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

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.

Write the expression for calculating the moment of force about a given point.

Two unlike forces (parallel) of 10 N and 25 N act at a distance of 12 cm. from each other. Find the point about which the body balance.

A uniform metre scale is balanced at a 40 cm mark when weights of 20 gf and 5 gf are suspended at 5 cm mark and 75 cm mark respectively. Calculate the weight of metre scale.

A uniform metre rule rests horizontally on a knife-edge at the 60 cm mark when a mass of 10 gram is suspended from one end. At which end must this mass be suspended? What is the mass of the rule?

The perpendicular distance between the point of application of force and turning point is 1.75 m when a force of 80 N acts on a rigid body. Calculate the moment of force.

Calculate the minimum distance between point of application of force and axis of rotation of a rigid body, if a force 125 N produces a moment of force of 25.75 Nm.