Physics-exam

What is the difference between speed and velocity?

• Speed has magnitude and direction; velocity has magnitude only.

• Speed has magnitude and direction; velocity has direction only.

• Speed has magnitude only; velocity has magnitude and direction.

• Speed has magnitude only; velocity has direction only.

The diagram shows a car of mass 1000 kg travelling along a straight, horizontal road. The driving force from the car’s engine is 3000N. The total resistive force acting on the car is 2500 N.

What is the acceleration of the car along the road?

• 0.50 m / s²

• 2.0 m / s²

• 3.0 m / s²

• 5.5 m / s²

An object moving at speed v has kinetic energy E. What is the speed of the object when its kinetic energy is 4.0E?

• 0.25 v

• 2.0 v

• 4.0 v

• 16 v

A passenger lift (elevator) has a total weight of 4000 N, including the people inside it. The power output of the lift motor is 800 W. How much time does it take for the lift to rise 12 m vertically?

• 2.4 s

• 6.0 s

• 24 s

• 60 s

What happens to the temperature of a substance as it is melting and as it is boiling?

• A

• B

• C

• D

The diagram shows how a thin, converging lens forms an image of an object. One principal focus of the lens is labelled F. How is the image described?

• enlarged, upright and real

• enlarged, upright and virtual

• diminished, inverted and real

• diminished, inverted and virtual

Which statement about sound is correct?

• An echo is produced by refraction of sound waves.

• The amplitude of a sound wave affects the pitch of a sound.

• The approximate range of audible frequencies for a human is 20 Hz–20kHz.

• Sound waves travel more quickly in a vacuum than in air.

A plastic rod is rubbed with a cloth and the rod becomes positively charged. Why does this happen?

• Electrons move from the cloth to the rod.

• Electrons move from the rod to the cloth.

• Protons move from the cloth to the rod.

• Protons move from the rod to the cloth.

The resistance of a wire is 20 . A second wire is made of the same material. The second wire is four times as long and has half the cross-sectional area of the first wire. What is the resistance of the second wire?

• 10 Ohm

• 40 Ohm

• 80 Ohm

• 160 Ohm

Which row shows how lamps are connected in a lighting circuit in a house and gives an advantage of connecting them in this way?

• A

• B

• C

• D