Queations on Units of Length
Units of Length – Grade 6
Multiple-Choice Questions
1. Which of the following is the basic unit of length in the metric system?
A) Inch
B) Centimeter
C) Meter
D) Foot
E) Millimeter
2. How many centimeters are in 1 meter?
A) 10
B) 100
C) 1,000
D) 1
E) 1,500
3. What is the most appropriate unit to measure the height of a door?
A) Millimeter
B) Kilometer
C) Meter
D) Centimeter
E) Inch
4. Which is the smallest unit of length among the options below?
A) Centimeter
B) Inch
C) Foot
D) Millimeter
E) Meter
5. How many millimeters are there in 1 centimeter?
A) 10
B) 100
C) 1,000
D) 0.1
E) 0.01
6. Which unit is best to measure the distance between two cities?
A) Centimeter
B) Meter
C) Millimeter
D) Kilometer
E) Foot
7. How many millimeters are in 1 meter?
A) 10
B) 100
C) 1,000
D) 10,000
E) 0.1
8. Which of these units is not part of the metric system?
A) Kilometer
B) Centimeter
C) Foot
D) Meter
E) Millimeter
9. A pencil is about 18 cm long. What other unit could you use to describe this?
A) 0.18 mm
B) 1.8 m
C) 180 mm
D) 18 m
E) 18 km
10. What tool would you use to measure the length of a classroom?
A) Thermometer
B) Measuring tape
C) Stopwatch
D) Beaker
E) Scale
11. The length of a nail is best measured in:
A) Kilometers
B) Meters
C) Centimeters
D) Inches
E) Liters
12. How many meters are there in 1 kilometer?
A) 10
B) 100
C) 500
D) 1,000
E) 10,000
13. What is the symbol for centimeter?
A) cm
B) mm
C) c
D) mcm
E) cc
14. A rope is 2.5 meters long. How many centimeters is that?
A) 25 cm
B) 250 cm
C) 2,500 cm
D) 0.25 cm
E) 2,000 cm
15. Which unit is most suitable to measure the width of a finger?
A) Kilometer
B) Meter
C) Centimeter
D) Millimeter
E) Foot
16. How many centimeters are in 5.6 meters?
A) 56
B) 560
C) 5.6
D) 0.56
E) 5,600
17. Which of the following units is most appropriate to measure a book’s thickness?
A) Kilometer
B) Centimeter
C) Meter
D) Liter
E) Kilogram
18. What is the symbol for millimeter?
A) cm
B) m
C) mm
D) ml
E) mn
19. Which is the correct conversion:
A) 1 km = 10,000 m
B) 1 m = 1,000 mm
C) 1 cm = 1,000 mm
D) 1 mm = 100 cm
E) 1 m = 100 mm
20. The length of a football field is best measured in:
A) Millimeters
B) Centimeters
C) Kilometers
D) Meters
E) Inches
Answer Key with Explanations
1. C) Meter – The meter is the basic unit of length in the metric system.
2. B) 100 – 1 meter = 100 centimeters.
3. C) Meter – A door is roughly 2 meters tall.
4. D) Millimeter – The smallest standard unit among the options.
5. A) 10 – 1 cm = 10 mm.
6. D) Kilometer – Kilometers are used for long distances.
7. C) 1,000 – 1 meter = 1,000 millimeters.
8. C) Foot – "Foot" is from the imperial system.
9. C) 180 mm – 18 cm × 10 = 180 mm.
10. B) Measuring tape – Best for measuring larger spaces.
11. C) Centimeters – Nails are small and typically measured in cm.
12. D) 1,000 – 1 kilometer = 1,000 meters.
13. A) cm – Standard abbreviation for centimeter.
14. B) 250 cm – 2.5 m × 100 = 250 cm.
15. C) Centimeter – Most appropriate for this body part.
16. B) 560 – 5.6 × 100 = 560 centimeters.
17. B) Centimeter – A book’s thickness is best measured in cm.
18. C) mm – Standard symbol for millimeter.
19. B) 1 m = 1,000 mm – This is the correct metric conversion.
20. D) Meters – Football fields are usually 90–100 meters long.
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