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

 ————— gives the information on field strength, direction, and nature of the charge.

The potential at a distance R/2 from the centre of a conducting sphere of radius R will be

(a) 0

(b)

(c)

(d)

A heavy nucleus at rest breaks into two fragments which fly off with velocities in the ratio 8 : 1. The ratio of radii of the fragments is

(a) 1 : 2

(b) 1 : 4

(c) 4 : 1

(d) 2 : 1

Assertion   :  Blue colour of sky appears due to scattering of blue colour.

Reason      : Blue colour has shortest wave length in visible spectrum.

(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c) If assertion is true but reason is false.

(d) If the assertion and reason both are false.

The resistivity of ‘X’ decreases with temperature and its coefficient of resistivity is negative. Identify X.

Binding energy per nucleon for C¹² is 7.68 MeV and for C¹³ is 7.74MeV. The energy required to remove a neutron from C¹³ is:

A wire cd of length l and mass m is sliding without friction on conducting rails ax and by as shown. The vertical rails are connected to each other with a resistance R between a and b. A uniform magnetic field B is applied perpendicular to the plane abcd such that cd moves with a constant velocity of

(a)

(b)

(c)

(d)

absorbs an energetic neutron and emits beta particles. The resulting nucleus is

(a)

(b)

(c)

(d)

Given a point source of light, which of the following can produce a parallel beam of light

(a) Convex mirror

(b) Concave mirror

(c) Concave lens

(d) Two plane mirrors inclined at an angle of 90°

According to Maxwell’s Hypothesis, a changing electric field gives rise to?