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

The energy levels with transitions for the atom are shown. The transitions corresponding to emission of radiation of maximum and minimum wavelength are respectively.

An object is clearly seen through an astronomical telescope of length 50 cm. The focal lengths of its objective and eye-piece respectively can be ______.

By increasing the aperture of the objective lens, wavelength of light, focal length of the objective lens and the resolving power of an astronomical telescope respectively.

Angular momentum of the earth revolving around the sun is proportional to rⁿ , where r is the distance between the earth and the sun. Value of n is ____________.

If the angular momentum of a body increases by 50%, then its kinetic energy of rotation increases by ______ (M.I. remains constant)

A telescope has large diameter of the objective. Then its resolving power is ______.

A thin metal wire of length 'L' and uniform linear mass density 'ρ' is bent into a circular coil with 'O' as centre. The moment of inertia of a coil about the axis XX' is ______.

When a convex lens of 12.5 cm focal length is used as a magnifying glass, normal eye can see an object clearly at a distance of 25 cm. The magnifying power of the instrument is ____________.

The angular momentum of electron in hydrogen atom is proportional to ____________.

If the kinetic energy of rotation of a body is doubled, then its angular momentum ____________.

Two bodies with moments of inertia I₁ and I₂ (I₁ > I₂) have equal angular momenta. lf E₁ and E₂ are their rotational kinetic energies respectively, then ____________.

A hot and a cold body are kept in vacuum separated from each other. Which of the following causes decrease in temperature of the hot body?

The ratio of the dimensions of Planck's constant to that of moment of inertia is the dimensions of ______.

If astronomical telescope of length 1.53 m has magnifying power of magnitude 50, the values of f_o and f_e are ____________.

A particle of mass m is rotating in a plane in a circular path of radius r. Its angular momentum is L. The centripetal force acting on the particle is ______.

If the mass of a body is m on the surface of the earth, the mass of the same body on the surface of the moon is ______.

If the angular momentum of an electron is `vec"J"` then the magnitude of the magnetic moment will be ____________.

A drop of water placed between two parallel glass plates which are then pressed together until the water film is 0.01 cm thick. If the area of water in contact with either plate is 5 cm², then the force due to surface tension drawing the plates together is ______.

(S.T. of water is 75 dyne/cm)

Gaussian surface cannot pass through discrete charge because ____________.

A homogeneous disc of mass 2 kg and radius 15 cm is rotating about its axis (which is fixed) with an angular velocity of 4 radian/s. The linear momentum of the disc is ____________.