THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL OF TANZANIA 

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS 1

(For Both School and Private Candidates)

Time: 3 Hours Year: 2023

Instructions

1. This paper consists of sections A, B and C with a total of eleven (11) questions.
2. Answer all questions in sections A and B and two (2) questions from section C.
3. Communication devices and any unauthorized materials are not allowed in the
   examination room.
4. Non-programmable calculators and mathematical tables may be used.
5. Write your Examination Number on every page of your answer booklet(s).
6. Where necessary the following constants may be used:

1. Acceleration due to gravity, g = 10 m/s².
2. Linear expansivity of aluminium = 0.00003 per ^°C.
3. Linear expansivity of steel = 0.00001 per ^°C.
4. Pie, π = 3.14.

SECTION A (16 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 in the answer booklet provided, (10 marks)

(i)  A study that deals with constellation, solar system and cosmos is referred to as 

1. Electromagnetism 
2. Structure and properties of matter
3. Light 
4. Astronomy
5. Geophysics

(ii) Which of the following burning medium requires a carbon dioxide extinguisher?

1. Organic solids 
2. Flammable liquids and greases
3. Flammable gases 
4. Combustible metals
5. Electrical hazards

(iii) The initial volume of a liquid in a burette was 57 cm³. If X cm³ of the liquid was poured out of the burette and the final volume of the liquid remaining was 23 cm³, calculate the value of X.

1. 80 cm³ 
2. 50 cm³ 
3. 34 cm³ 
4. 46 cm³ 
5. -46 cm³

(iv) Classify the force experienced when a metal solid or a hard object is twisted.

1. Compression 
2. Stretching
3. Restoring 
4. Torsion
5. Friction

(v) Calculate the relative density of an object that weighs 3.5 N when in air and 2.8 N when fully immersed in water.

1. 0.8 
2. 6.4 
3. 5.0 
4. 0.22 
5. 3.5

(vi) Why can water striders and pond skaters walk on water without sinking? 

1. Because of the process of osmosis
2. Because of the property of capillarity
3. Because of the presence of impurities in water
4. Because of the force of surface tension
5. Because of the force of cohesion and adhesion.

(vii) Identify the statement that describes the Pascal's Principle of transmission of pressure in fluids.

1. Pressure is equally transmitted in liquid.
2. Pressure is the ratio of force to area.
3. Pressure depends on the height of the liquid column.
4. Pressure is affected by the force of gravity.
5. Pressure produces upthrust.

(viii) Suppose an engine raises 200 kg of water steadily through a height of 60 m in 20 sec. The upward force used is equal to the weight of water raised. Calculate the power in kW.

1. 6 kW 
2. 3 kW 
3. 5 kW 
4. 7 kW 
5. 4 kW

(ix) The following statements about magnetic lines of force are correct except:

1. Always form close loops.
2. Start at north pole and end at the south pole. 
3. Cross one another.
4. Stronger where the lines are closer together.
5. Pass through all materials, both magnetic and non-magnetic.

(x) What is the distance and displacement covered by an athlete who runs 100 m to the North, 70 m to the East, 100 m to the South and 70 m to the West to complete the race?

1. Distance is 0 m and displacement is 340 m
2. Distance is 340 m and displacement is 0 m
3. Distance is 340 m and displacement is 340 m
4. Distance is 0 m and displacement is 0 m
5. Distance is 700 m and displacement is 700m