The main constituent of the air is.
- ✓nitrogen
- Boxygen
- Ccarbon dioxide
- Dhydrogen
Answer: A.
View full solution →77 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
[1 Marks Each] M.C.Q.
10 Q→02[1 Marks Each] Blanks
9 Q→03True Or False.[1 Marks Each]
12 Q→04Write the definition: [ 1 M]
3 Q→05[1 Marks Each] QUE - ANS
22 Q→06Answer The Following Questions In Short.[2 Marks Each]
14 Q→07[3 Marks Each] QUE-ANS
1 Q→08Match The Following.[4 Marks Each]
2 Q→09[5 Marks Each] QUE-ANS
4 Q→One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Answer: A.
View full solution →Answer: B.
View full solution →Answer: D.
View full solution →Answer: B.
View full solution →Answer: A.
View full solution →| $1$ | A device that shows the ********* of air | $(a)$ Glider |
| $2$ | ***** harmful gases **** smoke away from us | $(b)$ Mountaineer |
| $3$ | Keeps oxygen cylinder with him | $(c)$ ******* cock |
| $4$ | A ***** that ***** in the air without an engine | $(d)$ Long chimney |
| $1$ | Oxygen | $(a)$ Useful in photosynthesis |
| $2$ | Nitrogen | $(b)$ Useful in water cycle |
| $3$ | Carbon dioxide | $(c)$ ****** in respiration |
| $4$ | ***** vapour | $(d)$ Highest proportion in air |
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