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

What energy conversion does take place in a generator when it is in use?

State one advantage of using a.c. over d.c.

Name two factors which affect the critical angle for a given pair of media. State how do the factors affect it.

What is total internal reflection? 

State two conditions necessary for total internal reflection to occur.

Draw diagram to illustrate the total internal reflection.

Total internal reflection occurs only when a ray of light passes from a ______ medium to a ______ medium.

In the given figure PQ and PR are the two light rays emerging from an object P. The ray PQ is refracted as QS. 

1. State the special name given to the angle of incidence ∠PQN of the ray PQ.
2. What is the angle of refraction for the refracted ray QS?
3. Name the phenomenon that occurs if the angle of incidence ∠PQN is increased.
4. The ray PR suffers partial reflection and refraction on the water-air surface. Give reason.
5. Draw in the diagram the refracted ray for the incident ray PR and hence show the position of image of the object P by the letter P’ when seen vertically from above.  

Two isosceles right-angle glass prisms P and Q are placed near each other as shown in Fig. Complete the path of the light ray entering the prism P till it emerges out of the prism Q.

How is the volume of water affected when it boils at 100℃?

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.