Science Questions and Answers - Class 8 Opener Exams Term 3 2023 Set 1

1. Which among the following teeth related problem is prevented by eating a balanced diet?
   1. Tooth cavity
   2. Tooth decay
   3. Dental plaque
   4. Bleeding gum
2. The amniotic fluid in the foetal development process carries out the
   following functions except
   1. keeps the foetus warm
   2. prevents the foetus from shock
   3. allows free turning of the foetus
   4. prevents the mother's blood and foetus blood from mixing
      
      Study the diagram below and answer the question that fo
                  
3. Which blood vessels carry oxygenated blood and deoxygeneted blood
   respectively?
   1. W and Y
   2. Z and X
   3. W and X
   4. Z and Y
4. A 30cm plastic ruler will float on water while a 30cm metallic ruler will sink in water. This is due to difference in their
   1. size
   2. shape
   3. material
   4. weight
5. The best method of controlling livestock parasites that can control both mite and tapeworms is
   1. dipping
   2. dosing
   3. rotational grazing
   4. deworming
6. Which among the following sexually transmitted infections is wrongly matched with its cause?
   1. Gonorrhoea − Bacterium
   2. Syphillis − Bacterium
   3. Chancroid − virus
   4. HIV and AIDS − virus
7. The diagram below shows a method of preserving milk.
                          
   The method above preserves food by
   1. keeping off bacteria
   2. dehydrating food
   3. keeping off air
   4.  making bacteria inactive
8. The following are characteristics of a certain weed.
   1. Has fibrous roots
   2. Produces blue flowers
   3. Spreads on the ground
   4. Weak soft stems
      The weed described above is likely to be
      1. Black jack
      2. Wandering jew
      3. Sodom apple
      4. Mexican marigold
9. Which one of the following animals is wrongly matched with the product it provides?
   1. Sheep - mutton
   2. Goat - wool
   3. Cattle - milk
   4. Pig - pork
10. One of the following groups is made of beverage crops only. Which one?
    1. Coffee, simsim, flax
    2. Carrot, cocoa, coffee
    3. Coffee, Tea, Cocoa
    4. Barley, cotton, palm
11. A child with wasted muscles, alert eyes and cries often is likely to be suffering from a deficiency disease called
    1. kwashiorkor
    2. anaemia
    3. marasmus
    4. rickets
12. Which one of the following shows the correct path followed by urine as it moves out of the body?
    1. Kidney→ ureter→bladder → urethra
    2. Bladder→ kidney →ureter → urethra
    3. Kidney→ urethra→ bladder →→→ ureter
    4. Urethra→ bladder→ ureter → kidney
13. The diagram below shows a type of root system in plants.
                               
    Which plant below has the above type of root system?
    1. Onion
    2. Maize
    3. Mango
    4. Coconut
14. The following are signs and symptoms of a certain disease
    1. Diarrhoea
    2. Headache 
    3. Fever
    4. Pain in joints
       The disease with the above symptoms is likely to be
       1. Bilharzia
       2. Malaria
       3. Typhoid
       4. Tuberculosis
15. Which among the following drugs when abused will cause vomiting, breathing problems and brain damage?
    1. Mandrax
    2. Cobbler's glue
    3. Miraa
    4. Bhang
16. Which methods of separating mixture can be used to separate a mixture of sand, salt and iron filings?
    1. Dissolving, filtering, evaporation
    2. Use of a magnet, dissolving, filtering, evaporation
    3. Use of a magnet, filtering, evaporation
    4. Winnowing, dissolving, filtering, evaporationThe diagram below shows a weather
17. All the following sources of energy are renewable except one. Which one is it?
    1. Firewood
    2. Natural gas
    3. Biogas
    4. Charcoal
18. Which one of the following is a source of heat?
    1. Glowworm
    2. Moon
    3. Firefly
    4. Star
19. The diagram below shows a weather insrument.
                             
    Which statement is untrue about the weather instrument above?
    1. Shows where the wind is blowing from
    2. Tail end is twice as heavier than arrow head
    3. Uses the principle of air in motion
    4. The head and the tail is made up of manilla
20. In a certain investigation on sound energy, a bell rang, and one pupil whistled as others listened. Which property of sound was investigated?
    1. Types of sound
    2. Special sound
    3. Sound pollution
    4. Direction of sound
21. Which are the two living components of the environment?
    1. Air and water
    2. Soil and heat
    3. Liquid and sound
    4. Plants and animals
22. Bilharzia worms mainly attack which parts of the body?
    1. Bladder and intestines
    2. Stomach
    3. Large intestines
    4. Bladder and stomach 
23. Which among the following animals is wrongly matched with its mode of movement
    1. Cricket - flying
    2. Snail - gliding
    3. Duck - swimming
    4. Snake - slithering
24. The diagram below shows a set-up used by class 7 learners
                     
