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

A jack screw is provided with a long arm. Explain why?

The S.I. unit of moment of force is ______.

In a beam balance when the beam is balanced in a horizontal position, it is in ________ equilibrium.

The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :

the total clockwise moment about O

The diagram shows a uniform metre rule weighing 100gf, pivoted at its centre O. Two weights 150gf and 250gf hang from the point A and B respectively of the metre rule such that OA = 40 cm and OB = 20 cm. Calculate :

the difference of anticlockwise and clockwise moment

A force F acts on a body and displaces it by a distance S in a direction at an angle θ  with the direction of force.

What should be the angle between force and displacement so that the work done is

1. Zero
2. Maximum

A machine works as a

1. force multiplier,
2. speed multiplier.

In each case, state whether the velocity ratio is more than or less than 1.

In class II lever, effort arm is ______ than the load arm.

In following figure shows three bulbs A, B and C each of rating 100 W, 220 V connected to the mains of 220 V. Answer the following:

1. How is the bulb A connected with the mains? At what voltage does it glow?
2. How are the bulbs B and C connected with the mains? At what voltage does the bulb B glow?
3. How is the glow of bulbs A and C affected if bulb B gets fused?
4. How is the glow of bulbs B and C affected if bulb A gets fused?

Define non-contact forces.

Give any two effects of a force on a non-rigid body.

State one factor on which the magnitude of a non-contact force depends. How does the magnitude of a non-contact force change along with distance?

Under what condition will a set of gears produce a gain in torque.

How does the distance of separation between two bodies affect the magnitude of the non-contact force between them?

State two factors on which moment of the force about a point depends.

State the units of moment of force.

State when the moment of force is positive and when it is negative.

Two similar vehicles are moving with the same velocity on the road, such that one of thus is loaded and the other one is empty which of the two vehicles will require larger force to stop?

What is meant by the term ‘moment of force’? If the moment of force is assigned a negative sign then will the turning tendency of the force be clockwise or anti-clockwise?

State the effects that a force can produce. Given one example of each.