Nuclei — Physics STD 12 Science — Question

The mass defect for the nucleus of helium is 0.0303 a.m.u. What is the binding energy per nucleon for helium in MeV

(a) 28

(b) 7

(c) 4

(d) 1

Isotopes are atoms having

(a) Same number of protons but different number of neutrons

(b) Same number of neutrons but different number of protons

(c) Same number of protons and neutrons

(d) None of the above

Non polar molecules has:

The variation of magnetic susceptibility (x) with temperature for a diamagnetic substance is best represented by

(a)

(b)

(c)

(d)

Four charges are kept at the corner points of a square. The net force on a charge kept at the center of the square is _________?

Two free parallel wires carrying currents in the opposite directions:

Plane figures made of thin wires of resistance R = 50 milli ohm/metre are located in a uniform magnetic field perpendicular into the plane of the figures and which decrease at the rate dB/dt = 0.1 m T/s. Then currents in the inner and outer boundary are. (The inner radius a = 10 cm and outer radius b = 20 cm)

(a) 10– 4 A (Clockwise), 2 × 10– 4 A (Clockwise)

(b) 10– 4 A (Anticlockwise), 2 × 10– 4 A (Clockwise)

(c) 2 × 10– 4 A (clockwise), 10– 4 A (Anticlockwise)

(d) 2 × 10– 4 A (Anticlockwise), 10– 4 A (Anticlockwise)

The waves which are electromagnetic in nature are:

In the network shown in the figure, each of the resistance is equal to 2Ω. The resistance between the points A and B is

(a) 1 Ω

(b) 4 Ω

(c) 3 Ω

(d) 2 Ω

The mass equivalent of 931 MeV energy is

(a) 1.66

(b) 6.02

(c) 1.66

(d) 6.02