# IGCSE Grade 9 Physics- Important Physics MCQs

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In this article, we are providing you important IGCSE Grade 9 Physics MCQs. By answering these questions, you will understand the technological world in which you live. You will be able take an informed interest in how and why things happen. You will also be able to develop an understanding of the scientific skills, which is essential for Cambridge International A Level.

## IGCSE Grade 9 Physics- Important Physics MCQs

1. An object is released from rest and falls to Earth. During its fall, the object is affected by air resistance. The air resistance eventually reaches a constant value.
Which description about successive stages of the motion of the object is correct?

A. constant acceleration, then constant deceleration
B. constant deceleration, then zero acceleration
C. decreasing acceleration, then constant deceleration
D. decreasing acceleration, then zero acceleration

2. The diameter of a copper wire is thought to be approximately 0.3 mm. Which instrument should be used to obtain a more accurate measurement of the diameter of the wire?
A. measuring tape
B. metre rule
C. micrometer
D. ruler

3.  A concrete post is carried up a very high mountain. At the top of the mountain, the gravitational field is slightly weaker than at the bottom. What is the effect of this weaker field on the mass and on the weight of the post at the top of the mountain?

4. Which is a unit of acceleration?
A. g/cm3
B. m/s
C. m/s2
D. N/m

5. The diagram shows an object moving at a constant speed in a circular path in the direction shown.
A force acts on the object to keep it in the circular path.
In which labelled direction does this force act, when the object is in the position shown?

6. The diagram shows a cuboid block made from a metal of density 2.5/cm3

What is the mass of the block?
A. 8.0g
B. 16g
C. 50g
D. 100g

7. Which is the value of a vector quantity?
A. 200V
B. 100kg/m3
C. 20m/s, east
D. 50J/(kg°C)

8. A spring obeys Hooke’s law.
Which graph is obtained by plotting the extension of the spring against the load applied?

9. The table gives four energy sources and states whether the energy of the source is derived from the Sun. Which row is correct?

10. A force acts on an area to produce a pressure.
Which changes produce the same pressure?
A. double the area and double the force
B. double the area and halve the force
C. double the area and make the force four times bigger
D. halve the area and double the force

11. A weight-lifter raises a 2000N weight through a vertical height of 2.0m in 0.80s.

What useful power does he develop in doing this?
A. 800W
B. 3200W
C. 4000W
D. 5000W12. wind turbine generates 54kW of useful power from an input of 180kW of wind power. Which calculation gives the percentage efficiency of the turbine?
13. Identical toy bricks are placed one on top of another to make a tower on a table.
Which graph shows the relationship between the pressure P that the tower exerts on the table and the weight W of the tower?
14. Which quantity gives the thermal capacity of a solid object?
A. the energy lost by radiation from the object in 1.0s
B. the energy needed to melt the object
C. the energy needed to raise the temperature of the object by 1.0°C
D.the total amount of thermal energy in the object.15. Gases can be compressed, but liquids cannot.
Which statement explains this difference?
A. Each molecule in a gas is more compressible than each molecule in a liquid.
B. Molecules in a gas are further apart than molecules in a liquid.
C. Molecules in a gas attract each other more strongly than molecules in a liquid.
D. Molecules in a gas move more slowly than molecules in a liquid.16. In an experiment, a liquid is heated at a constant rate. The temperature of the liquid increases and eventually becomes constant.
Which statement about the experiment is correct?
A. Boiling occurs at all temperatures but only on the liquid surface.
B. Boiling occurs throughout the liquid but only at the constant temperature.
C. Evaporation occurs throughout the liquid and at all temperatures.
D. Evaporation occurs only at the constant temperature and only on the liquid surface.

17. The diagram shows a quantity of gas trapped in a cylinder. The piston is pushed in slowly and the gas is compressed. The temperature of the gas does not change.

Which graph shows the relationship between the pressure and the volume of the gas?

