SECOND TERM EXAMINATION

Name: Roll number: Date: Grade: Grade KS-3 Marks: 100 Subject: Science Time: 2 Hours

CHEMISTRY

Q-2)

[Total:6]

Q-3)

Q-4)

Q-5)

Q-6)

[3]

Q-7) Answer the following questions:

1. Give two methods of rust prevention.

……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………...............................................[2]

2. Give two uses of Sodium metal.

………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………….............................................…[2]

3. Give the chemical symbol of the following elements.a. Magnesium…………………………………………………………………………………………………………………………b. Nitrogen…………………………………………………………………………………………………………………………….[2]

Biology

Q1. Two school going children are investigated on the daily basis diet. This is what was calculated based on their consumption of food for the day.

Child A Child BFats 20 % 28%Carbohydrates 42% 37%Proteins 18% 21%Minerals 10% 2%vitamins 5% 12%

A. Which child is likely to suffer from rickets? _____________ 1 MarkB. Why is it so? Justify your answer. 2 Marks

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C. Which food items should be included in his diet? 1 Mark________________________________________________________________________________________________________________________________

Q2. Label the diagram. 2 Marks

a. What is the function of the diaphragm? 2 Marks

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Q3. Match the following. 4 Marks

Diseases Causes of diseases

Malaria BacteriaAIDS Anopheles MosquitoTuberculosis STDChlamydia HIV

Q4. What is the correct order for food passing through the digestive system? 1 Mark

a. Stomach – large intestine- small intestineb. Small intestine- stomach-large intestinec. Stomach-small intestine-large intestine

Q5. What is mainly absorbed in the large intestine? 1 Mark

a. Waterb. Digested foodc. Fibre

Q6. What is the addictive substance in tobacco smoke? 1 Mark

a. All drugs are medicineb. Most drugs have no effect on the bodyc. Alcohol and tobacco are legal drugs

Q7. The table gives list of statements concerned with arteries, veins and capillaries. Tick the correct box to indicate which statement applies to which type of blood vessel. 5 Marks

Statement Arteries Veins Capillaries Carry blood at high pressureUsually carry blood with a high oxygen concentration

Allow substance to pass through their walls into cellsHave valvesCarry blood away from organsQ8. The diagram shows the male reproductive system.

a. Name the labelled 3 Marks

3______________ 4___________________ 7_______________

Use the numbers from the diagram to match the following.

a. A structure where male gametes develop. 1 Mark_______________________________________________________

b. Why are testicles present outside the male body? 2 Marks________________________________________________________________________________________________________________________________

Q9. Give two differences between medicinal and non medicinal drugs. 2 Marks

Q9. Answer the following questions.

Complete the word equation for photosynthesis. 1 Mark

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State the source of energy for this reaction. ___________________________________________________ 1 Mark

Name the plant pigment necessary for this reaction. 1 Mark

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Q10. The condition in the stomach is supposed to be acidic. Can you outline one reason to justify the statement? 1 Mark

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Physics

Q.1. (a)

Q.2.

--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- (2)d) If you had a magnet with its north and south poles marked on it and a magnet without its poles marked, how could you identify the poles of the unmarked magnet? Explain your answer. (2)

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Q.3.

c) Why is that a bell is sealed in a bell jar-

i) Can be heard when the jar is full of air? (1)

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ii) Cannot be heard when a vacuum is created in the jar? (1)

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d) i) What is the use of an oscilloscope? (1)

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ii) Write down the units of the following (2)

Frequency___________________________________

Loudness____________________________________

e) Define wavelength (1)

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4. a) What is meant by dispersion of light? (1)

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b) Which colour refract most during dispersion and why? (1)

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5. a) What is meant by velocity? (1)

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b) The speed of two objects are measured by speed trap gun. The results are as following:

Distance travelled in cm Time at first light gate Time at second light gate

50 cm 0.00 10.00s

100cm 0.00 20.00s

a) Find the speed of those two objects in cm/second. (Show working) (2)

b) which one is faster? (1)

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c) A man walks 7 km East in 2 hours and then 2.5 Km west in 1 hour. Find his average speed for the whole journey. (show working) (2)

Q.5.a) Label this diagram, which shows the refraction of light into air.(2)

b) What is the speed of light? (1)

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c) What is the use of periscope? (1)

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