1.Which of the following statements about heat is correct?
A. It is possessed by an object with a high temperature.
B. It is absorbed by an object with a high temperature.
C. It is the transfer of thermal energy from a hot object to a cold object.
D. It is the transfer of thermal energy from a cold object to a hot object.

2.The temperature of object A is 90 0 C and object B is 30 0 C. What will be the direction of the flow of heat between these two objects if they are in direct contact?
A. The heat will flow from object A to object B.
B. The heat will flow from object B to object A.
C. The heat will flow either from object A or object B.
D. Heat transfer will not occur between these two objects.





7. What is the condition necessary for heat transfer to happen between two substances

or objects?

A. Difference in density



B. Difference in temperature



C. Movement of fluids


D. Movement of particles


8.What happens to the density of air as its temperature increases?

A. Its density decreases.

B. Its density increases.

C. Its density does not change.

D. Its density can either increase or decrease.



9. How does the heat of the sun reach the earth?

A. through conduction


B. though convection
C. through radiation
D. through conduction and convection

10.What happens to the warm air and cold air during the process of convection?

A. Warm air sinks and cold air rises.

B. Warm air rises and cold air sinks.

C. Both the warm air and cold air rise.

D. Both the warm air and cold air sink
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