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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.

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

Picture
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.

Picture
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?

Picture
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.

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

Picture
Question 41.

The diagram below represents a simple electric circuit

Picture
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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