Physics 9702/11 May/June 2019: question paper and mark scheme

Question

Which unit can be expressed in base units as kg m2 s–2? A joule B newton C pascal D watt

Question

The luminosity L of a star is given by L = 4πr 2σT 4 where r is the radius of the star, T is the temperature of the star and σ is a constant with units W m–2 K–4. What are the SI base units of L ? A kg m2 s–1 B kg m2 s–2 C kg m2 s–3 D kg m2 s–4

Question

A particle has velocity V at an angle θ to the horizontal. The components of the particle’s velocity are Vv upwards in the vertical direction and Vh to the right in the horizontal direction, as shown. V Vv θ Vh What are expressions for the magnitude of V and for the angle θ ? magnitude of V θ V  h A (Vv2 + Vh2 ) tan–1   V  v V  B (Vv2 + Vh2 ) tan–1  v   Vh  V  h C (Vv 2 − Vh2) tan–1   V  v V  D (Vv 2 − Vh2) tan–1  v   Vh 

Question

A whale produces sound waves of frequency 5 Hz. The waves are detected by a microphone and displayed on an oscilloscope. What is the time-base setting on the oscilloscope? A 0.1 ms div–1 B 1 ms div–1 C 10 ms div–1 D 100 ms div–1

Question

The speed shown on a car’s speedometer is proportional to the rate of rotation of the tyres. The variation of the diameter of a tyre as it wears introduces an error in the speed shown on the speedometer. A car has new tyres of diameter 600 mm. The speedometer is accurately calibrated for this diameter. The tyres wear as shown, with 6 mm of material being removed from the outer surface. not to scale 6 mm new tyre worn tyre What is the error in the speed shown on the speedometer after this wear has taken place? A The speed shown is too high by 1%. B The speed shown is too high by 2%. C The speed shown is too low by 1%. D The speed shown is too low by 2%.

Question

A car travels along a straight horizontal road. The graph shows the variation of the velocity v of the car with time t for 6.0 s of its journey. 30 v / m s–1 20 10 0 0 1.0 2.0 3.0 4.0 5.0 6.0 t/s The brakes of the car are applied from t = 1.0 s to t = 4.0 s. How far does the car travel while the brakes are applied? A 21 m B 45 m C 67 m D 83 m

Question

A stone is thrown horizontally from the top of a cliff and falls into the sea some time later. Air resistance is negligible. Which graph shows how the vertical component vv of velocity of this stone varies with its horizontal component vh of velocity as it moves through the air? A B C D vv vv vv vv 0 0 0 0 0 vh 0 vh 0 vh 0 vh

Question

A positive charge of 2.6 × 10–8 C is in a uniform electric field of field strength 300 000 V m–1. How much work must be done on the charge in order to move it a distance of 4.0 mm in the opposite direction to the direction of the field? A 3.1 × 10–5 J B 2.0 × 10–3 J C 3.1 × 10–2 J D 2.0 J

Question

Each diagram illustrates a pair of forces of equal magnitude. Which diagram gives an example of a pair of forces that is described by Newton’s third law of motion? A B total gravitational resistive driving Earth attraction forces force gravitational Moon attraction C D support force lift weight weight

Question

A stone is dropped from a tall building. Air resistance is significant. The variation of distance fallen with time is shown by the dashed line. A second stone with the same dimensions but a smaller mass is dropped from the same building. Which line represents the motion of the second stone? A B distance path of first stone C D 0 0 time

Question

A helium atom of mass m collides normally with a wall. The atom arrives at the wall with speed v and then rebounds along its original path. Assume that the collision is perfectly elastic. What is the change in the momentum of the atom during its collision? A zero B 0.5 mv C mv D 2mv

Question

A cylindrical iceberg of height H floats in sea water. The top of the iceberg is at height h above the surface of the water. iceberg h H sea water The density of ice is ρ i and the density of sea water is ρ w. What is the height h of the iceberg above the sea water?  ρ   ρi  ρw ρi  ρw   ρw  ρi ρw

Question

A couple is applied to a tap as shown. F pivot tap d d F What is the torque of the couple? A Fd B Fd C 2Fd D 4Fd 2

Question

A crane uses a counterweight to stop it from toppling over when lifting a load, as shown. pivot counterweight 5000 kg 17.0 m not to 12.0 kN scale crane The counterweight has a mass of 5000 kg. The crane is required to lift a load of 12.0 kN and the horizontal distance from the pivot to the load is 17.0 m. How far from the pivot should the centre of gravity of the counterweight be positioned in order to keep the crane in equilibrium? A 0.0408 m B 0.240 m C 4.16 m D 40.8 m

Question

Three parallel forces act on an object. As a result of these forces, the object is in equilibrium. What must be correct for these forces? A They all act along the same line. B They all have the same magnitude. C They do not all act along the same line. D They do not all have the same magnitude.

