Physics 0625/21 October/November 2020: question paper and mark scheme

Question

For which one of the following measurements would a micrometer screw gauge be most suitable? A length of this page B length of a pencil C diameter of a wire D diameter of an atom

Question

The speed–time graph represents a journey. speed X Y 0 0 time How does the graph show that the distance travelled in section X of the journey is greater than the distance travelled in section Y? A The area below section X of the graph is greater than the area below section Y. B The gradient of section X of the graph is greater than the gradient of section Y. C The speed at the end of section X of the journey is greater than the speed at the end of section Y. D The time for section X of the journey is greater than the time for section Y.

Question

A car is travelling at a velocity of 2.0 m / s. It accelerates at a constant 0.20 m / s2 for 2.5 minutes. What is the final velocity of the car? A 2.5 m / s B 5.2 m / s C 30 m / s D 32 m / s

Question

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

Question

A sphere P, made of steel, has a weight of 10 N on Earth. Another sphere Q, also made of steel, has a weight of 10 N on Mars. The gravitational field strength on Earth is greater than the gravitational field strength on Mars. Which statement is correct? A The mass of sphere P is the same as the mass of sphere Q. B The mass of sphere P is less than the mass of sphere Q. C On Mars, the weight of sphere P is more than 10 N. D On Earth, the weight of sphere Q is less than 10 N.

Question

A metal ball is attached to a cork and is lowered into a measuring cylinder, pulling the cork into the water, as shown. cork 80 cm3 ball 56 cm3 3 48 cm water ball and cork ball fully submerged both ball and cork above the water but cork above the water fully submerged The mass of the cork is 4.8 g. What is the density of the cork? A 0.15 g / cm3 B 0.20 g / cm3 C 0.60 g / cm3 D 5.0 g / cm3

Question

A uniform plank rests on a pivot at its centre. Two children P and Q sit on the plank in the positions shown. 1.2 m 1.5 m child P child Q pivot The mass of child P is 25 kg. The plank is balanced. What is the mass of child Q? A 20 kg B 25 kg C 31 kg D 45 kg

Question

The diagram shows three forces acting on an object. 6N 1N 9N What is the value of the resultant force acting on the object? A 2N B 10 N C 14 N D 16 N

Question

An object with a mass of 0.20 kg moves at 0.20 m / s, as shown. 0.20 m / s 0.20 kg Which other object has a momentum that is identical to the momentum of this object? A B 0.20 m / s 0.40 kg 0.20 kg 0.10 m / s C D 0.10 m / s 0.20 m / s 0.40 kg 0.20 kg

Question

A stone is dropped from rest at a height of 2.0 m above the surface of a planet. The planet has no atmosphere. The speed of the stone just before reaching the surface of the planet is 3.8 m / s. What is the acceleration of free fall on the planet? A zero B 1.9 m / s2 C 3.6 m / s2 D 7.2 m / s2

Question

An electric motor uses 1000 J of electrical energy. It provides 450 J of useful output energy. What is the efficiency of the motor? A 4.5% B 5.5% C 45% D 55%

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

A barometer reads 780 mm Hg. Mercury has a density of 1.36 × 104 kg / m3. What is the pressure of the atmosphere in N / m2? A 1.1 × 104 N / m2 B 1.1 × 105 N / m2 C 1.1 × 107 N / m2 D 1.1 × 108 N / m2

Question

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

Question

A student splashes water on to her face. Here are three statements about the effects. P The water uses energy to evaporate. Q The water gains energy from the student. R The face of the student cools. Which statements are correct? A P and Q only B P and R only C Q and R only D P, Q and R

Question

When a bridge is built, a gap is left between each concrete slab. Why are these gaps left? A Concrete expands on warm days. B Concrete contracts on warm days. C The gaps expand on warm days. D The gaps contract on cold days.

Question

The specific heat capacity of solid P is greater than that of solid Q. What does this statement mean? A Less energy is needed to raise the temperature by 1 °C of unit mass of solid P than unit mass of solid Q. B Less energy is needed to melt unit mass of solid P than unit mass of solid Q. C More energy is needed to raise the temperature by 1 °C of unit mass of solid P than unit mass of solid Q. D More energy is needed to melt unit mass of solid P than unit mass of solid Q.

