alleryA metal key is used to scratch wood, chalk and stone. What property is being tested?
ASolubility
BHardness
CTransparency
DVolume
Answer & Solution
Correct answer: B. Hardness
1. Scratching shows which materials give way more easily.
2. Materials that scratch easily are soft and those that resist are hard.
3. The test says nothing about dissolving, light passing or space occupied.
_Source: NCERT Curiosity Class 6 Science, Ch 6, 6.3.2 Which materials are hard?_
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