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Worksheets0654_2019__ON_QP_21_Phys
Total questions: 13
Worksheet time: 13mins
28. The diagram shows the two horizontal forces acting on a toy car of mass 2.0 kg that is moving
along a horizontal floor.
What are the resultant force on the car and its acceleration?
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?
30.An engine is doing work on a car as the car moves along a road.
Which two changes must result in less work being done on the car by the engine?
decreasing the engine’s force on the car and decreasing the distance moved by the car
decreasing the engine’s force on the car and increasing the distance moved by the car
increasing the engine’s force on the car and decreasing the distance moved by the car
increasing the engine’s force on the car and increasing the distance moved by the car
31. A machine has useful output energy of 1000 J, and wasted energy of 300 J.
Which expression is used to calculate the efficiency of the machine?
(1000+300)300×100%
1000300×100%
1000(1000−300)×100%
(1000+300)1000×100%
32. The more energetic molecules of a liquid are escaping from its surface, causing the liquid to cool.
What is happening to the liquid?
It is boiling.
It is condensing.
It is evaporating.
It is melting.
33. A transverse wave is travelling through a medium in the direction shown.
In which direction do the particles of the medium vibrate?
parallel to the line joining P to Q
parallel to the line joining Q to R
perpendicular to the line joining P to Q
perpendicular to the line joining Q to R
34. 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°.
Which row shows an angle of incidence i of the light and what happens to the light when it
reaches the edge of the glass block at this angle of incidence?
35. There is a current of 6.0 A in an electric heater.
How much electric charge passes through the heater in one minute?
0.10 C
6.0 C
10 C
360 C
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?
37. An electric kettle is rated at 3.0 kW and is connected to a 250 V supply. The kettle is switched on
for 2.0 minutes.
Which row shows the current in the kettle and the energy transferred by the kettle?
38. 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.
39. The diagram shows an electrical device.
What is this electrical device?
a d.c. motor
an a.c. generator
a transformer
a solenoid
40. Which type of radiation has the greatest ionising effect, and which is the most penetrating?
