MCQ
Action and reaction:
- AAlways act on two different bodies
- BAre equal in magnitude
- CAct in opposite directions
- DAll the above
Explanation:
Newton's third law of motion: For every action there is always an equal and opposite reaction acting on the other body.
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| Elperiment number | Mass of H2 reacted | Mass of o2 reacted | Mass of H2Oproduced |
| 1 | 2g | 16g | 18g |
| 2 | 4g | 32g | 36g |
| 3 | - | - | 9g |
Whose living cells provide tensile and mechanical strength?
The hardness of the bone tissue is due to the phosphates and carbonates of: