Stemscopes Exam Physical Science 2 — Questions and Answers
Question 1: Which form of heat transfer does NOT require matter?
- Conduction
- Convection
- Radiation (Correct answer)
- Evaporation
Correct answer: Radiation
Radiation transfers heat through electromagnetic waves and can travel through a vacuum without matter.
Question 2: What is the law of conservation of energy?
- Energy can be created but not destroyed
- Energy can be destroyed but not created
- Energy cannot be created or destroyed, only transformed (Correct answer)
- Energy is always lost as heat
Correct answer: Energy cannot be created or destroyed, only transformed
The law of conservation of energy states that energy cannot be created or destroyed, only converted from one form to another.
Question 3: A ball rolling down a ramp converts which type of energy into kinetic energy?
- Chemical potential energy
- Gravitational potential energy (Correct answer)
- Elastic potential energy
- Nuclear energy
Correct answer: Gravitational potential energy
As the ball descends, gravitational potential energy is converted into kinetic energy.
Question 4: Which of the following is an example of a conductor?
- Rubber
- Wood
- Copper wire (Correct answer)
- Plastic
Correct answer: Copper wire
Copper wire is a conductor because free electrons in copper allow electrical current to flow easily.
Question 5: What does the pitch of a sound wave depend on?
- Amplitude
- Frequency (Correct answer)
- Speed
- Wavelength only
Correct answer: Frequency
Pitch is determined by the frequency of the sound wave; higher frequency produces higher pitch.
Question 6: In which state of matter do particles have the most energy?
- Solid
- Liquid
- Gas
- Plasma (Correct answer)
Correct answer: Plasma
Plasma particles have the highest kinetic energy as electrons are stripped from atoms, but among common states, gas particles have the most energy after plasma.
Stemscopes Exam Physical Science 2
Which form of heat transfer does NOT require matter?