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  2006/10/13 a.m.

Instructions

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

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

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

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

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

6. Whenever necessary use the following constants:

Acceleration due to gravity g = 9.8 m/s²

Specific heat capacity of water Cw = 4200 J/kg K

SECTION A (20 Marks)

Answer all questions in this section.

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) Metals conduct heat better than non­metals because:

1. metals are good conductors of electricity
2. metals have free electrons while non­metals have not
3. molecules of metals have higher velocity than that of non­metals
4. metals are normally of high specific heat capacity
5. the crystalline structure of metals is more compact than that of non­metals.

(ii) A metre rule is pivoted at point A as illustrated by the diagram below and balanced by a force of 2.5 N.

Figure 1

The mass of the metre rule in kilogram is given by:

1. 0.15 
2. 2.50 
3. 0.10 
4. 0.25 
5. 1.50

(iii) Which of the following will not affect the rate of evaporation of water in a dam?

1. Surface area 
2. Depth
3. Humidity
4. Barometric pressure
5. Temperature.

(iv) Aluminium has a specific heat capacity more than twice that of copper. Identical masses of aluminium and copper, both at 0°C are dropped together into a can of hot water. When the system has come to equilibrium

1. aluminium is at a higher temperature than copper
2. aluminium and copper are at the same temperature
3. copper is at a higher temperature than aluminium
4. temperature difference between the copper and aluminium depends on the amount of water in the can
5. the temperatures of the copper and aluminium will be higher than that of water.

(v) In the diagram below (fig. 2) a beam of white light entering a triangular glass prism is refracted and dispersion of colour occurs.

Figure 2

A thermometer placed at Y records a rise in temperature from the radiation produced. The correct name for this radiation is

1. ultra violet 
2. x-­rays 
3. gamma rays
4. infra­red 
5. beta particles

(vi) A wire of uniform cross­sectional area has a length of 10 m, a resistance of 2 ? and a resistivity of 2 x 10^­-7?m. The cross sectional area in m² is:-

1. 2 x 10^-4
2. 1 x 10^-5
3. 0.5 x 10^­-5
4. 1 x 10^-6
5. 5 x 10^-4

(vii) When the plastic pen is rubbed against dry hair, the pen attracts small pieces of paper. This means that the:

1. hair becomes negatively charged
2. hair becomes positively charged
3. pen loses electrons
4. hair gains electrons
5. paper loses electrons.

(viii) Electric pressure is measured in

1. current
2. volts 
3. watts
4. ampere
5. force.

(ix) In the circuit diagram below (fig. 3) A, B, C and D are just positions and the switch is closed.

Fig. 3

Choose the correct statement.

1. The current at A will be different from the current at B
2. The two lamps are wired in parallel
3. The current reaches B before it reaches C
4. With an extra lamp at D the current will be low
5. With an extra lamp at A the batteries will run down immediately.

(x) The property which distinguishes longitudinal waves from transverse waves is the

1. ability to be refracted
2. need for a material medium
3. relative directions of oscillations and propagation
4. wavelength
5. the speed of propagation.