MHT - CET MCQ

For an ideal diode, the current in the following arrangement is ______. 

'Half-life' of a radioactive substance accounts for ______.

If n is principal quantum number and r is the radius of the orbit in which electron revolves around nucleus, then its kinetic energy is ____________.

According to de Broglie, wave is associated with matter ____________.

Same current is flowing in two a.c. circuits. First contains only inductance and second contains only capacitance. If frequency of a.c. is increased for both, the current will ______.

In parallel resonance, the current will be minimum, when ____________.

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is ____________.

In an A.C. circuit, the peak value of voltage is 320 volt. Its effective voltage is ______

A toroid has a core (non-ferromagnetic) of inner radius 25 cm and outer radius 26 cm, around which 2,000 turns of a wire are wound. If the current in the wire is 10 A, the magnetic field inside the core of the toroid will be ______

The ratio of the magnetic field at the centre of a current-carrying circular wire and the magnetic field at the centre of a semi-circular coil made from the same length of wire will be ______.

The current flowing through moving coil galvanometer is 20% of the current to be measured. The resistance of moving coil galvanometer is 48 `Omega`, then shunt required is ____________.

A galvanometer has resistance ' G ' and range ' V ' How much resistance is required to read voltage upto ' V ' volt?

A metre bridge is set-up as shown to determine an unknown resistance X using a standard 10 ohm resistor. The galvanometer shows null point when tapping-key is at 52 cm mark. The end-corrections are 1 cm and 2 cm respectively for the ends A and B. The determined value of X is ______. 

When a current of 5 mA is passed through a galvanometer having a coil of resistance 15 `Omega`, it shows full scale deflection. The value of the resistance to be put in series with the galvanometer to convert it into a voltmeter of range 0-10 V is ____________.

Select the WRONG statement:

In Wheatstone's bridge P = 7 ohm, Q = 12 ohm, R = 3 ohm and S = 8 ohm. How much resistance must be put in parallel to the resistance S to balance the bridge?

If there are n capacitors in parallel connected to V volt source, then the energy stored is equal to ____________.

In a single slit diffraction experiment, first minimum for a light of wavelength 480 nm coincides with the first maximum of another wavelength `lambda.` Then `lambda'` is ____________.

Young's double slit experiment is performed in water, instead of air, then fringe width ______.

In fundamental mode, the time required for the sound wave to reach up to the closed end of a pipe filled with air is 't' second. The frequency of vibration of the air column is ______

In an LC circuit ______

The potential energy of a particle executing S.H.M is 2.5 J, when its displacement is half of amplitude. The total energy of the particle is ______.

Absorption coefficient of totally blackbody is ______.

A given sample of an ideal gas occupies a volume V at a pressure P and absolute temperature T. The mass of each molecule of the gas is m. Which of the following gives the density of the gas?

The angle of contact for a liquid which wets the surface of a solid is ____________.

Smaller drops of a liquid are generally more spherical than larger drops, because ____________.

An L-shaped object, made of thin rods of uniform mass density, is suspended with a string as shown in figure. If AB = BC, and the angle made by AB with downward vertical is `theta`, then ____________. 

The radius of gyration of a homogeneous body is independent of ______.

Consider a uniform semicircular wire of mass M and radius R as shown in the figure. Its M.I. about an axis ZZ' is ____________. 

The forbidden energy band gap in conductors, semiconductors and insulators are `"E"_("g"_1), "E"_("g"_2) "and" "E"_("g"_3)` respectively. The relation among them is ____________.

If the flux associated with a coil changes at the rate of 360 webers every 4 minutes, then the induced e.m.f. is ______

The magnifying power of a telescope is high if its objective and eyepiece have respectively ______.

With what velocity an observer should move relative to a stationary source so that a sound of double the frequency of source is heard by an observer?

Two satellites of masses m and 4m orbit the earth in circular orbits of radii 8r and r respectively. The ratio of their orbital speeds is ____________.

A mass of 20 kg is suspended from a rope wound on a wheel of diameter 80 cm. The torque about the axis of rotation is ______.

A ball moving with velocity 5 m/s collides head on with another stationary ball of double mass. If the coefficient of restitution is 0.8, then their velocities (in m/s) after collision will be ____________.