EAGLE WINGS EDUCATION SERVICES.
PHYSICS PAPER FORM THREE
TIME: 1.40HRS , NAME…………………………………………………. PLAN…………
INSTRUCTIONS:1.Answer ALL questions.2.Read the question carefully.3.Each question carries a different weight.
SECTION A ( Choose the answer correctly)
1.(i)Which of the following sources of energy are non-renewable?
A. Water, wind, wood and natural gas. B Fossils, sun, oil and nuclear.
C. Natural gas, water, nuclear and wood. D Wind, sun, fossils and oil.
E. Oil and all natural gas
(ii) 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?
A 11.2 N .B 12 N. C 22.4 N.D 1.2 N E 1.12 N.
(iii).In a laboratorythe diameter of a piece of wire can accurately be measured by
A Vernier Calliper .B Micrometer screw gauge .C Engineer’s Calliper
D Rate meter .E A thread wound round it once.
(iv) A bus carrying a very big load on its top carrier can easily overturn because
A it cannot run fast. B its equilibrium is stable. C its centre of gravity is low
D it is more stable and can run fast. E its centre of gravity is high.
(v) (vii) When charging a body by friction, the particles which are transferred are
A protons. Bnuclei and protons. C nuclei D electronsE protons and electrons.
2. (a) Define the following terms as applied to machines:
(i) Load (ii) Effort (iii) Efficiency
(b) A load of 500 N is raised through 5 m by a machine when its effort moves simultaneously though a distance of 25 m. If the efficiency of the machine is 80%, calculate its mechanical advantage.
3.(i) State the law of conservation of linear momentum.
(ii) Define the term “elastic collision”.
(b) A body of mass 8 kg moving with a velocity of 20 m/s collides with another body of mass 4 kg moving with a velocity of 10 m/s in the same direction. The velocity of the 8 kg body is reduced to 15 m/s after the collision. If the bodies do not stick together after the collision, calculate the final velocity of the 4 kg body.
4. Define the following (i) Resistance (ii) Resistivity (iii)
(a)State the factors which determine the resistance of a conductor.
(b)Find the length of nichrome wire of diameter 0.56 mm which will provide a resistance of100 Ω given that its resistivity is 10^-6Ωm.
5. (a)(i)What are sustainable energy sources?
(ii)State four applications of energy generated from water.
(b) (i)Define geothermal energy.
(ii) Briefly explain how geothermal energy can be harnessed.
(c)(i)What is a windmill?
(ii) Mention three disadvantages of energy caused by wind.
(iii) Does wind itself possess energy? Explain.
*SUCCESS IN NOT IN FORM OF CHANCE BUT HARD WORKING*
PREPARED BY BROTHER JUMA SOSPETER