PT3

Answer all the questions.

1. The following diagram shows the three states of matter.

a) Write solid, liquid or gas to label each part in the above diagram. [3 marks]

b) Matter can change from one state to another. The diagram below shows three changes of state of matter. Match the changes of state of matter with the occurrences that take place in everyday life. [3 marks]

P: Q: R:

2. The diagram below shows water is heated by using a pot. Write conduction, convection or radiation to label each method of transfer or heat that occurs in the diagram below. [3 marks]

b) A student carried out an experiment to study a type of transfer of heat. The diagram below shows the apparatus set up by the student. The temperatures of the thermometers are recorded after 5 minutes.

You are given three temperatures. Write in the boxes provided in the diagram above the temperatures recorded by thermometers A, B and C at the end of the experiment. [3 marks]

42℃ 95℃ 56℃

3. a) The diagram below shows a climber climbing a hill. [2 marks]

i) Name two forces that help the climber move upwards. [2 marks]

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ii) State two uses of the forces state in (a) (i) in our everyday lives. [2 marks]

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b) The diagram below shows a car moving at high speed.

i) What will happen to the tread or surface of the tyre when the driver brakes suddenly? [1 mark]

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ii) State one advantage of using tyres with thick tread. [1 mark]

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4. The food pyramid is used as a guide in the preparation of healthy meals. Consuming healthy foods ensure the body to receive all the nutrients sufficiently. The intake of food must be varied because no single food can supply all the nutrients needed by the body.

a) What is the importance of a balanced diet? [2 marks]

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b) i) What is the function of class R? [1 marks]

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ii) What will happen to a person with a deficiency of food from class R? [1 mark]

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c) The diagram below shows a child facing the problem of obesity.

Why is obesity not desirable for health? [1 mark]

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5. The diagram below shows parts of the human body.

a) In the diagram above, tick (/) the correct letters to show the excretory organs involved in excretion. [3 marks]

b) Tick (/) the correct functions of the part labelled T.

i) Filters waste from the blood.ii) Stores urine.iii) Regulates the water content in the body.iv) Removes urea.

c) The diagram below shows a section through the human kidney.

Tick (/) one difference in characteristics between the parts labelled X and Y.

i) X is a pale-red region while Y is a dark red region.ii) X absorbs water while Y absorbs glucose.

6.a) Match the types of interaction between the organisms involved. [3 marks]

b) Match the words with their meanings in a food web. [3 marks]

MeaningsGreen plants that can make their own food by converting sunlight energy into chemical energy during photosynthesis.

Bacteria and fungi which break down dead organisms into nutrients and simpler substances.

Animals which feed on plants directly or indirectly.

7. a) A bus and a racing car are different in height. Thus the position of the centres of gravity of the vehiches are different.

Mark the centres of gravity ( cg) of the two vehicles. [2 marks]

b) A bus and a racing car are placed on an inclined platform. The bus becomes unstable and overturns. The racing car is still stable and does not overturn.

i) Based on the information provided, state the factors that influence the stability of a vehicle. [3 marks]

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ii) Suggest one another factor that makes a racing car more stable than a bus. [1 mark]

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