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

Is it possible to have an accelerated motion with a constant speed? Explain

What are mechanical waves?

The adjacent diagram shows three different modes of vibrations P, Q and R of the same string. 

(i) Which vibration will produce a louder sound and why?
(ii) The sound of which string will have maximum shrillness?
(iii) State the ratio of wavelengths of P and R.

Why is the motion of a body moving with a constant speed around a circular path said to be accelerated?

Name the unit of physical quantity obtained by the formula `(2K)/v^2` Where K: kinetic energy, v: linear velocity

Identify the following wires used in a household circuit: The wire is connected to the top terminal of a three pin socket.

The diagram above shows a wire stretched over a sonometer. Stems of two vibrating tuning forks A and Bare touched to the wooden box of the sonometer. It is observed that the paper rider (a small piece of paper folded at the centre) present on the wire flies off when the stem of vibrating tuning fork B is touched to the wooden box but the paper just vibrates when the stem of vibrating tuning fork A is touched to the wooden box.

1) Name the phenomenon when the paper rider just vibrates.

2) Name the phenomenon when the paper rider flies off.

3) Why does the paper rider fly off when the stem of tuning fork B is touched to the box?

Earth moves around the sun with uniform velocity.

Explain the meaning of uniform circular motion. Give one example of such motion.

Draw a neat labelled diagram for a particle moving in a circular path with a constant speed. In you diagram show the direction of velocity at any instant.

Is it possible to have an accelerated motion with a constant speed? Name such type of motion.

Give an example of motion in which speed remains uniform, but the velocity changes.

A uniform circular motion is an accelerated motion. Explain it. State whether the acceleration is uniform or variable? Name the force responsible to cause this acceleration. What is the direction of force at any instant? Draw a diagram in support of your answer.

Differentiate between uniform linear motion and uniform circular motion.

A piece of stone tied at the end of a thread is whirled in a horizontal circle with uniform speed by hand. Answer the following questions:

1. Is the velocity of stone uniform or variable?
2. Is the acceleration of stone uniform or variable?
3. What is the direction of acceleration of stone at any instant?
4. Which force provides the centripetal force required for circular motion?
5. Name the force and its direction which acts on the hand.

1. What will be your observation when you are standing outside the disc? Explain.
2. What will be your observation when you are standing at the centre of the disc? Explain.

State True or False

The earth moves around the sun with a uniform.

The motion of the moon around the earth in a circular path is an accelerated motion.

A uniform linear motion is unaccelerated, while a uniform circular motion is an accelerated motion.

In a uniform circular motion, the speed continuously changes because of the direction of motion changes.