Quiz Chapter 1: Physical Quantities and Measurements

1. Convert a speed of 72 km h⁻¹ into SI base units (m s⁻¹).

1. 20 m s⁻¹
2. 200 m s⁻¹
3. 25 m s⁻¹
4. 15 m s⁻¹

2. A graph of resistance R against 1A (cross-sectional area) yields a straight line passing through the origin. How is R related to A?

1. R is directly proportional to A
2. R increases linearly with A
3. R is inversely proportional to A
4. R is independent of A

3. Which set contains ONLY scalar quantities?

1. Displacement, speed, mass
2. Velocity, acceleration, force
3. Time, mass, energy, temperature
4. Weight, density, area, speed

4. What is the SI base unit for mass?

1. Gram (g)
2. Tonne (t)
3. Kilogram (kg)
4. Milligram (mg)

5. Which of the following is the SI base unit for luminous intensity?

1. Candela (cd)
2. Lumen (lm)
3. Lux (lx)
4. Watt (W)

6. A vector quantity is defined as a physical quantity that has:

1. Magnitude only
2. Direction only
3. Neither magnitude nor direction
4. Both magnitude and direction

7. In a physics experiment, keeping room temperature constant throughout all trials ensures that temperature acts as a:

1. Manipulated variable
2. Responding variable
3. Constant variable
4. Random variable

8. What quantity is represented by the gradient of a velocity-time graph?

1. Acceleration
2. Displacement
3. Momentum
4. Force

9. Which base unit combination is equivalent to 1 Joule (J) of energy?

1. kg m s⁻²
2. kg m² s⁻²
3. kg m⁻¹ s⁻²
4. kg m² s⁻³

10. Which of the following derived quantities is correctly matched with its SI base units?

1. Pressure: kg m⁻¹ s⁻²
2. Force: kg m s⁻¹
3. Density: kg m⁻²
4. Work: kg m s⁻²