Q1. Which of the following gives more precise measurement of time
A
B
Q2. Which of the following is more precise unit of measurement, 23mm or 23cm
Q3. Given measurement of 120 feet, what is the greatest possible error?
Q4. Given measurement of 12.32 cm, what is the greatest possible error?
Q5. Given measurement of 0.256 cm, what is the greatest possible error?
Q6. Find area of a rectangle whose dimensions are 2.3 cm
1.62cm, using the correct
number of significant digits in the answer.
Q7. Find area of a triangle whose base is 13.3 cm and 11.62cm, using the correct number of
significant digits in the answer.
Q8. Find area of a triangle whose base is 42.32 cm and 21.62cm, using the correct number
of significant digits in the answer.
Q9. The length of a rectangle is 6.34 cm and its width is 2.3 cm. Using the correct number of
significant digits in the answer, what is the perimeter of the given rectangle.
Q10. Which of the following is more precise unit of measurement? Explain
3.4 km or 3 km
Q11. Find the number of significant digits in
i.
ii.
5.122
34700
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Q12. Which of the following is more precise unit of measurement?
i.
ii.
4 cm ; 4.3 cm
4 kg ; 16 g
Q13. Which of the following is more precise unit of measurement?
i.
ii.
5 yards; 10 feet
40 m; 40.1 m
Q14. To measure height of the given building, which is the appropriate unit of
measurement?
Meter or centimeter
Q15. Define accuracy and precision?
Q16. Find area of a rectangle whose dimensions are 9.32 cm
10.0cm, using the correct
number of significant digits in the answer.
Q17. Given measurement of 12000 cm, what is the greatest possible error?
Q18. To measure fuel in the tank of plane, which is the appropriate unit of measurement?
Why?
Gallons or liters
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Q19. To measure speed of a car, which is the appropriate unit of measurement? Why?
Centimeters per minute or kilometers per hour
Q20. Find the greatest possible error while rounding a measurement 500 cm to the nearest
hundred cm.
Answers:
A1. watch B
A2. 23mm
A3. ±5
A4. ±0.005
A5. ±0.0005
A6. 3.7 cm2
A7. 77.3 cm2
A8. 457.5 cm2
A9. 17 cm
A10. 3.4 km
A11.
i.
ii.
4
3
A12.
i.
ii.
4.3 cm
16 g
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A13.
i.
ii.
10 feet
40.1 m
A14. Meter
A15. Accuracy: It is how close the measured value to the actual (true) value is.
Precision: It is ability of the measurement to be consistently reproduced. Precise
measurements are close to each other.
A16. 93 cm2
A17. ±500
A18. Gallons
A19. Kilometres per hour
A20. ±50
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