Question

An empty glass beaker has a mass of 103 g. When filled with water, it has a total mass of 361 g. When filled with cooking oil, it has a total mass of 351 g. The density of water is 1.00 g cm–3. What is the density of the cooking oil? A 0.961 g cm–3 B 0.972 g cm–3 C 1.03 g cm–3 D 1.04 g cm–3

Question

A rope is attached to a sledge and a boy uses the rope to pull the sledge along a horizontal surface with a constant velocity. The tension in the rope is 100 N and the rope is held at 30° to the horizontal. 100 N rope sledge 30° horizontal surface How much work does the boy do on the sledge when he pulls it a distance of 5.0 m along the surface? A 250 J B 290 J C 430 J D 500 J

Question

The kinetic energy Ek of an object of mass m moving at speed v is given by the equation shown. Ek = 21 mv2 Which equation is not used in the derivation of this equation? A F = ma B s = vt C v2 = u2 + 2as D W = Fs

Question

A grasshopper of mass 0.12 g jumps vertically. It uses its back legs over a time of 0.020 s to jump, leaving the ground with a velocity of 3.0 m s–1. What is the average power developed by the legs of the grasshopper? A 9.0 × 10–3 W B 1.8 × 10–2 W C 2.7 × 10–2 W D 37 W

Question

A spring of original length 100 mm is compressed by a force. The graph shows the variation of the compressing force F with the length L of the spring. 12 F / N 10 8 6 4 2 0 40 50 60 70 80 90 100 L / mm What is the energy stored in the spring when the length is 70 mm? A 0.090 J B 0.21 J C 0.27 J D 0.63 J

Question

A 0.80 m length of steel wire and a 1.4 m length of brass wire are joined together. The combined wires are suspended from a fixed support and a force of 40 N is applied, as shown. steel brass 40 N The Young modulus of steel is 2.0 × 1011 Pa. The Young modulus of brass is 1.0 × 1011 Pa. Each wire has a cross-sectional area of 2.4 × 10–6 m2. The wires obey Hooke’s law. What is the total extension? Ignore the weights of the wires. A 1.7 × 10–4 m B 3.0 × 10–4 m C 3.9 × 10–4 m D 9.0 × 10–4 m

Question

A transverse wave in a medium has the waveform shown, where y = vertical displacement and x = horizontal distance. The speed of the wave is 20.0 cm s–1. +1.0 y / mm 0 x / cm 0 2.0 4.0 6.0 8.0 –1.0 A particle of the medium oscillates vertically. Which graph of vertical displacement y against time t best represents the motion of this particle? A B +1.0 +1.0 y / mm y / mm 0 t/s 0 t/s 0 0.10 0.20 0 2.0 4.0 –1.0 –1.0 C D +2.0 +2.0 y / mm y / mm 0 0 0 4.0 8.0 0 5.0 10.0 t/s t/s

Question

The graph shows the variation of the displacement of particles with distance along a transverse wave at an instant in time. The wave is moving to the right. Which position along the wave corresponds to a point where particles in the wave are travelling the fastest upwards? direction of displacement D travel of wave 0 0 A C distance B

Question

A long tube, filled with water, has a tap fitted at its base, as shown. A tuning fork is sounded above the tube and the water is allowed to run gradually out of the tube. tuning fork tube water tap A louder sound is heard at intervals as the water runs out of the tube. The change in water level between louder sounds is 32 cm. What is the wavelength of the sound in the tube? A 16 cm B 32 cm C 64 cm D 128 cm

Question

A stationary insect on the surface of water creates circular waves with its legs, as shown in diagram 1. The insect begins to travel to the right as shown in diagram 2. insect X X diagram 1 diagram 2 Which row describes the change to the waves at X caused by the movement of the insect? frequency wave speed A decreases increases B decreases stays the same C increases increases D increases stays the same

