General Knowledge - General Science
Exercise :: General Science - Elements and Metals
| 16. |
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is |
Answer: Option C
Explanation:
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| 17. |
The gases used in different types of welding would include |
| A. |
oxygen and hydrogen | | B. |
oxygen, hydrogen, acetylene and nitrogen | | C. |
oxygen, acetylene and argon | | D. |
oxygen and acetylene |
Answer: Option D
Explanation:
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| 18. |
The property of a substance to absorb moisture from the air on exposure is called |
| A. |
osmosis | | B. |
deliquescence | | C. |
efflorescence | | D. |
desiccation |
Answer: Option B
Explanation:
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| 19. |
In which of the following activities silicon carbide is used? |
| A. |
Making cement and glass | | B. |
Disinfecting water of ponds | | C. |
cutting very hard substances | | D. |
Making casts for statues |
Answer: Option C
Explanation:
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| 20. |
The average salinity of sea water is |
Answer: Option B
Explanation:
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