod is released from rest in the horizontal position. Given that the moment of inertia of the rod about $A$ is $\frac{m \ell^{2}}{3}$, the initial angular acceleration of the rod will be:-

If $B_{H}=\frac{1}{\sqrt{3}} B_{V}$, find angle of dip. (where symbols have their usual meanings)

what is the Q-value of the reaction $p+{ }^{7} Li \rightarrow{ }^{4} He +{ }^{4} He$ The atomic masses of ${ }^{1} H ,{ }^{4} He$ and ${ }^{7} Li$ are $1.007825\, u , 4.002603\,u$ and $7.016004\, u$ respectively

Vidicon works on the principle of:

The maximum range, \( d_{\text{max}} \), of radar is:

The neutrino has mass and neutron fall under the group of:

An amplifier with proper negative feedback network circuits:

Which of the following gates can perform perfect binary addition?

An FM transmitter without signal input is called:

In a P-type semiconductor, the acceptor impurity is:

When the conductivity of a semiconductor is due only to the breaking up of the covalent bonds, the semiconductor is known as:

The frequency of an FM transmitter without signal input is:

The velocity, \( v \), at which the mass of a particle is double its rest mass is:

How much energy is produced, if 2 kg of a substance is fully converted into energy?

The difference between the rest mass of the nucleus and the sum of the masses of the nucleons composing a nucleus is known as:

The half-life period of Radium is 3 minutes. Its decay constant is:

'Pair production' involves conversion of a photon into:

Which is the incorrect statement of the following?

The de Broglie wavelength associated with a steel ball of mass 100 g moving at a speed of 1 m/s is:

In an experiment on Newton's rings, the diameter of the 20th dark ring was found to be 5.82mm and that of the 10th dark ring was 3.16mm. The wavelength of light used is:

The inductance of an inductor becomes equal to capacitance when:

In the angular momentum equation for the hydrogen atom, the principal quantum number is:

The transition of an electron from \( n = 5 \) to \( n = 6 \) corresponds to:

The wavelength of a spectral line in the second order of the hydrogen spectrum is 2.82 Å. The wavelength of the spectral line in the first order is:

The refractive index of a material is 1.5. The angle of incidence for which the angle of refraction is 30° is: