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

QUESTIONS   

1. Which pair of chambers of heart receives brightly coloured blood? 
   1. Right auricle and left ventricle
   2. Left auricle and left ventricle 
   3. Right ventricle and left ventricle 
   4. Right auricle and right ventricle
2. The diagram below represents a foetus developing in the uterus.
   
   Which one of the following shows the correct name of the part and its function?
   

   	Part	Name	Function
   A.	Y	Placenta	Carry food and oxygen.
   B.	Z	Amnion	Prevent the foetus from diseases.
   C.	W	Amniotic fluid	Act as a shock absorbers.
   D.	X	Umbilical cord	Facilitate food transfer.

3. During breathing in the following happens except
   
   1. The ribs move downwards and inwards
   2. The lungs expand
   3. The ribs move upwards and outwards
   4. The diaphragm flattens
4. During adolescence, both boys and girls
   1. develop broad hips
   2. start experiencing wet dreams
   3. develop deep voice
   4. increase in weight and height
5. The following are descriptions of a certain tooth.
   1. Last to be shed
   2. Have two roots
   3. Have uneven top
      The tooth described above is
      1. canine
      2. premolars
      3. incisors.
      4. molars
6. Insectivorous plants produce a juice to digest insect. What do they make after digesting the insects?
   1. Starch
   2. Proteins
   3. Nitrogen
   4. Vitamins
7. The diagram below represents a monocot seed.
   
   The parts represented by P, Q, R and S respectively are
   

   	P	Q	R	S
   A.	Endosperm	Plumule	Cotyledon	Radicle
   B.	Radicle	Cotyledon	Plumule	Endosperm
   C.	Plumule	Endosperm	Radicle	Cotyledon
   D.	Radicle	Cotyledon	Plumule	Endosperm

8. Which one of the following pairs of plants consists of legumes?
   1. Rice and maize
   2. Sorghum and oats
   3. Oats and green grams
   4. Peas and ground nuts
9. The following are green flowering plants except
   1. mosses
   2. banana
   3. cactus
   4. cabbage
10. Which one of the following is not an adaptation of plants that grow in moist soils?
    1. Increased number of stomach 
    2. Reduced number of stomata
    3. Stomata remain open most of the time
    4. Most of the stomata are on the upper surface of the leaf
11. The following are characteristics of vertebrates. 
    1. lay eggs
    2. fertilize their eggs externally 
    3. have scales
    4. have varying body temperature
       Which of the above characteristics are not true for both snakes and birds?
       1. (ii) and (iii)
       2. (iv) only
       3. (ii) and (iv)
       4. (i) and (iii)
12. The chart below shows some farm animals and their product.
    
    The products represented By X and Y respectively are
             X           Y
    
    1. Wool     Milk
    2. Milk       Beef
    3. Beef      Mutton
    4. Milk       Pork
13. The diagram below shows some livestock parasites.
    
    Which one of the following methods would be the best to control the parasites above?
    1. Dipping
    2. Spraying
    3. Rotational grazing
    4. Deworming
14. Which one of the following is an advantage of using organic manure?
    1. Supplies specific nutrients in the soil
    2. Increase the soil drainage.
    3. Required in small amount
    4. Remains useful in the soil for along time
15. To investigate the properties of soil a group of std 6 pupils performed the experiment below.
    
    Soil P can be used for
    1. Making the longest ribbons
    2. Constructing buildings
    3. Farming
    4. Modelling
16. Which of the following is not a method of rotational grazing?
    1. Tethering
    2. Stall feeding
    3. Paddocking
    4. Strip grazing.
17. All the following are signs of gum disease except
    1. shedding of deciduous teeth
    2. bleeding gums
    3. red and swollen gums
    4. bad breath
18. Farm tools can be maintained in all the following ways except
    1.  sharpening cutting tools.
    2. oiling.
    3. proper storage.
    4. using the tools regularly.
19. Which one of the following effects of soil erosion are as a result of gully erosion?
    1. Absence of the top layer of the soil 
    2. Formation of small channels
    3. V-shaped trenches
    4. Small holes on the ground
20. The diagram below shows two pupils balancing on a seesaw
    
    Which of the following statement is correct?
    1. Peter should sit closer to the fulcrum in order to balance John
    2. They cannot be able to balance
    3. They should be at the same distance from the fulcrum to balance 
    4. John should sit closer to the fulcrum to balance Peter
21. Which one of the following factors make a nail to sink in the water but piece of wood to float on water?
    1. Size
    2. Weight.
    3. Type of material
    4. Shape
22. The chart below represents a simple classification of liquids
    
    Which liquids are represented by X and Y?
    1. Petrol.                 Water
    2. Cooking oil         Diesel
    3. Turpentine          Milk
    4. Milk                     Cooking oil
23. Which one of the following groups of materials consists only of materials that are magnetic?
    1. Staples pins stee! wool,tin can
    2. Copper wire,bottle top,aluminium foil 
    3. Silver coin,razor blade,scissors
    4. Pieces of zin,spoon,copper coin
24. The pie chart below represents the components of air
    
