MHT - CET MCQ

For which logic gate is the following statement true? The output is high, if and only if all inputs are high.

In the symbol for a transistor, the arrow head points in the direction of the ____________.

The electrical resistance of depletion layer is large because ____________.

If the ionisation potential of helium atom is 24.6 volt, the energy required to ionise it will be ____________.

For photoelectric emission from certain metal, the cut-off frequency is v. If radiation of frequency 2v impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass) ____________.

In a resonance tube, first and second resonance positions occur respectively at 28 cm and 88 cm. If the frequency of the fork is 300 Hz, then the speed of sound is ____________.

In a series L.C.R. circuit, the potential drop across L, C and R respectively are 60 V, 140 V and 60 V. Then the source voltage is ____________.

An alternating voltage e = `200sqrt2` sin(100 t) volt is connected to a 1 µF capacitor through a.c. ammeter. The reading of the ammeter is ______

When a coil is connected to a D.C. source of e.m.f. 12 volt, then a current of 4 ampere flows in it. If the same coil is connected to a 12 volt, 25 cycle/s A.C sources, then the current flowing in it is 2.4 A. The self-inductance of the coil will be ______

A coil of 25 turns is pulled in 0.05 s between the poles of a magnet, where its area includes `21 xx106-6 "Wb" "to" 1 xx 10^-6 "Wb"`. The average e.m.f. is ______.

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then ____________.

The magnetic field (B) inside a long solenoid having 'n', turns per unit length and carrying current 'I' when iron core is kept in it is (`mu_0` = permeability of vacuum, `chi` = magnetic susceptibility) ____________.

The ratio of magnetic field and magnetic moment at the centre of a current carrying circular loop is x. When both the current and radius is doubled then the ratio will be ______.

Two concentric circular coils of six turns each are situated in the same plane. Their radii are 10 cm and 20 cm and they carry respectively 0.1 A and 0.2 A current in same direction. The magnetic field in tesla at the centre is ______.

A horizontal rod of mass 20 g and length 40 cm is placed on a smooth plane inclined at an angle of 60° with the horizontal, with the length of the rod parallel to the edge of the inclined plane. A uniform magnetic field of induction B is applied vertically downwards. If the current through the rod is 1.73 ampere, then the value of B for which the rod remains stationary on the inclined plane is ____________.

Which of the following is true for a potentiometer?

In following figure, a current of 1.4 A flows towards the bridge circuit. The current in 2 n resistor is ______.

ln the metre bridge experiment, one metre long wire acts as ____________.

A lens having focal length f gives Fraunhofer type diffraction pattern of a slit having width a. If wavelength of light is λ, the distance of first dark band and next bright band from axis is given by ____________.

In Young's double slit experiment, the two slits act as coherent sources of equal amplitude A and wavelength `lambda`. In another experiment with the same set up the two slits are of equal amplitude A and wavelength `lambda`. but are incoherent. The ratio of the intensity of light at the mid-point of the screen in the first case to that in the second case is ____________.

A tube closed at one end and containing air produces fundamental note of frequency 256 Hz. If the tube is open at both ends, the fundamental frequency will be ____________.

The radius of circle, the period of revolution, initial position, and sense of revolution are indicated in the figure.

y-projection of the radius vector of rotating particle P is:

A particle is executing simple harmonic motion with frequency f. The frequency at which its kinetic energy changes into potential energy is ______.

When the pressure on the gas is increased to 4 times that of initial value, volume becomes `1/3`rd that of initial. Percentage difference in temperature will be ______.

The colour of a star depends upon its ____________.

Ratio of pressures exerted by two gases is 4 : 3 and their densities are in the ratio 3 : 4. The ratio of their R.M.S. velocities is ____________.

A water-proofing agent changes the angle of contact ______

The radius of a soap bubble is blown up to double its value under isothermal conditions. If 'r' be the initial radius of the bubble, and T be the surface tension, then energy spent in doubling the radius is ______

Select the WRONG statement.

The moment of inertia of a uniform thin rod of length L and mass M about an axis passing through a point at a distance of L/3 from one of its ends and perpendicular to the rod is ______

A solar cell is based on the principle of ______

Gaussian surface cannot pass through discrete charge because ____________.

A conducting sphere of radius R = 20 cm is given a charge Q = 16 µC. What is `vecE` at centre?

If the angle of prism is 120° and the angle of minimum deviation is 30°, the angle of refraction will be ______.

A green light is incident from the water to the air-water interface at the critical angle `(theta)`. Select the correct statement

At which temperature the speed of sound in hydrogen will be same as that of speed of sound in oxygen at 47° C?

Liquid is filled in a vessel which is kept in a room with temperature 20° C. When the temperature of the liquid is 80° C, then it loses heat at the rate of 90 cal/s. What will be the rate of loss of heat when the temperature of the liquid is 40° C?

Which of the following statements is CORRECT in respect of a geostationary satellite?

A uniform bar RS weighs 100 g and is 80 cm long. From the end R, two masses 50 g and 100 g are hung from the bar at a distance of 10 cm and 60 cm respectively. If the bar is to remain horizontal when balanced on a knife-edge, its position is ____________.

A particle of mass m is executing uniform circular motion on a path of radius r. If p is the magnitude of its linear momentum, the radial force acting on the particle is ______.