10 questions · Form 4 Physics Bab 1: Physical Quantities and Measurements
Which of the following derived quantities is correctly matched with its SI base units?
Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.
1. Which of the following derived quantities is correctly matched with its SI base units?
Answer: A
Pressure = Force / Area = kg m s⁻²m² = kg m⁻¹ s⁻².
2. Which of the following physical quantities is a derived vector quantity?
Answer: D
Momentum (p = mv) is derived from mass and velocity, and possesses direction.
3. The power output of an engine is 2.5 kW. What is this value expressed in Watts (W)?
Answer: B
kilo (k) prefix represents 10³. 2.5 × 10³ W = 2500 W.
4. Convert a speed of 72 km h⁻¹ into SI base units (m s⁻¹).
Answer: A
72 km h⁻¹ = 72 × 1000 m3600 s = 20 m s⁻¹.
5. A vector quantity is defined as a physical quantity that has:
Answer: D
Vector quantities require both numerical magnitude and a spatial direction.
6. Convert a density of 13.6 g cm⁻³ into SI base units (kg m⁻³).
Answer: C
To convert g cm⁻³ to kg m⁻³, multiply by 1000: 13.6 × 1000 = 13,600 kg m⁻³.
7. If momentum = mass × velocity, what are the SI base units for momentum?
Answer: A
Unit of mass = kg, Unit of velocity = m s⁻¹. Therefore, kg m s⁻¹.
8. Which of the following is the SI base unit for luminous intensity?
Answer: A
The SI base unit for luminous intensity is the candela (cd).
9. Which of the following is an SI base quantity?
Answer: B
Thermodynamic temperature is one of the seven base quantities in the SI system.
10. What is the SI base unit for mass?
Answer: C
The SI base unit for mass is the kilogram (kg).