Semiconductor Electronics: Materials, Devices and Simple Circuits — Physics STD 12 Science — Question

In series connection of resistors, what happens to the current across each resistor?

If the separation between slits in Young’s double slit experiment is reduced to   the fringe width becomes n times. The value of n is

(a) 3

(b)

(c) 9

(d)

A metallic solid sphere is placed in a uniform electric field. The lines of force follow the path(s) shown in figure as

(a) 1

(b) 2

(c) 3

(d) 4

A and B are two conductors carrying a current i in the same direction. x and y are two electron beams moving in the same direction

(a) There will be repulsion between A and B attraction between x and y

(b) There will be attraction between A and B, repulsion between x and y

(c) There will be repulsion between A and B and also x and y

(d) There will be attraction between A and B and also x and y

A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are

(a) 2

(b) 0

(c) 1

(d) 4

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 atomic weight of silver and copper are 108 and 64. A silver voltameter and a copper voltameter are connected in series and when current is passed 10.8 gm of silver is deposited. The mass of copper deposited will be

(a) 6.4 gm

(b) 12.8 gm

(c) 3.2 gm

(d) 10.8 gm

The unit of magnetic flux is

(a)

(b) Weber

(c) Henry

(d) Ampere/m

The far point of a myopia eye is at 40 cm. For removing this defect, the power of lens required will be

(a) 40 D

(b) – 4  D

(c)  – 2.5 D

(d)   0.25 D