Question

A student placed a number of ice cubes in a container with a hole in the base. He left them to melt so that the water dripped into a beaker placed on a balance. The student recorded the initial mass of the beaker and the final mass of the beaker and water after five minutes. ice in a container with a hole in the base beaker balance 0.05 kg 0.16 kg before after The specific latent heat of fusion for water is 334 J / g. How much energy was absorbed from the surroundings in order to melt the ice? A 37 J B 54 J C 37 000 J D 54 000 J

Question

The diagram shows four rods. Each rod is made of a different metal. P Q brass copper X silver iron S R Wax is used to attach small metal balls at the rod ends P, Q, R and S. Each rod is the same size. They are heated uniformly by a Bunsen burner at point X. As the rods warm up, the wax melts and the balls fall off. Why does the ball on the silver rod fall first? A Silver is the best conductor of heat. B Silver is the worst conductor of heat. C Silver is the best radiator of heat. D Silver is the worst radiator of heat.

Question

Four cups A, B, C and D contain hot coffee. Which cup keeps the coffee warm the longest? the outside the top of the cup surface of the cup A black covered with a lid B black no lid C white covered with a lid D white no lid

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

The diagram shows part of a diffracted wave pattern. barrier direction of waves Changes are made to the wavelength and to the gap size to produce a semicircular diffracted wave pattern. Which row produces the required semicircular diffracted wave pattern? gap in barrier wavelength A larger same B larger smaller C same larger D same smaller

Question

Which statement about a thin converging lens is correct? A All rays of light refracted by the lens pass through the principal focus. B All rays initially parallel to the principal axis of the lens are refracted through the principal focus. C The focal length of the lens is the distance between the image and the principal focus. D The focal length of the lens is the distance between the object and the image.

Question

The diagram shows white light passing through a prism. red violet white light Which description of what happens as the light passes into the prism is correct? A The speed of the red light is less than the speed of the violet light and the red light is the least refracted. B The speed of the red light is greater than the speed of the violet light and the red light is the least refracted. C The speed of the violet light is less than the speed of the red light and the violet light is the least refracted. D The speed of the violet light is greater than the speed of the red light and the violet light is the least refracted.

Question

Which row gives possible values for the speed of sound? speed in gas speed in liquid speed in solid m/s m/s m/s A 972 1450 3560 B 972 3560 1450 C 1450 3560 972 D 3560 972 1450

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 piece of steel is slightly magnetised. It is hit several times with a hammer. What effect will this have on the steel? the steel is parallel to the steel is at right-angles a strong magnetic field to a weak magnetic field A it becomes magnetised more strongly it becomes magnetised more strongly B it becomes magnetised more strongly it loses its magnetism C it loses its magnetism it becomes magnetised more strongly D it loses its magnetism it loses its magnetism

Question

Two soft-iron pins are suspended from the S pole of a bar magnet. Which diagram shows how the pins are deflected? A B C D S S S S

Question

A negatively charged plastic rod is brought near to an uncharged metal sphere and held there. What happens when the metal sphere is earthed? A Electrons flow from the metal sphere to earth. B Electrons flow from earth to the metal sphere. C Positive charge flows from the metal sphere to earth. D Positive charge flows from earth to the metal sphere.

Question

Which statement defines the electromotive force (e.m.f.) of a cell? A the current in the cell when 1.0 C of charge flows in 1.0 s B the current supplied by the cell to drive 1.0 C of charge around a complete circuit C the energy supplied by the cell to drive 1.0 C of charge around a complete circuit D the energy supplied by the cell to drive 1.0 A of current around a complete circuit

Question

Four wires are made of the same metal. Which wire has the greatest resistance? A a 100 cm long wire with a diameter of 3.0 mm B a 100 cm long wire with a diameter of 6.0 mm C a 10 cm long wire with a diameter of 3.0 mm D a 10 cm long wire with a diameter of 6.0 mm

Question

In which circuit is there just a single lamp lit? A B C D

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

Which combination of logic gates gives the truth table shown? inputs output X Y Z 0 0 1 0 1 1 1 0 1 1 1 0 A B X X Z Z Y Y C D X X Z Z Y Y

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 part of a long current-carrying conductor. At which point is the magnetic field strongest? A C D B

Question

A beam of particles moves through a magnetic field. In which situation do the particles experience a magnetic force? A a beam of α-particles moving parallel to the magnetic field lines B a beam of electrons moving parallel to the magnetic field lines C a beam of β-particles moving perpendicularly across the magnetic field lines D a beam of neutrons moving perpendicularly across the magnetic field lines

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

Two beams of radiation, P and Q, enter an electric field as shown. + + + + + + + + P Q – – – – – – – – Which type of radiations are P and Q? P Q A beta (β) alpha (α) B beta (β) gamma (γ) C gamma (γ) alpha (α) D gamma (γ) gamma (γ)

Question

Which equation represents the β-decay of lead-209? 209 0 209 A 82Pb + –1e o 83Bi 209 0 209 B 82Pb + –1e o 81Tl 209 209 0 C 82Pb o 83Bi + –1e 209 209 0 D 82Pb o 81Tl + –1e