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
Answer:B
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
materials
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
About The Author
