0654_2019__ON_QP_23_Phys

28. There is no resultant force acting on a body.

Which statement is correct?

• The body is either at rest or moving at constant speed in a straight line.

• The body must be at rest.

• The body is gaining speed.

• The body is losing speed.

29. Diagram 1 shows a spring with its length indicated. Diagram 2 shows the same spring with a 20 N

load hung from it, and the new length of the spring.

The spring obeys Hooke’s Law.

Which graph is the extension-load graph for the spring?

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30.A body moving at speed v has kinetic energy E.

What is the speed of the body when its kinetic energy is 4.0 E?

• 0.25 v

• 2.0 v

• 4.0 v

• 16 v

31. A student wishes to measure his average power when running up a flight of steps. The energy

transferred is 7.0 kJ and the time taken is 14 seconds.

What is the student’s average power?

• 0.0020 W

• 98 W

• 500 W

• 98 000 W

32. A glass block is surrounded by air.

Light travelling in the glass block reaches the edge of the block.

The critical angle of the glass is 42°.

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33. Which statement about real and virtual images formed by a thin converging lens is correct?

• All real images are enlarged and inverted.

• All real images can be produced on a screen.

• All virtual images are diminished and upright.

• All virtual images can be produced on a screen.

34. Which graph is the current-voltage characteristic of a filament lamp?

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35. The diagram shows a circuit containing two switches P and Q, and three lamps. One lamp is

labelled X.

Which of the switches must be closed so that only lamp X is lit?

• neither switch

• switch P only

• switch Q only

• switch P and switch Q

36.Which row shows how lamps are connected in a lighting circuit in a house and gives an

advantage of connecting them in this way?

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37. An electrical extension block has four sockets, a cable which can safely take a current of 6 A and

a plug. It is protected by a fuse rated at 5 A.

The extension block is used with four appliances and the 5 A fuse blows. The owner replaces the

5 A fuse with a 13 A fuse.

Why is the extension block now dangerous?

• The appliances may overheat before the fuse blows.

• The cable may overheat before the fuse blows.

• The sockets may burn out before the fuse blows.

• The 13 A fuse may blow too soon.