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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level

9702/12

May/June 2010

1 hour

Multiple Choice Answer Sheet

Soft clean eraser

Soft pencil (type B or HB is recommended) PHYSICS Paper 1 Multiple Choice Additional Materials: *6110680828*

READ THESE INSTRUCTIONS FIRST

Write in soft pencil.

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

Write your name, Centre number and candidate number on the Answer Sheet in

the spaces provided unless this has been done for you.

There are forty 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 working should be done in this booklet.

This document consists of 24 printed pages.

IB10 06_9702_12/RP

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Data

speed of light in free space,

permeability of free space,

permittivity of free space,

elementary charge,

the Planck constant,

unified atomic mass constant,

rest mass of electron,

rest mass of proton,

molar gas constant,

the Avogadro constant,

the Boltzmann constant,

gravitational constant,

acceleration of free fall,

c = 3.00 × 108 m s–1 μ0 = 4π × 10–7 H m–1 ε0 = 8.85 × 10–12 F m–1 e = 1.60 × 10–19 C h = 6.63 × 10–34 J s u = 1.66 × 10–27 kg me = 9.11 × 10–31 kg mp = 1.67 × 10–27 kg R = 8.31 J K–1 mol–1 NA = 6.02 × 1023 mol–1 k = 1.38 × 10–23 J K–1 G = 6.67 × 10–11 N m2 kg–2 g = 9.81 m s–2

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Formulae

uniformly accelerated motion, s = ut + at2 v2 = u2 + 2as work done on/by a gas, W = p?V gravitational potential, φ = – hydrostatic pressure, p = ρgh pressure of an ideal gas, p = <c 2> simple harmonic motion, a = – ω 2x velocity of particle in s.h.m., v = v0 cos ωt v = ± ω x02?x2 electric potential, V =

0capacitors in series, 1 / C = 1 / C1 + 1 / C2 + . . . capacitors in parallel, C = C1 + C2 + . . . energy of charged capacitor, W = QV resistors in series, R = R1 + R2 + . . . resistors in parallel, 1 / R = 1 / R1 + 1 / R2 + . . . alternating current/voltage, x = x0 sin ωt radioactive decay, x = x0 exp(–λt) decay constant, λ =

2

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1

A micrometer screw gauge is used to measure the diameter of a copper wire. The reading with the wire in position is shown in diagram 1. The wire is removed and the jaws of the micrometer are closed. The new reading is shown in diagram 2.

15

10

050201510

diagram 1

What is the diameter of the wire?

A 1.90 mm

2 B 2.45 mm C 2.59 mm diagram 2 D 2.73 mm The SI unit for potential difference (the volt) is given, in base units, by

A kg m A–1 s–3.

B m2 A–1 s–2.

C kg m2 s–2.

Space for working

D kg m2 A–1 s–3.

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3

mass of empty beaker = (20 ± 1) g

mass of beaker + liquid = (70 ± 1) g

volume of liquid

What is the uncertainty in this value?

A 0.3 g cm–3

4

What is represented by the area under the graph between two times?

A the change in kinetic energy of the ion

B the average force on the ion

C the change in momentum of the ion

D the change in velocity of the ion

Space for working

B 0.5 g cm–3 C 0.6 g cm–3 D 2.6 g cm–3 = (10.0 ± 0.6) cm3 A student finds the density of a liquid by measuring its mass and its volume. The following is a summary of his measurements. He correctly calculates the density of the liquid as 5.0 g cm–3. An ion is accelerated by a series of electrodes in a vacuum. A graph of the power supplied to the ion is plotted against time.

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5

The diagram shows a square-wave trace on the screen of a cathode-ray oscilloscope. A grid of 1 cm squares covers the screen. The time-base setting is 10 ms cm–1.

1 cm

What is the approximate frequency of the square wave?

A 70 Hz

Space for working

B 140 Hz C 280 Hz D 1400 Hz

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6 A vector quantity V is resolved into two perpendicular components X and Y. The angle between V

and component X is θ.

The angle between component X and the vector V is increased from 0° to 90°.

How do the magnitudes of X and Y change as the angle θ is increased in this way?

A B C D

7 The product of pressure and volume has the same SI base units as

A energy.

B force.

C area.

D force

length.

Space for working

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hA small steel ball falls freely under gravity after being released from rest. Which graph best represents the variation of the height h of the ball with time t ?

9

tttt The diagram shows a velocity-time graph for a vehicle.

velocity/ m s–1

time / s

The vehicle, moving at 4.0 m s–1, begins to accelerate at time = 0.

