Atoms — Physics STD 12 Science — Question

In the following circuit, 5W resistor develops 45 J/s due to current flowing through it. The power developed per second across 12 W resistor is

(a) 16 W

(b) 192 W

(c) 36 W

(d) 64 W

An inductor of 2 henry and a resistance of 10 ohms are connected in series with a battery of 5 volts. The initial rate of change of current is

(a) 0.5 amp/sec

(b) 2.0 amp/sec

(c) 2.5 amp/sec

(d) 0.25 amp/sec

If an element X has mass number and number of proton 8 then identify element X :

Current I is flowing in a coil of area A and number of turns is N, then magnetic moment of the coil in M equal to

A sphere is rotating about a diameter:

1. The particles on the surface of the sphere do not have any linear acceleration.
2. The particles on the diameter mentioned above do not have any linear acceleration.
3. Different particles on the surface have different angular speeds.
4. All the particles on the surface have same linear speed.

Which of the following are suitable for the fusion process

(a) Heavy nuclei

(b) Light nuclei

(c) Atom bomb

(d) Radioactive decay

20 μA current flows for 30 seconds in a wire, transfer of charge will be

(a) 2

(b) 4

(c) 6

(d) 8

Faraday's laws are consequence of conservation of

(a) Energy	(b) Energy and magnetic field
(c) Charge	(d) Magnetic field

An electron moves with a constant velocity v in a uniform magnetic field B, parallel to the direction of the magnetic field. The force acting on electron is:

The electron emitted in beta radiation originates from

(a) Inner orbits of atoms	(b) Free electrons existing in nuclei
(c) Decay of a neutron in a nucleus	(d) Photon escaping from the nucleus