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

Why does the amplitude of a vibrating body continuously decrease during damped vibrations?

Describe a simple experiment to verify the principle of moments, if you are supplied with a metre rule, a fulcrum and two springs with slotted weights.

A uniform metre rule is pivoted at its mid-point. A weight of 50 gf is suspended at one end of it. Where should a weight of 100 gf be suspended to keep the rule horizontal?

The diagram below shows a uniform bar supported at the middle point O. A weight of 40 gf is placed at a distance of 40 cm to the left of the point O. How can you balance the bar with a weight of 80 gf?

When a boy weighing 20 kgf sits at one end of a 4 m long see-saw, it gets depressed at this end. How can it be brought to the horizontal position by a man weighing 40 kgf.

A physical balance has its arms of length 60 cm and 40 cm. What weight kept on pan of the longer arm will balance an object of weight 100 gf kept on other pan?

A uniform metre rule of mass 100 g is balanced on the fulcrum at mark 40 cm by suspending an unknown mass m at the mark 20 cm.

1. Find the value of m.
2. To which side the rule will tilt if the mass m is moved to the mark 10 cm?
3. What is the resultant moment now?
4. How can it be balanced by another mass of 50 g?

When sunlight enters the earth’s atmosphere, state which colour of light is scattered

1. the most and
2. which the least.

The danger signal is red. Why?

How would the sky appear when seen from the space (or moon)? Give reason for your answer.

What characteristic property of light is responsible for the blue colour of the sky?

The colour of sky, in direction other than of the sun, is blue. Explain.

Why does the sun appear red at sunrises and sunset?

The clouds are seen white. Explain

In white light of sun, maximum scattering by the air molecular present in the earth’s atmosphere is for ______.

What are damped vibrations? How do they differ from free vibrations? Give one example of each.

The following diagram shows the displacement – time graph of the vibrating body.

1. Name the kind of vibrations
2. Give one example of such vibrations.
3. Why is the amplitude of vibrations gradually decreasing?
4. What happens to the vibrations of the body after some time?

A tuning fork is set into vibration in air. Name the kind of vibrations it executes.

Draw a sketch showing the displacement of a body executing damped vibrations against time.

What is a fixed pulley?