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THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA
CERTIFICATE OF SECONDARY EDUCATION EXAMINATION
Time: 3Hours November, 2016
Answer all questions in this section
1. For each of the items (i) – (x), choose the correct answer among the given alternatives and write its letter beside the item number in the answer booklet provided
(i) The position of the centre of gravity of an object has a significant influence in its
(ii) Which statement explains the basis of heliocentric theory?
(iii) Which among the following is a reason for the sky to appear blue while being observed from the earth?
(iv) The suspended magnetic needle always comes to rest with its axis in a vertical plane called?
(v) The correct arrangement of metals in ascending order of their linear expansivities is?
(vi) The loudness of a note produced by a vibrating object depends on?
(vii) How many number of images will be formed if the angle between two mirrors is 0 ?
(viii) The correct statement about radio waves is that:-
(ix) What is the function of cathode in x – ray tube?
(x) Which of the following circuit elements has ability to produce gain as used in electronics?
2. Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
3. For each of the items (i) –(x), fill in the blank spaces by writing the correct answer in the answer booklet provided.
SECTION B (60) Marks)
Answer all questions in this section.
4. (a) (i) Define turning effect of force and give its SI unit.
(ii) How the moment of force can be increased considerably in practical life? Give two examples.
(b) (i) List two factors that affect stability of a body
(ii) Briefly explain why the handle of a door is near its outside edge?
(c) (i) What is meant by a balanced beam?
(ii) A uniform rod AB of mass 6.0 g is balanced horizontally about a knife edge at a distance of 3cm from end A w here a mass of 8.0 g is hanging. Find the length of the rod.
5. (a) (i) State the law of inertia
(ii) Use the law in (a) (i) to define force.
(b) A ticker – tape is moved through a ticker – timer for 5.0 seconds. If the timer is operating at 25 Hz:
(c) A shell of mass 30kg is fired at a velocity of 600ms-1 from a gun of mass 7000kg.
6. (a) (i) Distinguish between light spectrum and dispersion of light.
(ii) Briefly describe how a light ray passes through an equilateral glass prism.
(b) Study Figure 1 which represents three primary colours combines together and answer the questions that follow.
7. (a) What is meant by the terms
(b) Briefly explain on the following observations:
(c) (i) Define latent heat of fusion of a substance
(ii) A copper block of mass 0.68 kg is suspended in a freezing mixture at - 50 for some time and then transferred to a large volume of water at 0 . Calculate the mass of ice formed.
8. (a) (i) Distinguish between primary and secondary cells, giving one example of each.
(ii) Identify two defects of a simple cell.
(b) (i) Explain why lead – acid accumulators are used in car batteries rather than dry cells?
(ii) A cell of unknown e.m.f, E and internal resistance 2? is connected to a 5? resistance. If the terminal p.d, V is 1.0V. Calculate the e.m.f, E of a cell.
(c) (i) List two devices that are important when checking electrical faults in domestic appliances.
(ii) Briefly explain why a very high voltage is necessary when transmitting electrical energy from power station?
9. (a) (i) What s Zodiacal light?
(ii) Mention three uses of earth satellite.
(b) (i) Give two examples of a Jovial planet and two examples of terrestrial planet.
(ii) How are the bodies in the solar system kept in normal positions?
(c) (i) Which planet is often called “Morning star”?
(ii) Briefly explain how astronomy gave rise to the 12 months of the year
SECTION C (10 Marks)
Answer one (1) question from this section.
10. (a) (i) What is meant by radioactive element?
(ii) Name three instruments which are used to detect radiation from radioactive source.
(b) Figure 2 shows the deflection of radiations from a radioactive element by an electric field.
(c) (i) What are radioisotopes?
(ii) State two important applications of radioisotopes.
11. (a) (i) State the purpose of dynamo
(ii) How can an a.c dynamo be converted to a d.c dynamo.
(b) (i) Briefly explain why an e.m.f is induced in the coil as it rotates.
(ii) At what position of the coil in 11 (b) (i) is the induced e.m.f zero?
(c) Explain the function of each of the following features of a simple electric motor.
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