Science Questions and Answers - Class 8 Opener Exams Term 1 2023 Set 5

QUESTIONS

1. The carbon dioxide carried during blood circulation is removed from the blood stream in the _______________________
   
   1. Aorta
   2. Left auricle
   3. Lungs
   4. Rightauricle
2. Which of the following units cannot be used for measuring the mass of an object?
   
   1. Newtons
   2. Gram
   3. Kilogram
   4. Tonne
3. The collecting bottle in simple raingauge is placed 30cm above the ground level to _________________________
   
   1. Obstruct the wind
   2. Make it easily visible
   3. Collect as much rainwater as possible
   4. Prevent the water on the ground from splashing into the funnel.
4. The extent to which a type of soil tells smooth or rough is called __________________________
   
   1. Soil capillarity
   2. Soil texture
   3. Drainage
   4. Water retention
5. Many farmers keep bees in their orchards because bees __________________________
   
   1. Make the fruits sweet by injecting honey
   2. Help in cross-pollination
   3. Kill harmful insects
   4. Drive away thieves who come to steal the fruits
6. During birth aring of muscle called the _________________________ relaxes
   
   1. Vagina
   2. Oviduct
   3. Cervix
   4. Ureter
7. Which of the following disease is not an S.T.I?
   1. Meningitis
   2. Genital herpes
   3. Chancroid
   4. Gonorrhoea
8. A Std 5 pupil while walking in a nearby swampy area saw roots that were above the ground. What is the name of the roots the pupil saw?
   
   1. Hair roots
   2. Prop roots
   3. Aerial roots
   4. Fibrous roots
9. A peer group is a ___________________________
   
   1. Group of pupils in the same class
   2. Group of people playing together
   3. Group of people of the same age
   4. Group of people with the same interest
10. Which is the correct order of the blood passing through the heart
    
    1. Aorta → Pulmonary vein → Venacava → Pulmonary Artery
    2. Aorta → Venacava → Pulmonary artery → Pulmonary vein
    3. Venacava → Pulmonary vein → Aort → Pulmonary artery
    4. Venacava → Pulmonary artery → Pulmonary vein → Aorta
11. The following diagram represents an air thermometer. What is likely to happen on a hot day?
    
    
    1. Liquid water in the straw rises
    2. Liquid water in the straw drops
    3. Liquid water in the beaker drops
    4. No changes occurs
12. Std 7 pupil in Chegul Primary School studied the feeding relationship in the following: pawpaw flower, eagle, butterfly, chameleon. Which of the following shows the correct food chain?
    
    1. Nectar → Butterfly → Eagle→ Chameleon
    2. Nectar → Eagle → Butterfly → Chameleon
    3. Nectar → Butterfly → Chameleon → Eagle
    4. Nectar → Chameleon → Butterfly → Eagle
13. A fish is able to float in water because ______________________
    1. It has a streamlined body
    2. It has fins
    3. It has a swim bladder
    4. Presence of scales
14.  Gabions are also called ______________________
    
    1. Porous dams
    2. Impervious dams
    3. Champions
    4. Porous rocks
15. Three of the body parts listed below are related. Which is the odd one out?
    
    1. Sweat glands
    2. Dermis
    3. Epidermis
    4. Ureter
16. Kamau has a swollen cheek. He feels much pain everytime he rinses his mouth with cold water or warm water. What teeth disease does Kamau have?
    
    1. Gingivitis
    2. Cavities
    3. Dental carries
    4. Bleeding gums
17. Which one of the following is not true about the external parasites?
    
    1. They cause skin irritation to the animal
    2. They are found within the body of the animal
    3. They may cause anaemia to the animal 
    4. They are found outside the animals body
18. Std 7 pupils took science walk to a nearby pod. One of the pupils poured a tin of oil into the water. They returned after a few days and found all the fish had died. What is the most likely reason for this?
    
    1. The fish had been killed by other animals 
    2. The oil contains poisonous substances
    3. Water is necessary for all living things 
    4. Oil polluted the water in the pod and reduced the amount of oxygen in the water
19. In which category does a maize plant belong?
    
    1. Mesophytes
    2. Grass plants
    3. Xerophytes
    4. Hydrophytes
20. Which one of the following methods of preserving food is both a traditional and modern method?
    
    1. Drying
    2. Salting
    3. Canning
    4. Smoking
21. Which substance is found in tobacco that makes it addictive to the user?
    
    1. Carbon monoxide
    2. Tar
    3. Nicotine
    4. Carbon dioxide
22. The diagram below shows a balloon that was tied to a bottle and then dipped in a container with hot water
    
    Which of the following is not true about the above?
    1. Air occupies space
    2. Matter expands on heating
    3. Hot air rises
    4. Air has weight
23. Which one of the following substances would work best  to reduce friction in door hinges?
    
