Question
A hole is drilled in a metal plate.
What happens to the length of the plate and to the diameter of the hole when the plate is cooled?
| length of plate | diameter of hole |
A | decreases | decreases |
B | decreases | increases |
C | increases | decreases |
D | increases | increases |
Answer/Explanation
Ans: A
Question
A solid is heated causing it to expand.
What effect does this have on its mass and on its density?
|
mass |
density |
|
|
A |
decreases |
decreases |
|
B |
decreases |
stays constant |
|
C |
stays constant |
decreases |
|
D |
stays constant |
stays constant |
Answer/Explanation
Ans: CQuestion
Which quantity does not change when there is an increase in temperature?
A the density of a steel block
B the diameter of the hole in a metal nut
C the length of an iron rod
D the mass of a metal coin
Answer/Explanation
Ans: D
Question
A heater supplies 80 J of energy to a block of metal. The temperature of the block rises by 20 °C.
What happens to the block of metal when its temperature falls by 10 °C?
A. Its internal energy decreases by 40 J.
B. Its internal energy decreases by 160 J.
C. Its internal energy increases by 40 J.
D. Its internal energy increases by 160 J.
Answer/Explanation
Ans: A
Question
An engineer wants to fix a steel washer on to a steel rod. The rod is just too big to fit into the hole
of the washer.
How can the engineer fit the washer on to the rod?
A. Cool the washer and put it over the rod.
B. Cool the washer and rod to the same temperature and push them together.
C. Heat the rod and then place it in the hole.
D. Heat the washer and then place it over the rod.
Answer/Explanation
Ans: D