KCPE PAST PAPERS 2012: SCIENCE QUESTIONS AND ANSWERS [QNS 26-50]

5/11/2019

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KCPE PAST PAPERS 2012: SCIENCE QUESTIONS AND ANSWERS [QNS 26-50]

Question 26.

A card made in the shape of letter E and numbers 1,2 and 3 written on it was placed in front of a mirror as shown in the diagram below.

Which of the following CORRECTLY represents the image as seen in the mirror?

Question 27.

The reason why improved jikos have a clay lining is to

A. reduce the amount of heat loss
B. reduce the space for charcoal
C. make charcoal light faster
D. make the jiko last longer.

Question 28.

Which of the following practices will NOT result in a person getting an electric shock?

A. Touching sockets with wet hands.
B. Putting pencils in sockets.
C. Overloading the sockets.
D. Putting iron nails in sockets.

Question 29.

Which of the following groups of sources of energy are renewable?

A. charcoal, kerosene, sawdust.
B. water, firewood, animal dung.
C. Diesel, wind, natural gas.
D. Biogas, petrol, coal.

Question 30.

Which of the following pairs of food is preserved by smoking, salting and drying?

A. Meat and mushrooms.
B. Beans and fish.
C. Mushrooms and beans.
D. Meat and fish.

Question 31.

Which of the following is the MAIN reason why eating bread after expiry date is discouraged? The bread could have

A. lost nutrients
B. a bad taste
C. some micro-organisms
D. changed its colour.

Question 32.

Which of the following pairs consists of diseases caused by lack of minerals in the diet?

A. Anaemia and rickets.
B. Kwashiokor and anaemia.
C. Marasmus and Kwashiokor.
D. Rickets and marasmus.

Question 33.

A hilly area with deep channels is LIKELY to be experiencing

A. sheet erosion
B. gulley erosion
C. nil erosion
D. splash erosion.

Question 34.

The diagram below shows an improvised rain gauge.

The collecting bottle should

A. have the funnel sealed to its mouth
B. be wide to collect enough water
C. be placed above the ground
D. be transparent for easy reading.

Question 35.

The diagram below represents a model of the solar system prepared by class six pupils.

The mistake made in the model was

A. using threads instead of wires
B. placing a ball of clay next to the one representing the sun
C. placing two balls of clay on one thread
D. using balls of clay of different sizes.

Question 36.

The MAIN reason why mothers are encouraged to breast feed their infants is because breast milk

A. boosts immunity of the infant
B. is free from disease causing germs
C. is at the right temperature for infants
D. is easily digested by infants.

Question 37.

A person in the incubation period of HIV infection will show

A. signs and symptoms but test negative
B. no signs and no symptoms but test positive
C. no signs, no symptoms and test negative
D. signs, symptoms and test positive.

Question 38.

Which of the following is a preventive measure against the spread of tuberculosis?

A. Clearing bushes around houses.
B. Boiling drinking water.
C. Proper disposal of human waste.
D. Living in a well ventilated house.

Question 39.

In which of the following are characteristics of cumulus and nimbus clouds CORRECTLY placed?

Question 40.

For two masses X and Y, the mass of X was twice that of Y. The diagram below shows a set-up that was used to investigate how thetwo masses balance at positions Q, R, S and T on a seesaw.

Which of the following was a correct observation about the investigation?

Question 41.

The diagram below represents a simple electric circuit

Which of the following energy transformations would take place when the switch is on?

A. Chemical—>electrical——>heat—>light.
B. Electrical—>chemical—>Light--->heat.
C. Chemical—>electrical——>Light--->heat.
D. Electrical—>light—>chemical—>heat.

Question 42.

Which of the following practices LEAST pollutes the soil?

A. Spraying crops to kill pests.
B. Burning plant wastes in the farm.
C. Disposing of animal wastes in the farm.
D. Burying plastics in the soil.

Question 43.

In an investigation, equal amounts of soap was added to equal amounts of water samples W and Z obtained from different sources.

The following observations were made:
(i) W formed lather.
(ii) Z formed suspended particles.
Which of the following statements about W and Z is NOT CORRECT?

A. W may have fewer minerals.
B. Z may form lather after boiling.
C. W can form scales in kettles.
D. Z wastes soap when washing.

Question 44.

Which of the following consists of materials with a definite volume and definite shape?

A. Water, bottle, stone.
B. Paper, pin, ink.
C. Kerosene, cooking oil, milk.
D. Sand, flour, sugar.

Question 45.

Which of the following practices will conserve soil?

A. Using dry grass for mulching.
B. Burning vegetation on farms.
C. Ploughing along the slope.
D. Burying plastic materials.

Question 46.

Soil becomes waterlogged due to

A. its colour
B: the size of its particles
C. the absence of small animals in it
D. the amount of air in it.

Question 47.

Which of the following is the CORRECT procedure that is used to obtain clear water from muddy water?

A. Filtering and decanting.
B. Evaporating and filtering.
C. Decanting and filtering.
D. Evaporating and decanting.

Question 48.

A. Spraying and de-worming.
B. Herding and dipping.
C. De-worming and rotational grazing.
D. Dipping and spraying.

Question 49.

Which one of the following statements is TRUE about manures? They

A. increase the growth of weeds
B. release specific nutrients to the soil
C. destroy micro-organism in the soil
D. cause pollution of the soil.

Question 50.

The following are activities that pollute the environment.

(i) Burning charcoal in a closed room.
(ii) Oil spillage from tankers.
(iii) Using diesel as fuel in vehicles.
(iv) Dumping vegetable waste.
Which activities pollute air?

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

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