9th class Physics, Chapter 1: Physical Quantities and Measurements MCQs

1. The instrument that is most suitable for measuring the thickness of a few sheets of cardboard is a:

1. (A) metre rule
2. (B) measuring tape
3. (C) Vernier Callipers
4. (D) micrometer screw gauge ✓

2. One femtometre is equal to:

1. (A) 10⁻⁹ m
2. (B) 10⁻¹⁵ m ✓
3. (C) 10⁹ m
4. (D) 10¹⁵ m

3. A light year is a unit of:

1. (A) light
2. (B) time
3. (C) distance ✓
4. (D) speed

4. Which one is a non-physical quantity?

1. (A) distance
2. (B) density
3. (C) colour ✓
4. (D) temperature

5. When using a measuring cylinder, one precaution to take is to:

1. (A) check for the zero error
2. (B) look at the meniscus from below the level of the water surface
3. (C) take several readings by looking from more than one direction
4. (D) position the eye in line with the bottom of the meniscus ✓

6. Volume of water consumed by you per day is estimated in:

1. (A) millilitre
2. (B) litre ✓
3. (C) kilogram
4. (D) cubic metre

7. A displacement can is used to measure:

1. (A) mass of a liquid
2. (B) mass of a solid
3. (C) volume of a liquid
4. (D) volume of a solid ✓

8. Two rods with lengths 12.321 cm and 10.3 cm are placed side by side, the difference in their lengths is:

1. (A) 2.02 cm
2. (B) 2.0 cm ✓
3. (C) 2 cm
4. (D) 2.021 cm

9. Four students measure the diameter of a cylinder with Vernier Callipers. Which of the following readings is correct?

1. (A) 3.4 cm
2. (B) 3.475 cm
3. (C) 3.47 cm ✓
4. (D) 3.5 cm

10. Which of the following measures is likely to represent the thickness of a sheet of this book?

1. (A) 6 × 10⁻²⁵ m
2. (B) 1 × 10⁻⁴ m ✓
3. (C) 1.2 × 10⁻¹⁵ m
4. (D) 4 × 10⁻² m

11. In a Vernier Callipers ten smallest divisions of the Vernier scale are equal to nine smallest divisions of the main scale. If the smallest division of the main scale is half millimetre, the Vernier constant is equal to:

1. (A) 0.5 mm
2. (B) 0.1 mm
3. (C) 0.05 mm ✓
4. (D) 0.001 mm

12. Does a non-physical quantity have dimensions?

1. (A) No ✓
2. (B) Yes, length only
3. (C) Yes, time only
4. (D) Yes, all three dimensions

13. 100 m is equal to:

1. (A) 1000 μm
2. (B) 1000 cm
3. (C) 100 000 mm ✓
4. (D) 1 km

14. Which of the following is a physical quantity?

1. (A) Wisdom
2. (B) Beauty
3. (C) Length ✓
4. (D) Love

15. Which of the following cannot be measured using an instrument?

1. (A) Density
2. (B) Fear ✓
3. (C) Time
4. (D) Temperature

16. A physical quantity is expressed by:

1. (A) a number only
2. (B) a unit only
3. (C) a name and a symbol
4. (D) a magnitude and a unit ✓

17. The temperature of a body is measured with a:

1. (A) ruler
2. (B) balance
3. (C) thermometer ✓
4. (D) clock

18. Which of the following is a derived quantity?

1. (A) Speed ✓
2. (B) Length
3. (C) Mass
4. (D) Time

19. Quantities chosen arbitrarily by scientists to play a key role in physics are called:

1. (A) scalar quantities
2. (B) base quantities ✓
3. (C) derived quantities
4. (D) non-physical quantities

20. Density of a material is described in terms of:

1. (A) length and time
2. (B) mass and time
3. (C) length and mass
4. (D) mass and volume ✓