Magnetism And Matter — Physics STD 12 Science — Question

The phenomenon of rotation of plane polarized light is called:

As the quantum number increases, the difference of energy between consecutive energy levels?

If half-life of a substance is 3.8 days and its quantity is 10.38 gm. Then substance quantity remaining left after 19 days will be

(a) 0.151 gm

(b) 0.32 gm

(c) 1.51 gm

(d) 0.16 gm

Three photons coming from excited atomic-hydrogen sample are picked up. Their energies are 12.1eV, 10.2 eV and 1.9eV. These photons must come from:

1. A single atom.
2. Two atoms.
3. Three atoms.
4. Either two atoms or three atoms.

Which of the following is an example of an Ohmic conductor?

An endoscope is employed by a physician to view the internal parts of a body organ. It is based on the principle of

(a) Refraction	(b) Reflection
(c) Total internal reflectionn	(d) Dispersion

A wire of resistance 10 W is bent to form a circle. P and Q are points on the circumference of the circle dividing it into a quadrant and are connected to a Battery of 3 V and internal resistance 1 W as shown in the figure.  The currents in the two parts of the circle are

(a)    and	(b)   and
(c)   and	(d)   and

Two thin lenses of focal lengths  and  are in contact and coaxial. The combination is equivalent to a single lens of power

(a)

(b)

(c)

(d)

Mutual inductance of a system of two coil does not depend on ___________ .