F.4 Physics Transfer Processes

1. Which of the following statements is/are correct?
(1) Conduction is the transfer of heat from objects with higher internal energy to objects with lower internal energy.
(2) During Convection, hot air rises because it possess higher internal energy than cool air.
(3) Internal energy is a measure of the extent of molecular motions and interactions.
A (2) only
B (3) only
C (1) AND (2) only
D (1) and (3) only

2. No wind will be generated by an electric fan in vacuum because:
A. conduction of the movement of moleculars is poor
B. there is no air
C. movement of molecules in vacuum is limited even when a fan is turned on.
D. radiation comes from hot objects only but not from cold objects.

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