Semiconductor Devices Mock Test (Physics) MHT CET 2022

In a half wave rectifier the AC input source of frequency 50Hz is used. The fundamental frequency of the output is

An n-p-n transistor conducts when

In a common emitter amplifier circuit using an n-p-n transistor , the phase difference between the input and the output voltages will be

For a transistor , α(DC) and β(DC) are the current ratios , then the value of β(DC) -α(DC)/β(DC). α(DC) is

If α-current gain of a transistor is 0.98. What is the value of β-current gain of the transistor ?

For CE transistor amplifier, the audio signal voltage across the collector resistance of 2kΩ is 4V. If the current amplification factor of the transistor is 100 and the base resistance is 1kΩ, then the input signal voltage is

A transistor is used as a common emitter amplifier with a load resistance 2 KΩ. the input resistance is 150 Ω. Base current is changed by 20 μA which results in a change in collector current by 1.5mA. The voltage gain of the amplifier is

Which logic gates produces ‘LOW’ output when any of the inputs is ‘HIGH’ ?

How many NAND gates are needed to form an AND gate ?

For a transistor ,[ 1/α – 1/β]  is equal to

In a common base amplifier circuit , calculate the change in base current if that in the emitter current is 2mA and α= 0.98

A combination of AND function and NOT function results in

The Boolean expression for OR function is

In transistor as an amplifier if α = I(C)/I(E) and β = I(C)/I(B) then ,

In a transistor α is always

A solar cell works on the principle of

A uniform cylinder has length ‘L’ and radius ‘R’ . The moment of inertia of the cylinder about an axis passing through its centre and perpendicular to its length is equal to moment of inertia of the same cylinder about an axis passing through its centre and perpendicular to its circular face. The relation between ‘L’ and ‘R’ is

The radius of gyration of a uniform rod of length l about an axis passing through a point l/4 away from the centre of the rod and perpendicular to to it is

A rope is wound around a hollow cylinder of mass 3kg and radius 40cm . What is angular acceleration of cylinder if the rope is pulled with force of 30N?

A disc has mass ‘M’ and radius ‘R’ . How much tangential force should be applied to the rim of the disc so as to rotate with angular velocity ω in time t ?

A wheel of moment of inertia 2kgm² is rotating about an axis passing through centre and perpendicular to its plane at a speed s60rad/s. Due to friction, it comes to rest in 5 minutes. The angular momentum of the wheel three minutes before it stops rotating is

When ‘W’ joule of work done on a flywheel . its frequency of rotation increases from n1 Hz to n2 Hz . The M.I of flywheel about its axis of rotation is given by

A solid cylinder of mass 2kg and radius 4cm is rotating about its axis at the rate of 3 rpm . The torque required to stop after 2π revolutions is

A particle is moving in a circular path of radius a under the action of an attractive potential  U = -k/2r² . Its total energy is

For increasing the angular velocity of a object by 10%, the kinetic energy has to be increased by