Science Objective Questions and Answers: All topics
Explore reliable objective questions for All topics tailored for Class 8 learners. Utilizing these Science multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Download All topics MCQs with Answers
Access the complete set of multiple-choice questions for All topics below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.
MCQs 1-17: Crop Production and Management
1. The crops grown in the rainy season are called
(a) Kharif crops (b) Rabi crops (c) cash crops (d) none of these
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Answer: (a) Kharif crops
Teacher's Note: Use the key term in your answer.
2. Which is not a rabi crop?
(a) wheat (b) potato (c) rice (d) mustard
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Answer: (c) rice
Teacher's Note: Give an example if the question allows.
3. The process of loosening and turning the soil is
(a) ploughing (b) levelling (c) manuring (d) none of these
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Answer: (a) ploughing
Teacher's Note: Write a short, clear answer.
4. What is used to level the ploughed land?
(a) leveller (b) hoe (c) plough (d) cultivator
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Answer: (a) leveller
Teacher's Note: Remember this for your exam.
5. Which is a plantation crop?
(a) Tea (b) coffee (c) rubber (d) all of these
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Answer: (d) all of these
Teacher's Note: Learn this point and write it in your own words.
6. Leguminous plants replenish the soil with
(a) oxygen (b) nitrogen (c) hydrogen (d) carbon dioxide
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Answer: (b) nitrogen
Teacher's Note: Use the key term in your answer.
7. Which is not a traditional method of irrigation?
(a) moat (b) drip (c) dhekli (d) rahat
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Answer: (b) drip
Teacher's Note: Give an example if the question allows.
8. The soil which needs the least frequent irrigation is
(a) sandy (b) clayey (c) rocky (d) loamy
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Answer: (b) clayey
Teacher's Note: Write a short, clear answer.
9. Which crop needs standing water?
(a) wheat (b) rice (c) cotton (d) maize
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Answer: (b) rice
Teacher's Note: Remember this for your exam.
10. The science of breeding, feeding and caring for domestic animals is
(a) animal husbandry (b) breeding (c) horticulture (d) none of these
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Answer: (a) animal husbandry
Teacher's Note: Learn this point and write it in your own words.
11. Urea is a
(a) fertilizer (b) compost (c) manure (d) none of these
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Answer: (a) fertilizer
Teacher's Note: Use the key term in your answer.
12. Rhizobium bacteria are found in the ____ of leguminous plants
(a) leaves (b) stem (c) root nodules (d) flowers
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Answer: (c) root nodules
Teacher's Note: Give an example if the question allows.
13. Microbes are seen through a
(a) microscope (b) telescope (c) periscope (d) none of these
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Answer: (a) microscope
Teacher's Note: Write a short, clear answer.
14. Chlamydomonas belongs to the group
(a) bacteria (b) viruses (c) algae (d) fungi
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Answer: (c) algae
Teacher's Note: Remember this for your exam.
15. The smallest microorganisms are
(a) bacteria (b) viruses (c) algae (d) fungi
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Answer: (b) viruses
Teacher's Note: Learn this point and write it in your own words.
16. Lactobacillus bacteria help make
(a) bread (b) pastries (c) cake (d) curd
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Answer: (d) curd
Teacher's Note: Use the key term in your answer.
17. The microbe that helps make idli and dosa is
(a) bacteria (b) yeast (c) viruses (d) algae
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Answer: (b) yeast
Teacher's Note: Give an example if the question allows.
MCQs 18-35: Microorganisms
18. The disease eradicated from most parts of the world is
(a) polio (b) tetanus (c) smallpox (d) tuberculosis
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Answer: (c) smallpox
Teacher's Note: Write a short, clear answer.
19. Which microbes help decompose waste organic matter?
(a) algae (b) bacteria (c) fungi (d) both a and c
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Answer: (b) bacteria
Teacher's Note: Bacteria and fungi are the decomposers. Algae are not, so option (d) is not correct.
20. The vaccine for protection against tuberculosis is
(a) BCG (b) DPT (c) DDT (d) polio booster dose
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Answer: (a) BCG
Teacher's Note: Learn this point and write it in your own words.
21. Malaria is caused by
(a) viruses (b) bacteria (c) protozoa (d) fungi
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Answer: (c) protozoa
Teacher's Note: Use the key term in your answer.
22. Viruses cause
(a) dengue fever (b) tetanus (c) ringworm (d) anthrax
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Answer: (a) dengue fever
Teacher's Note: Give an example if the question allows.
23. The first scientist to describe microorganisms was
(a) Edward Jenner (b) Louis Pasteur (c) Alexander Fleming (d) Antonie van Leeuwenhoek
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Answer: (d) Antonie van Leeuwenhoek
Teacher's Note: Write a short, clear answer.
24. A biological nitrogen fixer is
(a) housefly (b) fungi (c) blue-green algae (d) protozoa
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Answer: (c) blue-green algae
Teacher's Note: Remember this for your exam.
25. Smut disease in plants is caused by
(a) fungi (b) bacteria (c) protozoa (d) viruses
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Answer: (a) fungi
Teacher's Note: Learn this point and write it in your own words.
26. Which microorganisms lack chlorophyll and take nutrition from decaying matter?
(a) virus (b) algae (c) protozoa (d) fungi
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Answer: (d) fungi
Teacher's Note: Use the key term in your answer.
27. The conversion of nitrates into free nitrogen gas is
(a) nitrification (b) denitrogenation (c) denitrification (d) none of these
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Answer: (c) denitrification
Teacher's Note: Give an example if the question allows.
