IGCSE 2021 Physics 0625/22 Oct/Nov

IGCSE 2021 0625/22 Oct/Nov (pdf)

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1. A student is taking some measurements.
   Which measurement is taken directly using a micrometer screw gauge?
2. Which graph represents an object that is moving at constant speed?
3. In which situation does object X have a greater mass than object Y?
   A Object X is in a larger gravitational field than object Y and both have the same weight.
   B Object X shows a greater resistance to change in motion than object Y and both experience the same resultant force.
   C Object X has a lower density than object Y and both occupy the same volume.
   D Object X moves at a greater speed than object Y and both possess the same kinetic energy.
4. Which substance in the table has the lowest density?
5. Three simple machines are shown.
   Which machines are an application of the moment of a force? A stone of mass 94 g is lowered into the water so that it is fully submerged as shown.
6. A spring, which obeys Hooke’s law, has an unstretched length of 10 cm.
   A load of 20N is suspended from the spring.
   The new length of the spring is 36 cm.
   What is the spring constant k of the spring?
7. A rocket is launched upwards from the surface of the Moon.
   Hot gases are ejected downwards over a very short period of time.
   Which statement is not correct?
   A The rocket experiences a downward force.
   B The rocket experiences an upward force.
   C The total momentum of the hot gases is equal to the momentum of the rocket.
   D The total momentum of the hot gases and rocket when the hot gases have been ejected is zero.
8. Electrical energy may be obtained from nuclear fission.
   In which order is the energy transferred in this process?
9. A box of mass m slides down a slope of length l against a frictional force F. It descends a vertical height d.
10. A rope, connected to a pulley system and motor, is used to lift different objects through different distances. The time taken to lift each object is the same. The diagrams are not to scale.
    Which motor requires the greatest power?

11. Which equation can be used to calculate the pressure at a depth h beneath the surface of a liquid?
12. A liquid is evaporating. The liquid is not boiling.
    Which statement about the liquid is correct at an instant in time?
    A Any molecule can escape, and from any part of the liquid.
    B Any molecule can escape, but only from the liquid’s surface.
    C Only molecules with enough energy can escape, and only from the liquid’s surface.
    D Only molecules with enough energy can escape, but from any part of the liquid.
13. A gas is contained in a sealed container in a laboratory. The temperature of the gas increases. What happens to the average speed and what happens to the total kinetic energy of the gas molecules?
14. An aluminium block has a mass of 200 g.
15. The diagram shows the apparatus used to measure the specific latent heat of vaporisation of water.
16. The diagram shows a pan used for cooking food.
17. The diagram shows the pattern of water waves as they pass through a narrow gap.
18. Which row is not correct for a wave on the surface of water?
19. The diagram shows how a ray of light refracts when going from air to Perspex.
20. The diagram shows a ray of light in air incident on a glass block. Some of the light is refracted and some of the light is reflected. Two angles, p and q, are marked on the diagram.
21. The letter F is reflected in a mirror.
22. The Sun emits infrared radiation and light.
    Light from the Sun reaches the Earth in 8 minutes.
    Which row gives correct information about the infrared radiation?
23. Which statement about electromagnetic waves is not correct?
24. What is ultrasound?
    A sound waves that are so loud that they damage human hearing
    B sound waves that are too high-pitched for humans to hear
    C sound waves that are too low-pitched for humans to hear
    D sound waves that are too quiet for humans to hear
25. Which diagram shows the electric field pattern between two oppositely charged parallel metal plates?
26. Which circuit symbol represents a component used to measure electric current?
27. The graph shows the current–voltage characteristic for a conductor
    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.
28. The diagram shows a circuit containing two resistors of resistance 1.0Ω and 2.0Ω.
    A voltmeter is connected across the 1.0 Ω resistor by connecting P to X.
    The reading on the voltmeter is 6.0V.
29. There is a current I in a resistor. The potential difference (p.d.) across the resistor is V.
    Which other physical quantity is needed to be able to determine the energy transferred W by the resistor?
30. The diagrams show pairs of circuits containing logic gates.
    In which diagram does the lower circuit of the pair behave differently from the upper circuit?
31. Several cells are connected in series, as shown.
32. Two resistors, with resistances R1 and R2, are connected in parallel.
    The resistance R1 is greater than the resistance R2.
33. The diagram shows a motor connected to an a.c. supply. The circuit is incomplete.
34. The diagram shows a wire between two magnets. An electromotive force (e.m.f.) is induced in the wire when it is moved up between the two magnets.
35. Four positions of a current-carrying coil in a magnetic field, as in a d.c. motor, are shown.
    In diagrams 2 and 4, the coil is at an angle of 45° to the field lines.
36. The diagram shows the magnetic field due to a current in a solenoid
37. The nucleus of an americium atom contains 146 neutrons and 95 protons. It decays by emitting an α-particle.
38. A sample of americium decays and changes into neptunium. The half-life of americium is 432 years.
    Which fraction of the americium will remain after 1728 years?
39. The graph shows the decay curves of four different radioactive isotopes.
    Which isotope has the largest half-life?
40. The diagrams show α-particles and β-particles passing through an electric field.
    Which diagram shows the correct paths of the α-particles and β-particles?

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