Name: _______________________________ Reg. No: _____ Class: 4/_____________________________________________________________________________

CLEMENTI WOODS SECONDARY SCHOOL

MID-YEAR EXAMINATION 2012

PHYSICS 5058/01Paper 1

Secondary 4 Express

1 hour

3 May 2012___________________________________________________________________________

READ THESE INSTRUCTIONS FIRST

Write your name, register number and class on all the work you hand in.

Do not use staples, paper clips, highlighters, glue or correction fluid.

There are 40 questions in this paper. Answer all questions.For each question, there are four possible answers, A, B, C and D. Choose the one you consider correct and shade your choice with soft pencil on the separate Answer Sheet (OAS).

At the end of examination, hand in your Answer Sheet and the question paper separately.

Each correct answer will score one mark. No mark will be deducted for a wrong answer.

_________________________________________________________________________This question paper consists of 13 printed pages.

CWD PHY 4E P1 MY12 1

1 A micrometer is used to measure the thickness of a sheet of glass.

With the jaws closed and no glass sheet, the micrometer reading is shown in diagram 1.

With the jaws closed around the glass sheet, the micrometer reading is shown in diagram 2.

What is the thickness of the glass sheet?

A 2.05 mm B 2.30 mmC 2.55 mm D 2.80 mm

2 A car is travelling from point X to point Y along a straight path and the diagram shows the speed-time graph of the car.

Which of the following statements about the car is/are true?

I The car has returned to its start point X after 13 s.II In interval PQ, the car moves at constant acceleration.III The car is moving towards the start point X in interval RS.

A I only B II onlyC I and II only D II and III only

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P

Q R

S

3 A 2 kg block is pulled by a horizontal force of 10 N and moves with an acceleration of 1 m s-2 on a rough horizontal surface.

What is the frictional force acting on the block?

A 0 N B 8 NC 10 N D 12 N

4 Joel is unable to lift an object of mass 500 kg on the Earth, but is able to do so on the Moon.

This is because

A the mass of the object is smaller on the Moon.B the weight of the object is smaller on the Moon.C the density of the object is smaller on the Moon.D the volume of the object is smaller on the Moon.

5 A submarine is accelerating through the water at a constant depth. It is being acted by four forces as shown.

Which of the following statements is correct?

A The upthrust is balanced by the weight.B The resultant force of the four forces is zero.C Gravity has no effect on the submarine.D The water resistance is balanced by the propelling force.

6 An astronaut of mass 80 kg jumped out of the rocket after it had landed on Jupiter. The astronaut took 0.40 s to drop for 2.0 m.

What was the weight of the astronaut on Jupiter?

A 800 N B 1 000 NC 1 800 N D 2 000 N

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propelling force

upthrust

weight

water resistance

7 In order to balance the uniform rod XY, what is the force F required to act at end Y? [Gravitational field strength = 10 N kg-1]

A 10 N B 11 NC 55 N D 65 N

8 A box is balanced at the edge of a table as shown.

Which point is possibly the centre of gravity of the box?

9 The speed-time graph below shows the motion of a motorcar on a level road within a 10 s duration. Given that the mass of the motorcar is 500 kg and the frictional force along the road is 120 N, what is the power of the motorcar?

A 3200 W B 4160 WC 32 000 W D 41 600W

10 Which of the following animals is more likely to live in muddy terrain?

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table

t/s100

12

4

v/ m s-1

A small feet and covered with featherB small feet and has large massC big feet and has big volumeD big feet and has small mas

11 Substances in gaseous state are less dense than when they are at liquid or solid state. This is because

A the molecules at gaseous state expand more than when they are in liquid or solid state.

B the space between two molecules in gaseous state is wider than when it is in solid state and liquid state.

C the molecules in gaseous state are in Brownian motion.D the molecules in gaseous state have smaller mass than when they are at liquid or

solid state.

12 Object P is 2 kg. It has a temperature of 40 oC and has an internal energy of 500 000 J. Object Q is 2 kg. It has a temperature of 50 oC and has an internal energy of 400 000 J.

Which of the following statements is correct?

A Heat flow from object P to object Q.B Heat flow from object Q to object P.C No heat flow between object P and object Q.D There is not enough information to determine the direction of heat flow.

13 Which of the following arrangements best minimises the rate of thermal energy transfer?

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heat heat heat heat

key

tightly packed feather

loosely packed feather

air

heat heat heat heat

key

tightly packed feather

loosely packed feather

air

14 Pure steam at 100 oC is blown into a beaker of cold water at 5 oC.

Which of the following will increase after some time?

I mass of water in the beakerII density of water in the beakerIII temperature of water in the beaker

A I and II only B I and III onlyC II and III only D I, II and III

15 Which of the following methods would not produce convection currents in a container filled with water at 30 oC?

A floating a piece of ice on the waterB lighting a candle beneath the containerC dropping a piece of hot metal into the waterD placing a 100 W lighted bulb just above the water surface

16 A piece of lead is allowed to fall to the ground and as a result of its impact, its temperature rises. The final temperature of the lead depends on each of the following except

A the height through which it falls. B its mass.C its specific heat capacity. D its initial temperature.

17 A gas heater raises the temperature of 5 kg of water by 30 oC in 10 minutes. How long will it take the same heater to raise 15 kg of oil through the same temperature rise if the specific heat capacity of water is twice that of oil?

A 5 min B 6.7 minC 15 min D 30 min

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cold water

steam

18 A light ray in a liquid strikes an air bubble as shown. Which of the following rays is a possible outcome after striking the surface of an air bubble?

