Physics 9702/11 May/June 2021: question paper and mark scheme

Question

What is a reasonable estimate of the volume of an adult person? A 0.10 m3 B 0.50 m3 C 1.0 m3 D 2.0 m3

Question

Which combination of units could be used for expressing the power dissipated in a resistor? A newton per second (N s–1) B newton second (N s) C newton metre (N m) D newton metre per second (N m s–1)

Question

A force of 10 N and a force of 5 N act on an object. 10 N 150° 5N object The angle between the forces is 150°. The resultant force on the object can be resolved into a pair of perpendicular components. Which row shows numerical expressions for a possible pair of perpendicular components? force component / N force component / N A 10 cos 30° – 5 10 cos 30° B 10 sin 30° – 5 10 cos 30° C 10 – 5 cos 30° 5 sin 30° D 10 – 5 sin 30° 5 cos 30°

Question

A signal of frequency 25 Hz is displayed on the screen of a cathode-ray oscilloscope. 1 cm 1 cm What is the time-base setting? A 10 ms cm–1 B 20 ms cm–1 C 25 ms cm–1 D 40 ms cm–1

Question

A micrometer screw gauge is used to measure the diameter of a wire. The reading on the micrometer with the jaws closed is (–0.05 ± 0.02) mm. The reading with the wire in position between the two jaws is (+1.03 ± 0.02) mm. What is the diameter of the wire? A (0.98 ± 0.02) mm B (1.08 ± 0.02) mm C (0.98 ± 0.04) mm D (1.08 ± 0.04) mm

Question

A projectile is launched at an angle to the horizontal at time t = 0. It travels over horizontal ground, as shown. path of projectile ground Air resistance is negligible. Which graph best shows the variation with t of the speed of the projectile from when it is launched to when it lands on the ground? A B speed speed 0 0 0 t 0 t C D speed speed 0 0 0 t 0 t

Question

A train, initially at rest at a station, has a uniform acceleration of 0.20 m s–2 until it reaches a speed of 20 m s–1. It travels for a time at this constant speed and then has a uniform deceleration of 0.40 m s–2 until it comes to rest at the next station. The distance between the two stations is 3000 m. What is the time taken by the train to travel between the two stations? A 75 s B 150 s C 230 s D 300 s

Question

A rocket is fired from the Earth into space. Newton’s third law of motion describes how forces act in pairs. One of the forces of a pair is the weight of the rocket. What is the other force of this pair? A air resistance B force of the exhaust gases on the rocket C force of the rocket on the exhaust gases D gravitational force of the rocket on the Earth

Question

The graph shows how quantity P varies with quantity Q for a body falling vertically downwards in a uniform gravitational field with air resistance. P 0 0 Q Which pair of quantities could be represented by P and Q ? P Q A acceleration force of air resistance B acceleration time C velocity force of air resistance D velocity time

Question

Which quantities are conserved in an inelastic collision? kinetic energy total energy linear momentum A conserved not conserved conserved B conserved not conserved not conserved C not conserved conserved conserved D not conserved conserved not conserved

Question

A charged oil drop is held stationary between two charged parallel plates. top plate charged oil drop bottom plate Which forces act on the oil drop? A both electric and gravitational B electric only C gravitational only D neither electric nor gravitational

Question

Which pair of forces forms a couple with a torque of 30 N m? A B 30 N 40 N 1.0 m 2.0 m 10 N 30 N C D 25 N 15 N 1.0 m 2.0 m 5N 15 N

Question

A uniform rigid bar XZ with negligible mass is 1.20 m long. The bar is pivoted at point P. Three coplanar forces act on the bar as shown. Forces of 16 N and 20 N act perpendicularly to the bar at points X and Y respectively. Force F acts at point Z at an angle of 30° to the axis of the bar. The distances along the bar of the pivot and of the forces are shown. 20 N Z 30 F 16 N Y 0.60 m P 0.30 m X 0.30 m The bar experiences a resultant moment about P of 6.0 N m in a clockwise direction. What is the magnitude of F? A 9.2 N B 11 N C 16 N D 24 N

