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ICSE Class 8 Physics Question 11 of 11

Physical Quantities and Measurement — Question 2

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Question

Question 1(b)

The relative density of alcohol is 0.8. Its density is:

  1. 0.8
  2. 800 kg m-3
  3. 800 g cm-3
  4. 0.8 kg m-3
Answer

800 kg m-3

Reason —

Relative density of alcohol=Density of alcoholDensity of water0.8=Density of alcohol1000 kg m−3Density of alcohol=0.8×1000=800 kg m−3\text{Relative density of alcohol} = \dfrac{\text{Density of alcohol}}{\text{Density of water}} \\[1em] \text{0.8} = \dfrac{\text{Density of alcohol}}{\text{1000 kg m}^{-3}} \\[1em] \text{Density of alcohol} = 0.8 \times 1000 = {\text{800 kg m}^{-3}}