Physics 0625/12 October/November 2020: question paper and mark scheme

Question

A student measures the volumes of three liquids using three different measuring cylinders. cm3 40 30 cm3 cm3 2.0 4.0 20 1.5 3.0 1.0 2.0 10 0.5 1.0 1 2 3 The table shows the volumes recorded by the student. measuring volume cylinder / cm3 1 1.2 2 2.2 3 25 Which readings are correctly recorded? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 1 only

Question

A car driver measures the time taken to complete four separate journeys. In which journey does the driver have the greatest average speed? distance / km time / h A 60 2 B 60 3 C 120 3 D 120 4

Question

The graph shows how the speed of an object varies with time. speed 0 P Q time Which row describes the motion of the object at times P and Q? P Q A at rest accelerating B at rest decelerating C moving with constant speed accelerating D moving with constant speed decelerating

Question

A stone has a weight of 4.1 N. What is the mass of the stone? A 0.41 kg B 2.4 kg C 4.1 kg D 41 kg

Question

Which quantity is weight an example of? A acceleration B force C mass D pressure

Question

A rectangular metal block is 20 cm long. The cross-sectional area of the block is 25 cm2. The mass of the block is 4000 g. What is the density of the metal? A 0.13 g / cm3 B 0.32 g / cm3 C 8.0 g / cm3 D 2000 g / cm3

Question

A force of 4.0 N acts on a beam as shown. beam x pivot 4.0 N The line of action of the force is a distance x from a pivot. The moment of this force about this pivot is 8.0 N cm. What is distance x? A 0.50 cm B 2.0 cm C 12 cm D 32 cm

Question

The diagram shows a stand. The stand holds a heavy mass above the bench. heavy mass stand bench base Which two changes would definitely make the stand more stable? A Lower the mass and make the base narrower. B Lower the mass and make the base wider. C Raise the mass and make the base narrower. D Raise the mass and make the base wider.

Question

Two wind farms supply electrical energy to consumers in different ways. Wind farm 1 supplies energy directly to consumers and for every 1000 J of energy extracted from the wind, 360 J is transferred to consumers as electrical energy. Wind farm 2 stores electrical energy in batteries and then supplies energy from the batteries to the consumer. For every 1000 J of energy extracted from the wind, 270 J is transferred to consumers as electrical energy. Which statement about the two wind farms is correct? A Wind farm 1 is less reliable and less efficient than wind farm 2. B Wind farm 1 is less reliable but more efficient than wind farm 2. C Wind farm 1 is more reliable but less efficient than wind farm 2. D Wind farm 1 is more reliable and more efficient than wind farm 2.

Question

Work is done. Which physical quantity is transferred? A distance B energy C force D temperature

Question

To calculate the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power? the distance that the force the time for which the moves the object force acts on the object A key B = needed C = not needed D

Question

The diagram shows a mercury barometer. Which height is used as a measurement of atmospheric pressure? D mercury C B A

Question

A man who weighs 540 N stands with both feet on the ground. The area of contact between one foot and the ground is 0.015 m2. What is the pressure exerted on the floor by the man? A 1800 N / m2 B 3600 N / m2 C 18 000 N / m2 D 36 000 N / m2

Question

On a warm day, a driver checks the air pressure in a car tyre. At night, the temperature drops and the air pressure in the tyre decreases. There are no air leaks in the tyre. Why does the pressure decrease? A The air molecules in the tyre move more slowly. B The air molecules in the tyre stop moving. C The volume of the air in the tyre decreases. D The volume of the air in the tyre increases.

Question

Wet clothes are put out on a line to allow the water in the clothes to evaporate. Which type of weather would cause the water to evaporate most quickly? A a cold day with no wind B a cold day with wind C a hot day with no wind D a hot day with wind

Question

A bimetallic strip is used to control the temperature of electrical appliances. It is made of two different metals fixed together. The diagram shows the shape of the bimetallic strip before and after heating. metal P metal Q before heating after heating Which statement is correct? A Metal P contracts more than metal Q on heating. B Metal Q contracts more than metal P on heating. C Metal P expands more than metal Q on heating. D Metal Q expands more than metal P on heating.

Question

Samples of four different substances are heated in turn by the same heater, for the same time duration and in the same conditions. The increase in temperature for each sample is recorded in the table. Which sample has the highest thermal capacity? temperature sample rise / °C A aluminium 6.0 B copper 8.0 C mercury 10.0 D water 5.0

Question

Thermal energy is supplied at the same rate to four bars made from different materials. thermal energy X Y After several minutes, there is a temperature difference between X and Y for each bar. Which statement identifies the bar with the greatest temperature difference between points X and Y, and gives the correct reason? A copper because it is a good conductor of thermal energy B lead because it is the densest metal C plastic because it is a poor conductor of thermal energy D wood because it is a good conductor of thermal energy

Question

A scientist measures the air temperature at different heights from the floor in a cave. The results are recorded in the table. height / m temperature / °C 0 10 10 11 20 13 30 14 40 16 Why does altering the height affect the temperature of the air? A The molecules in warm air have less energy than the molecules in cool air. B The molecules in cool air are further apart than the molecules in warm air. C Warm air is less dense than cool air. D Cool air rises above warm air.

