Cambridge A Level Physics 9702 — 2015 Oct/Nov Paper 1 · Variant 3

Question 1

1 What is the unit of the Young modulus when expressed in SI base units? A kg m–1 s–2 B kg m3 s–2 C kg m–2 D kg m–1 s–1

Accepted Answer

A

Question 2

2 The Reynolds number R is a constant used in the study of liquids flowing through pipes. R is a pure number with no unit. ρvD R = µ where ρ is the density of the liquid, v is the speed of the liquid and D is the diameter of the pipe through which the liquid flows. What are the SI base units of µ? A kg m s B kg m–1 s C kg m s–1 D kg m–1 s–1

Accepted Answer

D

Question 3

3 When a force F moves its point of application through a displacement s in the direction of the force, the work W done by the force is given by W = F s. How many vector quantities and scalar quantities does this equation contain? A one scalar quantity and two vector quantities B one vector quantity and two scalar quantities C three scalar quantities D three vector quantities

Accepted Answer

A

Question 4

4 Measurements are subject to systematic error and random error. Which measurements have high accuracy and low precision? A high random error and high systematic error B high random error and low systematic error C low random error and high systematic error D low random error and low systematic error

Accepted Answer

B

Question 5

5 The density of the material of a coil of thin wire is to be found. Which set of instruments could be used to do this most accurately? A metre rule, protractor, spring balance B micrometer, metre rule, top-pan balance C stopwatch, newton-meter, vernier calipers D tape measure, vernier calipers, lever balance

Accepted Answer

B

Question 6

6 A cylindrical tube rolling down a slope of inclination θ moves a distance L in time T. The equation relating these quantities is  a2  L  3 + P  = QT 2 sin θ     where a is the internal radius of the tube and P and Q are constants. Which row gives the correct units for P and for Q? P Q A m2 m2 s–2 B m2 m s–2 C m2 m3 s–2 D m3 m s–2

Accepted Answer

B

Question 7

7 Variables x and y are related by the equation y = p – qx where p and q are constants. Values of x and y are measured experimentally. The results contain a systematic error. Which graph best represents these results? A B y y p p 00 00 x x C D y y p p 00 00 x x

Accepted Answer

A

Question 8

8 A cheetah and an antelope are 100 m apart. The cheetah spots the antelope and runs towards it. The antelope reacts to the cheetah after one second and runs directly away from the cheetah. Both animals take 2 seconds to reach their top speeds. The graph shows how the speeds of the two animals vary with time. 35 speed m s–1 30 cheetah 25 antelope 20 15 10 5 0 0 5 10 15 20 time / s How far apart are the animals, 17 seconds after the cheetah began running? A 4 m B 11 m C 54 m D 89 m

Accepted Answer

B

Question 9

9 A boy throws a stone with a horizontal velocity of 10 m s–1 from the top of a building. The height of the building is 8.0 m. The stone travels along a curved path until it hits the ground, as shown in the diagram. 10 m s–1 building 8.0 m ground How long does it take the stone to reach the ground? (Air resistance can be neglected.) A 0.61 s B 0.80 s C 1.3 s D 1.6 s

Accepted Answer

C

Question 10

10 A football is released above a plane, sloping surface and bounces several times. The diagram shows its path between its bounces at X and at Y. Assume that there is no air resistance. X Y Which graph correctly shows the variation with time t of the horizontal component of its velocity vh between X and Y? A B vh vh 0 0 0 0 t t C D vh vh 0 0 t 0 0 t

Accepted Answer

C

Question 11

11 A rocket of mass 30 000 kg sits on a launch pad on the Earth’s surface. The rocket motors provide an upward force of 330 kN on the rocket. What is the initial acceleration of the rocket? A 0.12 m s–2 B 1.1 m s–2 C 1.2 m s–2 D 11 m s–2

Accepted Answer

C

Question 12

12 Two equal masses X and Y are moving towards each other on a frictionless air track as shown. The masses make an elastic collision. air track 50 cm s–1 30 cm s–1 X Y Which row gives possible velocities for the two masses after the collision? velocity of X velocity of Y A zero 20 cm s–1 to the right B 10 cm s–1 to the right 10 cm s–1 to the right C 20 cm s–1 to the left zero D 30 cm s–1 to the left 50 cm s–1 to the right

Accepted Answer

D

Question 13

13 Which statement is correct with reference to perfectly elastic collisions between two bodies? A Neither total momentum nor total kinetic energy need be conserved but total energy must be conserved. B Total momentum and total energy are conserved but total kinetic energy may be changed into some other form of energy. C Total kinetic energy and total energy are both conserved but total momentum is conserved only if the two bodies have equal masses. D Total momentum, total kinetic energy and total energy are all conserved.

