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

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 ______.

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 ?

The frequency of a tuning fork is 220 Hz and the velocity of sound in air is 330 m/s. When the tuning fork completes 80 vibrations, the distance travelled by the ______.

A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at a given time interval of 0.01 s is ______.

The relative magnetic permeability (`mu_"r"`) of a substance is related to its susceptibility (`chi`) as ____________.

A bar magnet having length 5 cm and area of cross-section 4cm² has magnetic moment 2Am². If magnetic susceptibility is 5 x 10^-6, the magnetic intensity will be ____________.