The presence of a gravitational field is required for the heat transfer by:
1. radiation
2. conduction
3. stirring of liquids
4. natural convection
Subtopic:  Convection |
 75%
From NCERT
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In a room containing air, heat can go from one place to another:
1. by conduction only
2. by convection only
3. by radiation only
4. by all three modes

Subtopic:  Convection |
 63%
From NCERT
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