Question

Water of depth 9.0 cm is covered by oil of depth 5.0 cm in a measuring cylinder. The density of the water is 1000 kg m–3 and the density of the oil is 800 kg m–3. What is the total pressure exerted on the base of the measuring cylinder due to the oil and water? A 390 Pa B 880 Pa C 1200 Pa D 1300 Pa

Question

A rocket is fired upwards. As it accelerates upwards after leaving the launch pad, which forms of energy are changing? A chemical energy, gravitational potential energy and kinetic energy B chemical energy and gravitational potential energy only C chemical energy and kinetic energy only D gravitational potential energy and kinetic energy only

Question

A roll of tape of length 50 m requires a constant force of 20 N to unwrap it. 20 N roll of tape tape What is the work done in unwrapping the whole roll? A 0.4 J B 2.5 J C 500 J D 1000 J

Question

A trolley of mass 600 kg is initially at point P on a slope, at a height of 80 m above ground level, as shown. The trolley is released from rest and moves along the slope, first coming to rest at point Q, at height h above ground level. trolley mass 600 kg NOT TO P SCALE Q 80 m 1.5 km slope h ground level The total distance PQ moved by the trolley along the slope is 1.5 km. A constant resistive force of 300 N opposes the motion of the trolley on the slope. What is h ? A 3.5 m B 76 m C 79 m D 80 m

Question

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 30.0° to the horizontal, as shown. 2.00 m s–1 12.0 N 30.0 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

Question

The spring constants of four springs are determined by plotting the following graphs of force F against extension x. 1 2 3 4 10 20 100 10 F/N F/N F/N F/N 0 0 0 0 0 5 0 4 0 0.1 0 0.5 x / mm x / mm x / mm x / mm Which order of the graphs shows decreasing spring constants? A 2→1→3→4 B 3→4→2→1 C 4→2→1→3 D 4→3→2→1

Question

Forces are applied to the ends of a rod so that its length increases. The variation with force F of the extension e of the rod is shown. e P 0 0 F The point P is the elastic limit. Which shaded area represents the work done during the plastic deformation of the rod? A B e e P P 0 0 0 F 0 F C D e e P P 0 0 0 F 0 F

Question

Two identical waves are produced by sources at points P and Q. The waves travel along different paths to reach point R, as shown. 80 cm P R 100 cm Q Both waves have a wavelength of 6.0 cm. The waves are in phase at point R. What is the phase difference between the waves as they leave points P and Q? A 0° B 60° C 90° D 120°

Question

A longitudinal wave travelling from left to right has vibrations parallel to the direction of transfer of energy by the wave. The wave can be represented on a graph showing the variation with distance of the displacement of the particles from their equilibrium positions at one instant. Which point on the graph is the centre of a compression? direction of transfer of energy A displacement to the right B D 0 0 distance from source displacement to the left C

Question

A stationary wave is formed from two identical sound waves. A microphone is placed at a position of maximum loudness. It is then moved along the stationary wave from this first position of maximum loudness to the fourth position of maximum loudness. The microphone moves a distance of 12 cm. The speed of sound is 330 m s–1. What is the frequency of the sound waves? A 4100 Hz B 5500 Hz C 8300 Hz D 11 000 Hz

Question

An ambulance has a siren that emits sound of a constant frequency. The ambulance is moving directly towards a stationary observer. The ambulance decelerates as it is approaching the observer and then accelerates after it has passed the observer. How does the frequency of the sound heard by the observer change as the ambulance is approaching and as it is moving away from the observer? approaching moving away observer from observer A decreases decreases B decreases increases C increases decreases D increases increases

Question

Microwaves in a vacuum travel at speed X and have wavelength of order of magnitude Y. What are the speed and a possible order of magnitude of wavelength of X-rays in a vacuum? speed wavelength A X 10–8 Y B X 10–4 Y C 104 X Y D 108 X Y

Question

The diagram shows part of a stationary wave on a string. X and Y are points on the string. The vibrations at X and Y are 180° out of phase. X Y string positions of string when X and Y are at maximum displacement What is the distance between X and Y? A one-quarter of a wavelength B half a wavelength C one wavelength D two wavelengths

