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    Friday, 08^th November 2019 a.m.

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.  Cellular phones and any unauthorised materials are not allowed in the examination room.
4.  Non-programmable calculators 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/s ²
2. Density of water = I .0 g/cm ³ 
3. Pie= 3.14.
4.  Coefficient of linear expansivity of the brick 1.2 x 10 ^-5 K ^-1
5.  Speed of light in air = 3 x 10⁸ m/s. 
6. Speed of sound in air = 340 m/s.

SECTION A (15 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.

(i) Which pairs of instruments would you use to correctly measure the diameter of a small ball bearing?

1.  Measuring tape and vernier caliper
2.  Slide rule and micrometer screw gauge
3.  Vernier caliper and slide rule
4.  Micrometer screw gauge and vernier caliper
5. Metre rule and micrometer screw gauge

(ii) A piece of a cork of volume 100 cm ³ is floating on the surface of water. If the density of the cork is 0.25 g cm ^-3 , what volume of the cork is immersed in the water?

1. 100 cm ^-3
2. 0.25 cm ³
3. 25 cm ³
4. 100.25 cm ³
5. 0.025 cm ³

(iii) A layer of colorless water floating on a blue copper (Il) sulphate solution becomes blue after sometime. Which physical process supports the observation made?

1. Diffusion       
2. Cohesive  
3. Surface tension
4. Adhesive  
5. Osmosis

(iv) A pin-hole camera 200 mm long produces an image of 2 mm diameter of the sun. If the sun's distance from the earth is about km , what is the diameter of the sun?

1. 1.5 x 10 ⁸ km
   
2. 1.5 x 10 ⁶ km
   
3. 3 x 10 ⁵ km
   
4. 7.5 x 10 ⁴ km
   
5. 3.0 x 10 ³ km

(v) Which phenomena is a result of the earth being exactly along the same line between the centre of the sun and the moon?

1. Lunar eclipse
2. Penumbra
3. Solar eclipse
4. Umbra
5. Reflection

(vi) Which metals become strongly magnetized when subjected to a magnetic field?

1. Nickel and copper
2. Zinc and aluminium
3. Cobalt and iron
4. Aluminium and lead
5. Iron and zinc

(vii) A body moved upward a distance of 20 m. Calculate the time taken to reach the maximum height.

1. 2 s
2. 5 s
3. 10 s   
4. 15 s   
5. 11 s

(viii) The temperature of a certain liquid is measured to be 300 K. What will be its temperature in degree centigrade?

1. 273⁰ c   
2. 100⁰ c   
3.  57 ⁰ C
4. 37⁰ C
5. 27⁰ C

(ix)Which factors influence friction between tyres of a car moving with constant speed and the surface of the road?

1.  Weight and speed
2. Speed and nature of the surface
3. Nature of the surface and weight
4. Surface area of the tires and speed
5. Acceleration and nature of the surface

(x) When the sun shines on the dark-coloured driving wheel of a car, the wheel feels warm. Why?

1.  It is because the sun warms the car by induction.
2.  It is because the sun gives energy to the wheel by convection.
3.  It is because the sun radiates thermal energy to the wheel.
4.  It is because the sun radiates heat to the glass windows.
5. It is because the sun conducts thermal •energy to the wheel.