AFOQT Physical Science Principles 3 — Questions and Answers
Question 1: How much work is done lifting a 5 N weight a vertical height of 2 m?
- 2.5 J
- 7 J
- 10 J (Correct answer)
- 0 J
Correct answer: 10 J
Work equals force times distance, so 5 N × 2 m = 10 J.
Question 2: Which type of heat transfer occurs through direct contact between particles?
- Convection
- Conduction (Correct answer)
- Radiation
- Evaporation
Correct answer: Conduction
Conduction transfers heat through direct particle-to-particle contact.
Question 3: What is the density of a 200 g object with a volume of 50 cm³?
- 2 g/cm³
- 4 g/cm³ (Correct answer)
- 0.25 g/cm³
- 250 g/cm³
Correct answer: 4 g/cm³
Density equals mass divided by volume: 200 g ÷ 50 cm³ = 4 g/cm³.
Question 4: In a chemical equation, what must be equal on both sides?
- The temperature
- The number of atoms of each element (Correct answer)
- The number of molecules
- The volume of gas
Correct answer: The number of atoms of each element
The law of conservation of mass requires equal atoms of each element on both sides.
Question 5: Two resistors of 4 Ω each are connected in series. What is the total resistance?
- 2 Ω
- 4 Ω
- 8 Ω (Correct answer)
- 16 Ω
Correct answer: 8 Ω
Series resistances add directly, so 4 Ω + 4 Ω = 8 Ω.
Question 6: What property of a wave determines its loudness for sound?
- Frequency
- Wavelength
- Amplitude (Correct answer)
- Speed
Correct answer: Amplitude
A sound wave's amplitude determines its loudness or intensity.
Question 7: Which state of matter has a definite volume but no definite shape?
- Solid
- Liquid (Correct answer)
- Gas
- Plasma
Correct answer: Liquid
Liquids have a fixed volume but take the shape of their container.
AFOQT Physical Science Principles 3
How much work is done lifting a 5 N weight a vertical height of 2 m?