KCPE PAST PAPERS 2006: SCIENCE QUESTIONS AND ANSWERS [25-50]

28/8/2019

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KCPE PAST PAPERS 2006: SCIENCE QUESTIONS AND ANSWERS [25-50]

26.

A pupil investigating a certain aspect of pressure in a liquid used a setup shown in the diagram below

What conclusion could the pupil make from the investigation?

A. Air exerts pressure on the surface of a liquid
B. Pressure in a liquid increases with depth
C. Pressure in a liquid is equal at the same depth
D. Pressure in a liquid is exerted on the sides only

27.

The temperature at which a substance freezes is the same temperature at which the substance

A. Condenses
B. Evaporates
C. Boils
D. Melts

28.

Which one of the following consists of only substances that have no definite shape but have definite volume?

A. Stone, kerosene, carbon dioxide
B. Oil, toothpaste, glue
C. Clay, flour, cement
D. Nitrogen, oxygen, water vapour

29.

The diagram below represents a setup that can be used to demonstrate heat transfer in air

For the demonstration to work a burning candle must be placed at

A. P
B. Q
C. R
D. S

30.

The percentage of the component of air that is fixed by bacteria in root nodules to make nutrients for the plant is

A. 0.03%
B. 0.97%
C. 21%
D. 78%

31.

Which one of the following is the last step when separating a mixture of sand and salt?

A. Dissolving
B. Filtering
C. Evaporating
D. Decanting

32.

The diagram below shows a stone being thrown using a catapult

The form of energy in the rubber band before the stone is released is

A. Kinetic
B. Potential
C. Chemical
D. Sound

33.

Which one of the following is CORRECT about a solar heater? A solar heater changes

A. Heat energy to electrical energy
B. Light energy to electrical energy
C. Chemical energy to heat energy
D. Light energy to heat energy

34.

Tall buildings are fitted with sharp pointed metal rods at their tops and connected to the ground. The rods are for

A. Protecting the buildings against lightning
B. Protecting electricity users from being electrocuted
C. Fixing aerials for radios and televisions
D. Allowing expansion of walls during hot weather

35.

Which one of the following is TRUE about the rainbow? It forms

A. Before heavy rainfall
B. When it rains while the sun is shining
C. When the sky is covered with thick clouds
D. When it rains in the afternoon

36.

Which one of the following energy transformations take place when a radio that uses cells is operating?

37.

Which one of the following sources of energy DOES NOT contain chemical energy?

A. Car battery
B. Bicycle dynamo
C. Food
D. Firewood

38.

Heat reaches the feet of a person seated by the side of a fire by

A. Conduction and convection
B. Radiation only
C. Convection only
D. Radiation and convection

39.

Which one of the following DOES NOT pollute the air?

A. Exhaust gases from aeroplanes
B. Smoke from burning charcoal
C. Smoke from burning domestic wastes
D. Gases from decaying animals

40.

The main reason why it is advisable to spray crops in the direction of wind is to avoid

A. The chemicals getting into contact with the skin
B. Wastage of chemicals
C. Polluting the air
D. Inhaling the chemicals

41.

The following signs and symptoms were observed in a certain child

(i) Thin and weak
(ii) Wrinkled face
(iii) Pot bellied
(iv) Hungry and crying a lot

The child was most likely suffering from

A. Anaemia
B. Rickets
C. Kwashiokor
D. Marasmus

42.

Which one of the following groups consists only of foodstuffs that protect the body against diseases?

A. Lemon, cabbage, carrot
B. Beans, groundnuts, fish
C. Maize, potatoes, rice
D. Meat, oranges, spinach

43.

The purpose of salt in food preservation is to

A. Remove water
B. Add flavour
C. Remove air
D. Lower the temperature

44.

The most likely reason why some expectant mothers crave for soil is to

A. Increase breast milk production after delivery
B. Increase appetite
C. Help in digestion of food
D. Provide sufficient mineral nutrients

45.

Which one of the following levers when in use has the position of the effort between the load and the fulcrum?

A. Spade
B. Wheelbarrow
C. Claw hammer
D. Crowbar

46.

A single fixed pulley

A. Changes direction of force
B. Increases effort distance
C. Reduces effort required
D. Reduces load distance

47.

The diagram below represents a tyre of a vehicle

The purpose of treads in the vehicle tyre is to

A. Make them last longer
B. Increase grip on the road
C. Reduce surface area
D. Make them lighter

48.

The following activities are carried out when making a beam balance but not in the correct order

(i) Suspend the arm to find balance point and mark
(ii) Make a base, a stand and the arm
(iii) Fix the stand and the arm to the base
(iv) Suspend tins on both sides of the arm

Which one of the following is the CORRECT order in which the activities are carried out?

A. (iii) (i) (ii) (iv)
B. (ii) (i) (iii) (iv)
C. (iii) (ii) (iv) (i)
D. (ii) (i) (iv) (iii)

49.

Which one of the following statements is CORRECT about a stone thrown a few metres directly upwards by a passenger in a moving lorry? The stone will fall

A. In front of the person
B. Behind the person
C. On the person
D. Behind the lorry

50.

The diagram below represents a certain weed

The weed is

A. Pigweed
B. Mexican marigold
C. Black jack
D. oxalis

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