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1

Which unit is equivalent to the coulomb?

9. Electricity  →  9.2. Potential difference and power

5. Work, energy and power  →  5.1. Energy conservation

22. Quantum physics  →  22.1. Energy and momentum of a photon

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2

Which row shows a quantity and an incorrect unit?

5. Work, energy and power  →  5.1. Energy conservation

1. Physical quantities and units  →  1.1. Physical quantities

15. Ideal gases  →  15.1. The mole

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3

Two forces of equal magnitude are represented by two coplanar vectors. One is directed towards the east and the other is directed towards the north. What is the direction of a single force that will balance these two forces?

4. Forces, density and pressure  →  4.2. Equilibrium of forces

20. Magnetic fields  →  20.4. Magnetic fields due to currents

20. Magnetic fields  →  20.3. Force on a moving charge

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4

The density of paper is 800 kg m–3. A typical sheet of paper has a width of 210 mm and a length of 300 mm. The thickness of a pack of 500 sheets of paper is 50 mm. What is the mass of a single sheet of paper?

4. Forces, density and pressure  →  4.3. Density and pressure

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5

A person calculates the potential difference across a wire by using the measurements shown...

1. Physical quantities and units  →  1.3. Errors and uncertainties

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6

A cathode-ray oscilloscope (c.r.o.) is connected to an alternating voltage. The following trace is produced on the screen. 1 cm 1 cm The oscilloscope time-base setting is 0.5 ms cm–1 and the Y-plate sensitivity is 2 V cm–1. Which statement about the alternating voltage is correct?

7. Waves  →  7.1. Progressive waves

21. Alternating currents  →  21.1. Characteristics of alternating currents

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7

A stone of mass m is dropped from a tall building. There is significant air resistance. The acceleration of free fall is g. When the stone is falling at a constant velocity, which information is correct?

3. Dynamics  →  3.1. Momentum and Newton’s laws of motion

2. Kinematics  →  2.1. Equations of motion

12. Motion in a circle  →  12.2. Centripetal acceleration

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8

The velocity-time graph for an object is shown...

2. Kinematics  →  2.1. Equations of motion

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9

A girl throws a ball vertically upwards. It takes a time of 3.20 s to return to her hand. Assume air resistance is negligible. What is the initial speed with which the ball is thrown?

2. Kinematics  →  2.1. Equations of motion

3. Dynamics  →  3.2. Non-uniform motion

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10

Steel pellets, each with a mass of 0.60 g, fall vertically onto a horizontal plate at a rate of 100 pellets per minute. They strike the plate with a velocity of 5.0 m s–1 and rebound with a velocity of 4.0 m s–1. What is the average force exerted on the plate by the pellets?

3. Dynamics  →  3.1. Momentum and Newton’s laws of motion

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11

The diagram shows four forces applied to a circular object. 30 N 30 N 45 N 45 N Which row describes the resultant force and resultant torque on the object?

4. Forces, density and pressure  →  4.2. Equilibrium of forces

4. Forces, density and pressure  →  4.1. Turning effects of forces

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12

A charged oil drop is held stationary between two charged parallel plates. charged oil drop top plate bottom plate Which forces act on the oil drop?

18. Electric fields  →  18.2. Uniform electric fields

20. Magnetic fields  →  20.3. Force on a moving charge

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13

In which example is it not possible for the underlined body to be in equilibrium?

4. Forces, density and pressure  →  4.2. Equilibrium of forces

3. Dynamics  →  3.2. Non-uniform motion

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14

A car of mass 1100 kg is travelling at a constant speed of 15 m s–1 up a slope inclined at 10° to the horizontal. The combined frictional forces acting on the car are directed down the slope and are equal to 5 W , where W is the weight of the car. 10° 15 m s–1 What is the useful output power of the car’s engine?

5. Work, energy and power  →  5.1. Energy conservation

3. Dynamics  →  3.2. Non-uniform motion

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15

An old-fashioned 60 W lamp converts 95% of its energy supply into heat. A 4.0 W modern lamp has the same power output of light as the old-fashioned lamp. What is the efficiency of the modern lamp?

5. Work, energy and power  →  5.1. Energy conservation

9. Electricity  →  9.3. Resistance and resistivity

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16

A bead is released from rest at point P and slides along a wire, as shown...

3. Dynamics  →  3.2. Non-uniform motion

12. Motion in a circle  →  12.1. Kinematics of uniform circular motion

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17

A small diesel engine uses a volume of 1.5 × 104 cm3 of fuel per hour to produce a useful power output of 40 kW. It may be assumed that 34 kJ of energy is transferred to the engine when it uses 1.0 cm3 of fuel. What is the rate of transfer from the engine of energy that is wasted?

5. Work, energy and power  →  5.1. Energy conservation

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18

Two boxes X and Y have the same mass. Box X is lifted vertically through a height h by a force of magnitude F. Box Y is pulled along a slope by a force of the same magnitude to reach the same height, as shown...

5. Work, energy and power  →  5.1. Energy conservation

5. Work, energy and power  →  5.2. Gravitational potential energy and kinetic energy

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19

The force-extension graph of a metal wire is shown...

6. Deformation of solids  →  6.1. Stress and strain

6. Deformation of solids  →  6.2. Elastic and plastic behaviour

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20

The diagram shows a large crane on a construction site lifting a cube-shaped load at a constant speed. cable crane load A model is made of the crane, its load and the cable supporting the load. The material used for each part of the model is the same as that in the full-size crane, cable and load. The model is one tenth full-size in all linear dimensions. What is the ratio crane model the on cable the in stress crane size full the on cable the in stress - ?

6. Deformation of solids  →  6.1. Stress and strain

6. Deformation of solids  →  6.2. Elastic and plastic behaviour

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21

A wave pulse moves along a stretched rope in the direction shown...

