MHT - CET MCQ

The truth-table given below is for which gate?

A	B	C
0	0	1
0	1	1
1	0	1
1	1	0

A transistor when connected in common emitter mode has a ____________.

The maximum efficiency of full-wave rectifier is ____________.

What percentage of radioactive substance is left after five half-lives?

A radioactive substance has half life of 3 hours. 75 % of the substance would decay in ____________.

The relation between magnetic moment of revolving electron 'M' and principle quantum number 'n' is ______.

In photoelectric effect, graph of saturation current versus frequency of light is plotted. The nature of the graph will be ____________.

At what frequency (approximate) will the inductive reactance of 4 H inductance be equal to the capacitive reactance of 4 µF capacitance?

With an increase in the frequency of an A.C. supply, the inductive reactance ______.

The readings of ammeter and voltmeter in the following circuit are respectively 

A 60 `Omega` electric heater is connected to a 200 V, 50 Hz mains supply. The peak value of electric current flowing in the circuit is approximately ______.

The mutual inductance between two coils is 0.09 henry. If the current in the primary coil changes from 0 to 20 A in 0.006 s, the e.m.f. induced in the secondary coil at that instant is ____________.

A thin semicircular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is ____________. 

The magnetic susceptibility of paramagnetic materials is ____________.

A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B `hat"i".` The torque on the coil due to the magnetic field is: ____________.

A galvanometer of resistance 20 Ω has a current sensitivity of 5 div/mA. The instrument has 50 divisions. It can be converted into a voltmeter reading up to 25 volts by connecting a resistance of ______

A voltmeter of range 3 V and resistance 200 `Omega` cannot be converted into an ammeter of rang ____________.

A student connected the circuit as shown in the figure to determine the internal resistance of a cell E1 by potentiometer (E > E1). He is unable to obtain the null point because ______.

The current in the arm CD of the circuit will be

Five identical capacitors, of capacitance 20 µF each, are connected to a battery of 150 V, in a combination as shown in the diagram. What is the total amount of charge stored? 

A plane wavefront of wavelength `lambda`. is incident on a slit of width a. The angular width of principal maximum is ______.

Light waves from two coherent sources arrive at two points on a screen with a path difference of zero and λ/2. The ratio of the intensities at the points is ______

If two waves represented by `"y"_1 = 3 "sin" omega "t"` and `"y"_2 = 5 "sin" (omega "t" + pi/3)` interfere at a point, then the amplitude of the resulting wave will be about ____________.

An organ pipe has a fundamental frequency of 120 Hz. Its fourth overtone is 600 Hz. Find the type of the pipe.

A transverse wave of amplitude 0.05 m and frequency 250 Hz is travelling along a stretched string with a speed of 100 m/s. What would be the displacement of a particle at a distance 1.1 m origin after 0.02 second?

`[sin pi/2=1, cos pi/2=0]`

The total energy of the body executing S.H.M. is E. The kinetic energy of the body, when the displacement is half of the amplitude is ______.

The velocities of a particle performing linear S.H.M are 0.13 m/s and 0.12 m/s, when it is at 0.12 m and 0.13 m from the mean position respectively. If the body starts from mean position, the equation of motion is ____________.

The sum of the absorptance, reflectance, and transmittance of a body is ______.

On the surface of the liquid in equilibrium, molecules of the liquid possess ____________.

A mercury drop of radius 'R' is divided into 27 droplets of same size. The radius 'r' of each droplet is ______.

A disc of mass 10 kg and radius 0.1 m/s rotating at 120 r.p.m. A retarding torque brings it to rest in 10s. If the same torque is due to force applied tangentially on the rim of the disc then magnitude of force is ______.

In the circuit below, A and B represent two inputs and C represents the output. The circuit represents ______. 

The equation of a plane progressive wave is y = 0.09sin8 `pi` `["t" - "x"/20]`.When it is reflected at a rigid support, its amplitude becomes `2/3`rd of its 3 previous value. The equation of the reflected wave is ______.

The wave of the wavelength 30 cm and frequency 100 Hz will be ______.

Two moles of an ideal diatomic gas occupies a volume V at 27° C. The gas expands adiabatically to a volume 2V. Calculate the final temperature of the gas is nearly ____________.

A satellite of mass 'm', revolving round the earth of radius 'r' has kinetic energy (E). Its angular momentum is ______.

Reason of weightlessness in a satellite is ____________.

The moment of the couple is independent of ______

The ratio of the angular speed of minute hand and hour hand of a watch is ____________.