(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Physics

When ice melts, its volume ______.

Describe in brief how would you determine the approximate focal length of a convex lens.

The following  diagram shows the experimental set up for the determination of focal length of a lens using a plane mirror.

1. Draw two rays from the point O of the object to show the formation of image I at O itself.
2. What is the size of the image I?
3. State two more characteristics of the image I.
4. Name the distance of the objects O from the optical centre of the lens.
5. To what point will the rays return if the mirror is moved away from the lens by a distance equal to the focal length of the lens?

(i) Define critical angle.
(ii) State one important factor which affects the critical angle of a given medium.

The diagram below shows a light source P embedded in a rectangular glass block ABCD of critical angle 42°. Complete the path of the ray PQ till it emerges out of the block. [Write necessary angles].

Draw a neat labeled diagram of an A.C. generator 

Plot a graph between
 Angle of incidence versus angle of reflection,

Plot a graph between

Sine of angle of incidence versus sine of angle of refraction,

Plot a graph between

Angle of incidence versus angle of refraction.

If a light ray does not undergo, refraction at the boundary between two media, the angle of incidence is:

(a) A ray of monochromatic light enters glass PQRS as shown in the fig. Complete the path of ray till it emerges from the glass. (Critical angle of glass is 42⁰). 

(b) Draw diagram of a prism periscope.
(c) What are the advantages of total internal reflecting prism over plane mirror?

Make the correct choices for each of the following : 

Total Internal reflection takes place when 

(where ∠i = angle of incidence,  ∠r = angle of refraction, ∠C = critical angle)

What is the equivalent resistance of 5 equal resistors, each of value 2`Omega` 1 when oonnected in (a) Series  ( b) ParaIleI?