40 Objectival Questions SCIENCE (8th) For Practice Exam 2023
1. The name of the process of converting sugar into alcohol is–
(a) Nitrogen fixation
(b) Moulding
(c) Fermentation
(d) Transition
Answer– Fermentation.
2. Paddy is mainly grown in which season?
(a) Winter
(b) summer
(c) rainy season
(d) Spring season
Answer– Rainy season.
3. Which of these microorganisms are only hosts?
(a) virus
(b) Protozoa
(c) Algae
(d) fungus
Ans- Virus.
4. Which of the following substances is required for the manufacture of manure?
(a) Dung
(b) plant remains
(c) human waste
(d) all of the above
Ans- All of the above.
5. Which of the following is not needed by green plants to make their own food?
(a) Sunlight
(b) Carbon dioxide
(c) Water
(d) Nitrogen
Answer– Nitrogen.
6. Which of the following resource is man-made?
(a) Water
(b) Air
(c) Sunlight
(d) plastic
Ans– Plastic.
7. Alcohol is produced with the help of a microorganism called .................
(a) Lactobacillus
(b) House fly
(c) Yeast
(d) Rhizobium
Ans– Yeast.
8. Bacteria called .............. convert milk into curd.
(a) Lactobacillus
(b) House fly
(c) Yeast
(d) Rhizobium
Ans– Lactobacillus.
9. Which of the following gases is responsible for acid rain?
(a) Sulfur Di Oxygen
(b) Nitrous oxide
(c) Nitrogen dioxide
(d) all of the above
Ans- All of the above.
10. Which of the following is an antibiotic?
(a) sodium bicarbonate
(b) Streptomycin
(c) alcohol
(d) Yeast
Ans– Streptomycin.
11. The number of nuclei found in a zygote is–
(a) none
(b) a
(c) two
(d) four
Answer– A.
12. The sources of human food are–
(a) trees and plants
(b) animal-animals
(c) both of the above
(d) neither
Ans- Both of the above.
13. Which of the following is a renewable natural resource–
(a) Sunlight
(b) Natural gas
(c) Petroleum
(d) Coal
Answer– Sunlight.
14. Why are CNG and LPG used?
(a) Because they are less polluting.
(b) Because it is a clean fuel.
(c) Because they are easily available.
(d) all of the above
Ans- All of the above.
15. In the process of combustion ____________ are produced.
(a) heat
(b) Light
(c) both of the above
(d) neither
Ans- Both of the above.
16. Which of the following is a type of combustion–
(a) explosion
(b) spontaneous combustion
(c) rapid combustion
(d) all of the above
Ans- All of the above.
17. .......... gas is required for combustion.
(a) Oxygen
(b) Carbon dioxide
(c) Nitrogen
(d) Hydrogen
Ans– Oxygen.
18. Which of the following substances does not burn?
(a) Wood
(b) Paper
(c) Iron nails
(d) Kerosene
Answer– Iron nails.
19. The minimum temperature at which a substance starts burning is called its ...........
(a) ignition temperature
(b) fuel temperature
(c) calorific value
(d) none of these
Answer– ignition temperature.
20. The process of turning and loosening the soil is called.............
(a) Weeding
(b) Irrigation
(c) plowing
(d) harvesting
Answer– Ploughing.
21. Which of the following is not a Kharif crop?
(a) Paddy
(b) Mecca
(c) Cotton
(d) gram
Answer– Gram.
22. By which of the following method the weeds are separated at the time of harvest?
(a) Weeding
(b) Irrigation
(c) plowing
(d) harvesting
Answer– Weeding.
23. Microorganisms can be seen with the help of ...........
(a) Microscope
(b) Visionary
(c) both of the above
(d) neither
Ans– Microscope.
24. …………….. means found in a particular area variety of living beings.
(a) Deforestation
(b) Biodiversity
(c) Sanctuary
(d) National Industry
Ans– Biodiversity.
25. Cholera is caused by …………….
(a) Fungi
(b) Algae
(c) Protozoa
(d) Bacteria
Ans– Bacteria.
26. The main cause of communicable diseases is–
(a) Ant
(b) House fly
(c) Dragonfly
(d) Spider
Answer– House fly.
27. Which of the following is not a communicable disease?
(a) Cholera
(b) Polio
(c) cold-cold
(d) Tuberculosis
Ans– Polio.
28. The reason why bread or idli swell is–
(a) heat
(b) grinding
(c) growth of yeast cells
(d) due to beating
Ans– growth of yeast cells.
29. Which of the following resource is not obtained by refining petroleum?
(a) Petroleum gas
(b) Kerosene
(c) Electricity
(d) Diesel
Ans– Electricity.
30. Which of the following is a fossil fuel?
(a) Coal
(b) Petroleum
(c) both of the above
(d) neither
Ans- Both of the above.
31. Blue-green algae fix ................ from the air, which in turn Fertility increases.
(a) Oxygen
(b) Hydrogen
(c) Nitrogen
(d) Neon
Answer– Nitrogen.
32. Watering the crop at proper time and interval is called..................
(a) Weeding
(b) Irrigation
(c) plowing
(d) harvesting
Ans– Irrigation.
33. The temperature of inflammable substances is .................
(a) Very few
(b) less
(c) more
(d) too much
Answer– Very few.
34. Incomplete combustion of fuel produces toxic ................ gas.
(a) Carbon monoxide
(b) Carbon dioxide
(c) Sulfur dioxide
(d) Nitrous oxide
Answer– Carbon monoxide.
35. Which of the following is not a fuel?
(a) Wood coal
(b) Kerosene
(c) Minerals
(d) Petrol
Answer– Minerals.
36. The carrier of malarial parasite is–
(a) Female Anopheles mosquito
(b) Cockroach
(c) House fly
(d) Butterfly
Ans– Female Anopheles mosquito.
37. Which of the following gas is responsible for global warming?
(a) Carbon dioxide
(b) Sulfur Di Oxygen
(c) Nitrous oxide
(d) Carbon monoxide
Answer– carbon dioxide.
38. The process by which a tadpole develops into an adult is–
(a) fertilization
(b) metamorphosis
(c) Budding
(d) planting
Answer– Metamorphosis.
39. Where are microorganisms used?
(a) in making alcohol
(b) In making medicine
(c) in making food items
(d) all of the above
Ans- All of the above.
40. Which of the following substances does not burn?
(a) piece of stone
(b) Wood coal
(c) Plastic
(d) Match sticks
Answer– piece of stone.
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R F Temre
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