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

In a transistor, the thickness of the base region ____________.

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 ______.

A particle of mass 'm' is rotating in a horizontal circle of radius 'r' with unifom1 velocity `vec"V"`. The change in its momentum at two diametrically opposite points will be ______.

A particle is performing vertical circular motion. The difference in tension at lowest and highest point is ______.

A sphere of mass 'M' is attached to one end of a metal wire having length 'L' and diameter 'D'. It is whirled in a vertical circle of radius R with angular velocity 'ω'. When the sphere is at lowest point of its path, the elongation of the wire is ______.

(Y= Young's modulus of the material of the wire, g =acceleration due to gravity)

A stone is tied at the end of a rope of length 1 m and whirled in a vertical circle. The ratio of velocity at highest point to lowest point will be ______.

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 ____________.

A particle of charge 'q' and mass 'm' moves in a circular orbit of radius 'r' with angular speed `omega`. The ratio of the magnitude of its magnetic moment to that of its angular momentum is ____________.

The magnetic moment produced in a sample of 2 gram is 8 x 10^-7 A/m². lf its density is 4g/cm³, then the magnetization of the sample is ____________.

A transverse wave is travelling with velocity 'V' through a metal wire of length 'L' and density 'ρ'. The tensile stress on the wire is ______

A uniform metal wire has length 'L', mass 'M', and density 'ρ'. It is under tension 'T' and 'v' is the speed of transverse wave along the wire. The area of cross-section A of the wire is ______ 

A plane wavefront is an incident on a water surface at an angle of incidence 60° then it gets refracted at 45°. The ratio of the width of incident wavefront to that of refracted wavefront will be ______ 

`[sin  pi/4 = cos  pi/4 = 1/sqrt2, sin60^circ = sqrt3/2, cos60^circ = 1/2]`

In a transistor, doping level in base is increased slightly, the collector current and base current respectively ______.

In transistor amplifier, base-emitter junction is forward biased and collector emitter junction is reverse biased. The current gain is ______.

In the case of transistor, the relation between current ratios α_dc and β_dc is ______.

In common emitter mode of transistor, the d.c. current gain is 20, the emitter current is 7 mA. The collector current is ______.