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

There are four convex lenses L₁, L₂, L₃ and L₄ of focal length 2, 4, 6 and 8 cm, respectively. Two of these lenses from a telescope of length 10 cm and magnifying power 4. The objective and eye lenses are respectively

At absolute zero temperature, pure silicon behaves as ______.

When the observer moves towards the stationary source with velocity, 'V₁', the apparent frequency of the emitted note is 'F₁'. When the observer moves away from the source with velocity 'V₁', the apparent frequency is 'F₂'. If 'V' is the velocity of sound in air and `"F"_1/"F"_2 = 4` then `"V"/"V"_1 = ?`

If two tuning forks A and B are sounded together, they produce 4 beats per second. When A is slightly loaded with wax, they produce 2 beats when sounded again. The frequency of A is 256 Hz. The frequency of B will be ______

A stone of mass 1 kg is rotated in a horizontal circle of radius 0.5 m. If it makes `100/pi` rps, then its angular momentum is ______

A charged particle (charge = q: mass = m) is rotating in a circle of radius 'R' with uniform speed 'v'. The ratio of its magnetic moment (M) to the angular momentum (L) is ______

A tuning fork 'A' produces 5 beats per second with a tuning fork of frequency 480 Hz. When a little wax is stuck to a prong of fork A, the number of beats heard per second becomes 2. What is the frequency of tuning fork A before the wax is stuck to it?

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 ______.