OFFICE OF THE PRESIDENT

REGIONAL ADMINISTRATION AND LOCAL GOVERNMENT

STANDARD FOUR NATIONALASSESSMENT

2019 – SCIENCE ANDTECHNOLOGY

SECTION A

1. Answer items (i) to (v) by choosing the correct the correct answer and writing its letter in the space provided.

(i)Safe food is one which is .........

1. spread with insecticide to killinsects
2. kept in a clean container
3. kept for a short time
4. kept in a place where there islight.

(ii) The following are the preventivemeasures against diseases except

1. closing the mouth whencoughing
2. sleeping in a clean and safeplace
3. drinking clean and safe water
4. washing hands before going tothe toilet

(iii) Which diseases are caused bypollution of water sources?

1. Whooping cough and measles
2. AIDS and cholera
3. Malaria and trachoma
4. Cholera and bilharziasis

(iv) Which of the following is thefunction of saliva in the digestionprocess?

1. To soften food
2. To soften the mouth
3. To soften teeth
4. To soften the tongue

(v) In which part does the digestion offood start in the system?

1. In the stomach.
2. In the oesophagus.
3. In the mouth.
4. In the pancreas.

2. Answer items (i)-(v) by matching the sentences in List A With the states of matter in List B. Write the letter of the correct answer.

3. Answer items (i) (v) by choosing thecorrect word from the box and writing itin the space provided.

heart burnconstipation

kwarshiorkormarasmus

flatulenceteeth decay
stomach ulcers

1. The condition by which a personproduces hard and dry faeces isknown as....
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(ii) The condition which is caused byexcess gas in the stomach is called.....

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(iii) What is the name of the burning pain in the esophagus and chest

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(iv) In the digestive system, the sores or lesions in the stomach wall arecalled

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(v) What effect on teeth may result from eating sugary foods?

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4. Read the following passage and thenanswer items (i) - (v).

Many types of food which we use in ourdaily life are cooked. Food is cookedusing heat energy. The devices usedto facilitate the cooking of our foodare known as cookers. In Tanzania,the types of cookers mostly usedare firewood and charcoal cookers.In recent years, there has been anincrease of the users of gas cookers inthe rural and urban areas. The choiceof type of cooker differs depending on the availability, cost and safety of thetype of fuel used. These are some of thethings to consider when choosing thetype of cooker to use

Questions:

(i) Name two types of cookers mostly used in Tanzania as mentioned inthe passage.

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(ii) What kind of energy is used forcooking?

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(iii) What differentiates the types ofcookers? ......

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4. What do you think is the reasonfor many people to use firewoodcookers?
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5. Name two other cookers apart fromthose mentioned in the passage.
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5. Observe the picture below and then answer items (i)-(v)



(i) What is the name of the objectshown in the picture above?

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(ii) Label the part which carrieselectrical power from the socket byusing letter A

(ii) Label the part which displayspictures by using letter B.

(iii) Label the part that picks up signalsfrom the air by using letter C.

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(iv) Why is the device shown in thepicture above important to us?.....

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