CE Phy Mock Paper D2

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Kwok Tak Seng Catholic Secondary SchoolS.5 Mock Examination 2004-05

PHYSICS PAPER II7 - 3 -2005

Time allowed : 1 hour

Total no. of pages : 14This paper must be answered in English

1. Read carefully the instructions on the Answer Sheet and insert the information required in the spacesprovided.

2. When told to open this paper, check that all the questions are there. Look for the words END OF PAPERafter the last question.

3. All questions carry equal marks.

4. ANSWER ALL QUESTIONS. You should mark all your answers on the Answer Sheet.

5. You shourld mark only ONE answer to each question. If you mark more than one answer, you will receiveNO MARKS for that question.

5. No marks will be deducted for wrong answers.

6. There is a list of physics formulae which you may find useful.

Useful Formulae in Physics

(a) Relationships between initial velocity u, uniform acceleration a, finalvelocity v and displacement travelled s after time t:

v = u + at

s = ut +1

2at

2

v2

= u2

+ 2 as

(b) Potential energy gained by a body of mass m when raised through a

height h is mgh.

(c) Kinetic energy of a body of mass m moving with speed v

is1

2mv

2

(d) Power = force velocity

(e) Equivalent resistance of two resistorsR1 andR2 :

(i) in series =R1 + R2

(ii) in parallel =R R

R R

1 2

1 2+

(f) Power = potential difference current


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There are 45 questions.

If necessary, take g= 10 m s-2.

Unless otherwise specified, all the cells are assumed to have negligible internal resistance.

1. Consider three heat sinks made of the following materials. If their designs are the same, whichone has the best performance?

Material Specific heat capacity Density

Aluminium 900 J kg-1 C-1 2700 kg m-3

Glass 600 J kg-1C-1 2400 kg m-3

Copper 370 J kg-1 C-1 8900 kg m-3

A Aluminium, because it has the highest specific heat capacity.B Copper, because it has the lowest specific heat capacity.C Glass, because the heat sink is the lightest.D Copper, because the heat sink has the highest heat capacity.

2. The following figure shows the structure of a thermos flask.

Which of the components of the thermos flask is best at:preventing heat loss byconduction

preventing heat loss byconvection

preventing heat loss byradiation

A vacuum between thedouble glass walls

silvery glass walls plastic stopper

B vacuum between the

double glass walls

plastic stopper insulated support

C plastic stopper insulated support silvery glass wallsD insulated support vacuum between the

double glass wallssilvery glass walls

3. Which of the following descriptions about evaporation of water is/are correct?(1) The average kinetic energy of water decreases during evaporation.(2) Evaporation takes place only when the water temperature is greater than the room

temperature.(3) Water absorbs energy when it boils as well as it evaporates.

A (1) and (2) onlyB (1) and (3) onlyC (2) and (3) only

D (1), (2) and (3)

insulated support

silvery glass wall

vacuum flask (the vacuum is

between the double glass walls)

plastic stopper


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4. The diagram below shows the apparatus used for finding the specific latent heat of vaporizationof water.

Which of the following factors will cause the result obtained to be smaller than the true value?(1) Some energy supplied by the heater is lost to the surroundings.(2) Some water splashes out of the cup as it boils.(3) Some steam condenses and drips back into the polystyrene cup.

A (1) only

B (2) onlyC (1) and (2) onlyD (2) and (3) only

5. In an experiment, a trolley with a card of width 5 cm passes through the light gate in 0.25 s.What is the following quantity?

s0.25

cm5 = 20 cm s1

A Instantaneous speed of the trolley passing the light gate.B Average speed of the trolley passing the light gate.C Instantaneous acceleration of the trolley passing the light gate.D Average acceleration of the trolley passing the light gate.

6. The following graph shows that quantityXis directly proportional to time t.

Which of the following can be the quantityX?(1) Velocity of a freely falling object with negligible air resistance.(2) Displacement of an object moving at constant velocity.(3) Distance travelled by an object moving with constant acceleration.

A (1) and (2) only.B (1) and (3) only.C (2) and (3) only.D (1), (2) and (3).

X

t/ s


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7. The following velocity-time graph records the motion of a trolley moving on a runway.

Which of the following statements about the motion of the trolley is/are true?(1) The trolley changes travelling direction at t= 2.6 s.(2) The speed of the trolley before t= 2.6 s is almost twice that aftert= 2.6 s.(3) The displacement of the trolley is zero.

A (2) only.B (1) and (2) only.C (1) and (3) only.D (1), (2) and (3).

8. (Refer to the last question.) In the following figure, Tommy stands at a cliff and throws a stonevertically upwards at 15 m s1. The stone rises to the highest point and then falls into the sea.

Which of the following graphs best represents the variation of the velocity v of the stone withtime tafter it leaves the hand of Tommy and before it reaches the sea? (Take upwards aspositive.)