What is the vehicle’s acceleration at time = 3.0 s?

A 0.67 m s–2 B 1.0 m s–2 C 1.3 m s–2 D 2.0 m s–2

Space for working

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10 The diagram shows two identical spheres X and Y.

XY

What happens?

Initially, X moves with speed v directly towards Y. Y is stationary. The spheres collide elastically.

11 Two equal masses travel towards each other on a frictionless air track at speeds of 60 cm s–1 and

40 cm s–1. They stick together on impact.

60 cm s–140 cm s–1

What is the speed of the masses after impact?

A 10 cm s–1

Space for working

B 20 cm s–1 C 40 cm s–1 D 50 cm s–1 ? UCLES 2010

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12 Forces of 3 N, 4 N and 5 N act at one point on an object. The angles at which the forces act can

vary.

What is the value of the minimum resultant force of these forces?

A 0

B between 0 and 2 N

C 2 N

D between 2 N and 4 N

13 An object, immersed in a liquid in a tank, experiences an upthrust.

What is the physical reason for this upthrust?

A The density of the body differs from that of the liquid.

B The density of the liquid increases with depth.

C The pressure in the liquid increases with depth.

D The value of g in the liquid increases with depth.

Space for working

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14 A brick weighing 20 N rests on an inclined plane. The weight of the brick has a component of 10 N

parallel with the plane. The brick also experiences a frictional force of 4 N.

What is the acceleration of the brick down the plane? Assume that the acceleration of free fall g is equal to 10 m s–2.

A 0.3 m s–2 B 0.8 m s–2 C 3.0 m s–2 D 8.0 m s–2

15 A constant force F, acting on a car of mass m, moves the car up the slope through a distance s at

constant velocity v. The angle of the slope to the horizontal is α.

Which expression gives the efficiency of the process?

A mgs sin α B 2mg sinα Fs2Fs

Space for working

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16 A force of 1000 N is needed to lift the hook of a crane at a steady velocity. The crane is then used

to lift a load of mass 1000 kg at a velocity of 0.50 m s–1.

How much of the power developed by the motor of the crane is used in lifting the hook and the load? Assume that the acceleration of free fall g is equal to 10 m s–2.

A 5.0 kW B 5.5 kW C 20 kW D 22 kW

17 When ice melts, it contracts.

Which row is correct for ice turning into water?

A

B

C

D distance between atoms density

Space for working

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18 Atmospheric pressure at sea level has a value of 100 kPa.

The density of sea water is 1020 kg m–3.

At what depth in the sea would the total pressure be 110 kPa?

A 1.0m B 9.8 m C 10 m D 11 m

19 A spring is compressed by a force. The graph shows the compressing force F plotted against the

length L of the spring.

F / NL / mm

What is the spring constant of this spring?

A 0.2 N m–1 B 5 N m–1 C 100 N m–1 D 200 N m–1

Space for working

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20 Which graph represents the force-extension relationship of a rubber band that is stretched almost

to its breaking point?

forceforce

Space for working extensionextension

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21 In stress-strain experiments on metal wires, the stress axis is often marked in units of 108 Pa and the strain axis is marked as a percentage. This is shown for a particular wire in the diagram.

38stress / 10 Pa

2

1

012345

strain / %

A 6.0 × 107 Pa B 7.5 × 108 Pa C 1.5 × 109 Pa What is the value of the Young modulus for the material of the wire?

22 The diagram shows a steel wire clamped at one end and tensioned at the other by a weight hung

D 6.0 × 109 Pa

weight

generator

Which frequency should be used to produce a stationary wave with two loops?

A A vibration generator is attached to the wire near the clamped end. A stationary wave with one loop is produced. The frequency of the vibration generator is f.

Space for working

4B C 2 f 2D 4 f

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23 Diagram 1 shows a ripple tank experiment in which plane waves are diffracted through a narrow

slit in a metal sheet.

Diagram 2 shows the same tank with a slit of greater width.

In each case, the pattern of the waves incident on the slit and the emergent pattern are shown.

vibrating

barvibratingbar

diagram 1diagram 2

Which action would cause the waves in diagram 1 to be diffracted less and so produce an emergent pattern closer to that shown in diagram 2?

A increasing the frequency of vibration of the bar

B increasing the speed of the waves by making the water in the tank deeper

C reducing the amplitude of vibration of the bar

D reducing the length of the vibrating bar

24 Electromagnetic waves from an unknown source in space were found to be significantly diffracted

when passing through gaps of the order of 10–5 m.

