Physics Quiz

The periodic time of a simple pendulum can be increased by

• increasing the length oft he cord

• decreasing the length of the cord

• increasing the mass of the bob

• decreasing the amplitude of oscillation

2 µm means

• 2 x l0 ⁶ rn

• 2 x 10³ rn

• 2 x 10^-6 m

• 2 x 10^-3 m

A falling raindrop reaches a constant speed when

• there is no net force acting on it

• the pull of the earth on the raindrop is equal to the weight of the raindrop

• the upthrust due to the air is at a

  minimum

• the air surrounding the raindrop becomes saturated with water vapour

Which of the following measurements has THREE SIGNIFICANT figures?

• 0.0293 kg

• 0.94 A

• 5.321 v

• 10.42 m

A stable well designed racing car must have a

• low centre of gravity

• narrow wheel base

• sunroof

• long front

"When body A exerts a force on body B, body B exerts an equal and opposite force on body A. " This principle is attributable to which of the following scientists?

• Aristotle

• Einstein

• Galilee

• Newton

If the resultant force on an object is zero, the object will move with

• decreasing velocity

• constant velocity

• constant acceleration

• increasing velocity

Two smooth spheres, A and B, coIIide head on. Which of the following statements is/are true?

I. The momentum of A is the same after collision as it was before.

II. The momentum of B is the same after collision as it was before.

III. The total momentum of A and B is

the same after collision as it was be tore.

• I only

• Ill only

• ll and lll only

• I, II and Ill

Which of the following is a scalar quantity?

• Energy

• Acceleration

• Velocity

• Weight

A ball attached to a string is whirled round at a constant speed in a horizontal circle. It is true to say that

• the velocity is constant

• there are no forces acting on the body

• the motion is accelerated

• if the string breaks the ball drops vertically downwards