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

Pure inductance of 3.0 H is connected as shown below. The equivalent inductance of the circuit is

(a) 1 H

(b) 2 H

(c) 3 H

(d) 9 H

The equivalent resistance of the circuit shown in the figure is

(a) 8 W

(b) 6 W

(c) 5 W

(d) 4 W

In a laboratory experiment on emission from atomic hydrogen in a discharge tube, only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. This is because in a laboratory:

A parallel plate condenser is connected with the terminals of a battery. The distance between the plates is 6mm. If a glass plate (dielectric constant K  = 9) of 4.5 mm  is introduced between them, then the capacity will become

(a) 2 times

(b) The same

(c) 3 times

(d) 4 times

In Bohr’s model, if the atomic radius of the first orbit is  , then the radius of the fourth orbit is

(a)

(b) 4

(c)

(d) 16

What will be the angle of diffracting for the first minimum due to Fraunhoffer diffraction with sources of light of wave length 550 nm and slit of width 0.55 mm

(a) 0.001 rad

(b) 0.01 rad

(c) 1 rad

(d) 0.1 rad

In Bohr's model of hydrogen atom, let PE represents potential energy and TE the total energy. In going to a higher level

(a) PE decreases, TE increases	(b) PE increases, TE increases
(c) PE decreases, TE decreases	(d) PE increases, TE decreases

Electrostatic is the branch of physics which deals with the:

A small magnet is placed perpendicular to a uniform magnet field. The forces acting on the magnet will result in: