physics test paper 20080915
DESCRIPTION
Cambridge O Level Physics test paperTRANSCRIPT
PHYSICS
READ THESE INSTRUCTIONS FIRST
Write in dark blue or black pen.You may use a soft pencil for any diagrams, graphs or rough working.Do not use staples, paper clips, highlighters, glue or correction fluid.
Section AThere are thirty questions in Section A. Answer all questions. For each question there are four possible answers A, B, C and D.Choose the one you consider correct and record your choice in soft pencil.Each correct answer will score one mark. A mark will not be deducted for a wrong answer.
Section BAnswer all questions.Write your answers in the spaces provided on the Question Paper.
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Section A
1. The diagram shows one method of measuring the diameter of a beaker.
What is the diameter of the beaker?
A 4.5 cm B 5.0 cm C 5.5 cm D 8.0 cm
Answer:……….
2. A student studies some equations.
power = work / time
force = mass × acceleration
velocity = displacement / time
How many vector quantities are contained in the equations?
A 1 B 2 C 3 D 4
Answer:……….
3. A person just supports a mass of 20 kg suspended from a rope.
What is the resultant force acting on the mass?
A 0 N B 10 N C 20 N D 200 N
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Answer:……….
4. When a block of wood of mass 5 kg is pushed along the horizontal flat surface of a bench, the friction force is 8 N.
When the block is pushed along the bench with a force of 23 N, it moves with a constant
A speed of 3 m / s.
B speed of 5 m / s.
C acceleration of 3 m / s2.
D acceleration of 5 m / s2.Answer:
……….
5. The diagram shows a strip of paper tape that has been pulled under a vibrating arm by an object moving at constant speed. The arm was vibrating regularly, making 50 dots per second.
What was the speed of the object?
A 2.0 cm / s B 5.0 cm / s C 100 cm / s D 200 cm / sAnswer:
……….
6. Three objects are cut from the same sheet of steel. They are different shapes but they all have the same mass.
Which object has the greatest density?
A the disc
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B the L-shape
C the square
D they all have the same densityAnswer:
……….7. Which part of the graph shows the limit of proportionality for an elastic solid?
A O B OP C P D PQ
Answer:……….
8. A young child holds a ball over the edge of a balcony. The ball has gravitational potential energy. The ball is then released. It falls onto a concrete path below, and bounces back up.
Which sequence represents, in the correct order, the transformations of the gravitational potential energy after the ball is released?
A → elastic potential energy → kinetic energy → chemical potential energy
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B → elastic potential energy → kinetic energy → gravitational potential energy
C → kinetic energy → elastic potential energy → kinetic energy
D → kinetic energy → gravitational potential energy → kinetic energy
Answer:……….
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9. The diagrams show a simple mercury barometer.
Which diagram shows the distance to be measured to find atmospheric pressure?
Answer:……….
10. The system shown in the diagram contains a liquid.
A downward force of 80 N is exerted on piston K.
What will be the upward force exerted by the liquid on piston L?
A 1 N
B 4 N
C 80 N
D 1600 N
Answer:……….
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11. What is a property of both liquids and gases?
A They always fill their containers.
B They are incompressible.
C They can flow.
D They have molecules in fixed positions.
Answer:……….
12. What conditions of temperature and surface area would produce the most rapid evaporation from a pool of water on a road surface?
Temperature Surface areaA High LargeB High SmallC Low LargeD Low Small
Answer:……….
13. The sensitivity of a liquid-in-glass thermometer depends on the volume of liquid used and the diameter of the bore of the thermometer.
Which changes will produce the greatest increase in sensitivity?
volume of liquid
bore diameter
A decrease decreaseB decrease increaseC increase decreaseD increase increase
Answer:……….
14. The energy required to change liquid water into water vapour at the same temperature is called latent heat of vaporisation.
What does this energy do?
A increases the average separation of the water molecules
B increases the average speed of the water molecules
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C raises the temperature of the air near the water
D splits the water molecules into their separate atoms
Answer:……….
15. A 2 kW kettle containing boiling water is placed on a balance. It is left there and continues to boil for 5 minutes. The balance reading changes by 0.2 kg.
What does this information give as a value for the specific latent heat of vaporisation of water?
A 2000 J / kg
B 3000 J / kg
C 50 000 J / kg
D 3 000 000 J / kg
Answer:……….
16. The heat from the hot water in a metal radiator passes through the metal and then spreads around the room.
What are the main processes by which the heat is transferred through the radiator and then spread around the room?
through the metal
radiator
around the room
A conductionConduction
B conductionConvection
C radiationConduction
D radiationConvection
Answer:……….
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17. Three students stand 2 m apart in front of a plane mirror which is 3 m long.
Student Y is standing opposite the mid-point of the mirror.
How many students can see the images of the other two?
A 0 B 1 C 2 D 3
Answer:……….
18. A wire has a resistance of 8 Ω. A second wire, made of the same material, has half the length and twice the cross-sectional area.
What is the resistance of the second wire?
A 1 Ω B 2 Ω C 8 Ω D 16 Ω
Answer:……….
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19. Two resistors of 6 Ω and 12 Ω are arranged in parallel. A p.d. is connected across the terminals X and Y.
The current through the 6 Ω resistor is 4 A.
What is the current in the ammeter?
A 4 A B 6 A C 8 A D 12 A
Answer:……….
20. Which of the following would cost the least if operated from the same voltage supply?
A a 5000 W electric cooker used for 1 minute
B a 1000 W electric fire used for 10 minutes
C a 500 W electric iron used for 1 hour
D a 100 W lamp used for 1 day
Answer:……….
21. A house-owner replaces a failed fuse for the lights of the house. When the lights are switched on, the second fuse also fails.
The house-owner then uses a third fuse with a higher rating than the previous two.
Why is this not a sensible thing to do?
A Fuses only allow the circuit to work if the rating is exactly right.
B The third fuse will melt because the rating is too high.
C Using a fuse with too high a rating causes electric shocks.
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D The circuit may work, but the fault is not corrected.
Answer:……….
22. Some water is poured into four tubes of different cross-sectional areas.
Which tube contains the largest volume of water?
Answer:……….
23. What are the correct units for force and for weight?
Answer:……….
24. The gas in a container is heated but is kept at constant volume.
Why does the gas pressure increase?
A The molecules expand.
B The molecules increase in mass.
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C The molecules move further apart.
D The molecules move more rapidly.
Answer:……….
25. The table lists the melting points and the boiling points of four different substances A, B, C and D.
Which substance is a gas at 25 °C?
Answer:……….
26. The circuit shows a current I in a resistor of resistance R.
Which line gives possible values of I and of R?
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Answer:……….
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27. The circuit shown in the diagram contains an unknown component X, hidden in a box.
The voltage-current graph for X is as shown.
What is the component X?
A a capacitor
B a closed switch
C a metallic resistor
D an open switch
Answer:……….
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28. Four lamps are connected in a circuit as shown in the diagram.
Each lamp is designed to operate at 12 V.
The circuit is now switched on.
Which statement is correct?
A Each lamp can be switched off independently.
B If one lamp breaks all the others will stay alight.
C The current is the same in all the lamps.
D The lamps will all light at normal brightness.
Answer:……….
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29. The diagram shows a battery connected to three identical resistors. Four ammeters A, B, C and D are connected in the circuit.
Which ammeter shows the smallest reading?
Answer:……….
30. A person uses chemical energy to run up some stairs.
She stops at the top of the stairs. What has the chemical energy been converted to when she is at the top of the stairs?
A kinetic energy and gravitational energy
B kinetic energy and strain energy
C gravitational energy and heat energy
D strain energy and heat energy
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Answer:……….
Section B
Answer all the questions in this section.
1. Fig. 1.1 represents the motion of a car along a straight road. As the car approaches a small town, it slows down. The car travels at a constant speed from the start of the town to the end of the town. After passing through the town, the car speeds up.
(a) (i) Determine the speed of the car in the town.
speed = ................................................. [1]
(ii) Determine the time taken by the car to pass through the town.
time taken = .......................................... [1]
(iii) Calculate the distance travelled by the car in the town.
distance = .............................................. [1]
(b) The car accelerates after passing through the town.
Calculate the acceleration. Give the unit of your answer.
acceleration = ........................................ [3]
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2. Fig. 2.1 shows apparatus that demonstrates how a coin and a piece of paper fall from rest.
At the positions shown in Fig. 2.1, the coin and paper are falling through air in the tube.
Theforces on them are shown in Fig. 2.2. The length of an arrow indicates the size of each force.
(a) State the initial value of the acceleration of the coin as it falls.
................................................................................................................................... [1]
(b) Explain how Fig. 2.2 shows that
(i) the paper falls with constant speed,.................................................................................................................................
.................................................................................................................................
(ii) the coin accelerates..................................................................................................................................
.................................................................................................................................[3]
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(c) A vacuum pump is connected to A and the air in the tube is removed.
The coin and paper fall differently in a vacuum from the way they fall in air.
State two of these differences.1. .....................................................................................................................................
.........................................................................................................................................
2. .....................................................................................................................................
................................................................................................................................... [2]
3. Three horizontal rods are placed with one end just above a Bunsen flame. The other end of each rod is coated with wax, as shown in Fig. 3.1.
(a) Describe how you would use the apparatus to discover which rod is the best conductor of heat.
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
................................................................................................................................... [2]
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(b) Two metal teapots are identical except that one is black on the outside and the other is white on the outside, as shown in Fig. 3.2.
The teapots each contain the same amount of hot water.
State and explain which teapot will cool down more quickly.
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
................................................................................................................................... [3]
4. (a) Fig. 4.1 shows a ray of light incident on a mirror at X. The incident ray makes an angle of 50° with the surface of the mirror.
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(i) Complete Fig. 4.1 to show the normal and the reflected ray at X. [1]
(ii) State the values of
1. the angle of incidence, ............................................... [1]
2. the angle of reflection. ............................................... [1]
(b) Describe with the help of a diagram how you would find the position of the imageproduced by a plane mirror.
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
.........................................................................................................................................
................................................................................................................................... [3]
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5. Fig. 6.1 shows a device used to generate electricity. Water entering at the top turns the wheel. A generator connected to the wheel produces electric current.
(a) State the two main energy changes that take place in this device as water starts toflow.
1. .....................................................................................................................................
2. ............................................................................................................................... [2]
(b) The change in the potential energy of the water every second is 2000 J. The electrical energy output is 1200 J every second.
Calculate the efficiency of the process.
efficiency = ............................................ [2]
(c) State two ways in which the device wastes energy.
1. .....................................................................................................................................
2. ............................................................................................................................... [2]
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6. Fig. 8.1 shows an electrical circuit using two resistors.
(a) The switch S is open and the ammeter reading is zero.
State the value of the potential difference across the 6_ resistor.
potential difference = ............................. [1]
(b) Switch S is now closed.
(i) State the value of the total resistance of the circuit.
resistance = .............................................[1]
(ii) Calculate the current in the ammeter. State clearly the formula that you use.
current = ..................................................[2]
(iii) Calculate the potential difference across the 6_ resistor.
p.d. = .......................................................[2]
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