Clementi Town Secondary SchoolPreliminary Examination 2006

Secondary 4 Express & 5 Normal (Academic)

SCIENCE (PHYSICS, CHEMISTRY) 5152/01

Paper 1 Multiple Choice Duration : 1 hour

Additional Materials provided : Objective Test Answer Sheet (OTAS)

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READ THESE INSTRUCTIONS FIRST

Write in soft pencil.Do not use staples, paper-clips, highlighters, glue or correction fluid.Write your name, class and index number in the spaces at the top of this page and on the OTAS.

There are forty 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 record your choice in soft pencil on the OTAS.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer.

Hand in the OTAS separately.

Any rough working should be done in this booklet.

A copy of the Periodic Table is printed on page 15.

ANSWER SCHEME CONFIDENTIAL

1 The figures below show the readings for the measurements of the internal and external diameters of a metal pipe.

Which is the thickness of the pipe?

A 0.25 cm B 0.39 cm C 0.50 cm D 0.64 cm

5152/CTSS/TERM 3/2006

vernier scale

vernier scale

pipe

pipe

cm

cm

ANSWER SCHEME CONFIDENTIAL

2 A piece of metal has a mass of 140 g. When it was put into a measuring cylinder containing water, the water level rose as shown in the diagram.

What is the density of the metal?

A 0.14 g/cm3 B 0.50 g/cm3 C 2.0 g/cm3 D 7.0 g/cm3

3 Two metal balls of different mass both fall freely from rest from the same height at the same time.Which of the following statements is wrong?

A At any moment, both of them have the same acceleration.B At any moment, both of them have the same height.C At any moment, both of them have the same velocity.D At any moment, both of them have the same kinetic energy.

4 A cell will deliver 3000 J of energy to a 2 W electric motor before the cell is exhausted.

For which period of time will the motor run?

A 25 minutesB 100 minutesC 1500 minutesD 6000 minutes

5 Water left in a beaker evaporates. What happens during evaporation?

A High energy molecules escape and the water gains thermal energy from the surroundings.

B High energy molecules escape and the water loses thermal energy to the surroundings.

C Low energy molecules escape and the water gains thermal energy from the surroundings.

D Low energy molecules escape and the water loses thermal energy to the surroundings.

50.0 cm3

70.0 cm3

ANSWER SCHEME CONFIDENTIAL

6 In a theme park ride, passengers in a car are initially at rest at the top of the track. The car then travels down and round a circular loop in the track.

What form of energy is possessed by the car and passengers at points X and Y?

X YA kinetic energy only gravitational potential energy onlyB gravitational potential energy only kinetic energy onlyC kinetic energy only kinetic and gravitational potential energyD gravitational potential energy only kinetic and gravitational potential energy

7 The hot water for a house can be produced by using copper panels to absorb solar energy, through which the water circulates.What is the best finish for the top surface of the copper panels?

A clear plastic C highly polishedB dull black paint D white paint

5152/CTSS/TERM 3/2006

ANSWER SCHEME CONFIDENTIAL

8 The diagram shows a ray of light traveling from air to glass. Angles x and y are as shown. The refractive index of glass is 1.5.

Which of the following are possible angles of x and y?

x yA 20.0° 38.5°B 30.0° 45.0°C 30.0° 54.5°D 35.0° 60.0°

9 P is a ray of light incident on a rectangular glass block.

Which of the four rays shown, A, B, C, D is most likely to represent the path of the ray from the block after refraction?

x

y

air

glass

P

ABCD

ANSWER SCHEME CONFIDENTIAL

10 The diagram shows how displacement varies with time as a wave passes a fixed point.

What is the frequency of this wave?

A 4.0 Hz B 2.0 Hz C 0.50 Hz D 0.25 Hz

11 When a positively charged rod is touched by someone, why does it become neutral?

A because protons enter the rodB because protons leave the rodC because electrons enter the rodD because electrons leave the rod

12 A piece of paper, which is initially uncharged, is picked up by a charged rod. Which one of the following diagrams correctly shows the electric charges involved?

5152/CTSS/TERM 3/2006

0

displacement (m)

time (s) 1 2 3 4

0.10

-0.10

–+

+ +

+ +++

+ +

+ ++–

+ +

+ +

+ +

+ +

A B C D

ANSWER SCHEME CONFIDENTIAL

13 The diagrams show oscilloscope traces of sounds picked up by microphones. Which trace shows the loudest, low-pitched sound?

14 A piece of wire 0.50 m long has a cross-sectional area of 1.0 mm2. What wire of the same material has twice the resistance?

length / m area / mm2

A 0.50 0.5B 0.25 2.0C 0.25 1.0D 0.50 2.0

15 A current of 3 A flows in a circuit for 5 minutes. What is the amount of charge passing through the circuit?

A 0.01 C B 15 C C 100 C D 900 C

A

B

C

D

time / s

time / s

time / s

time / s

amplitude / mm

amplitude / mm

amplitude / mm

amplitude / mm

ANSWER SCHEME CONFIDENTIAL

16 Three identical electric bulbs rated 3 V 1 W are connected as shown in the diagram below.

Which of the following correctly describes the brightness of the bulbs?

bulb 1 bulb 2 bulb 3A dim bright brightB dim bright dimC bright bright dimD bright dim dim

17 Why is electrical energy usually transmitted at high voltage?

A As little energy as possible is wasted in the transmission cables.B The current in the transmission cables is as large as possible.C The transmission cables are safer to handle.D The resistance of the transmission cables is as small as possible.

18 The north pole of a permanent magnet is pushed towards X. The galvanometer deflects to the left.

Which of the following will produce a deflection in the opposite direction?

A pulling the N-pole out of end YB pulling the S-pole out of end XC pushing the N-pole into end YD pushing the S-pole into end Y

5152/CTSS/TERM 3/2006

2 3

1

3 V

N SXY

ANSWER SCHEME CONFIDENTIAL

19 A permanent magnet is placed on a flat horizontal surface. A plotting compass is placed on the spot as shown on the diagram.

In which diagram will the plotting compass point? (Ignore any effect of the Earth’s magnetic field.)

A B C D

20 Three different radioactive sources gave the following track patterns in a cloud chamber.

S1 S2 S3

What type of sources were S1, S2, and S3?

S1 S2 S3

A α β γB γ α βC β α γD α γ β

N

S

N

S

N

S

N

S

N

S