Physicspoint Quiz Time

Q1. A solid sphere is rolling on a horizontal surface. What is its ratio of linear to angular velocity?

• Its mass

• Its moment of inertia

• Its diameter

• Its radius

Q2. A solid sphere, a hollow sphere ,a solid cylinder and a hollow cylinder are rolling on a horizontal surface. In which cases the rotational kinetic energy and the translational kinetic energies are equal?

• In solid cylinder and hollow cylinder

• In solid and hollow sphere

• In solid cylinder and hollow cylinder

• In hollow sphere and hollow cylinder

Q3. A solid sphere, a hollow sphere ,a solid cylinder and a hollow cylinder are released from the same height on an inclined plane. Which one will have the highest velocity at the base?

• solid sphere

• hollow sphere

• solid cylinder

• hollow cylinder

Q4. Two bodies A and B of masses 20 kg and 0.5 kg respectively collide head on. What will be the relationships of the impulse suffered by the two bodies?

• Impact of A greater than that of B

• Impact of B greater than that of A

• Impact of A equals that of B

• Nothing can be said

Q5. A see saw is 2 m long and pivoted at the center. If a downward force F is applied at one end, where the reaction force produced?

• At the center

• exactly at the opposite end

• at the same point directed upwards

• none of these

Q6. Imagine you push a block, so that it accelerates. How the block moves if action must be equal to the reaction?

• Newton's third law is not applicable for accelerating bodies

• It is a shortcoming of the Newton's third law

• You are being pushed backwards by the block but your feet push the ground producing another reaction force which overcomes the first reaction force

• Since in this situation Newton's second law is applicable

Q7. A mass, m is hanging by a thread. The earth is pulling it by a force = m g. Where is the reaction force?

• At the center of the body

• At the center of the earth

• At the opposite end of the thread

• None of these

Q8. There are three inclined planes with angles 30^o , 45^o and 60^o respectively. If a mass is released from same height on the three inclined planes on which one will it take maximum time to reach the bottom (friction=0)?

• 30^o

• 45^o

• 60^o

• equal time

Q9. A rod which can rotate in the vertical plane, on an axis through its end. Which one of the following is correct about its angular acceleration.

• Its angular acceleration is maximum when it is horizontal

• Its angular acceleration is constant

• Its angular acceleration is zero

• Its angular acceleration is maximum when it is vertical

Q10 When you push a container containing liquid, the liquid level rises in the side opposite to the direction of motion This happens because of

• Conservation of energy

• Newton's first law of motion

• Momentum being constant

• Friction at the base of the container