THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATIONS COUNCIL

CERTIFICATE OF SECONDARY EDUCATION EXAMINATION

031/1 PHYSICS1

(For Both School and Private Candidates)

Time:3Hours Monday, 11^th November 2013a.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:

   1. Acceleration due to gravity, g = 10 N/kg or 10 m/s²

   2. Density of air = 1.2 kg/m³

   3. Density of mercury = 13200 kg/m³

   4. Density of water = 1000 kg/m³

   5. Linear expansivity of steel = 11 x 10^-6 K^-1

   6. 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.

(i) Tow forces of 5 N and 8 N are acting at the same point and are inclined at an angle of 45° to each other. What will be their resultant force?

1. 11.2 N
2. 12 N
3. 22.4
4. 1.2 N
5. 1.12 N

(ii) Which of the following are good examples of ferromagnetic materials?

1. iron and ceramic
2. zinc and iron
3. copper and nickel
4. nickel and cobalt
5. obalt and ceramic

(iii) A white shawl wrapped around a baby keeps the baby warm because the shawl

1. is a poor reflector
2. is a poor radiator
3. has pockets of air trapped in
4. conducts heat to the baby
5. stops convection currents.

(iv) A body is said to be in equilibrium IF

1. it moves with uniform speed
2. the net force acting on it is zero
3. the upward and downward forces are equal
4. its centre of gravity is low positioned
5. its centre of gravity is high.

(v) The correct statements about sound waves is that they

1. are transverse waves
2. can travel in vacuum
3. can be polarized
4. cannot be polarized
5. do not require medium.

(vi) In order to produce electrons in a discharge tube the

1. anode should be at a higher potential than the cathode
2. potential difference at the anode should be low
3. cathode should be heated indirectly at low voltage supply
4. electrodes should be at the same potential
5. electrons must be accelerated at higher potential.

(vii) The battery in the circuit shown in the following diagram has an e.m.f. of 2 V and negligible internal resistance.

What will be the current flowing in the 6 ? resistor?

1.  0.15 A
2. 0.64 A
3. 1.42 A
4. 0.10 A
5. 0.33 A

(viii) The image formed by plane mirrors are always

1. real, magnified and laterally inverted
2. virtual, laterally inverted and same in size
3. magnified, virtual and erect
4. laterally inverted, same in size and real
5. erect, real and magnified.

(ix) Which of the following particles is used to cause fission in an atomic reaction?

1. proton
2. deuteron
3. neutron
4. beta-particle
5. alpha-particle

(x) The layer in the atmosphere where weather phenomena are formed is called

1. stratosphere
2. magnetosphere
3. thermosphere
4. troposphere
5. exosphere.