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NATIONAL JUNIOR COLLEGEPROMOTIONAL EXAMINATIONSHigher 2

CANDIDATENAME

SUBJECTCLASS

REGISTRATIONNUMBER

PHYSICSPaper 1 Multiple Choice

Additional Materials: Multiple Choice Answer Sheet

9646/01TUE 6 October 2009

40 minutes

READ THE INSTRUCTION FIRST

Write in soft pencil.Do not use staples, paper clips, highlighters, glue or correction fluid.Write your name and registration number on the Answer Sheet in the spaces provided.

There are twenty questions on 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 separate

Answer Sheet.

Read the instructions on the Answer Sheet very carefully.

Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet.

This paper consists of 12 printed pages including this cover page.

Page 1 of 12

This document consists of 14 printed pages.

Promotional Exam

For IP students: Eg: Registration number: 07IP0408, the OAS should be shaded as 7408.

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Data

speed of light in free space, c = 3.00 x 10 8 ms -1

permeability of free space, 0 = 4 x 10 -7 Hm -1

permittivity of free space, 0 = 8.85 x 10 -12 Fm -1

elementary charge, e = 1.60 x 10 -19 C

the Planck constant, h = 6.63 x 10 -34 Js

unified atomic mass constant, u = 1.66 x 10 -27 kg

rest mass of electron, m e = 9.11 x 10 -31 kg

rest mass of proton, m p = 1.67 x 10 -27 kg

molar gas constant, R = 8.31 JK -1mol -1

the Avogadro constant, N A = 6.02 x 10 23 mol -1

the Boltzmann constant, k = 1.38 x 10 -23 JK -1

gravitational constant, G = 6.67 x 10 -11 Nm 2kg -2

acceleration of free fall, g = 9.81 ms -2

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Formulae

uniformly accelerated motion,2

21

at ut s +=

asuv 222 +=

work done on/by a gas, W = p V

hydrostatic pressure p = gh

gravitational potential,r

Gm=

displacement of particle in s.h.m., x = x 0 sin t

velocity of particle in s.h.m., t vv cos0= 22

0 x xv =

resistors in series, R = R 1 + R 2 +

resistors in parallel, ...111

21

++= R R R

electric potential,r

QV

04 =

alternating current/voltage, x = x 0 sin t

Transmission coefficient

T = ex p(-2kd)

Where2

2 )(8

h

E U mk

=

radioactive decay, x = x 0 exp (- t)

decay constant,21

693.0t

=

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1. Four quantities P , Q , R and S are related by the equation P = Q RS . Which of the statements must be correct for the equation to be homogeneous?

A P , Q , R and S all have the same units.B P , Q , R and S are all scalar quantities.C The product RS has the same units as P and Q .D The product RS is numerically equal to ( Q P ).

2. A student attempts to measure the diameter of a steel ball by using a metre ruleto measure four similar balls in a row.

The student estimates the positions on the scale to be as follows. X = (1.0 0.2 ) cmY = (5.0 0.2 ) cm

Which of the following gives the diameter of a steel ball with its associateduncertainty?

A (1.00 0.05 ) cm B (1.0 0.1 ) cmC (1.0 0.2 ) cm D (1.0 0.4 ) cm

3. When several forces act on a body, they will definitely cause

A the body to change its momentum such that the vector change inmomentum is in the direction of the resultant force.

B the body to change its momentum such that the vector sum of themomentum is in the direction of the resultant force.

C the body to change the direction of its momentum to the direction of theresultant force.

D the bodys momentum to still remain constant, due to principle of

conservation of linear momentum.

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metre rule

(not to scale) X Y

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4. The velocity - time ( v t ) graph of a particle is shown in Fig. 4 .

Fig. 4

Which of the following pairs of graphs best represents the displacement - time ( x - t )and acceleration - time ( a - t ) graphs for the particle?

A x

t

t

a

B x

t

a

t

C x

t

t

a

D x

t

a

t

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1 20

1 20

1 20

1 20

1 20

1 20

1 20

1 20

1 20

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5. A rescue plane is flying horizontally with a speed of 30 ms -1 and at an altitude of 125 m above the sea when it drops a warning flare. Neglecting air resistance andassuming that the plane does not change its course, speed or altitude, how far from the plane is the flare when it hits the water?

A 125 m B 146 mC 150 m D 195 m

6. Which one of following pairs of forces is a valid example of action and reaction towhich Newtons Third Law of Motion is applied?

A The weight of a man floating in water and the upthrust acting on the manby the water.

B The weight of a book resting on a table and the normal contact forceexerted on the book by the table.

C The centripetal force keeping a satellite in orbit round the earth and theweight of the satellite.

D The gravitational force on a man parachuting at constant speed towardsthe earth and the gravitational force on earth due to the man.

7.

The diagram shows part of the route of a roller-coaster in an amusement park. The cartdescends from H, completes a circular loop A and moves to B. If the cart is to completethe central circular track safely, what is the minimum speed of the cart at the bottom of the circular track A? Assume that there is no friction between the cart and the track andno air resistance.