Question

Which row correctly describes light waves? wave type direction of vibrations A longitudinal parallel to direction of wave travel B longitudinal perpendicular to direction of wave travel C transverse parallel to direction of wave travel D transverse perpendicular to direction of wave travel

Question

Waves travel across the surface of water. What is meant by the amplitude of the wave? A the maximum distance of a water particle from its mean position B how far the wave travels every second C the number of waves passing a point every second D the distance between the top of consecutive waves

Question

Which diagram shows the image correctly formed by reflection? A B object image object image mirror mirror C D object image object image mirror mirror

Question

A man sees a stone at the bottom of a pool of water. Which path could be taken by light from the stone to the man? man A B C D air water stone

Question

White light can be split into different colours by passing it through a prism. What is the name of this process? A diffraction B dispersion C reflection D total internal reflection

Question

Which type of radiation does a remote controller use to send its instructions to a TV set? A γ-rays B infrared radiation C ultraviolet radiation D X-rays

Question

A police car with its siren sounding is stationary in heavy traffic. A pedestrian notices that, although the loudness of the sound produced does not change, the pitch varies. Which row describes the amplitude and the frequency of the sound? amplitude frequency A constant constant B constant varying C varying constant D varying varying

Question

A student sets up four experiments using bar magnets and other metal objects. The N and S poles of the bar magnets are labelled N and S. 1 2 S N S N S N iron 3 4 S N copper S N N S Which pairs attract each other? A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

Question

A student uses three small plotting compasses to investigate the magnetic field around a bar magnet. Which diagram shows the directions in which the compass needles point? A B N S N S C D N S N S

Question

A polythene rod is charged negatively by rubbing it with a cloth. Which statement explains why the rod has become charged? A The rod has gained electrons. B The rod has gained protons. C The rod has lost electrons. D The rod has lost protons.

Question

There is a current in a variable resistor when a potential difference (p.d.) is applied across it. In which situation is the current increased? A Decrease the p.d. and keep the resistance the same. B Decrease the p.d. and increase the resistance. C Keep the p.d. the same and decrease the resistance. D Keep the p.d. the same and increase the resistance.

Question

The circuit shown includes a battery, three lamps X, Y and Z and three switches S1, S2 and S3. lamp X S1 S2 lamp Y S3 lamp Z Lamp X is off but lamps Y and Z are lit. Which switches are closed? A S1 and S2 only B S1 and S3 only C S2 and S3 only D S1, S2 and S3

Question

A student uses four ammeters P, Q, R and S to measure the current in different parts of the circuit shown. P Q A A R A S A Which two ammeters read the largest current? A P and Q B P and R C R and Q D R and S

Question

An electrical appliance is powered from a mains supply. The appliance normally uses a current of 3 A, but the current briefly rises to 4 A at the instant the appliance is switched on. The cable to the appliance is designed for currents up to 6 A. A fuse is used to protect the circuit. What should be the rating of the fuse? A 1A B 3A C 5A D 13 A

Question

A student investigates electromagnetic induction. She moves the N pole of a magnet quickly towards a coil of wire. There is a reading on the galvanometer. coil of wire bar magnet S N What can she do to get a greater reading on the galvanometer? A Hold the bar magnet stationary inside the coil. B Move the bar magnet slowly away from the coil. C Use a coil of wire with fewer turns on it. D Use a stronger bar magnet.

Question

A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1 000 B 240 48 000 C 480 24 D 2000 100

Question

The diagram shows a wire carrying a current in the direction shown. The wire is between the poles of a magnet. A force is produced on the wire out of the page. wire N S direction of current The wire and magnet are now put into different arrangements X, Y and Z. The arrow shows the direction of the current in each case. X Y Z N S S N S N In which arrangements is the force on the wire out of the page? A X only B X and Y C X and Z D Z only

Question

Which statement is correct for the nucleus of any atom? A The nucleus contains electrons, neutrons and protons. B The nucleus contains the same number of protons as neutrons. C The nucleus has a total charge of zero. D The nucleus is very small compared with the size of the atom.

Question

The symbol represents a nucleus of zinc. Which row gives the numbers of protons and neutrons in this nucleus? number of number of protons neutrons A 30 38 B 30 68 C 38 30 D 38 68

Question

Three types of radiation are α-radiation, β-radiation and γ-radiation. Which statement is correct? A α-radiation is less ionising than β-radiation. B α-radiation is less ionising than γ-radiation. C γ-radiation produces no ionisation. D β-radiation is more ionising than γ-radiation.

Question

The graph shows the radioactive decay curve of a substance. 1000 count rate counts / s 750 500 250 0 0 5 10 15 20 25 30 time / years What is the half-life of this substance? A 0.5 years B 5 years C 15 years D 30 years