A I and II only B I and III onlyC II only D III only

19 Which of the following is not true about reflection and refraction?

A Both change the direction of travel of light.B The incident angle, the normal and the reflected or refracted angle lie in the same

plane.C Both result in a change of speed of light.D Both phenomena can happen in all transparent media.

20 A converging lens is used to form an image of an object on a screen. If the bottom half of the lens is covered with a cardboard, which of the following statements is correct?

A The top half of the image disappears.B The bottom half of the image disappears.C The image is dimmer.D The image is smaller.

21 A wave of frequency 5.0 Hz travels 96 m in 2.0 min.

Calculate the wavelength of the wave.

A 0.16 m B 4.0 mC 96 m D 240 m

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I

II

III

Incident ray

22 Which of the following is not true about electromagnetic waves?

A Ultraviolet rays travel faster than infrared radiation in air.B Gamma rays are more harmful than radio waves.C Microwaves are transverse waves.D Visible light can travel in vacuum.

23 Which of the following has the lowest frequency?

A infrared radiation B microwaveC visible light D X-rays

24 A series of compressions and rarefactions of a sound wave is shown below.

Given that the sound wave has a frequency of 1600 Hz and a speed of 320 m s -1, calculate the distance between P and Q.

A 0.3 m B 0.4 mC 0.6 m D 0.8 m

25 Which of the following statements is/are true about sound?

I A loud sound travels faster than a soft sound.II A high pitch sound travels faster than a low pitch sound.III A sound with short wavelength has a higher pitch than a sound with a longer

wavelength.

A I and II only B I and III onlyC III only D I, II, and III

26 Which of the following is not possible?

A A man knocks at one end of a long metal pipe and another man hears the knock at the other end.

B An explosion is heard by an astronaut when a laser beam hits an enemy fighter in space.

C A whale hears another whale in the deep sea.D A mole hears another mole underground.

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P Q

27 An electric bell is suspended in a bell jar as shown. An observer outside the bell jar can see the hammer striking the bell but cannot hear any sound produced by the striking. What is a possible reason?

A The bell jar is filled with water. B The bell jar is filled with inert gas.C The bell jar has very thick glass. D There is a vacuum in the bell jar.

28 A sound wave of a mobile phone ring tone is displayed on a screen.

Which of the following shows a sound wave which is softer and has a higher pitch?

29 When a teacher is talking in an enclosed conditioned classroom, the students do not hear echo because

I the wall is not big enough.II sound travels too fast.III the sound energy is absorbed by students and furniture.

A I and II only B I and III onlyC II and III only D I, II and III

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bell jar

bellhammer

A B DC

30 Which of the following is the unit for charge?

A coulomb B ohmC volt D watt

31 An electron, e, is placed near a positive point charge as shown.

In which direction will the electron move?

32 The graph shows how the current in a lamp and in a resistor varies with the potential difference applied.

Given that the lamp and the resistor are connected in parallel to a 9 V supply, determine the effective resistance of the circuit.

A 1.6 ΩB 5.6 ΩC 23 ΩD 30 Ω

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e

9 V

resistor

lamp

V/V

I/A

33 Two identical lamps light up with normal brightness when connected in series to a battery.

A third lamp is then connected to one of the lamps as shown.

What happens to the brightness of the two lamps?

lamp 1 lamp 2A becomes brighter becomes brighterB becomes dimmer becomes dimmerC becomes brighter becomes dimmerD becomes dimmer becomes brighter

34 An electric kettle is accidently dropped onto the floor and the impact causes the live wire to make electrical contact with the metal case. The case is earthed and the plug to the electric kettle contains a 4 A fuse.

Given that the normal working current for the kettle is 3 A, what will happen when the circuit is switched on?

A The fuse will not melt and current will flow to the Earth continuously.B The fuse will melt and current will flow to the Earth continuously.C The fuse will not melt and current will not flow to the Earth continuously.D The fuse will melt and current will not flow to the Earth continuously.

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lamp 1 lamp 2

lamp 1 lamp 2

35 A kettle has a label stating '240 V, 750 W'. The table shows the maximum current that may be carried safely by wires of different diameters.

From the table, select the smallest diameter of wire which can be safely used for this kettle.

wire diameter/ mm maximum current / A

A 0.10 1.0B 0.15 2.3C 0.20 4.0D 0.25 6.3

36 A variable resistor and a light bulb are connected in parallel to a battery and the lamp shines brightly.

When the resistance of the variable resistor is halved, the bulb will

A probably burn out. B shine more brightly.C shine much less brightly. D hardly change in brightness.

37 The circuit shows four identical light bulbs connected to a 6 V battery.

Which bulb/bulbs is/are the dimmest?

A Q only B P and R onlyC S only D P, R and S only

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Q

PS

R

38 A heater to be used on a 240 V mains circuit, has a 5 A fuse fitted to the plug.

Which of the following is the most powerful heater that can be used with this fuse?

A 50 W B 220 WC 1 000 W D 1 300 W

39 Mrs Loo uses a 6 kW hair dryer for 5 minutes and a 1.5 kW air conditioner for 8 hours.

Given that 1 kWh costs 28 cents, calculate the cost of using these appliances.

A $ 3.50 B $ 11.76C $ 16.80 D $ 35.00

40 A house-owner replaced a failed fuse for the light of the house. When the lights were switched on, the new fuse also failed. The house-owner then used another fuse with a higher rating than the previous two.

Why was this not a sensible thing to do?

A Fuses allow the circuit to work only if the rating is exactly right.B The fuse has already melted because the rating was too high.C Using a fuse with too high a rating would cause electric shocks.D A fuse with a higher rating might allow the circuit to work, but the fault would not

be corrected.

End of Paper

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