MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions

A magnetic field of 2 x 10^-2 T acts at right angles to a coil of area 50 cm² with 100 turns. The average e.m.f. induced in the coil is 0.2 V, when it is removed from the field in time t. The value of t is ____________.

The electric potential V at any point O (x, y, z all in metres) in space is given by V = 4x² volt. The electric field at the point (1 m, 0, 2m) in volt/metre is ____________.

Following graphs show the variation of stopping potential corresponding to the frequency of incident radiation (F) for a given metal. The correct variation is shown in graph (v₀ = Threshold frequency).

Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. ln response, the loop-B ____________.

For a particle executing simple harmonic motion, which of the following statements is NOT correct?

For a radiation of 9 GHz passing through air. The number of waves passing through 1 m length is ____________.

A planet is revolving around the sun in an elliptical orbit as shown in figure. At which point will its K.E. be maximum?

The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be ____________.

The photon of frequency vis incident on a metal surface whose threshold frequency is v₀. The kinetic energy of the emitted photoelectrons will be ______.

The work function of a photosensitive material is 4.0 eV. The longest wavelength of light that can cause photon emission from the substance is (approximately) ____________.

A simple pendulum performs simple harmonic motion about x = 0 with an amplitude A and time period T. The speed of the pendulum at x =A/2 will be ____________.

Which one of the following statements ts INCORRECT for stopping potential in photoelectric emission?

The velocities of a particle performing linear S.H.M are 0.13 m/s and 0.12 m/s, when it is at 0.12 m and 0.13 m from the mean position respectively. If the body starts from mean position, the equation of motion is ____________.

The mass and radius of earth is 'M_e' and 'R_e' respectively and that of moon is 'M_m' and 'R_m' respectively. The distance between the centre of the earth and that of moon is 'D'. The minimum speed required for a body (mass 'm') to project from a point midway between their centres to escape to infinity is ______.

Electrical conductivity of insulators is ______.

At absolute zero temperature, pure silicon behaves as ______.

A simple harmonic progressive wave is given by Y = Y₀ sin 2π `(nt - x/lambda)`. If the wave velocity is `(1/8)^{th}` of the maximum particle velocity, then the wavelength is ______

An electron revolving in a circular orbit of radius 'r' with velocity 'V' and frequency 'v' has orbital magnetic moment 'M'. If the frequency of revolution is doubled then the new magnetic moment will be ____________.

An electron (e) is revolving in a circular orbit of radius 'r' in hydrogen atom. The angular momentum of the electron is (M = magnetic dipole moment associated with it and m = mass of electron) ____________.

An electron of charge 'e' is revolving in a fixed orbit of radius 'r' with frequency 'f'. Its magnetic dipole moment is ____________.