Accepted Answer

D

Question 14

14 Which statement best describes a couple? A a pair of forces of equal magnitude acting in opposite directions which produce rotational motion but not translational motion B a pair of forces of equal magnitude acting in opposite directions which produce translational motion but not rotational motion C a pair of forces of equal magnitude acting in the same direction which produce rotational motion but not translational motion D a pair of forces of equal magnitude acting in the same direction which produce translational motion but not rotational motion

Accepted Answer

A

Question 15

15 A cross-shaped structure, freely pivoted at O, has arms of lengths 5.0 m, 4.0 m, 3.0 m and 2.0 m. It is acted on by forces of 2.0 N, 3.0 N, 4.0 N and an unknown force F. The structure is in rotational equilibrium. F 5.0 m 2.0 N 2.0 m O 4.0 m 30° 3.0 N 3.0 m 4.0 N What is the magnitude of force F ? A 0.40 N B 2.0 N C 2.6 N D 4.4 N

Accepted Answer

B

Question 16

16 A trolley starts from rest at X. It rolls down to Y and eventually comes to rest at Z. X Z Y Which row is a possible summary of the energy changes during this process? X to Y Y to Z A p.e. → k.e. k.e. → p.e. key B p.e. → k.e. k.e. → p.e. + heat p.e. = potential energy C p.e. → k.e. + heat k.e. → p.e. k.e. = kinetic energy D p.e. → k.e. + heat k.e. → p.e. + heat

Accepted Answer

D

Question 17

17 An object of weight 15.0 N is pulled along a horizontal surface at a constant velocity of 2.00 m s–1. The force pulling the object is 12.0 N at 30° to the horizontal, as shown. 2.00 m s–1 12.0 N 30° 15.0 N What is the power used to move the object? A 12.0 W B 20.8 W C 24.0 W D 30.0 W

Accepted Answer

B

Question 18

18 Brownian motion can be demonstrated by illuminating smoke particles inside a closed, transparent container. When the particles are viewed using a microscope, bright specks of light are observed to move with constant, random motion. What cannot be inferred from this observation? A Air molecules are in constant motion. B Air molecules are in random motion. C Air pressure is due to air molecules colliding with the container. D The mass of an air molecule is much less than the mass of a smoke particle.

Accepted Answer

C

Question 19

19 A U-tube has one arm of area of cross-section A and the other of cross-section 4A. The tube contains water of density 1000 kg m–3 and oil of density 850 kg m–3, as shown. oil x 30.0 cm water The column of oil on top of the water in the left-hand arm is of length 30.0 cm. What is the difference in height x between the levels in the two arms of the tube? A 4.5 cm B 6.2 cm C 23.8 cm D 25.5 cm stress  when the metal is

Accepted Answer

A

Question 20

20 The Young modulus of a metal may be determined from the ratio strain stretched elastically. This can be done by making measurements when loads are added to a wire. Which measurements are needed to calculate the stress and strain of the wire in such an experiment? stress strain A wire diameter initial and final wire’s original mass added positions of load length B wire diameter mass added wire’s original initial and final length positions of load C wire’s original initial and final wire diameter mass added length positions of load D wire’s original mass added wire diameter initial and final length positions of load

Accepted Answer

B

Question 21

21 A copper wire of length 3.6 m and diameter 1.22 mm is stretched elastically by a force of 37 N. The Young modulus of copper is 1.17 × 1011 Pa. Which extension is caused by this force? A 0.24 mm B 0.76 mm C 0.97 mm D 3.1 mm

Accepted Answer

C

Question 22

22 When all the other features of a wave are constant, which relationship is correct? A Amplitude is directly proportional to velocity. B Intensity is directly proportional to amplitude. C Velocity is directly proportional to wavelength. D Wavelength is directly proportional to frequency.

Accepted Answer

C

Question 23

23 A vibrating rod makes a water wave in a ripple tank. The graph shows the displacement of the wave at one instant as it travels away from the rod. The wave speed is 2.0 cm s–1. displacement 4 / mm 2 0 0 0.4 0.8 1.2 distance / cm –2 –4 What is the frequency of the wave? A 0.8 Hz B 1.6 Hz C 2.5 Hz D 5.0 Hz

Accepted Answer

C

Question 24

24 Polarisation is a phenomenon associated with a certain type of wave. Which condition must be fulfilled if a wave is to be polarised? A It must be a light wave. B It must be a longitudinal wave. C It must be a radio wave. D It must be a transverse wave.