Which type of wave are they most likely to be?

A radio waves

B microwaves

C infra-red waves

D ultraviolet waves

Space for working

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25 Using monochromatic light, interference fringes are produced on a screen placed a distance D

from a pair of slits of separation a. The separation of the fringes is x.

Both a and D are now doubled.

What is the new fringe separation?

A B x C 2x D 4x

26 Two oppositely-charged parallel plates are arranged as shown.

An electron is released from rest from the surface of the negatively-charged plate.

The electron travels from the negatively-charged plate towards the positively-charged plate.

Which graph shows how the force F on the electron varies with its distance x from the negative plate?

F

Space for working

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27 In the diagram, the shaded area represents a uniform electric field directed away from the

observer (at right-angles into the plane of the paper).

In which direction is this beam deflected by the field?

A upwards (in the plane of the paper)

B downwards (in the plane of the paper)

C away from the observer

D towards the observer

Space for working A horizontal beam of electrons enters the field, travelling from left to right.

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28 The diagram shows two points P and Q which lie, 90° apart, on a circle of radius r.

A positive point charge at the centre of the circle creates an electric field of magnitude E at both P and Q.

Which expression gives the work done in moving a unit positive charge from P to Q?

A 0 B E × r C E × ???

?2?? D E × (πr )

Space for working

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29 Which row describes the circumstances under which forces act on a charged particle in a uniform

electric field?

A

B

C

D charged particle moving charges only stationary charges only stationary and moving charges stationary and moving charges direction of force parallel to the field perpendicular to the field parallel to the field perpendicular to the field

30 The resistance of a thermistor depends on its temperature, and the resistance of a

light-dependent resistor (LDR) depends on the illumination.

Under which conditions will the resistance of both a thermistor and an LDR be highest?

A

B

C

D highest temperature highest temperature lowest temperature lowest temperature highest illumination lowest illumination highest illumination lowest illumination

31 In terms of energy transfer W and charge q, what are the definitions of potential difference (p.d.)

and electromotive force (e.m.f.)?

Space for working

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32 In each arrangement of resistors, the ammeter has a resistance of 2 ?.

Which arrangement gives the largest reading on the ammeter when the same potential difference

is applied between points P and Q?

BA

2 ?

33 A source of e.m.f. of 9.0 mV has an internal resistance of 6.0 ?.

It is connected across a galvanometer of resistance 30 ?.

What will be the current in the galvanometer?

A 250 μA B 300 μA C 1.5 mA D 2.5 mA

Space for working

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

R

What is the power dissipated by heating in resistor R?

A 2 W B 3 W C 4 W The battery, of negligible internal resistance, supplies a total power of 12 W. D 6 W

35 In deriving a formula for the combined resistance of three different resistors in series, Kirchhoff’s

laws are used.

Which physics principle is involved in this derivation?

A the conservation of charge

B the direction of the flow of charge is from negative to positive

C the potential difference across each resistor is the same

D the current varies in each resistor, in proportion to the resistor value

Space for working

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36 What is the unit of resistivity?

A ? m–2 B ? m–1 C ? D ? m

37 The grid shows a number of nuclides arranged according to the number of protons and the

number of neutrons in each.

A nucleus of the nuclide 83Li decays by emitting a β-particle.

What is the resulting nuclide?

number ofprotons4AB

363Li73Li83Li

232He42HeCD

111H21H

0123456

number of neutrons

Space for working

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38 The following represents a sequence of radioactive decays involving two α-particles and one

β-particle. 217At85

What is the nuclide X?

A 21385At B 21577Ir C 20982Pb D 21781Tl

39 What are the correct descriptions of a γ-ray and a β-particle?

γ-ray β-particle

A

B

C

D high-speed electron electromagnetic radiation electromagnetic radiation high-speed electron electromagnetic radiation helium-4 nucleus high-speed electron helium-4 nucleus

40 What is not conserved in nuclear processes?

A charge

B momentum

C the total number of neutrons

D the total number of nucleons

Space for working

Permission to reproduce items where third-party owned material protected by copyright is included has been sought and cleared where possible. Every reasonable effort has been made by the publisher (UCLES) to trace copyright holders, but if any items requiring clearance have unwittingly been included, the publisher will be pleased to make amends at the earliest possible opportunity. University of Cambridge International Examinations is part of the Cambridge Assessment Group. Cambridge Assessment is the brand name of University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge.

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