28. Which non-metal catches fire on exposure to air?
(a) phosphorus (b) nitrogen (c) sulphur (d) hydrogen
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Answer: (a) phosphorus
Teacher's Note: Write a short, clear answer.
29. An organism that converts atmospheric nitrogen into a soluble form is
(a) fungi (b) algae (c) Rhizobium (d) virus
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Answer: (c) Rhizobium
Teacher's Note: Remember this for your exam.
30. A metal which is liquid at room temperature is
(a) sodium (b) mercury (c) potassium (d) none of these
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Answer: (b) mercury
Teacher's Note: Learn this point and write it in your own words.
31. Metals that are not very reactive and occur free in nature are
(a) alloys (b) noble metals (c) metalloids (d) mixtures
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Answer: (b) noble metals
Teacher's Note: Use the key term in your answer.
32. Which metal does not react with cold or hot water?
(a) Na (b) Ca (c) Mg (d) Fe
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Answer: (d) Fe
Teacher's Note: Give an example if the question allows.
33. Which non-metal is lustrous?
(a) sulphur (b) oxygen (c) nitrogen (d) iodine
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Answer: (d) iodine
Teacher's Note: Write a short, clear answer.
34. Which metal cannot displace hydrogen from a dilute acid?
(a) iron (b) zinc (c) silver (d) calcium
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Answer: (c) silver
Teacher's Note: Remember this for your exam.
35. Iron is electroplated with
(a) chromium (b) nickel (c) aluminium (d) all of these
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Answer: (d) all of these
Teacher's Note: Learn this point and write it in your own words.
MCQs 36-50: Metals, Non-metals and Mixed
36. Conversion of nitrates into free nitrogen gas is called
(a) nitrification (b) denitrogenation (c) denitrification (d) none of these
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Answer: (c) denitrification
Teacher's Note: Use the key term in your answer.
37. Large-scale storage of grains is done in
(a) tanks (b) bins (c) silos (d) drums
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Answer: (c) silos
Teacher's Note: Give an example if the question allows.
38. Iron can be displaced by which metal?
(a) copper (b) lead (c) sodium (d) tin
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Answer: (c) sodium
Teacher's Note: Sodium is more reactive than iron.
39. Ringworm is caused by
(a) algae (b) fungus (c) bacteria (d) protozoa
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Answer: (b) fungus
Teacher's Note: Remember this for your exam.
40. Urea is a
(a) fertilizer (b) compost (c) manure (d) none of these
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Answer: (a) fertilizer
Teacher's Note: Learn this point and write it in your own words.
41. The non-metal which is liquid at room temperature is
(a) chlorine (b) bromine (c) iodine (d) carbon
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Answer: (b) bromine
Teacher's Note: Use the key term in your answer.
42. Which metal forms a protective layer on its surface by reacting with air?
(a) iron (b) zinc (c) silver (d) aluminium
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Answer: (d) aluminium
Teacher's Note: Give an example if the question allows.
43. Which microorganism has animal-like characteristics?
(a) fungi (b) protozoa (c) virus (d) all of these
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Answer: (b) protozoa
Teacher's Note: Protozoa are the animal-like microbes; option (b) in the printed list is 'virus' and (c) is 'protozoa'.
44. Which microorganism has animal-like characteristics?
(a) fungi (b) virus (c) protozoa (d) all of these
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Answer: (c) protozoa
Teacher's Note: Remember this for your exam.
45. A symbiotic nitrogen-fixing microorganism is
(a) Azospirillum (b) Rhizobium (c) Clostridium (d) Nitrococcus
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Answer: (b) Rhizobium
Teacher's Note: Learn this point and write it in your own words.
46. The conversion of ammonia to nitrite and then to nitrate is
(a) nitrification (b) ammonification (c) assimilation (d) denitrification
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Answer: (a) nitrification
Teacher's Note: Use the key term in your answer.
47. Bronze is made up of
(a) Cu and Zn (b) Zn and Ni (c) Cu and Sn (d) Cu, Zn and Sn
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Answer: (c) Cu and Sn
Teacher's Note: Give an example if the question allows.
48. Non-metals are generally
(a) liquids (b) gases (c) solids and gases (d) gases and liquids
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Answer: (c) solids and gases
Teacher's Note: Write a short, clear answer.
49. The solution of the ash of magnesium ribbon is
(a) acidic (b) basic (c) neutral (d) all of these
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Answer: (b) basic
Teacher's Note: Remember this for your exam.
50. Which metal is present in calcium hydroxide?
(a) C (b) O (c) Ca (d) H
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Answer: (c) Ca
Teacher's Note: Learn this point and write it in your own words.
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FAQs
You can get most exhaustive CBSE Class 8 Science MCQs Crop Production Microorganisms and Metals and Non-metals Set 01 for free on StudiesToday.com. These MCQs for Class 8 Science are updated for the 2026-27 academic session as per CBSE examination standards.
Yes, our CBSE Class 8 Science MCQs Crop Production Microorganisms and Metals and Non-metals Set 01 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.
By solving our CBSE Class 8 Science MCQs Crop Production Microorganisms and Metals and Non-metals Set 01, Class 8 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Science.
Yes, Science MCQs for Class 8 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.
Yes, you can also access online interactive tests for CBSE Class 8 Science MCQs Crop Production Microorganisms and Metals and Non-metals Set 01 on StudiesToday.com as they provide instant answers and score to help you track your progress in Science.