A 9.81 m s -1 B 19.6 m s -1 C 22.1 m s -1 D 24.5 m s -1

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H

A

B

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8. A student, holding a ball, is standing on a trolley moving at constant speed v towards the right on a frictionless surface. He conducts the following experimentsseparately:

(i) He throws the ball to the left and the final speed of the trolley is v A.(ii) He throws the ball to the right and the final speed of the trolley is v B.(iii) He drops the ball from rest and the final speed of the trolley is v C.

Assuming negligible air resistance, which of the following best describes therelationship between the velocities?

A v A = v B = v C = v B v A > v B > v > v CC v A > v C > v B , v A = v D v A > v C > v B , v C = v

9. A fly of weight Q is submerged in a stationary position in a sealed beaker filled tothe brim. This beaker is resting on the balance as shown below. The weight of the sealed beaker when it is completely filled with water without the fly is P .

What is the reading of the balance?

A P B Q C P + Q D P Q

10. A car of mass 800 kg accelerates uniformly from rest to 25.0 ms -1 in 10.0 s. Themean power developed over the 10.0 s interval is

A 0.80 kW B 12.5 kW C 25.0 kW D 50.0 kW

11. The specific latent heat of vaporisation of water at 20 oC is appreciably greater than the value at 100 oC. This is because

A the specific latent heat at 20 oC includes the energy necessary to raise thetemperature of one kilogram of water from 20 oC to 100 oC.

B more work must be done in expanding the water vapour againstatmospheric pressure at 20 oC than at 100 oC.

C the molecules in the liquid are more tightly bound to one another at 20 oCthan at 100 oC.

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D vaporisation of water can only take place at 100 oC.12. Given 1 mole of a monatomic ideal gas in a state characterized by P A, V A, a

change occurs so that the final pressure and volume are equal to P B, V B, whereV B > V A. Which of the following statements is true?

A The heat supplied to the gas during the process is completely determinedby the values P A, V A, P B and V B.

B The change in the internal energy of the gas during the process iscompletely determined by the values P A, V A, P B and V B.

C The work done by the gas during the process is completely determined bythe values P A, V A, P B and V B.

D None of the above.

13. A fixed mass of an ideal gas undergoes the changes as indicated in Fig. 13 by

ABCA below. One of the processes is adiabatic and another is isothermal.

Which of the following is true?

A AB is adiabatic compression.B AB is isothermal compression.C There is an increase in internal energy of the gas when it undergoes the

process ABCA.D There is positive net work done on the gas for the process ABCA.

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B

A C

pressure

Volume0

Fig. 13

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14. The graph of displacement against time for a particle executing simple harmonicmotion is shown below. Which of the lower diagrams shows the corresponding graphof kinetic energy against time for the particle?

A

B

C

D

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displacement

time

kinetic energy

time

kinetic energy

time

kinetic energy

time

kinetic energy

time

0

0

0

0

0

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15. John is watching, in Singapore, a live telecast of the American Idol from arecording studio in USA where the ground station transmits a microwave signalto Johns television antenna via a satellite. The total distance of the transmissionpath is 20 000 km.

John is seated 2.00 m from his television set while the audience is 10.0 m fromthe American Idol contestant. Assume that the live audience hears the sounddirectly from the contestant and the speed of sound is 330 ms -1. When thecontestant sings into the microphone, calculate the time difference between Johnhearing the contestant and the live audience hearing the contestant.

A 0.0727 sB 0.0424 sC 0.0303 sD 0.0242 s

16. A boy blows gently across the top of a piece of glass tubing, the lower end of which is closed by his finger so that the tube gives its fundamental note of frequency, f . While blowing, he removes his finger from the lower end. The notehe then hears will have a frequency of approximately

A f /4B f /2C f D 2f

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17.

Fig. 17

Fig. 17 represents a Youngs double slits arrangement, in which a is the width of the primary slit S, b its distance from the secondary slits S 1 and S 2, f theseparation of the secondary slits, g the separation between the secondary slitsand the screen, and x the separation of the bright bands on the screen. If isthe wavelength of the monochromatic light used, then the separation x is

A f / g B g / f C b / g D b / a

18. Light of wavelength is incident normally on a diffraction grating of slit separation4 . What is the angle between the second-order maximum and third-order maximum?

A 14.5 B 18.6 C 48.6 D 71.4

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Screen

a

bg

f S

S1

S2

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19. The resistors P, Q and R in the circuit have equal resistance.

The battery, of negligible internal resistance, supplies a total power of 12 W. What isthe power dissipated in resistor R?

A 2.0 W B 3.0 W C 4.0 W D 6.0 W

20. A potentiometer has a wire XY of length l and resistance R . A battery, of e.m.f. E and internal resistance r , is connected in series with an external resistor of resistance r .

With a cell of e.m.f. E 1 in the branch circuit, the null point is found to be3l

from X, as

shown below.

What is the value of E 1 in terms of E , R and r ?

A3

E

B)(3 r R

ER+

C )2(3 r R Er +

D)2(3 r R

ER+

End of Paper 1

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E r

P

Q

R

E 1