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

What is the SI unit of the moment of force?

Name the factors affecting the turning effect of a body

Where can a body execute free vibrations?

For a fuse, higher the current rating ______ is the fuse wire.

Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals

State an additional use of the X-rays waves

A nut is opened by a wrench of length 20 cm. If the least force required is 2N, find the moment of force needed to loosen the nut.

A force is applied on (i) a non-rigid body and (ii) a rigid body. How does the effect of the force differ in the above two cases?

A wave has wavelength 50 Å.

1. Name the wave.
2. State its speed in vacuum.
3. State its one use.

Two copper wires are of the same length, but one is thicker than the other. Which wire will have more resistance?

A half metre rod is pivoted at the centre with two weights of 20gf and 12gf suspended at a perpendicular distance of 6 cm and 10 cm from the pivot respectively as shown below.

1) Which of the two forces acting on the rigid rod causes clockwise moment?

2) Is the rod in equilibrium?

3) The direction of 20 kgf force is reversed. What is the magnitude of the resultant moment of the forces on the rod?

A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V ? Give a reason.

State the S.I. unit of moment of force.

State one way to obtain greater moment of a given force about a given axis of rotation.

What are contact forces? Give two Example

What are non-contact forces? Give two example

Classify the following amongst contact and non-contact force.

force of tension in a string

State one factor on which the magnitude of a non-contact force depends. How does it depend on the factor stated by you?.

State Newton's first law of motion. Why is it called the law of inertia?

Write an expression for the change in momentum of a body of mass m moving with velocity v if  v << c.