Atoms — Physics STD 12 Science — Question

Assertion  :  NOT gate is also called inverter circuit.

Reason      : NOT gate inverts the input order.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

Electrical energy is transmitted over large distances at high alternating voltages. Which of the following statements is (are) correct?

Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

1. Drift speed.
2. Resistivity.
3. Resistance.
4. Number of free electrons.

Four wires of equal length and of resistances 10 ohms each are connected in the form of a square. The equivalent resistance between two opposite corners of the square is

(a) 10 ohm

(b) 40 ohm

(c) 20 ohm

(d) 10/4 ohm

In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by?

 Antiparticle of electron is

(a)

(b)

(c) Positron

(d) Neutrino

The potential energy of a particle of mass m is given by

U(x) =

l₁ and l₂ are the de-Broglie wavelengths of the particle, when 0 £ x £ 1 and x > 1 respectively. If the total energy of particle is 2E₀, the ratio    will be

(a) 2

(b) 1

(c)

(d)

Electromagnetic waves are produced by:

A charged particle goes undeflected in a region containing an electric and a magnetic field. It is possible that