Accepted Answer

D

Question 25

25 Monochromatic light passes through two narrow slits and produces an interference pattern on a screen some distance away. The interference fringes are very close together. Which change would increase the distance between the fringes? A Increase the brightness of the light source. B Increase the distance between the slits and the screen. C Increase the distance between the two slits. D Increase the frequency of the light used.

Accepted Answer

B

Question 26

26 The following statements describe the diffraction of waves passing through a narrow slit. Which statement is not correct? A Both transverse and longitudinal waves can be diffracted. B Diffraction can only be seen with light when the light is monochromatic. C Red light diffracts through a greater angle than blue light. D The angle of diffraction increases when the width of the slit decreases.

Accepted Answer

B

Question 27

27 Monochromatic light is directed onto a pair of slits. Interference fringes that are 2.0 mm apart are observed on a distant screen. The frequency of the light used is then doubled and the slit separation is halved. How far apart are the new interference fringes? A 0.50 mm B 2.0 mm C 4.0 mm D 8.0 mm

Accepted Answer

B

Question 28

28 A diffraction grating has N lines per unit length and is placed at 90° to monochromatic light of wavelength λ. What is the expression for θ, the angle to the normal to the grating at which the third order diffraction peak is observed? 1 N λ 3 λ A sin θ = B sin θ = 3 C sin θ = 3N λ D sin θ = N 3 N λ

Accepted Answer

C

Question 29

29 Two parallel plates R and S are 2 mm apart in a vacuum. An electron with charge –1.6 × 10–19 C moves along a straight line in the electric field between the plates. The graph shows how the potential energy of the electron varies with its distance from plate R. +4.8 × 10–19 potential energy / J 0 0 1 2 distance / mm Which deduction is not correct? A The electric field between R and S is uniform. B The electric field strength is 3000 N C–1. C The force on the electron is constant. D The magnitude of the potential difference between R and S is 3 V.

Accepted Answer

B

Question 30

30 Two parallel, conducting plates with air between them are placed close to one another. The top plate is given a negative charge and the bottom one is earthed. Which diagram best represents the distribution of charges and the field between the plates? A B _ _ _ _ _ _ _ _ _ _ _ _ _ _ + + + + + + + C D _ _ _ _ _ _ _ _ _ _ _ _ _ _ + + + + + + +

Accepted Answer

A

Question 31

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.)? p.d. e.m.f. W W A q q W B Wq q W C Wq q D Wq Wq

Accepted Answer

A

Question 32

32 A cell of electromotive force E and internal resistance r is connected to an external resistor, as shown. E r I V The current in the circuit is I and the potential difference (p.d.) across the external resistor is V. In the equation (E – V ) = Ir , what does the term (E – V ) represent? A electrical energy per unit charge lost in the cell B electrical energy per unit charge lost in the complete circuit C electrical energy per unit charge lost in the connecting wire D electrical energy per unit charge lost in the external resistor

Accepted Answer

A

Question 33

33 Tensile strain may be measured by the change in electrical resistance of a device called a strain gauge. A strain gauge consists of folded fine metal wire mounted on a flexible insulating backing sheet. The strain gauge is firmly attached to the specimen. specimen strain gauge When the strain in the specimen is increased, what happens to the resistance of the wire? A It decreases, because the length decreases and the cross-sectional area increases. B It decreases, because the length increases and the cross-sectional area decreases. C It increases, because the length decreases and the cross-sectional area increases. D It increases, because the length increases and the cross-sectional area decreases.

Accepted Answer

D

Question 34

34 In the circuit shown, lamp P is rated 250 V, 50 W and lamp Q is rated 250 V, 200 W. The two lamps are connected in series to a 250 V power supply. 250 V P Q Assume that the resistance of each lamp remains constant. Which statement most accurately describes what happens when the switch is closed? A Lamp P emits four times as much power as lamp Q. B Lamp P emits twice as much power as lamp Q. C Lamp Q emits four times as much power as lamp P. D Lamp Q emits twice as much power as lamp P.

Accepted Answer

A

Question 35

35 The cooling system in many houses is controlled by three electrical switches. These are: • a thermostat switch that closes when the temperature rises to a given value, • a clock switch that closes at times when cooling may be required, • an override switch that closes to turn on the system when exceptional temperature rises occur. Which diagram shows the switches correctly connected between the power supply and the cooling system? thermostat clock A power supply cooling system override thermostat B power supply cooling system override clock thermostat override clock C power supply cooling system thermostat override D power supply cooling system clock

Accepted Answer

A

Question 36

36 A 110 V supply of negligible internal resistance is connected to a heater through a fuse and a switch. fuse switch C1 S+ 110 V heater S– C2 Terminals S+ and S– are the positive and negative terminals of the supply. Points C1 and C2 at either side of the heater are accessible for fault-finding. A voltmeter is connected between S– and C1. With the circuit working correctly, the voltmeter reading is noted with the switch closed. A fault occurs and the voltmeter is again connected between S– and C1 with the switch closed. Which fault would result in the same two voltmeter readings? A a break in the wire of the heater B a broken switch that cannot close correctly C a melted fuse D a short circuit in the heater