Question

Which wave behaviour is shown in the diagram? horizon sea wall sea sea wall beach wavefronts A diffraction B Doppler shift C interference D superposition

Question

A teacher sets up the apparatus shown to demonstrate a double-slit interference pattern on a screen. double screen single slit slit source of light q p r Which change to the apparatus will increase the fringe spacing? A decrease the distance p B decrease the distance q C decrease the distance r D decrease the wavelength of the light

Question

Light of a single unknown wavelength and blue light of a single wavelength are both incident normally on a diffraction grating. Two diffraction patterns are produced, one for each wavelength of light. The third-order maximum for the blue light occurs at the same angle as the second-order maximum for the light of unknown wavelength. The wavelength of the blue light is 480 nm. What is the unknown wavelength? A 320 nm B 720 nm C 960 nm D 1440 nm

Question

What is the electric field strength in a region where a proton accelerates at 2.00 m s–2 due to the field? A 11.4 pV m–1 B 5.22 nV m–1 C 10.4 nV m–1 D 20.9 nV m–1

Question

An oil drop of mass 2.6 × 10–15 kg and with a charge of – 4.8 × 10–19 C is in a vacuum between two horizontal plates. The plates have a separation of 2.0 cm and a potential difference (p.d.) between them of 1200 V, as shown. +1200 V oil drop plates 2.0 cm 0V Which statement describes the motion of the oil drop? A It is stationary. B It has a downward acceleration of 9.7 m s–2. C It has an upward acceleration of 1.3 m s–2. D It has an upward acceleration of 11 m s–2.

Question

Which two units are used to define the coulomb? A ampere and second B ampere and volt C volt and ohm D volt and second

Question

A mobile phone battery is charged by connecting it to a constant potential difference of 5.0 V. After a time of 1.0 hour, the initial current of 0.50 A slowly decreases to zero, as shown. 0.5 current / A 0 0 1.0 2.0 time / hours What is the best estimate of the energy transferred to the battery during the time of 2.0 hours shown in the graph? A 2700 J B 9000 J C 14 000 J D 18 000 J

Question

A length of wire is connected into an electric circuit. The current in the wire is measured. Which change on its own could increase the current in the wire? A an increase in the length of the wire B an increase in the radius of the wire C an increase in the resistance of the wire D an increase in the resistivity of the wire

Question

A cell is described as having an electromotive force (e.m.f.) of 6 V. What does this mean? A 1 coulomb of charge always dissipates 6 J of energy in the internal resistance of the cell. B 1 electron gains 6 J of energy when passing through the cell. C There is a potential difference of 6 V applied across any external circuit connected to the cell. D When 1 coulomb of charge passes through the cell, 6 J of chemical energy is transformed.

Question

The diagram shows a network of resistors. Each resistor has resistance R. R R X R R Y R R What is the total resistance of the network between points X and Y? A R B 6R C 11R D 6R 6 11 6

Question

Three resistors are connected in series with a battery, as shown. The battery has negligible internal resistance. 120 Ω 6.0 V 180 Ω 150 Ω What is the potential difference across the 180 Ω resistor? A 1.6 V B 2.4 V C 3.6 V D 4.0 V

Question

A potentiometer circuit is used to determine the unknown electromotive force (e.m.f.) of a cell X. In the circuit shown, E is a cell with an e.m.f. that is known accurately. QR is the potentiometer wire, which has a movable contact S. Contact S is connected to a galvanometer and to cell X. E S Q R X What is not a necessary requirement to determine the e.m.f. of X from the circuit? A The e.m.f. of cell X must be lower than the e.m.f. of cell E. B The internal resistance of cell X must be known. C The lengths QS and QR must be determined accurately. D The resistance of the wire QR must be proportional to its length.

Question

A nucleus of uranium, 235 92 U, undergoes a series of decays. During the series of decays, two α-particles and one β– particle are emitted. As a result, a nucleus of actinium, Ac, is formed. What is the correct notation for the nuclide of actinium that is formed? 227 227 231 231 A 87 Ac B 89 Ac C 87 Ac D 89 Ac

Question

Which particle is a fundamental particle? A electron B hadron C neutron D proton