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

Is centrifugal force a real force?

What is meant by resonance?

State the condition for the occurrence of resonance.

Give two characteristic of a high tension wire.

Which of the cables, one rated 5 A and the other 15 A will be of thicker wire? Give a reason for your answer.

Draw a labelled diagram of a D.C. motor showing its main parts.

What energy conversion does take place during the working of a d.c. motor?

State two ways by which the speed of rotation of an electric motor can be increased.

Name two appliances in which an electric motor is used.

In an electric motor the energy transformation is ______.

Draw a ray diagram to show the appearance of a stick partially immersed in water. Explain your answer. 

A fish is looking at a 1.0 m high plant at the edge of the pond. Will the plant appear shorter or taller than its actual height, to the fish. Draw a ray diagram to support your answer. 

The given figure shows a point source P inside a water container. Three rays A, B, and C starting from the source P are shown up to the water surface.

1. Show in the diagram the path of these rays after striking the water. The critical angle for water-air surface is 48°.
2. Name the phenomenon which the rays A, B, and C exhibit. 

Compare the magnitudes of centripetal and centrifugal force.

State two differences between the centripetal and centrifugal force.

A boy experiences a centrifugal force on his hand when he rotates a piece of stone tied at one end of a string, holding the other end in the hand.

The centrifugal force is ______.

Write the lens formula explaining the meaning of the symbols used.

The correct lens formula is ______.

1. At what position a candle of length 3 cm be placed in front of a convex lens so that its image of length 6 cm be obtained on a screen placed at distance 30 cm behind the lens?
2. What is the focal length of lens in part (a)?