    Which two parts represents gases forming approximately 78% of air in the atmosphere?
    1. F and H
    2. E and G
    3. F and G
    4. G and H
25. The thread like substances found in some food are very helpful in our bodies as they
    1. help to dissolve food
    2. help to digest food
    3. add extra nutrients
    4. help to empty bowels
26. Which one of the following consists of a pair which is both modern and traditional method of preserving food?
    1. Use of low temperature and salting
    2. Drying and use of low temperature 
    3. Smoking and refrigeration
    4. Drying and salting
27. Which of the following pairs of processes occurs when temperature increases?
    1. Melting and Expansion
    2. Expansion and contraction
    3. Condensation and evaporation
    4. Freezing and condensation
28. Which one of the following are both reasons for lighting a house?
    1. Warming and discouraging pest
    2. Safety and reading comfortably
    3. Encouraging pest and seeing clearly 
    4. Safety and drying
29. In a certain investigation pupils were blindfolded, stood in a circle. One pupil stood in the centre and rang the bell as they listened. What aspect of sound was being investigated?
    1. Soft and loud sounds
    2. Meaning of special sound 
    3. Direction of sound
    4. Effects of sound pollution
30. The diagram below represents a set-up that can be used to investigate good and poor conductors of electricity.
    
    Which one of the following pairs of materials can be fitted in the gap to make the bulb light?
    1. Razor blade and wet twig
    2. Glass and graphite
    3. Chalk and steel wool
    4. Dry wood and aluminium foil
31. Which one of the following is not a way of reducing the force that opposes motion?
    1. Lubrication
    2. Smoothening surfaces
    3. Increasing treads
    4. Using rollers
32. The following are ways in which water is used in industries except
    1. manufacturing of soft drinks 
    2. making pulp
    3. cooling machines
    4. sport fishing
33. Which one of the following does not describe a way of drug misuse?
    1. Taking someone else medicine
    2. Taking preventive medicine 
    3. Taking sleeping pills to relax
    4. Taking an overdose
34. Which one of the following shows a pair of water-borne diseases?
    1. Typhoid and cholera
    2. Malaria and bilharzia
    3. Common cold and cholera
    4. Cholera and malaria
35. in a certain investigation a pupil observed a candle flame through different materials one at a time and recorded the findings. What aspect of light was being investigated?
    1. Reflection of light
    2. light travel in a straight line
    3. Passage of light through materials
    4. Dispersion
36. Which one of the following groups of food consists only of sources of nutrients that protect the body against diseases?
    1. Pigweed, spinach, tomatoes 
    2. Groundnuts, potatoes, liver
    3. Kales, fish, beef
    4. Cassava, sugarcane, avocado
37. Which one of the following consists only of substances that have no definite shape but has definite size?
    1. Sand, paraffin, smoke
    2. toothpaste, soda, glue
    3. Nitrogen, cement, water vapour 
    4. Stone, wood, flour
38. Which one of the following pairs of levers have the same position of effort, load and fulcrum when in use?
    1. Wheel barrow and claw hammer
    2. Spade and clawbar
    3. Claw hammer and seesaw
    4. Crowbar and wheelbarrow
39. Which of the following STIs causes painful skin rush and can be transmitted to foetus during -pregnancy?
    1. Chancroid
    2. Gonorrhoea
    3. HIV and AIDS
    4. Syphilis
40. The correct order of the planets listed below starting with the closest to the sun is
    1. Saturn, Uranus, Jupiter, Neptune 
    2. Neptune, Uranus, Jupiter, Saturn 
    3. Jupiter, Saturn, Uranus, Neptune
    4. Uranus, Neptune, Saturn, Jupiter
41. Which one of the following does not affect the accuracy of the rainguage when measuring the rain water collected?
    1. The diameter of the collecting jar
    2. The material used to make the container
    3. The diameter of the funnel
    4. The distance between the markings on the collecting jar
42. The HIV is transmitted from an infected person to a healthy person mainly through
    1. body fluids
    2. sexual intercourse
    3. kissing
    4. blood transfusion
43. Which one of the following is not a way of controlling water pollution?
    1. Planting cover vegetation and terracing
    2. Storing water in porous dams
    3. Practicing proper hygiene
    4. Clearing accidental oil spills soonest possible
44. Which one of the following groups consists of only diseases that are immunizable?
    1. Typhoid, Pertusis, Bilharzia
    2. Malaria, Polio, Cholera
    3. Tetanus, Measles, HIV
    4. Cholera, Tuberculosis, Typhoid
45. Clouds are classified according to the following except
    1. distance
    2. height
    3. shape
    4. appearance
46. When wet tea leaves are put in a glass of cold water and heated at the bottom, the wet tea leaves are seen to rise and fall. This is because wet tea leaves
    1. become lighter than water when heated
    2. rise when heated and come down on cooling
    3. are carried by hot water which come down on cooling
    4. and water rise when heated and come down on cooling.
47. Which one of the following materials is not required when investigating that light travels in a straight line?
    1. Match box
    2. Nail
    3. Candle
    4. Mirror
48. Which one of the following is not a major component of environment? 
    1. Rare gases
    2. Algae
    3. Light 
    4. Sand
49. Circular plates of the same size were arranged in a pile as shown in the diagram below.
    
    When the bottom plate was knocked suddenly using a ruler, it moved out leaving the pile intact. The pile remained intact because of
    1. weight
    2. inertia
    3. friction
    4. gravity
50. Which one of the following pairs consists of only soil components that are invisible?
    1. Water and air
    2. Mineral particles and humus
    3. Water and humus
    4. Humus and air

MARKING SCHEME

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