Electric Charges and Fields — Physics STD 12 Science — Question

When X  rays pass through a strong uniform magnetic field, Then they

(a) Do not get deflected at all

(b) Get deflected in the direction of the field

(c) Get deflected in the direction opposite to the field

(d) Get deflected in the direction perpendicular to the field

A coil of inductance L is carrying a steady current i. What is the nature of its stored energy

(a)  Magnetic	(b)  Electrical
(c)  Both magnetic and electrical	(d)  Heat

Consider an electron (m = 9.1   confined by electrical forces to move between two rigid walls separated by 1.0  metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is

(a) 12

(b) 6.0

(c) 6.0

(d) 6 Joule

The property of cathode rays used in the monitor of a computer is:

If a capacitor is connected to two different A.C. generators, then the value of capacitive reactance is:

Two current carrying loops of same area but of different materials have same current flowing in them in anti-clockwise direction. if a magnetic field is applied in upward direction then potential energy of loop 1 and loop 2 will always be:

A coil and a bulb are connected in series with a dc source, a soft iron core is then inserted in the coil. Then

(a) Intensity of the bulb remains the same	(b) Intensity of the bulb decreases
(c) Intensity of the bulb increases	(d) The bulb ceases to glow

Which one of the following nuclear reactions is a source of energy in the sun

(a)

(b)

(c)

(d)

Energy released in the fission of a single   nucleus is 200 MeV. The fission rate of a  fuelled reactor operating at a power level of 5W is

(a) 1.56

(b) 1.56

(c) 1.56

(d) 1.56

A small rod of bismuth is suspended freely between the poles of a strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is

(a) Diamagnetic

(b) Paramagnetic

(c) Ferri-magnetic

(d) Antiferro-magnetic