AFOQT Physical Science Principles 2 ā Questions and Answers
Question 1: A 10 kg object accelerates at 3 m/sĀ². What net force acts on it?
- 3 N
- 13 N
- 30 N (Correct answer)
- 0.3 N
Correct answer: 30 N
Force equals mass times acceleration, so 10 kg Ć 3 m/sĀ² = 30 N.
Question 2: Which form of energy is stored in a stretched spring?
- Kinetic energy
- Thermal energy
- Elastic potential energy (Correct answer)
- Nuclear energy
Correct answer: Elastic potential energy
A stretched or compressed spring stores elastic potential energy.
Question 3: What happens to the wavelength of a wave if its frequency increases while speed stays constant?
- Wavelength increases
- Wavelength decreases (Correct answer)
- Wavelength stays the same
- Wavelength becomes zero
Correct answer: Wavelength decreases
Since speed = frequency Ć wavelength, a higher frequency at constant speed means a shorter wavelength.
Question 4: Which of these is a chemical change rather than a physical change?
- Melting ice
- Boiling water
- Rusting iron (Correct answer)
- Crushing a can
Correct answer: Rusting iron
Rusting forms a new substance (iron oxide), making it a chemical change.
Question 5: What is the SI unit of electric current?
- Volt
- Watt
- Ampere (Correct answer)
- Ohm
Correct answer: Ampere
The ampere is the SI unit of electric current.
Question 6: An object at rest stays at rest unless acted on by a force. This describes which law?
- Newton's first law (Correct answer)
- Newton's second law
- Newton's third law
- Law of gravitation
Correct answer: Newton's first law
Newton's first law, the law of inertia, states objects resist changes in motion.
Question 7: Which subatomic particle carries a negative charge?
- Proton
- Neutron
- Electron (Correct answer)
- Nucleus
Correct answer: Electron
Electrons carry a negative electric charge.
AFOQT Physical Science Principles 2
A 10 kg object accelerates at 3 m/sĀ².
What net force acts on it?