SAT Subject Physics Practice Question 581: Answer and Explanation
7. If the pressure acting on an ideal gas that is kept at constant temperature is multiplied by four, its volume
B. reduces to 1/3.
C. increases by four.
D. reduces to 1/4.
E. There is not enough information to tell.
Correct Answer: D
The correct answer is (D). An ideal gas follows Boyle's law. If the pressure increases by a factor of four, the volume decreases by a factor of four. Whatever the change in one, the other is indirectly related by the same factor.