Science (English Medium) Class 12 - CBSE Question Bank Solutions for Physics

Average power supplied to an inductor over one complete cycle is ______.

If circuit containing inductance only, the current ______.

Photoelectric effect is possible ______.

What is the unit of mass when measured on the atomic scale?

In a pure or intrinsic semiconductor, valence band holes and conduction-band electrons are always ______.

A charged particle moves through a magnetic field perpendicular to its direction. Then ______.

1. The presence of a large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.
2. A coil of a metal wire kept stationary in a non– uniform magnetic field has an e.m.f induced in it.
3. A charged particle enters a region of uniform magnetic field at an angle of 85° to the magnetic lines of force, the path of the particle is a circle.
4. There is no change in the energy of a charged particle moving in a magnetic field although a magnetic force is acting on it.

Whenever the magnetic flux linked with an electric circuit changes, an emf is induced in the circuit. This is called ______.

If the frequency of an A.C. is made 4 times of its initial value, the inductive reactance will ______.

A current of 4A flows in a coil when connected to a 12V dc source. If the same coil is connected to a 12V, 50 rad/s a.c. source, a current of 2.4A flows in the circuit. Determine the inductance of the coil.

An inductive circuit contains resistance of 10 ohms and an inductance of 2 henry. If an A.C. voltage of 120 Volts and frequency 60 Hz is applied to this circuit, the current would be nearly ______.

Which of the following I-V graph represents ohmic conductors?

Which of the following is correct for V-I graph of a good conductor?

If an electron is moving with velocity `vecnu` produces a magnetic field `vec"B"`, then ______.

The magnetic flux linked with a coil of N turns of area of cross-section A held with its plane parallel to the field B is ______.