A B

C D

v

t

v

t

v

t

v

t


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9. Which of the following is/are the direct implication(s) of Newton's first law?(1) A boy standing on a bus is 'pulled' backwards when the bus starts moving.(2) On a smooth surface, when you push another person in front of you, you will move

backwards.(3) The balls of different masses reach the ground at the same time in Galileo's experiment

(carried out on the tower of Pisa).

A (1) onlyB (2) onlyC (3) onlyD (1) and (2) only

10. Which of the following graphs show(s) that a constant resultant force is acting on the object?(1) (2)

(3)

A (1) and (2) onlyB (1) and (3) onlyC (2) and (3) onlyD (1), (2) and (3)

11. In the figure below, a block of massx kg is suspended by a string and a horizontal force.

If the tension in the string is T, which of the following statements is INCORRECT?A Tsin =FB In order to keep the block stationary, when increases,Fshould increase.C Tcos =xD F= 10x tan

T

F

xkg

s

t

v

t

a

t


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12. Mary of weight Wstands inside a lift. The life is moving upwards at a constant acceleration. Letthe normal force exerted on Mary by the floor beR, which of the following statements is/arecorrect?(1) R is greater than Win magnitude.(2) R and Ware in opposite directions.(3) R and Wform an action-and-reaction pair according to Newton's third law.

A (1) onlyB (2) onlyC (1) and (2) onlyD (2) and (3) only

13. A ball is pushed up an inclined plane by a force of 10 N to a height of 5 m from the ground.

Which of the following statements is/are correct?(1) Work done by the force is 50 J.(2) The potential energy gained by the ball is 50 J.(3) If the force makes an angle with the surface of the inclined plane, the work done by the

force would be greater.A (2) only.B (1) and (2) only.C (1) and (3) only.

D (1), (2) and (3).

14. CN Tower in Canada is 533 m tall and it is the tallest building in the World. If a stone of 200 g isthrown vertically upwards at 5 m s1 at the top of the CN Tower, what is the kinetic energy of thestone when it drops to the ground? Neglect air resistance.

A 2.5 JB 535 JC 1070 JD 2140 J

15. A ball falls from a height ofh to the ground and bounces back to the same height. Which of thefollowing statements is/are correct?(1) The momentum of the ball just before collision and that just after collision are the same.(2) The speed of the ball just before collision and that just after collision are the same.(3) The net force acting on the ball during the downward journey and that during the upward

journey are same.A (1) and (2) onlyB (1) and (3) onlyC (2) and (3) onlyD (1), (2) and (3)

5 m

30

10 N

1 kg


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16. A string of waves is coming to particleA from the left.

How will particleA move?A

moves along the wave

B

moves along the wave

C

moves along a vertical line

D

moves along a vertical line

17. In the following figure, two loudspeakersXand Yare connected to a signal generator, and amicrophone is connected to a CRO.

When the microphone moves fromPto Q, wherePlies on the centre line betweenXand Y, thereading of the CRO varies as shown in the following figure.Which of the following figures best shows the display of CRO when the frequency is doubled?

A

travelling direction

A

A

A

A


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18. You can see the signature on the passbook because of the rayX. What isX?

A Infra-redB Visible lightC Ultra-violetD X-ray

19. In the following figure, a girl 150 cm tall stands facing a 75 cm long mirror, the bottom edge ofwhich is 30 cm above the floor.

If the girl's eyes are 10 cm below the top of her head, which of the following statements isWRONG?

A The girl cannot see her whole image no matter how far she is from the mirror.B The girl cannot see her whole image no matter how high she hangs the mirror.C The distance between the girl and the mirror is the same as the distance between

the girl's image and the mirror.D The girl's image can be photographed.

20. What is/are the advantage(s) of right-angled prisms over plane mirrors in periscopes?(1) The image is erect.(2) Multiple images are not formed.(3) The image is of the same size as the object.

A (2) onlyB (1) and (2) onlyC (2) and (3) onlyD (1), (2) and (3)

21. A light ray travels from medium I to medium IV, as shown in the following figure. Arrange therefractive indices of the media in ascending order.

A IV < II < I < IIIB III < IV < II < IC IV < II < III < ID III < I < IV < II

X

passbook


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25. The following figure shows electric field lines coming from three point chargesX, YandZ.

What are the charges ofX, YandZ?X Y Z

A. negative negative negativeB. negative positive positiveC. positive negative negativeD. positive negative positive

26. What would happen when keyKis closed?

(1) The voltmeter reading increases.(2) The ammeter reading increases.(3) BulbNbecomes brighter.

A (1) and (2) onlyB (1) and (3) onlyC (2) and (3) onlyD (1), (2) and (3)

27. A lamp is switched on and it draws a current ofIamperes fortminutes. How much charge haspassed through the lamp?

A ItCB 60ItC

Ct

I

60C

DI

tC

28. In the following circuit, the resistance ofR2 is half of that ofR1. When S1 is closed, the ammeterreads 1.6 A.What is the reading of the ammeter when both S1 and S2 are closed?

