SMJK PEREMPUAN CHINA PULAU PINANG

PEPERIKSAAN PERCUBAAN SPM 2011

PHYSICS 4531/1

Paper 1

Sept 2011

11 hours

4

DO NOT OPEN THIS BOOKLET UNTIL YOU ARE TOLD TO DO SO.

1. Answer all questions.

2. Shade your answers in the OMR form given.

3. Usage of non-programmable scientific calculator is allowed.

This question paper consists of 12 printed pages.

2

1 Which of the following is not true about errors?

A Random errors are caused by factors that are beyond the control of the observers. B A higher degree in error results in a lower accuracy in the measurement.

C Systematic error can be eliminated by repeating the experiment.

D Parallax error can be a source of systematic error.

Questions 2 and 3:

The figure below shows a stroboscopic photograph of a free falling ball of mass 0.2 kg.

2 The ball is dropped from point W which is 25 m above the ground. Given the frequency of the stroboscope is 10 Hz. Find the distance between Y and Z. (g = 10 m s

-2)

A 0.25 m B 0.35 m C 0.45 m D 0.50 m

3 Determine the total number of images captured by the camera before the ball hits the ground.

A 25 B 23 C 22 D 20

4 A student carried out an experiment to investigate the relationship between the length of a

pendulum, l and the period of its oscillation, T. The relationship is found to be 2l T . Which

of the following graphs shows the relationship between l and T?

A B C D

5 The following phenomena involves the principle of conservation of momentum except

A A rifle recoils backwards when firing a bullet.

B A squid propelling itself in the water. C A hot air balloon rising in the air.

D A helicopter hovering in the sky.

6 A student tries to push a large vertical wall down. He pushes with the maximum force that he can exert and the wall does not move. Which of the following statements is true about the

situation?

A The work done by the wall on the student is greater than the work done by the student on the wall.

B The force the student acts on the wall is larger than the reaction force of the wall.

C The reaction force of the wall is larger than the force the student acts on the wall. D The work done by the student is zero.

Figure 1

W

X

Y

Z

Ball

T

l

T

l

T2

l

T2

l 0

0

0

0

3

7

A block of mass, m kg lies on a smooth inclined plane with an external force, F acting on it.

Which of the following vector polygons represents correctly the forces acting on the block?

A B C D

8

Figure 3 shows two extension, x against force, F graphs of two springs, U and T. Both U and T

are made of same material. Which of the following is(are) true? I. Spring U is thicker than spring T.

II. Diameter of coil U is larger than coil T.

III. Spring U is longer than spring T. IV. Spring U is stiffer than spring T.

A I and II only B I and IV only C II and III only D III and IV only

9

Figure 4 shows a wooden block being dragged by a force, F. What is the acceleration

experienced by the wooden block?

A 1.5 m s-2 B 3.0 m s

-2 C 4.5 m s

-2 D 9.0 m s

-2

10

Figure 5 shows a car of mass 1000 kg moving with a speed of 30 m s-1 crashes into a wall and

comes into a stop. The passenger of mass 50 kg tries to cushion the impact with his legs during the collision. What is the impulse on his legs?

A 1 500 N s B 15 000 N s C 30 000 N s D 300 000 N s

F

Figure 2

Figure 3

F (N)

U

T

Figure 4

Figure 5

4

11

Figure 6 shows two spring balances attached to an object at rest. The readings on the spring

balance are 173 N and 100 N respectively. Which of the following is true?

A The weight of the object is 273 N. B The net force acting on the object is 200 N.

C There is a net vertical force acting on the object.

D If the system is accelerating to the left, reading of A increases while B decreases.

12

Figure 7 shows a bottle of soy sauce with a small opening on top of it. A few drops of soy

sauce drip out from the bottle immediately after the bottle is turned up side down. Which of the following statements best describes the situation above?

A The gas pressure in the bottle in Figure 7(b) is higher than the atmospheric pressure.

B The gas pressure in the bottle in Figure 7(b) is less than the atmospheric pressure.

C The gas pressure in the bottle in Figure 7(b) is equal to the atmospheric pressure.

13

A hydrometer is immersed into a liquid at room temperature. What would happen to the

hydrometer if the liquid is heated to a higher temperature?

A It floats higher. B It sinks lower.

