# IGCSE 2021 Physics 0625/22 May/June

Cambridge CIE IGCSE Past Papers and solutions.
Questions and Worked Solutions for IGCSE Physics 2021 0625/22 May/June Paper 2.

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IGCSE 2021 0625/22 May/June (pdf)

1. Which piece of apparatus is the most suitable for measuring the mass of a pencil sharpener?
A digital balance
B measuring cylinder
C newton meter
D ruler
2. Four balls with different masses are dropped from the heights shown.
Air resistance may be ignored.
Which ball has the smallest average speed?
3. A ball is thrown vertically upwards through the air. Air resistance acts on the ball.
Which graph shows how its speed varies with time?
4. What is the best description of the meaning of the ‘mass’ of an object?
5. A measuring cylinder contains 40 cm3 of water.
A stone of mass 94 g is lowered into the water so that it is fully submerged as shown.
6. The extension–load graph for a spring is shown. The unstretched length of the spring is 17.0 cm.
7. A satellite orbits the Earth in an anticlockwise direction at constant speed, as shown.
When the satellite is in the position shown, in which direction does the resultant force act upon it?
8. A tennis ball has a mass of 57 g.
A tennis player hits the tennis ball with a tennis racket. The tennis ball has a velocity of 25 m / s when it hits the racket.
The velocity of the tennis ball when it leaves the player’s racket is 15 m / s in the opposite direction from its approaching direction.
The average force exerted by the tennis racket on the ball is 35N.
For how long is the tennis ball in contact with the tennis racket?
9. This question is about four methods used to produce electrical energy.
Which method has a correct description?
10. A stone is released from rest from a high building on Earth. Air resistance is negligible. What is its velocity when it has fallen 5 m?

1. The power input to an electric motor is 400 W. The efficiency of the motor is 85%. How much power is wasted?
2. A book has a mass of 400 g.
The surface of the book in contact with a table has dimensions 0.10 m  0.20 m.
The gravitational field strength g is 10 N/ kg.
What is the pressure exerted on the table due to the book?
3. A horizontal metal plate of area 0.50 m2 lies at the bottom of a lake at a depth of 40 m.
The density of water is 1000 kg/ m3 and the gravitational field strength g is 10 N/ kg.
What is the downward force acting on the plate due to the water?
4. Which row describes the forces between the molecules and the motion of the molecules in a gas?
5. Very small pollen grains are suspended in water. A bright light shines from the side. When looked at through a microscope, small specks of light are seen to be moving in a random, jerky manner.
6. A hole is drilled in a metal plate. What happens to the length of the plate and to the diameter of the hole when the plate is cooled?
7. Which statement describes a sensitive liquid-in-glass thermometer?
A a thermometer which can be used to measure very high and very low values of temperature
B a thermometer which gives the same increase in length of the liquid column for each degree of temperature rise
C a thermometer which is accurate because it has been calibrated
D a thermometer which gives a large increase in the length of the liquid column for each degree of temperature rise
8. A block of aluminium of mass 2.0 kg has an initial temperature of 20 C. It absorbs 7300 J of thermal energy.
The specific heat capacity of aluminium is 913 J /(kg C).
What is the final temperature of the aluminium block?
9. A student sets up four cans. Each can contains the same mass of water at 90 C.
The cans are identical except for the outside surfaces.
Which can will cool down the fastest?
10. Thermal energy is transferred by conduction in a metal bar.
Which statement is not correct?
11. A water wave passes into a region where the wave travels more slowly.
As it passes into the slow region, what happens to the frequency and what happens to the wavelength of the wave?
12. Light travelling at a speed of 3.0  108 m / s strikes the surface of a glass block and undergoes refraction as it enters the block.
The diagram shows a ray of this light before and after it enters the block.
13. Which statement about the image of an object formed in a plane mirror is correct?
A It is smaller than the object.
B It is the same size as the object.
C It is larger than the object.
D It is inverted.
14. An object is placed in front of a thin converging lens.
The diagram shows the paths of two rays from the top of the object.
15. Here are three statements about the speed of electromagnetic waves.
1 The speed of an electromagnetic wave in a vacuum is 340 m / s.
2 The speed of an electromagnetic wave in a vacuum is 3.0  108 m / s.
3 The speed of an electromagnetic wave in a vacuum is approximately the same as in air.
Which statements are correct?
16. The sound from a loudspeaker must pass through two materials to reach a microphone.
17. Which method does not demagnetise a bar magnet?
A Heat the bar magnet and place it in the east-west direction to cool.
B Place the bar magnet in the east-west direction and hammer it.
C Place the bar magnet in a coil connected to an a.c. supply and slowly withdraw it.
D Place the bar magnet in a coil connected to a d.c. supply and slowly withdraw it.
18. Three piles of small nails, P, Q and R, are placed on a bench below three electromagnets.
One set of nails is made of copper, one of soft iron and one of steel.
Diagram 1 shows the situation when the electromagnets are switched on.
Diagram 2 shows the situation when the electromagnets are then switched off.
19. A magnet is suspended by a cotton thread.
The magnet is displaced then allowed to swing freely until it comes to rest.
Why does the magnet always come to rest pointing in the same direction?
20. A student rubs a plastic rod with a cloth.
The rod becomes positively charged.
What has happened to the rod?
21. An isolated metal sphere is positively charged.
It is then brought near to another isolated metal sphere that is neutral.
22. Which circuit has a zero reading on the ammeter?
23. Two 10 resistors are connected in series and then in parallel.
What is the combined resistance in each case?
24. The diagram shows a combination of four logic gates that produce an output signal at R that depends on the states of the inputs P and Q.
25. A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the solenoid while the rod is moving
26. The diagram shows a transformer.
27. Which row correctly states how nuclei behave during nuclear fission and during nuclear fusion?
28. The charge on a proton is e. What is the charge on an electron and what is the charge on a neutron?
29. Some radioactive nuclei decay to give new nuclei which are also radioactive. Part of a series of decays is shown.
30. The graph shows the activity of a radioactive source over a period of time.

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