PHYSICS BASIC CONCEPT

What is the dimension of Force?

• LT-1

• MT-1

• ML-1

• ML2T-2

Which statement is always TRUE for vector quantity?

• Only direction matters

• Only magnitude matters

• It must have magnitude and direction

• Only units matter

Which of the following lists contains only scalar quantities?

• Mass, acceleration, temperature, kinetic energy

• Kinetic energy, velocity, length, pressure

• Mass, kinetic energy, pressure, volume

• Moment, acceleration, density, volume

Which of the following pairs includes a vector quantity and a scalar quantity?

• Displacement, force

• Power, speed

• Force, kinetic energy

• Work, pressure

If the kinetic energy of two masses of 3 kg and 5 kg is the same, what is the ratio of the momentum of 3 kg mass to that of the 5 kg mass?

• √3/√5

• 5/3

• 5/3

• √5/√3

The principle of conservation of linear momentum states that

• momentum equals the product of mass and velocity

• momentum is conserved in a collision

• if the force is constant, then momentum is conserved

• if there is no external force, then momentum is conserved

A particle of mass m moving with velocity v strikes a stationary particle of mass 2m and sticks to it. The final speed of the system will be

• v/2

• 2v

• v/3

• 3v

An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will

• moves in the opposite direction at 20 m/s.

• moves in the opposite direction at a lower speed.

• moves in the opposite direction at a higher speed.

• none of the above

Which of the following quantities are conserved in an inelastic collision?

• Yes Yes Yes

• Yes Yes No

• Yes No Yes

• No Yes Yes

A ball is moving with constant velocity. After some time, it collides with a wall. Which one of the following remains conserved except momentum?

• Energy

• Power

• Displacement

• Force