List of top Physics Questions

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

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:

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

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 inductance of an inductor becomes equal to capacitance when:

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:

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

'Pair production' involves conversion of a photon into:

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

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

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:

The frequency of an FM transmitter without signal input is:

Vidicon works on the principle of:

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

A black body at 1227°C emits radiations with maximum intensity at a wavelength of 5000 Å. If the temperature of the body is increased by 1000°C, the maximum intensity will be observed at :

A transistor-oscillator using a resonant circuit with an inductor L (of negligible resistance) and a capacitor C in series produce oscillations of frequency f. If L is doubled and C is changed to 4C, the frequency will be :

In a radioactive material the activity at time t₁ is R₁ and at a later time t₂, it is R₂. If the decay constant of the material is \(\lambda\), then :

Ionization potential of hydrogen atom is 13.6 eV. Hydrogen atoms in the ground state are excited by monochromatic radiation of photon energy 12.1 eV. According to Bohr's theory, the spectral lines emitted by hydrogen will be :

For angles of projection of a projectile at angles (45°θ) and (45° +-θ), the horizontal ranges described by the projectile are in the ratio of :