Density Notes Questions with Answers PDF Download – Test 23

The density of pure gold is

1. 19300 kg m^-3
2. 1000 kg m^-3
3. 920 kg m^-3
4. 13600 kg m^-3

A rectangular block with base area A of 30 cm² and height h of 0.06 m is submerged in water of density 1000 kg m^-3. What is the force exerted by the water acting on the top of the block?

1. 0.18 N
2. 1.8 N
3. 18 N
4. 180 N

When a body of mass m moves at a speed v, its kinetic energy is defined as

1. E_k = mv²
2. E_k = 1/2 mv
3. E_k = (1/2)mv²
4. E_k = m/v²

The energy equation based on the principle of conservation of energy is

1. useful energy output - wasted energy output
2. useful energy output + wasted energy output
3. useful energy output / wasted energy output
4. useful energy output × wasted energy output

As per second law of reflection, the angle of incidence is equal to the

1. angle of abnormality
2. angle of refraction
3. normal ray
4. angle of reflection