Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

In the series combination of two or more than two resistances:

A, B and C are parallel conductors of equal length carrying currents I, I and 2I respectively. Distance between A and B is x. Distance between B and C is also x.   is the force exerted by B on A and F₂ is the force exerted by B on A choose the correct answer

(a)

(b)

(c)

(d)

The charge on a hole is equal to the charge of

(a) Zero

(b) Proton

(c) Neutron

(d) Electron

The unit of magnetic moment is

(a) Wb/m

(b)

(c) A.m

(d)

The relative permeability ( of a ferromagnetic substance varies with temperature (T) according to the curve

(a) A

(b) B

(c) C

(d) D

A point charge q is rotated along a circle in the electric field generated by another point charge Q. The work done by the electric field on the roatating charge in one complete revolution is:

The amplification produced by a triode is due to the action of

(a) Filament

(b) Cathode

(c) Grid

(d) Plate

A convex lens of crown glass (n =1.525) will behave as a divergent lens if immersed in

(a) Water (n = 1.33)	(b) In a medium of n = 1.525
(c) Carbon disulphide n = 1.66	(d) It cannot act as a divergent lens

A magnet of magnetic moment M oscillating freely in earth's horizontal magnetic field makes n oscillations per minute. If the magnetic moment is quadrupled and the earth's field is doubled, the number of oscillations made per minute would be

(a)

(b)

(c) 2

(d)

64 drops of mercury each charged to a potential of 10V. They are combined to form one bigger drop. The potential of this drop will be (Assume all the drops to be spherical)

(a) 160 V

(b) 80 V

(c) 10 V

(d) 640 V