Puzzles Class 9 Measurement

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Measurement Puzzles

Measurement Puzzles

1. Match the SI Units

Match the following physical quantities with their correct SI units:

  • Length → (a) kelvin, (b) metre, (c) kilogram
  • Mass → (a) second, (b) metre, (c) kilogram
  • Time → (a) second, (b) kelvin, (c) ampere
Think about basic quantities like weight and distance.
  • Length → metre
  • Mass → kilogram
  • Time → second

2. Fill in the Blank

The SI unit of electric current is ______.

It starts with 'A'.
ampere

3. Identify the Instrument

Which instrument is used to measure the diameter of a small sphere?

It is more precise than a ruler.
Vernier Caliper

4. Error Classification

What type of error is caused by faulty calibration of an instrument?

Think of a predictable error that occurs consistently.
Systematic Error

5. Significant Figures

How many significant figures are in 0.00456?

Ignore the leading zeros.
3 Significant Figures

6. Spot the Error

If 4.0 m × 2.0 m = 8.00 m², what is wrong with the significant figures?

The result should have the least number of significant figures.
The result should be 8.0 m².

7. Conversion Puzzle

Convert 5 kilometers to meters.

1 kilometer = 1000 meters.
5000 meters

8. Multiple Choice

Which of the following is not an SI base unit?
(a) kelvin
(b) gram
(c) second
(d) ampere

It’s related to mass but not the standard unit.
gram

9. True or False

The SI unit of luminous intensity is candela. True or False?

It starts with 'C'.
True

10. Instrument Reading

If the vernier scale reading is 0.03 mm and the main scale reading is 10 mm, what is the total measurement?

Add the main scale and vernier scale readings.
10.03 mm

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