C It remains unchanged.

Figure 6

A B

Figure 7

(a) (b)

Soy sauce

Opening

Figure 8

5

14 Which of the followings does not show a way of reducing the pressure?

A

B

C

D

15

Figure 9 shows a uniform glass tube containing a column of air trapped by a column of

mercury. When the temperature is 27 °C, the length of the air column is 20 cm. What is the length of the air column when the temperature is 67 °C? (Pressure of air column is constant.)

A 8 cm B 18 cm C 23 cm D 50 cm

16 A tortoise hidden in the shallow and calmer region of river bank would be swept away by the

river water if the current in the middle region of the river is too strong. Which of the following

principles best explains the situation? A Archimedes’ principle

B Pascal’s principle

C Bernoulli’s principle D Boyle’s law

17 Evaporation in a liquid

A causes a drop in temperature of the liquid.

B reduces the force between the molecules of the liquid.

C does not cause any change in the temperature of the liquid. D decreases the distance between the molecules of the liquid.

18 Which of the following statements is not true in describing the changes that occur when water turns into ice?

A The volume increases.

B The temperature drops.

C The molecules are rearranged. D Latent heat of fusion is released.

19 An object is placed in front of a concave mirror. If the distance of the object from the mirror is less than the focal length, what are the characteristics of the image?

A Virtual, upright and diminished.

B Virtual, uptight and magnified.

C Real, inverted and diminished. D Real, inverted and magnified.

Figure 9

6

20 A few students end up with different ray diagrams as shown below. The convex lens has its principle focus at F. which diagram shows the correct path of the light rays?

A

C

B

D

21 Which diagram best represents the paths of two parallel rays of light through a glass prism?

A

B

C

D

22 Figure 10 shows a light ray directed into a glass block. Which is correct emergent ray at the

other side of the glass block?

23

The graph above shows how the image distance, v varies with linear magnification, m of a converging lens. What is the focal length of the lens?

A 7.5 cm B 10 cm C 15 cm D 20 cm

24 Which of the following statements is not true about a compound microscope?

A The eyepiece is thinner than the objective lens.

B The image formed by the eyepiece is real and magnified. C The image formed by the objective lens is real and magnified.

D Focal length of objective lens is shorter than focal length of eyepiece.

Figure 10

Incident ray

Glass block

Figure 11

7

25 Figure 12 shows a mirror tilted at an angle of 20° to the floor.

A ray of light is directed so that it hits the mirror at an angle of 30° to the surface of a mirror.

What are the angles of incidence and reflection? Angle of incident Angle of reflection

A 30° 30° B 30° 60°

C 50° 50°

D 60° 60°

26 The refractive index, n of a medium can be determined by all the following methods, except

A real depth

apparent depthn

C frequency of light in air

frequency of light in the mediumn

B speed of light in air

speed of light in the mediumn

D wavelength of light in air

wavelength of light in the mediumn

27 Figure 13 shows a string with two wave pulses on it, one travelling in each direction.

Which diagram below shows the instance when the two pulses arrive at X?

A B C D

28

Figure 14 shows water waves travelling through shallow water to deeper water.

Which statement is correct?

A The frequency of the wave remains the same.

B The wavelength of the wave decreases. C The amplitude of the wave increases.

D The speed of the wave decreases.

Figure 12

Figure 13

Figure 14

8

29 In Young’s double-slit experiment which uses a monochromatic light, the distance between the

screen and the double slits is 1.2 m. The separation between the slits is 0.3 mm. The distance between two successive dark fringes is 2.5 mm. What is the wavelength of the light?

A 5.6 × 10-7 m

B 6.3 × 10-7 m

C 9.4 × 10-7 m

D 14.1 × 10-7 m

30 Which of the following statements about electromagnetic waves is not true?

A All electromagnetic waves travel through vacuum with the same speed.

B All electromagnetic waves can be deflected by magnetic field. C All electromagnetic waves are transverse waves.

D All electromagnetic waves can be diffracted.

