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

A metal sphere of radius 1 m is charged with 10^-2 C in air. Its bulk modulus is `10^11/(4pi^2) "N"/"m"^2`. The volume strain in the sphere is (ε₀ = permittivity of free space.)

For a uniformly charged plane sheet, the variation of electric field (E) with distance (d) is correctly shown graphically in graph.

Two parallel wires of equal lengths are separated by a distance of 3m from each other. The currents flowing through first and second wire is 3A and 4.5A respectively in opposite directions. The resultant magnetic field at the mid-point of both wire is (µ₀ = permeability of free space).

A cylindrical magnetic rod has length 5 cm and diameter 1 cm. It has uniform magnetization `5.3 xx 10^3 "A"/"m"^3`. Its net magnetic dipole moment is nearly `(pi = 22/7)`.

The dimensions of the relative magnetic permeability of the substance are ______.

The following figure shows the shape of part of a long string in which transverse waves are produced by attaching one end of the slring to tuning fork of frequency 300 Hz. The velocity of the waves is ____________.

An alternating e.m.f. of frequency 50 Hz is applied across series combination of resistor 'R' and inductance `(sqrt3/pi)`H. If the phase difference between applied e.m.f. and current 'I' is 60°, then the value of R is `[tan 60^circ = sqrt3, sin 60^circ = sqrt3/2, cos 60^circ = 1/2]`

Assertion: Susceptibility is defined as the ratio of intensity of magnetisation I to magnetic intensity H.

Reason: Greater the value of susceptibility, smaller the value of intensity of magnetisation I.

The rotating vector that represents a quality varying sinusoidally with time is a ____________.

The potential difference between the points A and B in the electric circuit shown is ______.

If velocity of sound in a gas is 360 m/s and the distance between a compression and the nearest rarefaction is 2 m, then the frequency of sound is ____________.

Which among the following resistances can be determined by a metre bridge?

What is the magnetization of a bar magnet having length 5 cm and area of cross section 2 cm²? (M = 1 Am²)

In the measurement of a resistance by the Wheatstone bridge, the known and the unknown resistance are interchanged to eliminate ____________.

In a closed pipe, the note of fundamental frequency can be produced if the length of the air column is equal to ____________.

If M_z = magnetization of a paramagnetic sample, B external magnetic field, T = absolute temperature, C = curie constant then according to Curie's law in magnetism, the correct relation is ______.

A sphere encloses an electric dipole with charges ± 3 x 10^-6 C. What is the total electric flux across the sphere?

In insulators, ____________.

The magnetic susceptibility of paramagnetic materials is ____________.

A ball kept at 20 m height falls freely in downward direction vertically and hits the ground. The coefficient of restitution is 0.4. After the first rebound, the upward velocity is g = 10 m/s² ?