List of top Physics Questions

Which of the following is not a characteristic of diamagnetism?

An ideal inductor is connected across a capacitor. Oscillations of energy \(K\) are set up in the circuit. The capacitor plates are slowly drawn apart such that the frequency of oscillations is quadrupled. The work done in the process is

A symmetric double convex lens is cut into two equal parts by a plane perpendicular to the principal axis. If the power of the original lens is \(4D\), the difference between the powers of the original lens and the cut lens is

The nuclear forces
(a) are central forces, independent of the spin of the nucleons.
(b) have a short-range dominant over a distance of about a few fermi
(c) are stronger being hundred times stronger than that of electromagnetic forces.
(d) are independent of the nuclear charge.
Which of the above is not true?

A current loop consists of two identical semicircular parts each of radius \(2R\), one lying in the \(x-y\) plane and the other in \(x-z\) plane. If the current in the loop is \(I\), the resultant magnetic field due to two semicircular parts at their common centre is

According to Bohr's theory of hydrogen atom, the speed of the electron, its energy and radius of its orbit vary with the principal quantum number \( n \), respectively as

A particle of mass \( M \) at rest decays into masses \( m_1 \) and \( m_2 \) with non-zero velocities. The ratio of de Broglie wavelengths \( \lambda_1 \) and \( \lambda_2 \) of the particles is

An electric field \( E = 3x^2 \, i \, \text{N C}^{-1} \) exists in a certain region of space. The potential difference between the origin and at \( x = 4 \, m \), \( V_0 - V_4 \) is

Two light rays A and B travel from a medium into air at angles of incidence 15 degrees and 42 degrees respectively. In the medium, light travels 3 cm in 0.2 ns. Will there be total internal reflection? If so, which ray?

The radius of stationary state (\(n=2\)) of hydrogen atom is \(x\) pm. The radius of stationary state (\(n=3\)) of \( \text{He}^{+} \) ion (in pm) is

A body of mass 2 kg is moving with a velocity of 3 m/s. What is its kinetic energy?

The I-V characteristic of a semiconductor diode in forward bias is a/an:

\( 75\% \) of \( ^{234}_{90}\text{Th} \) decays in \( t \) years. Its half-life is (in years):

The pn junction diode acts as a rectifier because:

Plane polarized light can be produced by the phenomenon of

If two waves of equal amplitude \( A \) and opposite phase interfere, the amplitude of the resultant wave is

Light of wavelength \(\frac{36}{5R}\,\text{m}\) is emitted by a hydrogen atom during the transition of electrons from the state

At the lowest point of the plot of angle of deviation versus the angle of incidence of a triangular prism, the angle of incidence is equal to

The ratio between the wavelengths of the air column vibrating in the first two modes in an open organ pipe is

In synchrotron, the required high magnetic fields are generated by

For a circular coil carrying current, the thumb in the right hand thumb rule gives the direction of

The transverse nature of electromagnetic waves is confirmed by the phenomenon of