Nuclei — Physics STD 12 Science — Question

Of the following properties, the photon does not process:

The current through an ideal PN-junction shown in the following circuit diagram will be

(a) Zero

(b) 1 mA

(c) 10 mA

(d) 30 mA

The formation of a dipole is due to two equal and dissimilar point charges placed at a:

The phase difference between incident wave and reflected wave is 180° when light ray

(a) Enters into glass from air	(b) Enters into air from glass
(c) Enters into glass from diamond	(d)  Enters into water from glass

The magnetic induction in air at a point 1cm away from a long wire that carries a current of 1A, will be

(a)

(b) 2

(c) 3

(d) 4

Capacitance (in F) of a spherical conductor with radius 1m is

(a) 1.1

(b)

(c) 9 ×

(d)

A point charge is situated at an axial point of a small electric dipole at a large distance from it. The charge experiences a force F. If the distance of the charge is doubled, the force acting on the charge will become:

Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay

(a) After 1 minute

(b) After   minute

(c) After  minute, where N is the number of nuclei present at that moment

(d) After any time

Light travels through a glass plate of thickness t and having refractive index n. If c is the velocity of light in vacuum, the time taken by the light to travel this thickness of glass is

(a)

(b) tnc

(c)

(d)