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, 10th November 2014 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 or 10 N/kg

(ii) Electronic charge, e = -1.602x10-19 C

(iii) Refractive index of water = 4/3

(iv) Pi, π = 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) What physical phenomenon is observed when a tea bag is dipped into a cup containing hot water?

1.  Surface tension
2.  Capillary then diffusion
3.  Diffusion
4.  Osmosis then diffusion 
5.  Osmosis only. 

(ii) When a gas is compressed at constant temperature, the gas molecules

1.  move faster than air outside and the pressure is increased
2.  move with uniform speed and the pressure is unchanged
3.  gain more kinetic energy and the pressure is decreased
4.  increase slightly in size and its pressure remains constant
5. make more impacts per second on the walls of the container.

(iii) A car moving at steady speed has a frictional force on its surface whose size depends on its

1.  speed and surface area
2.  speed
3.  surface area
4.  weight 
5.  wheels speed. 

(iv) When illuminated by a certain lamp, the shadow of a table-tennis ball on a white screen is uniformly dark. This is because the lamp used is

1.  very bright
2.  fluorescent
3.  very small 
4. very weak
5. very large. 

(v) In a black and white television, the image is formed on the screen by:

1. varying the intensity or brightness of the electron beam
2.  adjusting the number of stations using a remote control
3.  limiting the flow of electrons between the cathode and anode
4.  increasing the grid’s voltage to its maximum value
5.  adjusting the antenna to capture waves of short wavelength. 

(vi) A green card with red flowers when viewed in a red light will appear:

1.  completely red
2.  completely yellow
3.  completely green 
4.  yellow with red flowers 
5.  green with red flowers. 

(vii) Figure 1 shows a pattern of waves in a ripple tank traveling from part X to part Y across a plane section Z.

Figure 1

What observation can be made from Figure 1?

1.  the total reflection occurs at Z
2.  the wavelength in part X is greater than that in part Y
3.  the wave speed v1 in part X is less than v2 in part Y
4.  diffraction occurs across Z
5.  The wave changes in frequency as it crosses Z. 

(viii) A solid metal cube has each side doubled to make a solid cube of the same metal eight times bigger in volume. The ration of resistivity of the new cube to resistivity of the old cube is

1.  8:1
2.  6:1
3.  1:1
4.  1:6
5.  1:8 

(ix) In a cloud chamber, straight-line trails of vapour are produced by a source emitting:

1. beta-particles
2. gamma-rays
3. electrons
4.  alpha-particles 
5. light rays. 

(x) Which of the following is the correct weight of a body of mass 48 g when placed on the moon surface?

1.  0.48 N 
2.  4.8 N
3.  0.80 N
4.  0.048 N
5.  80.0 N.