THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION 031/1 PHYSICS 1 

(For Both School and Private Candidates)

Time: 3 Hours Friday, October 14, 2005 a.m.

Instructions

1. This paper consists of sections A, B and C.

2. Answer all questions in sections A and B and two (2) questions from section C.

3. Electronic calculators are not allowed in the examination room.

4. Cellular phones are not allowed in the examination room.

5. Write your Examination Number on every page of your answer booklet(s).

6. Where necessary use the following constants:

Acceleration do to gravity g = 9.8 m/s².

Coefficient of linear expansion of brass = 0.000019/°C.

Coefficient of linear expansion of iron = 0.000012/°C. Pi π = 22/7

SECTION A (20 marks)

Answer all questions

1.For each of the items (i) - (x) choose the correct answer from among the given alternatives and write its letter beside the item number.

(i)An auto mechanic wants to measure the diameter of a wire to the nearest 0.001 cm. Which of the following instruments can be used?

1. Vernier caliper
2. Micrometer screw gauge
3. Metre rule
4. Pair of compasses
5. Engineer's calipers.

(ii)The mass of 1.5 litres of water is ___________ kg.

1. 1500
2. 150
3. 15
4. 1.5
5. 0.15

(iii)A rectangular wooden block of density 0.8 g/cm³ has dimensions 0.5 m x 0.8 m x 6 m. What maximum pressure will it exert on the ground? ________________ N/m².

1. 48,000
2. 4,000
3. 2.4
4. 19,200
5. 400

(iv)Land and sea breezes, ventilation of rooms and cooling systems of refrigerators and deep freezers are associated with one of the following processes of heat transfer

1. conduction
2. evaporation
3. radiation
4. expansion
5. convection.

(v)A blue dress with red spots when viewed in red light will appear

1. completely red
2. completely magenta
3. blue with red spots
4. magenta with red spots 
5. black with red spots.

(vi) A lens is used to form an image of a bright object on a screen. The effect of covering the top half of the lens with a card is to

1. make the image less bright 
2. make the image go out of focus
3. make the image disappear 
4. remove the top half of the image
5. remove the bottom half of the image.

(vii) The size of the induced current in a dynamo depends on the following except

1. strength of the magnet 
2. shape of the magnet 
3. pressure in the dynamo 
4. speed of rotation of the coil 
5. number of turns in the coil.

(viii) A horizontal electron beam passes between two parallel horizontal plates X and Y with X above Y. When a high tension battery is connected with its -ve pole to x and +ve pole to Y, the beam is deflected

1. upwards 
2. downwards at 45° to the horizontal
3. upwards at 45° to the horizontal
4. sideways
5. downwards.

(ix) Which of the following can be common to α-particles, β-particles and γ-rays?

1. possess electric charges
2. can be deflected by magnetic fields
3. can be deflected by electric fields 
4. can ionize the air
5. can be absorbed completely by a very thin aluminum foil.

(x) A transistor in figure 1 is connected in the common-emitter mode. What should be the sign of the potentials at point 1, 2 and 3?

Fig.  1