Density Quiz PDF: Questions and Answers - 23

MCQ 111: 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

MCQ 112: 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

MCQ 113: 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

MCQ 114: 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

MCQ 115: 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