Entry Exam Category: Graduate & Professional Program Admission Exams
Course: Praxis
Exam: Praxis Elementary Science 5005 Practice Test
Practice Question
Which of the following is the best way to measure the volume of an irregularly shaped solid, such as a rock?
Answer Choices
- A: Use a balance to measure the mass of the rock and divide by its density.
- B: Place the rock in a graduated cylinder containing water and measure the change in water level.
- C: Use a ruler to measure the length, width, and height of the rock and multiply them together.
- D: Use a stopwatch to measure how long it takes the rock to fall a certain distance and calculate its volume from its speed.
Correct Answer: B
Rationale: Displacement method: Volume = water level change. A: Needs density. C: For regular shapes. D: Measures time, not volume. Displacement accurate for irregulars.