31 Which row shows parts of the electromagnetic spectrum in order of increasing wavelength? A Gamma → ultraviolet → infrared → radio wave

B infrared → radio wave → ultraviolet → Gamma

C radio wave → infrared → ultraviolet → Gamma D Gamma → infrared → ultraviolet → radio wave

32 In which of the following circuits, a 12 V, 36 W bulb will glow at normal brightness?

A B C D

33 Figure 15 shows a dry cell connected to two identical resistors, X and Y, of 6 Ω.

The emf of the dry cell is 12 V and internal resistance is 3 Ω. What is the current through Y?

A 0.6 A B 1.0 A C 2.0 A D 4.0 A

34 An electric motor operating at 250 V and 4 A is used to lift a load of 20 kg by a vertical

distance of 4 m in 1 s. What is the efficiency of the motor?

A 40% B 50% C 80% D 100%

Figure 15

9

35

Figure 16 shows four identical light bulbs, L1, L2, L3 and L4 are connected to a battery. Which

two bulbs are of the same brightness?

A L1 and L2 B L1 and L4 C L2 and L3 D L2, L3 and L4

36 Figure 17 shows a current flowing in a wire hanging between the poles of magnet. In which direction, A, B, C or D will the wire move?

37 Figure 18 shows a transformer with its primary coil connected to an alternating voltage supply.

The secondary coil is connected across a variable resistor.

Which of these changes will reduce the secondary voltage? A Increasing the current in the primary coil.

B Increasing the resistance of the variable resistor.

C Increasing the number of turns of the primary coil. D Increasing the cross-sectional area of the secondary coil.

38 Figure 19 shows a setup of apparatus to make a relay.

Which metal should be used to make the core? A Soft iron B Aluminium C Steel D Copper

Figure 16

Figure 18

Figure 19

Spring

Contact Core

Figure 17

10

39 Which of the diagrams below shows the correct poles for the electromagnet?

A

B

C

D

40 Which of the following statements about cathode ray is not true? A It is negatively charged.

B It possesses kinetic energy.

C It gives out light when it hits on glass. D It can be deflected by an electric field as well as a magnetic field.

41 Figure 20(a) shows the combination of three logic gates.

The truth table for the combination of the three logic gates is as shown in Figure 20(b).

What is gate P?

A AND B OR C NAND D NOR

42 When a transistor is used in an amplifier circuit,

A the base-emitter junction is reversed biased.

B the emitter current is smaller than the collector current. C the collector current is much more than the base current.

D there is a small current flowing in the collector even though the base current is zero.

43

Figure 21 shows a transistor circuit used as an automatic switch. Which statement about the

circuit is correct?

A The LDR has high resistance in bright light. B The lamp will go on in the light and go out in the dark.

C If R1 and LDR are swapped, the lamp will go on in the light.

D The potential difference across the base and the emitter increases in the light.

Figure 20 (a) (b)

Figure 21

11

44 Figure 22 shows a piece of silicon which is doped with foreign element.

Which of the following statement is true about the semiconductor shown above?

A It is a p-type semiconductor.

B The atom is a receiver atom.

C The majority charge carriers are free electrons. D The resistance of the semiconductor is lower than conductor.

45

Figure 23 shows the radioactivity for a radioactive substance (corrected for background

emission). What is the half-life of the radioactive substance?

A 1 hour B 2 hours C 3 hours D 5 hours

46 A radioactive nucleus is represented by232

90 X . It emits alpha and beta particles according to the

decay series below. 2 3 3232

90 X P Q R S T

Which of the following represents the composition of nucleus T?

No. of protons No. of neutrons

A 78 130

B 78 134

C 82 126

D 82 130

Figure 22

Figure 23

12

47

Figure 24 shows radioactive rays passing through an electric field. Identify X, Y and Z.

X Y Z

A β γ α

B γ β α C α β γ

D α γ β

48 The mass of an isotope is 480 g and its half-life is half a day. What is the mass of the isotope

remaining after 48 hours?

A 10 g B 30 g C 60 g D 120 g

49 In a nuclear reactor, graphite is placed around the uranium rods to

A Carry the heat energy released. B Protect the reactor from any radioactive radiation.

C Prevent the reactor from reaching critical condition.

D Slow down the neutrons involved in the chain reaction.

50 The process of combining two lighter nuclei to form a heavier nucleus is known as

A nuclear fusion.

B nuclear fission.

C radioactive decay.

D chain reaction.

Figure 24

Prepared by:

P.Y. Chan

Approved by:

Checked by: