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Physics Question Paper

Physics

Course:Secondary Level

Exam Year:2012

KARIMA GIRL HIGH SCHOOL

MOCK OF KCSE

DATE:8/7/2012

TIME:2HRS 30MIN

PHYSICS

INSTRUCTIONS TO CANDIDATE
1.All questions are compulsory.
2.Read all questions and answer only what is asked.
3.Cheating will lead to deduction of 5% of total marks scored.

Q.1.Define the term pressure and state its SI unit. (2 marks)
Q.2.Explain each of the following observations:
a)The sinking of the wheels of a lorry into soft sand may be prevented by letting off some air from the tyre. (2 marks)
b)Trucks which carry heavy loads have many wheels. (2 marks)
c) Ducks are able to walk over swampy grounds without sinking.
Q.3.Calculate the pressure under a girl's feet if her mass is 33.6kg and the area of contact of one foot is 84cm2. (4 marks)
Q.4.The weight of a book resting on a table is 2.7 N.If the area of the book in contact with the table is 0.012m2,determine the pressure exerted by the book on the table.
(4 marks)
Q.5.A stone pillar has a mass of 3.0tonnes. If the area of its base is 0.3m2,Calculate the pressure under the pillar. (4 marks)
Q.6. A metal block of density 3000kgm is 20m high and stands on a square base of side 5m.
a) What is the mass of the block? (5 mark)
b)What is the pressure exerted by the weight of the block on the surface which it stands? (5 marks)
Q.7.A rectangular concrete block measures 60cm by 30cm by 20cm and has a mass of 30kg. Calculate the maximum and minimum pressure it can exert through its surfaces. (5 marks)
Q.8.The height of mercury in a barometer at a place is 0.75m.Calculate the atmospheric pressure at the place. (5 marks)
Q.9.The surface area of a small submarine is about 1200m2. What force would be exerted on the submarine by water if it was submerged to a depth of 50m? (5 marks)
Q.10.A diver is 40m below the surface of an ocean. If the density of the sea water is 0.0001kgm,Determine the total pressure acting on the diver.
(5 marks)
Q.12.A hydraulic press consists of two cylinders of cross-sectional areas 0.2m2 and 5.0m2.If the prison in the smaller cylinder is pushed down with a force of 100N,Calculate:
a)The pressure transmitted by the fluid. (5 marks)
b) The force exerted on the piston in the larger cylinder. (5 marks)

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