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

Fig.  shows a uniform meter scale weighing 100 N pivoted at its centre. Two weights of 500 N and 300 N are hung from the ruler as shown in fig.

(i)    Calculate total clockwise and anticlockwise moments.
(ii)    Calculate difference in clockwise moment and anticlockwise moment.
(iii)    Calculate the distance from O where a 100 N weight should be suspended to balance the meter scale.

A meter scale is provided at 10 cm mark and is balanced by suspending 400 g from 0 cm mark (fig.). Calculate the mass of meter scale.

State whether the moment of force is a scalar or vector quantity?

State two factors affecting the turning effect of a force.

Write the expression for the moment of force about a given axis.

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.