A 0. 6 AB 2.8 AC 3.6 AD 4.2 A

A

V

M N

K

A

3 V

5

R1

R2

S1

S2


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29. In the following figure, all lamps are identical.What is the ratio of the power ofXto that ofY?

A 1 : 1B 3 : 1C 1 : 7D 9 : 1

30. In the following figure, the electric iron is not properly connected.

Which of the following arrangements is/are required?(1) The fuse should be connected to wireZinstead of wireX.(2) The switch Sshould be connected to wireXinstead of wireZ.(3) The wire Yshould not be connected to the metal case.

A (1) onlyB (2) onlyC (1) and (3) onlyD (2) and (3) only

31. The following figure shows a current flowing along a wire, from Xto Y.

Which of the following figures best represents the magnetic field produced?A B

C D

32. The following figure shows an electric bell.Which of the following methods can increase the loudness of the hitting sound?(1) Push the bell-push faster and harder.(2) Use a larger soft-iron core.(3) Connect more cells in series with the battery.

A (3) onlyB (1) and (2) onlyC (1) and (3) onlyD (2) and (3) only

XY

X Y

X Y X Y

X

Y

bell-push

soft-iron core

X

Y


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33. In the following figure, a magnet is moving towards a coil at uniform speed.

Which of the following graphs best represents the reading of the voltmeter when the magnetmoves fromXto Y?

A B

C D

34. In the following figure, a simple magnetic tape playback system is reading the magnetic patternon a tape.At which of the following positions is the magnitude of the galvanometer reading greatest?

A PB QC RD S

tovoltmeter

X

Y

+

SN

movementof the tape

PQRS


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35. In the following figure, a simple generator rotates clockwise to the observer.

Which of the following statements about the generator is/are correct?(1) It is an a.c. generator.(2) The current produced passes through the lamp fromXto Y.(3) The brightness of the lamp increases with the rotation speed of the coil.

A (1) only

B (3) onlyC (1) and (2) onlyD (2) and (3) only

36. The figure below shows two different power transmission systems,Xand Y.

If the total resistance of the transmission cables in both systems are 10 , what is the ratio of thepower loss in transmitting power in systemXto that in system Y? Assume no power loss intransformers.

A 10 : 1B 15 : 1C 20 : 1D 25 : 1

37. In the following figure, the readings of a GM counter are significant only atXand Y.

Which of the following methods can significantly reduce the reading of the GM counter atX?(1) Cover the source with 5 mm of aluminum.(2) Apply a magnetic field pointing into the paper.(3) Reverse the electric potential across the plates.A (2) onlyB (3) onlyC (1) and (2) onlyD (1), (2) and (3)

systemX

system Y

heater

heater


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38. Radiation workers are required to wear a film badge. What is the function of the film badge?A Monitoring the radiation the workers expose toB Showing people that they are radiation workersC Shielding workers from radiationD Warning people of high radioactive regions

39. A nucleus X232

90is decayed to Y

228

89. What is/are probably emitted in the process?

A One particle and one particleB One particle and rayC Four particlesD Four particles

40. The half-life of a radioactive source is 3 days. If the initial mass of the source is 100 g, what isthe weight of the decayed nuclei after 12 days?

A 6.25 gB 25 gC 75 gD 93.75 g

41. Which of the following is NOT correct to both nuclear reactor and atomic bomb?A Nuclear fission occurs inside them.

B The mass of the nuclear materials inside them is larger than the critical mass.C Huge amount of heat is given out inside them.D The rate of nuclear reaction inside them is the same.

Directions : Each question below (Questions 42-45) consists of two statements. Decide whether each ofthe two statements is true or false. If both are true, then decide whether or not the secondstatement is a correct explanation of the first statement. Then select one option A - Eaccording to the following table :

1st statement 2nd statement

A. True True 2nd statement is a correct explanation of the1st statement

B. True True 2nd statement is a NOT correct explanation of the1st statement

C. True False ---D. False True ---

1st statement 2nd statement

42. The displacement of a freely fallingobject increases with time.

The acceleration of a freely fallingobject increases with time.

43. The velocity of an object is directlyproportional to the resultant force actingon the object.

An object in uniform motion must havezero resultant force.

44. The brightness of a bulb depends onlyon the voltage across it.

The larger the voltage across the bulb,the more the energy is given to the bulbby each coulomb of charge.

45. In an a.c. generator, increasing therotating speed of the coil can increasethe amplitude of the induced voltage.

The voltage induced in a conductorincreases with the speed at which theconductor cuts through the magneticfield lines.

END OF PAPER

CE Phy Mock Paper D2

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