MCQ
Which of the following explains why air is not visible?
- AIt is nearly a perfect transparent substance.
- ✓It neither absorbs nor reflects light.
- CIt transmits whole of light.
- DAll of these.
✓
Answer
Correct option: B.
It neither absorbs nor reflects light.
An object is visible, when it either absorbs light or reflects light. Air is not visible because it neither absorbs nor reflects light.
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Direction: The questions in this segment consists of two statements, one labelled as 'Assertion $A$' and the other labelled as 'Reason $R$'. You are to examine these two statements carefully and decide if the Assertion $A$ and Reason $R$ are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below.
Assertion $A$: The change of water from liquid to steam on heating is a physical change.
Reason $R$: Conversion of liquid into steam is called evaporation.
→Assertion $A$: The change of water from liquid to steam on heating is a physical change.
Reason $R$: Conversion of liquid into steam is called evaporation.
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
Starch is a kind of: