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CSEE

Physics · Paper 1 · 2017

20 questions 🇹🇿 NECTA

CSEE 🇹🇿 NECTA

Physics · Paper 1 · 2017

20 questions

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Questions (20)

Section A

1. 1 mark

A gas of volume 900 cm3 at 27°C when warmed at constant pressure to 87°C will occupy a new volume of

A. 900 cm3

B. 720 cm3

C. 1080 cm3

D. 540 cm3

E. 727 cm3

5. 1 mark

The device which operates under the principle of total internal reflection of light is called

A. magnifying lens.

B. plan mirror

C. telescope.

D. optical fibre.

E. pin-hole camera.

6. 1 mark

If 120 volts are used to light a 30-watt light bulb, what will be the current flowing through that bulb?

A. 40 A

B. 30 A

C. 0.25 A

D. 4 A

E. 0.30 A

7. 1 mark

When a lead-acid accumulator is freshly made it has an electromotive force (e.m.f) of

A. 1.5 V

B. 1.25 V

C. 2 V

D. 3 V

E. 1 V

8. 1 mark

Which among the following radiations can be absorbed by a metal plate?

A. Alpha ($\alpha$) particle.

B. Gamma ($\gamma$) rays.

C. Beta ($\beta$) particle.

D. X-rays.

E. Cathode rays.

Section B

3. 10 marks

For each of the items (i)-(x), fill in the blank spaces by writing the correct answer in the answer booklet provided. (i) The velocity of the body as noted by a non-stationary observer is called ___________ (ii) Which method of heat transfer does not involve the actual movement of particles from their mena position? ___________ (iii) What name is given to the angle of incidence when the angle of reflection is 90°? ___________ (iv) A temperature at which solids change to liquids at constant temperature is referred to as ____________. (v) Colours which when mixed in a definite ratio yield white colour are known as ____________. (vi) Which type of a resistor is used to convert moving coil galvanometer into voltmeter? ____________. (vii) Cathode ray tube is used in the production of ____________. (viii) A group of stars that forms a definite shape or pattern when viewed from the earth is called ___________ (ix) Which rule summarizes the relation of force, current and the field being mutually perpendicular to each other? ____________. (x) Which region in electromagnetic spectrum has lowest frequency? ____________.

(i) The velocity of the body as noted by a non-stationary observer is called 1 mk

(ii) Which method of heat transfer does not involve the actual movement of particles from their mena position? 1 mk

(iii) What name is given to the angle of incidence when the angle of reflection is 90°? 1 mk

(iv) A temperature at which solids change to liquids at constant temperature is referred to as 1 mk

(v) Colours which when mixed in a definite ratio yield white colour are known as 1 mk

(vi) Which type of a resistor is used to convert moving coil galvanometer into voltmeter? 1 mk

(vii) Cathode ray tube is used in the production of 1 mk

((viii) A group of stars that forms a definite shape or pattern when viewed from the earth is called 1 mk

(ix) Which rule summarizes the relation of force, current and the field being mutually perpendicular to each other? 1 mk

(x) Which region in electromagnetic spectrum has lowest frequency? 1 mk

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4. 0 marks

Answer all questions in this section.

(a) Mention four applications of thermal expansion of solids. 4 mk

(b) Briefly explain why holes are left below the chimneys of kerosene lamp or kitchen. 3 mk

(c) A steel tyre of diameter 150 cm at 10°C is to be fitted on to a train wheel of diameter 151 cm. What temperature must the tyre be heated to just fit the wheel? 3 mk

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9. 5 marks

(none) Which rule summarizes the relation of force, current and the field being mutually perpendicular to each other? 0 mk

(i) Frequency of the wave. 2 mk

((a)(i) Illustrate how the right hand grip rule is used to determine electric current and magnetic field directions. 3 mk

(ii) Velocity of the wave. 3 mk

((b)(i) Briefly explain how simple a.c dynamo can be converted to simple d.c dynamo. 3 mk

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Section C

10. 10 marks

(none) Which region in electromagnetic spectrum has lowest frequency? 0 mk

((a)(i) How do intrinsic semiconductors differ from extrinsic semiconductors? 3 mk

((b)(i) Describe how x-ray tube is used to produce x-rays. 3 mk

((c)(i) Briefly explain the working principle of a bicycle dynamo. 2 mk

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11. 10 marks

(a) How does the increase of length and cross-section area of a conductor affect its resistance? 3 mk

((b)(i) Determine the ratio of resistance of wire A to that of wire B which are made up of the same material such that wire A has half the length and twice the diameter of wire B. 3 mk

((c)(i) How long will the kettle take to raise the temperature of 2 kg of water at 30°C to its boiling point? 2 mk

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