    1. Water
    2. Grease
    3. Paraffin
    4. Milky water
24. Changing gas to solid is referred as __________________________
    
    1. Solidifying
    2. Sublimation
    3. Liquefying
    4. Condensation

Study the diagram below and answer question 25:-

25. What type of pollination is demonstrated by the diagram above
    
    1. Cross pollination
       
    2. Self pollination
    3. Insect pollination
    4. Wind pollination
26. We say liquids are miscible when they _________________________
    
    1. Do not mix
    2. Mix for sometime
    3. Mix completely
    4. Mix partially
27. Which one of the following is a magnetic material?
    
    1. Iron
    2. Aluminium
    3. Copper
    4. Zinc
28. Which part of the plant is usually affected by spots and streaks?
    
    1. Root
    2. Stem
    3. Leaf
    4. Flower
29. Which is the most effective way of preventing S.T.I?
    
    1. Use of condoms
    2. Abstinence
    3. Mutual monogamy
    4. Talking to your partner
30. Which two letters in the diagram below stands for the major blood vessels?
    
    
    1. B and D
    2. Cand D
    3. A and C
    4. A and D
31. The use of the earth wire is to ________________________
    
    1. Carry excess electricity to the ground
    2. Resist large electric currents
    3. Help in lighting houses which do not have wires
    4. Prevent lighting from striking houses
32. Which of the following shows the inner planets
    1. Mercury, Mars, Earth
    2. Saturn, Neptune, Pluto 
    3. Jupiter, Saturn, Uranus
    4. Mercury, Mars, Pluto
33. The following are plant nutrients which one is a micro-nutrient.
    
    1. Calcium
    2. Iron
    3. Potassium
    4. Nitrogen

Use the diagram below to answer question 34.

34. Which component of soil is being tested above?
    
    1. Soil has air
    2. Soil contains water
    3. Soil can burn
    4. Soil contains organic matter
35. The difference between the planet Venus and other planets is that _________________________
    
    1. It rotates clockwise
    2. It rotates anticlockwise
    3. It is the biggest planet
    4. It is the smallest planet
36. Which one of the following groups of weather instruments works on the principle that matter expands on heating and contracts on heating?
    1. Barometer and windvane
    2. Thermometer and raingauge
    3. Thermometer and hygrometer
    4. Thermometer and windsock
37. Which one of the following is not a form of ear protection?
    
    1. Earphones
    2. Ear defenders
    3. Earplugs
    4. Earmusts
38. Mr. Mwangi saw a child basking in the sun. Which disease is the child least likely to suffer from?
    
    1. Marasmus
    2. Beriberi
    3. Scurvy
    4. Rickets

Use the diagram below to answer question 39:-

39. The name of the gas represented by the sector with 0.03% is _______________________
    
    1. Nitrogen
    2. Oxygen
    3. Carbondioxide
    4. Inert gases
40. Which one of the following is a useful non-green plant?
    
    1. Athletes foot
    2. Dandruff
    3. Ringworm
    4. Yeast
41. The bush near Mahua primary is inhibited by locusts, snakes and lizards. Which food chain shows the correct feeding relationship among the animals?
    1. Leaves → Locusts → Lizards → Snakes
    2. Snakes → Lizards → Locust → Leaves
    3. Leaves → Locust → Snakes → Lizard
    4. Snakes → Locust → Lizards → Leaves
42. Which blood component is wrongly matched with its function?
    
    1. Plasma-Carries water product from the body to the excretory organs
    2. Red cells-Carry carbon dioxide from the rest of the body to the lungs
    3. White cells-Protect the body against disease causing germs
    4. Platelets-Help in the clotting of blood
43. Which of the following mixtures can be separated using a magnet?
    
    1. Sand and maize
    2. Milk and water
    3. Water and paraffin
    4. Sand and iron powder
44. Which weed is used as a vegetable by many communities in Kenya?
    
    1. Oxalis
    2. Wandering jew
    3. Pigweed
    4. Mexican marigold
45. Group of stars makes some patterns on the sky. These patterns are called ________________________
    
    1. Astronomers
    2. Constellation
    3. Meteors
    4. Shooting stars
46. In the following set up different soils were put in funnels and placed on 3 bottles of the same size.
    
    Which soil had the best drainage or released the most water in the shortest time when equal amount of water is added in each soil..
    1. B
    2. C
    3. D
    4. None
47. When we shake some soil in a bottle of water and then allow it to settle, which of the following will form the topmost layer?
    
    1. Water
    2. Fine soil
    3. Organic matter
    4. Inorganic matter
48. Which of the following would make the best mirror?
    1. Transparent material
    2. An opaque shiny smooth surface
    3. Opaque rough surface
    4. A transparent rough surface
49. Which statement best explains why insects can walk on water?
    
    1. They are light in weight
    2. Water is heavier than insects
    3. Surface tension of the water prevents it from sinking
    4. Insects can swim in water
50. Which of the following pairs of processes is as a result of increase in temperature?
    
    1. Melting and freezing
    2. Condensation and freezing
    3. Melting and evaporation
    4. Condensation and evaporation

MARKING SCHEME

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