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

State the energy changes in the following case while in use:
an electric cell in a circuit

State the energy changes in the following case while in use:
an electric toaster.

State the energy changes in the following case while in use:
a ceiling fan

A light ray does not bend at the boundary in passing from one medium to the other medium if the angle of incident is ______.

Name and state the principle of a simple a.c. generator. What is its use?

What determines the frequency of a.c. produced in a generator?

Draw a labelled diagram of a simple a.c. generator.

In an a.c. generator the speed at which the coil rotates is doubled. How would this affect

1. the frequency of output voltage,
2. the maximum output voltage is doubled.

Suggest two ways in an a.c. generator to produce a higher e.m.f.

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.

State two characteristic which a source of energy must have.

Name the two groups in which various sources of energy are classified. State on what basis are they classified.