    Which material cannot be put in gap labelled AB to make the circuit complete?\
    1. Razor blade
    2. Plastic ruler
    3. Office pin
    4. Wet piece of wood
25. Which of the following is not an interdependence between plants and animals?
    1. Plants getting nutrients from animals
    2. Animals depending on plants for pollination
    3. Plants depending on animals for carbon dioxide
    4. Animals depending on plants for shelter
26. Which among the following concentrates is not correctly matched with its nutrients?
    Concentrate                      Nutrients
    1. Sunflower seeds         Minerals
    2. Fish meal                    Oil
    3. Salt licks                     Minerals
    4. Bone meal                  Mineral
27. Which of the following is the best advantage of breast milk to an infant?
    1. It is not allergic
    2. It is easier to digest
    3. Allows mother and child to bond
    4. It boosts the infant's immunity
28. Which of the following pairs of plants store their foods in their leaves?
    1. Carrots and potatoes
    2. Cabbage and onions
    3. Kales and carrots
    4. Potatoes and yams
29. Which vaccine is administered to infants the first time at the age of 6 weeks?
    1. DPT
    2. Polio vaccine
    3. BCG vaccine
    4. Yellow fever vaccine
30. The diagram below shows a simple machine
                              
    The above machine can be used to measure all the following except?
    1. friction
    2. mass
    3. weight
    4. gravitational pull
31. One of the following soil conversation measures conserves soil the same way as planting cover crop. Which one is it?
    1. Contour farming
    2. Mulching
    3. Terracing
    4. Gabbions
32. Which one of the following are corretly matched
       Magnetic                      Non-magnetic
    1. Copper                            Steel
    2. Steel                             Aluminium
    3. Aluminium                      Cobalt
    4. Zinc                                Copper
33. A grade five boy is sitting beside a fire source. Heat reaches his feet through:-
    1. radiation
    2. conduction
    3. convection
    4. convection and conduction
34. Which of the following does not produce digestive juice?
    1. Oesophagus
    2. Small intestines
    3. Mouth
    4. Stomach
35. The diagram below represents an improved jiko.
                         
    The above jiko is an example of
    1. source of light
    2. energy efficient device
    3. source of renewable energy
    4. way of using energy sparingly
36. Which mixture below can be separated by decanting?
    1. Sand and water
    2. Water and salt
    3. Iron filings and sand
    4. Maize and beans
37. The energy transformation in a radio using cells as source of energy is
    1. Chemical → Electrical → magnetic → kinectic → sound
    2. Electric → magnetic → kinetic → sound
    3. Chemical → Electrical → heat → light
    4. Chemical → Electrical → sound → magnetic
38. Which one is not correct about redblood cells?
    1. Have a disc shape
    2. Contain haemoglobin
    3. Are smaller than white cells
    4. Fight disease causing germs
39. Which one of the following pollutant corrodes corrugated iron sheets?
    1. Tobacco smoking
    2. Spraying farm chemical
    3. Aerosol sprays
    4. Industrial waste gased
40. Which one of the following substances has a definite mass only?
    1. Cooking fat
    2. Tooth paste
    3. Water
    4. Water vapour
41. Which one of the following does not show a way for caring and supporting people living with HIV and AIDS?
    1. Love and care
    2. Adequate nutrition
    3. Hygiene
    4. Withdrawal
42. The diagram below shows a simple machine
          
    Which machine when used to make work easier works the same as above?
    1. Wheelbarrow
    2. Single fixed pulley
    3. Crowbar
    4. Staircase
43. Which one of the following is not a disadvantage of hard water?
    1. Contains mineral salts
    2. Forms scales on utensils
    3. Discolours clothes
    4. Does not lather easily
44. Which one is not a function of fibre in the diet?
    
    1. Helps in digestion
    2. Empties the bowel
    3. Prevents constipation
    4. Helps in the movement
45. Which one of the following is not found in the dermis?
    1. Blood capillaries
    2. Sweat pore
    3. Sweat gland
    4. Fatty tissues
46. Which one of the following is not a sign of ill health in livestock?
    1. Loss of weight
    2. Rough coat
    3. Coughing
    4. Low yields
47. Below are advantages of manures. Which one is not?
    1. Contain specific nutrients
    2. Cheap to make
    3. Bind soil particles together
    4. Improve water holding capacity
48. Carbon dioxide in the atmosphere occupies a percentage of?
    1. 0.03%
    2. 21%
    3. 0.97%
    4. 78%
49. Which crop pest attacks seedlings?
    1. Stalk borers
    2. Cut worms
    3. Weevils
    4. Aphids
50. Nectar feeders have
    1. short, strong beaks
    2. short, curved beaks
    3. serrated beaks
    4. long, slender beaks

MARKING SCHEME

1. D
2. D
3. B
4. C
5. C
6. C
7. D
8. B
9. B
10. C
11. C
12. A
13. C
14. B
15. B
16. B
17. B
18. D
19. D
20. A
21. D
22. A
23. A
24. B
25. B
26. A
27. D
28. C
29. A
30. B
31. B
32. B
33. A
34. A
35. B
36. A
37. C
38. D
39. D
40. D
41. D
42. D
43. A
44. A
45. B
46. D
47. A
48. A
49. A
50. D