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

​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).

MORE STD 8 REVISION RESOURCES

• https://drive.google.com/open?id=1cdxLC-nRPWN1S47IUQNNEB81Aoar4AaT
• https://www.atikaschool.org/kcpe-past-papers-and-answer/kcpe-2012-past-papers-answers-and-reports

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