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 Monday, 09^th November 2015 a.m.

Instructions

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

2.  Answer all questions in sections A and B and one (1) question from section C.

3.  Calculators and cellular phones are not allowed in the examination room.

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

5.  Where necessary the following constants may be used:

(i)  Acceleration due to gravity, g = 10 m/s²

(ii)  Density of water = 1.0 g/cm³

(iii)  Linear expansivity of iron = 1.24×10^­5­1K

(iv)  Specific latent heat of fusion of ice = 336 J/g

(v)  Velocity of sound in air = 340 m/s

(vi)  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 beside the item number in the answer booklet provided.

(i) A spiral spring of natural length 1.50m is extended to 1.505m by a force of 0.80N What will be its extension when the applied force is 3.20N?

1.  0.005m 
2.  6.020m 
3.  0.020m
4.  4.520m 
5.  1.57.

(ii) Which of the following electromagnetic waves is used to detect flaws and defects in steel plates?

1.  infrared waves 
2.  ultraviolet waves 
3.  x­-rays
4.  gamma rays 
5.  micro waves.

(iii) A part of human eye that corresponds to the film in a camera is called

1.  cornea 
2.  iris 
3.  lens
4.  pupil 
5.  retina.

(iv) The sun generates its energy by a process called

1.  thermonuclear fission 
2.  thermonuclear fusion
3.  geothermal energy 
4.  geothermal fusion
5.  geothermal fission.

(v) What will be the size of the image formed if an object 4cm tall is placed 20cm in front

 of a concave mirror of focal length 15cm?

1.  60cm 
2.  40cm 
3.  24cm
4.  12cm 
5.  3cm.

(vi) What is the main function of step up transformer?

1.  To change a.c to d.c current 
2.  To decrease resistance in a circuit
3.  To increase a.c voltage 
4.  To decrease a.c voltage
5.  To increase a.c current.

(vii) The most probable radiation forming a well­defined track when passed in a cloud chamber is called

1.  gamma­rays 
2.  beta rays 
3.  cathode rays
4.  alpha rays 
5. E x­-rays.

(viii) The effect of adding an acceptor impurity to a silicon produce a crystal called

1.  P­type 
2.  N­type 
3.  PN­type
4.  NP­type 
5.  PNP­type.

(ix) Colours are produced when white light passes through glass prism because

1.  light waves interfere
2.  glass prism colours the light
3.  in glass different colours travel at different speeds
4.  different colours are filtered
5.  diffraction of light occurs.

(x) Which of the following statements is true when the resistance, R, of a wire is measured using an ammeter, voltmeter and rheostat?

1.  the ammeter is in parallel with R
2.  the voltmeter is in series with R
3.  a graph of V against I has a gradient equal to R
4.  a graph of I against V has a gradient equal to R
5. the rheostat is in parallel with R.