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Science Past Questions and Answer

Science Past Questions and answers

Science Past Questions and answers The answers for the object testes are the options in bold or deepened

1. The flagpole operates on the principle of a simple machine.

A. Wheel and axle

B. Lever

C. Pulley

D. Inclined plane


Answer: . Pulley


2. It is easier to loosen a tight knob with a long spanner than a short one because the long spanner

A. Does more work

B. Does little work

C. Requires less effort

D. Overcomes less frictional resistance


Answer: Requires less effort


3. In an electrically neutral atom, the

A. Number of protons and neutrons are equal

B. Mass number is the same as neuron number

C. Number of protons are more than neurons

D. Number of protons and electrons are equal


Answer: Number of protons and electrons are equal


4. The number of electrons in the outermost shell of an element with atomic number 20 is.

A. 2

B. 6

C. 8

D. 10


Answer: 2

5. A machine lifts a load of 300 N. If the effort applied is 150 N , the mechanical advantage is

A. 0.5

B. 2. 0

C. 150

D. 450


Answer: . 0.5


6. The elements in a compound are chemically combined

A. In a simple ratio

B. In different ratios

C. According to their sizes

D. With magnetic forces


Answer: In a simple ratio


7. Which of the following alloys is used to make trumpet?

A. Brass

B. Nickel

C. Solder

D. Bronze


Answer: brass


8. The metal used to galvanize iron is

A. Magnesium

B. Tin

C. Lead

D. Zinc


Answer: zinc


9. In the carbon cycle, carbon is transferred to animals when they

A. Respire

B. Feed on plants or other animals

C. Feeds on plants only

D. Absorbs the sun’s energy


Answer:. Feed on plants or other animals


10. An element located on the extreme Left side of the periodic table Must be

A. Metal

B. Non-metal

C. Semi-metal

D. Metalloid


Answer: metal


Science Past Questions and answers



11. Sugar does not contain

A. Carbon

B. Oxygen

C. Nitrogen

D. Hydrogen


Answer:  Nitrogen


12. Both Osmosis and diffusion involves the

A. Movement of gases

B. Movement of water

C. Semi-permeable membrane

D. Movement of molecules


Answer: Movement of molecules


13. Which of the following is not a mixture?

A. Palm wine

B. Milk

C. Salt

D. Blood


Answer: salt


14. The chemical symbol for boron is

A. Bo

B. Be

C. B

D. Bn



15. Which of the following is a colloid?

A. Jelly

B. Alcohol

C. Milk

D. Tea


Answer: milk


16. Metal scraps can be separated from plastic waste materials through

A. Decantation

B. Sublimation

C. Magnetic separation

D. Crystallization


Answer: . Magnetic separation


17. Which of the following distinguishes osmosis from diffusion?

A. Osmosis is faster than diffusion

B. Osmosis only occurs in gas

C. Semi-permeable membrane is involved

D. Diffusion occur in tissues only


Answer: . Semi-permeable membrane is involved


18. The chemical formula of copper (II) oxide is

A. CuO.

B. Cu2O.

C. CuO2.

D. C2O.


Answer: CuO.