Question

A toy motorboat moving with constant velocity v vibrates up and down on the surface of a pond. This causes the boat to act as a source of circular water waves of frequency 2.0 Hz. The speed of the waves is 1.5 m s–1. A man, standing at the edge of the pond, observes that the waves from the boat approach him with a frequency of 3.0 Hz. The formula for Doppler effect calculations with sound waves may also be used for water waves. What is a possible value of v? speed / m s–1 direction A 0.50 directly away from the man B 0.50 directly towards the man C 0.75 directly away from the man D 0.75 directly towards the man

Question

Two progressive waves of frequency 300 Hz superpose to produce a stationary wave in which adjacent nodes are 1.5 m apart. What is the speed of the progressive waves? A 100 m s–1 B 200 m s–1 C 450 m s–1 D 900 m s–1

Question

The diagrams show the diffraction of water waves in a ripple tank as they pass through a gap between two barriers. Which diagram is correct? A B C D

Question

A double-slit interference experiment is set up as shown. * red light source single double screen slit slit not to scale Fringes are formed on the screen. The distance between successive bright fringes is found to be 4 mm. Two changes are then made to the experimental arrangement. The double slit is replaced by another double slit which has half the spacing. The screen is moved so that its distance from the double slit is twice as great. What is now the distance between successive bright fringes? A 1 mm B 4 mm C 8 mm D 16 mm

Question

The interference patterns from a diffraction grating and a double slit are compared. Using the diffraction grating, yellow light of the first order is seen at 30° to the normal to the grating. The same light produces interference fringes on a screen 1.0 m from the double slit. The slit separation is 500 times greater than the line spacing of the grating. What is the fringe separation on the screen? A 2.5 × 10–7 m B 1.0 × 10–5 m C 1.0 × 10–3 m D 1.0 × 10–1 m

Question

Which diagram shows the pattern of the electric field lines due to a negative point charge? A B C D

Question

In an electrolyte, the electric current is carried by charged particles (ions) in solution. What is not a possible value for the charge on an ion in solution? A – 4.8 × 10–19 C B +1.6 × 10–19 C C +3.2 × 10–19 C D +4.0 × 10–19 C

Question

A voltmeter connected between two points P and Q in an electrical circuit shows a reading of 1 V. V + – P Q Which statement is correct? A The energy needed to move +1 C of charge from P to Q is 1 J. B The energy needed to move +1 C of charge from Q to P is 1 J. C The energy needed to move one electron from P to Q is 1 J. D The energy needed to move one electron from Q to P is 1 J.

Question

Which graph best represents the variation with current I of potential difference V for a filament lamp? A B V V 0 0 0 I 0 I C D V V 0 0 0 I 0 I

Question

When a battery is connected to a resistor, the battery gradually becomes warm. This causes the internal resistance of the battery to increase whilst its electromotive force (e.m.f.) stays unchanged. As the internal resistance of the battery increases, how do the terminal potential difference and the output power change, if at all? terminal potential output power difference A decreases decreases B decreases unchanged C unchanged decreases D unchanged unchanged

Question

A cell is connected to a resistor of resistance 3.00 Ω. The current in the resistor is 1.00 A. A second identical resistor is added in parallel. The current becomes 1.93 A. What are the e.m.f. E and internal resistance r of the cell? E/V r/Ω A 0.113 3.11 B 3.04 0.0358 C 3.11 0.113 D 9.34 6.34

Question

A battery with negligible internal resistance is connected to three resistors, as shown. 0.30 A X All three resistors have the same resistance. The current in the battery is 0.30 A. What is the current in resistor X? A 0.10 A B 0.15 A C 0.20 A D 0.30 A

Question

The diagram shows a potentiometer and a fixed resistor connected across a 12 V battery of negligible internal resistance. fixed resistor 20 Ω 12 V 20 Ω output The fixed resistor and the potentiometer each have resistance 20 Ω. The circuit is designed to provide a variable output voltage. What is the range of output voltages? A 0–6V B 0 – 12 V C 6 – 12 V D 12 – 20 V

Question

Which statement about the alpha-particle scattering experiment provides evidence for the existence of the nucleus? A A tiny proportion of the alpha-particles are deflected through large angles. B Slower alpha-particles are deflected through larger angles. C The kinetic energies of the deflected alpha-particles are unchanged. D The number of alpha-particles deflected depends on the thickness of the foil.

Question

Some particles are a combination of three quarks. Which combination of quarks would not result in a particle with a charge of either +1.6 × 10–19 C or zero? A up, down, down B up, strange, strange C up, up, down D up, up, up