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CSEE

Physics · Paper 1 · 2012

24 questions 🇹🇿 NECTA

CSEE 🇹🇿 NECTA

Physics · Paper 1 · 2012

24 questions

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Questions (24)

Section A

1. 1 mark

The interior structure of the Earth is composed of three major zones which are:

A. magma, mantle and the core

B. lava, crust and magma

C. hypocenter, crust and the mantle

D. the core, lava and hypocenter

E. crust, mantle and the core.

2. 10 marks

Match the items in List A with responses in List B by writing the letter of the correct response beside the item number. List A (i) The motion of a body through equal distances in equal times (ii) Displacement per unit time (iii) Area under velocity-time graph (iv) The rate at which an object travels (v) Constant displacement along the road in equal times (vi) The gradient of displacement-time graph (vii) Uniform accelerated motion of a body (viii) The rate of decrease of constant velocity (ix) A measure of how far a body is from a starting point (x) The gradient of velocity-time graph List B A. Uniform deceleration B. Displacement C. Resultant velocity D. Uniform speed E. Average velocity F. Straight line graph G. Speed H. Average acceleration I. Uniform velocity J. Distance K. Retardation L. Non-uniform velocity M. Velocity N. Instantaneous velocity O. Constant velocity

(i) The motion of a body through equal distances in equal times 1 mk

(ii) Displacement per unit time 1 mk

(iii) Area under velocity-time graph 1 mk

(iv) The rate at which an object travels 1 mk

(v) Constant displacement along the road in equal times 1 mk

(vi) The gradient of displacement-time graph 1 mk

(vii) Uniform accelerated motion of a body 1 mk

((viii) The rate of decrease of constant velocity 1 mk

(ix) A measure of how far a body is from a starting point 1 mk

(x) The gradient of velocity-time graph 1 mk

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6. 0 marks

(a) (i) Explain how a gas exerts pressure on the walls of its container. (ii) Give reason why it is not sensible to rub the canvas of a tent in wet weather. 0 mk

(b) Explain two situations in which the phenomenon of surface tension is exhibited. 0 mk

(c) An oil drop of volume 10-9 m3 spreads out on water to form a film of area 0.2 m2. (i) estimate the length of an oil drop. (ii) what assumption have you made in calculating part (c) (i) above. 0 mk

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7. 0 marks

(a) (i) Differentiate between resistance and resistivity of a given conductor. (ii) Is it possible for two cells in parallel arrangement to drive more current through a resistor than one cell? Give reason. 0 mk

(b) (i) What is ‘1 KILOWATT-HOUR’ as applied to current electricity? (ii) If you find a domestic electric bulb rated 60 W, 240 V what does this mean? 0 mk

(c) Find the cost of running five 60 W lamps and for 100 W lamps for 8 hours if electric energy costs Tshs. 27/= per unit. 0 mk

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8. 0 marks

(a) What is meant by the following terms: (i) global warming. (ii) greenhouse effect. (iii) earthquake. 0 mk

(b) Mention three effects of global warming. 0 mk

(c) (i) What is the major cause of global warming? (ii) Briefly explain three measures that can be taken to control global warming. 0 mk

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9. 0 marks

(a) Define the following terms: (i) binding energy. (ii) thermonuclear fusion. 0 mk

(b) (i) What is meant by background count? Give two sources of radiations always present in a neighbourhood of a detector. (ii) How does the rate of escape of electrons from a metal relate to its temperature? (iii) A sample containing 400 g of iodine-131 has a half-life of 8 days. How much of the sample will remain undecayed after 40 days? 0 mk

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Section B

4. 7 marks

An ordinary hydrometer of mass 27 g floats with 4 cm of its stem out of water. If the cross sectional area of the stem is 0.75 cm$^2$ calculate:

((b)(i) the relative density of the liquid. 4 mk

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Section C

0. 10 marks

A radioactive material is denoted by the symbol ${}_{88}^{220}X$. Write down the composition of the nucleus during the end of the following stages of disintegration. Figure 2 shows a common-emitter amplifier circuit.

((c)(i) Explain the function of capacitors C and C . 1 mk

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10. 10 marks

((a)(i) Mention two applications of transistors. 1 mk

((b)(i) Briefly explain the mode of action of a forward bias in a p-n junction. 1 mk

((c)(i) Explain the function of capacitors C and C . 1 mk

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