2. Kinematics  →  2.1. Equations of motion

7. Waves  →  7.1. Progressive waves

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22

A wave has period T, wavelength λ and amplitude A. The wave is shown...

7. Waves  →  7.1. Progressive waves

2. Kinematics  →  2.1. Equations of motion

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23

The table lists possible orders of magnitude of the wavelengths of some of the principal radiations of the electromagnetic spectrum. Which row shows the correct orders of magnitude of the wavelengths?

7. Waves  →  7.4. Electromagnetic spectrum

11. Particle physics  →  11.1. Atoms, nuclei and radiation

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24

A vehicle carries a microwave transmitter that emits microwaves of a constant frequency. A stationary observer has a microwave receiver. The vehicle moves directly towards the observer at constant speed. The observer detects microwaves of frequency Fo. The vehicle then accelerates, still moving towards the observer, travels at higher steady speed for a time and then decelerates until it stops. What is the variation in the frequency of the microwaves that are detected by the observer?

7. Waves  →  7.3. Doppler effect for sound waves

8. Superposition  →  8.1. Stationary waves

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25

The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. 1.0 cm The time base setting is 0.20 µs cm–1. Which statement is correct?

7. Waves  →  7.1. Progressive waves

7. Waves  →  7.4. Electromagnetic spectrum

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26

In a double-slit interference experiment, light of frequency 6.0 × 1014 Hz is incident on a pair of slits. Bright fringes that are 3.0 mm apart are observed on a screen some distance away. What is the separation of the bright fringes when the frequency of the light is changed to 5.0 × 1014 Hz?

8. Superposition  →  8.3. Interference

8. Superposition  →  8.2. Diffraction

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27

Monochromatic light is incident on a pair of narrow slits a distance of 0.1 mm apart. A series of bright and dark fringes are observed on a screen a distance of 2.0 m away. The distance between adjacent bright fringes is 8.0 mm. monochromatic light screen second order dark fringe ‘zero’ order bright fringe distance between bright fringes = 8.0 mm 2.0 m (not to scale) What is the path difference between the light waves from the two slits that meet at the second order dark fringe?

8. Superposition  →  8.3. Interference

8. Superposition  →  8.2. Diffraction

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28

A tube of length L is open at both ends. A stationary wave is set up in this tube when a tuning fork vibrating with frequency fx is held at one end. This is the lowest frequency of stationary wave that can be formed in this tube. Another tube of length 2L is closed at one end. A stationary wave is set up in this tube when a tuning fork vibrating with frequency fy is held at the open end. This is the lowest frequency of stationary wave that can be formed in this tube. L frequency fx 2L frequency fy Assume the end correction for each tube is negligible. Which equation is correct?

8. Superposition  →  8.1. Stationary waves

7. Waves  →  7.1. Progressive waves

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29

Which statement gives a condition that enables diffraction to occur?

8. Superposition  →  8.2. Diffraction

8. Superposition  →  8.3. Interference

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30

An electron passes into the space between two parallel plates that are 5.0 cm apart and which are maintained at electric potentials of +2000 V and –500 V, respectively. 5.0 cm +2000 V –500 V electron What is the electric force on the electron?

18. Electric fields  →  18.5. Electric potential

18. Electric fields  →  18.3. Electric force between point charges

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31

Which statement about electric charges in a uniform electric field is not correct?

18. Electric fields  →  18.2. Uniform electric fields

20. Magnetic fields  →  20.3. Force on a moving charge

18. Electric fields  →  18.1. Electric fields and field lines

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32

The diagram shows a simple circuit. S R Which statement is correct?

10. D.C. circuits  →  10.1. Practical circuits

16. Thermodynamics  →  16.2. The first law of thermodynamics

5. Work, energy and power  →  5.1. Energy conservation

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33

A resistor has resistance R. When the potential difference across the resistor is V, the current in the resistor is I. The power dissipated in the resistor is P. Work W is done when charge Q flows through the resistor. What is not a valid relationship between these variables?

9. Electricity  →  9.3. Resistance and resistivity

9. Electricity  →  9.2. Potential difference and power

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34

A wire of resistance 9.55 Ω has a diameter of 0.280 mm. It is made of metal of resistivity 4.90 × 10–7 Ω m. What is the length of the wire?

9. Electricity  →  9.3. Resistance and resistivity

6. Deformation of solids  →  6.1. Stress and strain

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35

Charge carriers, each of charge q, move along a wire of fixed length. The number density of the charge carriers in the wire is n. What is also required, for this wire, to determine the average drift velocity of the charge carriers in terms of n and q?

9. Electricity  →  9.1. Electric current

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36

A potential divider circuit is constructed with one variable resistor X and one fixed resistor Y, as shown...

10. D.C. circuits  →  10.3. Potential dividers

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37

A cell of electromotive force (e.m.f.) E and negligible internal resistance is connected into a circuit, as shown...

10. D.C. circuits  →  10.1. Practical circuits

9. Electricity  →  9.3. Resistance and resistivity

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38

Five resistors are connected as shown...

10. D.C. circuits  →  10.2. Kirchhoff’s laws

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39

A nucleus of neptunium-236 contains 93 protons and 143 neutrons. This nucleus decays with the emission of an α-particle. The nucleus formed then emits a β– particle. Which diagram shows the changes in the number P of protons and the number N of neutrons in these nuclei?

11. Particle physics  →  11.1. Atoms, nuclei and radiation

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40

An isolated neutron decays to produce a proton, a β– particle and an antineutrino. Which row gives the quark composition of the neutron and the proton and the type of force that gives rise to this reaction?

11. Particle physics  →  11.2. Fundamental particles

11. Particle physics  →  11.1. Atoms, nuclei and radiation

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