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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, 09th November 2018 a.m.
(i)Acceleration due to gravity, g = 10 m/s2 or 10 N/kg
(ii)Specific heat capacity of mercury is 1395 J/kg°C
(iii) 1g of water is equivalent to 1 cm3
(iv) Pi = 3.14.
SECTION A (30 Marks)
Answer all questions in this section.
1. For each of the items (i) - (x), choose the correct answer among the given alternatives and write its letter besides the item number in the answer booklet provided.
(i)The correct formula to find the elastic force constant (k) of a spring is
(ii) Why is oil used as a lubricant?
(iii)Which one is a characteristic of a plane mirror?
(iv) Which one is not a region of electromagnetic spectrum?
(v) What quantity of heat is required to raise the temperature of 25 kg sample of mercury from 20°C to 30°C?
(vi)When silicon element is doped with phosphorus atoms, it produces
(vii) Which of the following is an example of a scalar quantity?
(viii)What role does the iris play in the human eye?
(ix) Asteroids which manage to reach the earth surface are called
(x) What will be the resistivity of a wire 2 metres long with a cross-sectional area of 0.50 mm2 and a resistance of 2.20?
2.Match the items in List A with responses in List B by writing the letter of the correct response beside the item number in the answer booklet provided.
(i)Materials that can strongly be magnetized.
(ii)Substance which are made up of soft iron.
(iii)Materials that cannot be affected by magnets.
(iv) Objects which are made up of steel.
(v) Groups of magnetic dipoles arranged themselves in a magnetized object.
(vi) Field lines of force used for finding locations of different places.
(vii) The process of aligning the domains of atoms in one direction.
(viii) The process of destroying the alignment in a magnetized material.
(ix) Materials that can redirect field lines of force.
(x) The region around a magnet in which magnetic materials are attracted.
3. For each of the items (i)-(x), fill in the blank spaces by writing the correct answer in your answer booklet.
(i) The ratio of distance moved by effort to the distance moved by load is referred to as ___________.
(ii) The name given to the heat which is required to raise the temperature of a body by 1 K is ___________.
(iii) The work done when a force of 1 N moves a distance of 1 m in the direction of force is called ___________.
(iv) When a p-type and n-type semiconductors are bounded together they form a single crystal called ____________.
(v) The nuclear reaction which involves joining of lighter nuclei into heavier nucleus is called ____________.
(vi) A device which produces electricity on the basis of electromagnetic induction is called ____________.
(vii) A collision during which the kinetic energy changes is known as ____________.
(viii) The particles in the nucleus of an atom which carry no charge are called ___________.
(ix)The wave which makes particles of the medium to vibrate in a direction perpendicular to the direction of movement of the wave is called ____________.
(x) The sun looks bigger and hotter than other stars because it is near to the _________
SECTION B (60 Marks)
4. (a) Briefly explain why hydrometer
(i) is weighed with lead shots.
(ii) has a narrow stem.
(b) A piece of rubber of volume 100 cm3 and the density of 0.45 g/cm3 floats in water. Calculate:
(i) The volume of rubber that partially immersed in water.
(ii) The force required to immerse the rubber completely.
5. (a) List four factors which affect the rate of evaporation of liquids.
(b) (i) Define relative humidity.
(ii) Calculate the relative humidity given that the reading on dry bulb hydrometer is 24°C and the wet bulb temperature reading is 16°C.
(c) With the aid of a sketched graph, explain how temperature affects the saturated vapour pressure of water.
6. (a) Define the following terms as used in sound waves:
(b) Why notes of the same pitch played on a violin and flute has different quality?
(c) A string of length 75 cm has a mass of 8.2 g. If the tension in the string is 18 N, calculate the frequency of the first and third harmonics.
7. (a) What is meant by radioactive decay?
(b) A certain sample with half-life of 8 days contains 16 g of iodine 131.
(i) Write an expression to show the decay process of the sample.
(ii) Use an expression in (b) (i) to sketch the graph then estimate the mass of sample which will remain undecayed after 20 days.
(c) Describe the use of Geiger-Muller (G-M) tube in detecting nuclear radiations.
8. (a) Give two examples which illustrate the rectilinear propagation of light.
(b) (i) The refractive index of light passing from water to air is 3/4. Calculate the critical angle. (ii) Outline two differences between primary and secondary rainbows.
(c) In Figure 1, identify the names of colours labeled A, B, C, D, E, F and G.
9. (a) (i) Define the term astronomy.
(ii)Enumerate three importance of astronomy to mankind.
(b) (i) Specify the difference that exists between galaxy and a planet. (ii) Outline three defining characters of a planet.
(c) Briefly explain the importance of stratosphere to living things on the earth’s surface.
10. (a) State the following rules:
(i) Cork screw rule.
(ii) Dynamo rule.
(b) (i) Give one structural difference between A.C. and D.C. generators.
(ii) Mention one application of induction coil.
(c) Figure 2 shows a transformer used to step down power. Assuming that there are no power losses, what will be the ammeter reading on the output part?
11. (a) (i) What is meant by the term thermal expansion?
(ii) Mention two applications of thermal expansion of solids.
(b) (i) List three areas where bimetallic strips are used.
(ii) Why a bimetal strip made of brass and invar is curved outside with brass?
(c) Describe how simple fire alarm system operates.
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