18. One end of a copper rod is heated. What is one method by which thermal energy is transferred in the copper rod?
A. Free electrons transfer energy from the cooler end to the hotter end.
B. Free electrons transfer energy from the hotter end to the cooler end.
C. Molecules of copper move from the cooler end to the hotter end.
D. Molecules of copper move from the hotter end to the cooler end

19. To mark a temperature scale on a thermometer, standard temperatures known as fixed points are needed. Which of these is a fixed point on the Celsius scale?
A. room temperature
B. the temperature inside a freezer
C. the temperature of pure melting ice
D. the temperature of pure warm water

20. Which is a unit of wavelength?
A. hertz
B. metre
C. metre per second
D. second

21. Two plastic cups are placed one inside the other. A small spacer keeps the two cups separated. Hot water is poured into the inner cup and a lid is put on top, as shown.

Which statement is correct?
A. The bench is heated by convection from the bottom of the outer cup.
B. The lid reduces the energy lost by convection.
C. There is no thermal conduction through the sides of either cup.
D.Thermal radiation is prevented by the small air gap

22. Which diagram shows how a converging lens is used as a magnifying glass?

23. Which diagram correctly shows a ray of light reflected by a plane mirror?

24. Which methods could be used to demagnetise a magnet?
method 1: place it in an east-west direction and hammer it
method 2: place it in an east-west direction and heat it until it is red hot
method 3: pull it slowly from a coil that is carrying an alternating current
method 4: put it slowly into a coil that is carrying a direct current

A. methods 1, 2 and 3

B. methods 2, 3 and 4

C. methods 1 and 2 only

D. methods 3 and 4 only

25. In which pair are both materials magnetic?
A. aluminium and copper
B. copper and iron
C. iron and steel
D. steel and aluminium

26. The speed of sound in air is 340m/s.
Which row gives typical values for the speed of sound in a liquid and in a solid?

27. A sound wave travels from a point X to a point Y.
X     Y

Which diagram represents the movement of the air molecules, due to the sound wave, in the region between X and Y?

28. Which produces an electromotive force (e.m.f.)?
A. a battery
B. a filament lamp
C. a resistor
D. a spring balance

29. Which circuit shows the directions of the conventional current I and the flow of electrons?

30. The table describes four different resistance wires. They are all made from the same metal. Which wire has the smallest resistance?

31. After some building work in a house, a bare (uninsulated) live wire is left protruding from a wall. What is the greatest hazard?
A. a fire
B. a fuse blows
C. an electric shock
D. no current flows

32. A battery charger plugs into a 230 V a.c. supply. The charger is used to charge a 6.0 V d.c. battery. The charger contains diodes and a transformer. What is the purpose of these components?

33. The diagram shows a potential divider connected to two voltmeters P and Q.

The resistance of the variable resistor is decreased.
Which row shows what happens to the reading on each voltmeter?

34. Four lamps are each labelled 240V. In which circuit do all four lamps have normal brightness?

35. An electron moves into a uniform magnetic field. The arrow shows the initial direction of motion of the electron. The direction of the magnetic field is into the plane of the page (away from you).

In which direction does a force act on the electron when it enters the magnetic field?
A. the page
B. out of the page
C. towards the bottom of the page
D. towards the top of the page

36. The scattering of α-particles by a thin metal foil supports the nuclear model of an atom. Why are α-particles used rather than neutrons?
A. because they always travel more slowly
B. because they are heavier
C. because they are larger in diameter
D. because they have a positive charge

37. A scientist carries out an experiment using a sealed source which emits β particles. The range of the β-particles in the air is about 30cm.
Which precaution is the most effective to protect the scientist from the radiation?
A. handling the source with long tongs
B. keeping the temperature of the source low
C. opening all windows in the laboratory
D. washing his hands before leaving the laboratory

38. The diagram shows an a.c. generator.

As the coil passes through the position shown, the output voltage is +10V.
When does the output voltage become –10V?
A. when the coil has turned through 90°
B. when the coil has turned through 180°
C. when the coil has turned through 270°
D. when the coil has turned through 360°

39. Which row describes the nature of α-particles and of γ-rays?

40. A nucleus of a radioactive substance  21884 Po undergoes an α-decay followed by a β-decay.
What are the nucleon (mass) number and proton (atomic) number of the nuclide formed after both decays have happened?

These questions are provided to Vagupu by Mr. CN Muralinath. Mr. Muralinath is an IIT Alumnus and best tutor for IGCSE Physics and Math. If you want answers of these questions or clarification on any other concept related to IGCSE Physics and Math, feel free to contact him. To contact Mr. Muralinath, click here