Paper 1 Mock Exam Review

Which of the following is a scalar quantity?

• momentum

• kinetic energy

• acceleration

• velocity

A tennis ball is released from rest at a height h above the ground. At each bounce 50 % of its kinetic energy is lost to its surroundings. What is the height reached by the ball after its first bounce?

• h/4

• h/2

• h

• 0

The efficiency of an electric motor is 20 %. When lifting a body 400 J of energy is wasted. What is the useful work done by the motor?

• 25 J

• 100 J

• 200 J

• 800 J

The gravitational field strength at the surface of Earth is g. Another planet has half the radius of Earth and the same density as Earth. What is the gravitational field strength at the surface of this planet?

• g/2

• g/4

• g/32

• g/64

Two forces of magnitudes 7 N and 5 N act at a point. Which one of the following is not a possible value for the magnitude of the resultant force?

• 1 N

• 3 N

• 5 N

• 7 N

A fixed mass of gas at kelvin temperature T has its pressure tripled and its volume doubled. What is its new temperature?

• 2T/3

• 3T/2

• 6T

• T/6

A gas is compressed to a smaller volume at constant temperature. The best microscopic explanation for the increase in pressure is that at the smaller volume

• gas molecules are more compressed

• gas molecules repel each other more strongly

• gas molecules are moving faster

• gas molecules are hitting the walls more frequently

What statement about X-rays and ultraviolet radiation is correct?

• X-rays travel faster in a vacuum than ultraviolet waves.

• X-rays have a higher frequency than ultraviolet waves.

• X-rays cannot be diffracted unlike ultraviolet waves.

• Microwaves lie between X-rays and ultraviolet in the electromagnetic spectrum.

A stone of mass m is attached to a string and moves around in a horizontal circle of radius R at constant speed V. The work done by the pull of the string on the stone in one complete revolution is

• zero

• 2πmV^2

• 2πmV^2 / R.

• 2πmV / R.

Two points P and Q are at distances r and 2r respectively from the center of a compact disc. When the disc is rotating about its center, the ratio of (acceleration at P / acceleration at Q) is

• ½

• 1

• √2

• 2