COACH ALLY VOCATIONAL TRAINING CENTER

PHYSICS PAPER

SENIOR FOUR

STUDENT’S NAME______________________________NUMBER__________SIGNATURE___________

INSTUCTIONS. Read ALL the instructions provided by the examiner in each section.

SECTION A (15 Marks)

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

A Measuring tape and vernier caliper B Slide rule and micrometer screw gauge

C Vernier caliper and slide rule D Micrometer screw gauge and vernier caliper

E Metre rule and micrometer screw gauge

(ii) A piece of 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?

A 100 cm3 B 0.25 cm3 C 25 cm3 D 100.25cm3 E 0.025 cm3

(iii) A layer of colorless water floating on a blue copper (II) sulphate solution becomes blue after

sometime. Which physical process supports the observation made?

A Diffusion B Cohesive C Surface tension

(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 1.5×10 8 km, what is the diameter of the sun?

A 1.5×10 8 km B 1.5×10 6 km C 3×10 5 km

D 7.5×10 4 km E 3.0×10 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?

A Lunar eclipse B Penumbra C Solar eclipse D Umbra E Reflection

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

A Nickel and copper B Zinc and aluminium C Cobalt and iron D Aluminium and lead E Iron and zinc

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

A 2 s B 5 s C 10 s D 15 s E 11 sthis and other free resources at: http:maktaba.tetea.org

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

A 273°C B 100°C C 57°C D 37°C E 27°C

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

A Weight and speed B Speed and nature of the surface C Nature of the surface and weight

D Surface area of the tires and speed E 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?

A It is because the sun warms the car by induction. B It is because the sun gives energy to the wheel by convection.

C It is because the sun radiates thermal energy to the wheel. D It is because the sun conducts thermal energy to the wheel.

E It is because the sun conducts thermal energy to the wheel.

2. Matchlist the items below

LIST A LIST B

A. Main scale

C. Depth probe

D. Vernier scale

E. Outside jaws

E. Inside jaws

3 (a) Define the terms scalar and vector and give examples in each

(b) Distinguish between scalar quantities and vector quantities

(c) What is relative velocity

(d)Two cars A and B are moving along a straight line road in the same direction with velocity of 38 km/h and 66 km/h respectively.

(i) Find the velocity of car A to car B (ii) if two cars A and B are moving along a straight road in opposite direction .

4. (a) Explain with examples the term friction (b) Define the following terms (i) normal reaction (ii) limiting friction

(iii) coefficient of dynamic friction (iv) coefficient of static friction

(c) Massamu has a mass of 8kg , she slides on an inclined plane and makes the angle of 450 with the horizontal

if the frictional force is ignored find the acceleration of Massamu.

5. (a) Define the term energy and state it’s si unit (b) Define the si unit of energy (c) List (8) different forms of energy

(d) Mention two forms of mechanical energy (e) Differentiate the two forms of mechanical energy

(f) A stone of mass 6kg is lifted by Angel to a height of 10m above the ground . Find the potential energy of the stone

take [g= 10m/s2]

(g) Atrain of mass 250kg is travelling at 100km per hour . calculate the kinetic energy of the train.

(h) The kinetic energy of the girl of mass 20kg is 1000J. what is her speed?

6. (a) Define the following (i) static electricity (ii) charge (iii) capacitance (iv) electroforus (v) goldleafe electroscope

(b) Briefly explain the ways of charging a body (vi) outline the ways of charging a gold leaf electroscope

(c) State the electronic law of repulsion and attraction. (d) Draw a well labeled diagram of a gold leaf electroscope.

7. (a) Define the following terms and state their si unit (i) electric current (ii) resistance (iii) resistivity (iv) conductor

(b) State ohm’s law (c) What are the limitations of ohms law (d) Given the potential difference of the circuit is 9v

and the current is 3A . find the resistance of the circuit.

8. (a) What Is meant by a fuse (b) How does fuse prevent the large current from entering the circuit in the appliance

I Fuse wires are labeled 1A, 1.6A, 9A , 30A and 40A . Which of this is most suitable for

(i) A refrigerator rated 250V , 400W (ii) The electric cooker rated 240V,7.2 kw (iii)The electric iron rate 2240V,2kw

(iv)Water heater rated 240V,9.48kw

(d) A domestic lamp is marked 240V, 60W. calculate the (i) maximum current it takes (ii) resistance of the filament of the lamp.

9. Draw a well labeld diagram of x- tube

YOU WILL ALWAYS REAP WHAT YOU SAW

[SIKU ZOTE MTU HUVUNA ALICHO PANDA]

PHYSICS DEPARTMENT

BY BROTHER JUMA SOSPETER