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

State the principle of moments. A meter scale is pivoted at 30 cm mark and it is in equilibrium when a mass of 40 g is suspended from 10 cm mark. Calculate the mass of the ruler.

State the principle of moments. A meter scale is pivoted at 30 cm mark and it is in equilibrium when a mass of 40 g is suspended from 10 cm mark. Calculate the mass of the ruler.

What do you mean by the state of equilibrium? What are the conditions for stable equilibrium?

A meter scale is pivoted at its mid point and a 50 g mass suspended from the 20 cm mark. What mass balances the ruler when suspended from 65 cm mark?

Give scientific reason for the following:

When a man climbs a slope he bends forward.

Give scientific reason for the following:
While climbing a hill you will try to bend your body forward.

Give scientific reason for the following:
 In a moving bus the standing passenger stands keeping both his legs apart.

What makes a balance faulty?

A faulty balance of equal arms but pans of unequal weight is used to find the weight of a body. By the method of double weighing the weights are found as 8 kg and 8.2 kg. Find the actual weight of the body.

The arms of a beam balance are 20 cm and 21 cm, but the pans are of equal weight. By the method of double weighing the weights are found to be 1000 g and 20 g. Find the actual weight of the body

 A faulty balance of unequal arms and pans of unequal weights is used to find the true weight of a metal. By double weighing the weights are found to be 1210 g and 1000 g. Calculate the true weight of the metal.

Name the scientist who discovered
 X-rays

Name the scientist who discovered Visible light

Name the scientist who discovered Microwaves