19. Aluminum is good for making wire because it is

A. Brittle

B. Ductile

C. Malleable

D. Shiny


Answer: . Ductile


20. Air is not a compound because

A. It is made up of plenty gases

B. The gases are chemically bonded

C. The components can be separated

D. It can not be seen


Answer: . The components can be separated


Science Past Questions and answers


21. Identical twins occur when

A. A fertilized egg divides into two

B. Two eggs are fertilized at once

C. A zygote is not formed well

D. Two eggs are fertilized separately


Answer: A. A fertilized egg divides into two


22. An auto mechanic Uses petrol to get wash his hands because

A. Petrol is a liquid

B. His hands are clean

C. Grease is soluble in petrol

D. Grease is a solid


Answer: Grease is soluble in petrol


23. The hydraulic jack uses

A. Density of liquids

B. Mass of load

C. Hydrogen gas exchange

D. Pressure in fluids


Answer: . Pressure in fluids


24. Heartheat can be felt as a pulse in the

A. Stomach

B. Knee

C. Groin

D. Wrist


Answer: wrist


25. One way we can determine pure water is

A. When it has a good aroma

B. When it is whitish in colour

C. When it tastes sweet

D. When it is odourless


Answer; When it is odourless


26. Which of the following happens during fertilization in humans?

A. Membrane forms around the egg

B. One sperm fuses with the egg

C. The egg divides into two

D. The egg moves into the egg tube.


Answer: . One sperm fuses with the egg

27. The testes of Man hang in a sac called

A. Uterus

B. Scrotum

C. Epididymis

D. Penis


Answer:  Scrotum


28. The surface area of a triangular mean pie with base 15 cm and height 12 cm is

A. 27 cm2

B. 90 cm2

C. 60 cm2

D. 21 cm2.


Answer: 90 cm2


29. Hereditary is controlled by

A. Cell membrane

B. Sex cells

C. Genes.

D. Hormones


Answer: Genes


30. The right solve for chlorophyll is

A. Water

B. Petrol

C. Alcohol

D. Mercury


Answer:  Alcohol


Science Past Questions and answers



31. Friction must be reduced in machine parts to

A. Make movement impossible

B. Help to reduce speed

C. Avoid wear and tear of materials

D. Avoid production of moisture

Answer: Avoid wear and tear of




32. Internal parasites are controlled in farm animals by

A. Spraying

B. Injection

C. Drenching

D. Dipping


Answer. Drenching

33. Farm animals are not infested by

A. Tape worm

B. Liver fluke

C Earthworm

D. Hook worm


Answer: . Earthworm


34. A mixture of raw starch and water can Best be separated by

A. Decantation

B. Boiling

C. Distillation

D. Winnowing


Answer: Decantation


35. The force overcome by a machine is the

A. Effort

B. Load

C. Pivot

D. Work

Answer. Load

36. A sodium atom becomes an ion when it. A. Gains one electron.

B. Loses one electron.

C. Gains two electrons

D. Loses two electrons.


Answer: Loses one electron.


37. The efficiency of a machine would be zero if.

A. No work is done.

B. Work input equals work output

C. Work input is more than the work put

D. No energy was wasted


Answer: No work is done.


38. Harvesting rain is helpful in

A. Keeping water clean

B. Preventing water born diseases

C. Preventing the payment of water bills

D. Conserving water


Answer: Conserving water


39. The saliva in the mouth does not

A. Soften foods.

B. Lubricant food

C. Act on cooked starch

D. Start digesting all types of goods


Answer: Start digesting all types of goods


40. Soil is exposed to erosion by practicing

A. Bush burning

B. Contour ploughing

C. Strip cropping

D. Terracing


Answer: bush burning


Science past questions and answers

Section B. Solve all questions


1. a. The diagram below illustrates an organ in the human body.

Study the diagram carefully and answer the questions that follow.

I. Name the organ and the system to which it belongs.

Ii. What is the function of the organ shown above?

III. Name the four main divisions of the organ above.

IV. Name two other parts of the system to which the organ belongs.

V. Give two diseases associated with the organ above.

Vi. State two ways of keeping the organ healthy.

Science Past Questions and answers



b. A is a list of pests and parasites and B is a list of affected hosts.

A.                                           B

Weevils.                           Humans

Capsid.                               Fowl

Fleas.                                  Cocoa

Mites.                                 Pig

Blood fluke.                      Bean

I. Match correctly the pests and parasites in list A against host B

II. State three harmful effects of pests and parasites on farm animals

III. State two ways of controlling pests and parasites on the farm.



c. The table below shows the results of an experiment in which samples of water were tested by shaking with soap solution.

Science Past Questions and

I. State the observation when only 10cm3 of soap solution is shaken with 50cm3 of water from the lake.

II. Why did the lake water need only 1cm3 of soap solution to lather

III. Why did the lake water need so much of soap solution to lather?

IV. Explain why the boiled lake water needed less of the soap to lather.


d. Study the simple machine below and answer the questions that follow.

I. Name the type of simple machine above and the class it belongs to.

II. Explain why the machine belongs to the class mentioned above.

III. Identify the parts labeled I, II and III.

IV. If II is shifted from its position left or right, what effect would this have on the amount of effort used in doing work

Science Past Questions and answers

Try your hands on the practicals and send me your answer










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