Accepted Answer

A

Question 37

37 A network of resistors, each of resistance 1 Ω, is connected as shown. 1 Ω 1 Ω 1 Ω V 1 Ω 1 Ω 1 Ω 1 A The current passing through the end resistor is 1 A. What is the potential difference (p.d.) V across the input terminals? A 2 V B 5 V C 8 V D 13 V

Accepted Answer

D

Question 38

38 Two α-particles with equal energies are fired towards the nucleus of a gold atom. Which diagram best represents their paths? A B gold nucleus gold nucleus C D gold nucleus gold nucleus

Accepted Answer

C

Question 39

39 When a nucleus emits an α-particle, how do the proton number and the nucleon number of the original nucleus change? proton number nucleon number A –4 –2 B –2 –2 C –2 –4 D +1 no change

Accepted Answer

C

Question 40

40 A simple theory of α-particle scattering by a thin metal foil uses the four assumptions given below. Which assumption is exact and is not an approximation? A Each α-particle interacts with just one nucleus. B The α-particles lose no kinetic energy when they are deflected. C The metal nuclei do not recoil. D Total momentum is conserved.

Accepted Answer

D

Question paper24 pages

Mark scheme2 pages

Questions as text

Q1 · What is the unit of the Young modulus when expressed in SI base units?

Q2 · The Reynolds number R is a constant used in the study of liquids flowing through pipes

Q3 · When a force F moves its point of application through a displacement s in the direction…

Q4 · Measurements are subject to systematic error and random error

Q5 · The density of the material of a coil of thin wire is to be found

Q6 · A cylindrical tube rolling down a slope of inclination θ moves a distance L in time T

Q7 · Variables x and y are related by the equation y = p – qx where p and q are constants

Q8 · A cheetah and an antelope are 100 m apart

Q9 · A boy throws a stone with a horizontal velocity of 10 m s–1 from the top of a building

Q10 · A football is released above a plane, sloping surface and bounces several times

Q11 · A rocket of mass 30 000 kg sits on a launch pad on the Earth’s surface

Q12 · Two equal masses X and Y are moving towards each other on a frictionless air track as…

Q13 · Which statement is correct with reference to perfectly elastic collisions between two…

Q14 · Which statement best describes a couple?

Q15 · A cross-shaped structure, freely pivoted at O, has arms of lengths 5.0 m, 4.0 m, 3.0 m…

Q16 · A trolley starts from rest at X

Q17 · An object of weight 15.0 N is pulled along a horizontal surface at a constant velocity of…

Q18 · Brownian motion can be demonstrated by illuminating smoke particles inside a closed…

Q19 · A U-tube has one arm of area of cross-section A and the other of cross-section 4A

Q20 · The Young modulus of a metal may be determined from the ratio strain stretched elastically

Q21 · A copper wire of length 3.6 m and diameter 1.22 mm is stretched elastically by a force of…

Q22 · When all the other features of a wave are constant, which relationship is correct?

Q23 · A vibrating rod makes a water wave in a ripple tank

Q24 · Polarisation is a phenomenon associated with a certain type of wave

Q25 · Monochromatic light passes through two narrow slits and produces an interference pattern…

Q26 · The following statements describe the diffraction of waves passing through a narrow slit

Q27 · Monochromatic light is directed onto a pair of slits

Q28 · A diffraction grating has N lines per unit length and is placed at 90° to monochromatic…

Q29 · Two parallel plates R and S are 2 mm apart in a vacuum

Q30 · Two parallel, conducting plates with air between them are placed close to one another

Q31 · In terms of energy transfer W and charge q, what are the definitions of potential…

Q32 · A cell of electromotive force E and internal resistance r is connected to an external…

Q33 · Tensile strain may be measured by the change in electrical resistance of a device called…

Q34 · In the circuit shown, lamp P is rated 250 V, 50 W and lamp Q is rated 250 V, 200 W

Q35 · The cooling system in many houses is controlled by three electrical switches

Q36 · A 110 V supply of negligible internal resistance is connected to a heater through a fuse…

Q37 · A network of resistors, each of resistance 1 Ω, is connected as shown

Q38 · Two α-particles with equal energies are fired towards the nucleus of a gold atom

Q39 · When a nucleus emits an α-particle, how do the proton number and the nucleon number of…

Q40 · A simple theory of α-particle scattering by a thin metal foil uses the four assumptions…

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