Physics 9 Chapter 1 - Physical Quantities and Measurements - 22

Physics 9 Chapter 1 - Physical Quantities and Measurements - 22

1. Every measurement of a quantity is an attempt to find its ..................value?

a) False
b) Incorrect
c) True
d) Estimated

2. What are significant figures?

a) All the accurately known digits and all doubtful digits
b) All the digits
c) All the accurately known digits and first doubtful digit
d) All the accurately known digits

3. Upon which of the following factors, the accuracy in measuring a physical quantity depends?

a) All are correct
b) The quality of the measuring instrument
c) The skill of the observer
d) The number of observations made

4. Upon which of the following factors, the accuracy in measuring a physical quantity depends?

a) The length of the measuring instrument
b) The width of the measuring instrument
c) The quantity of the measuring instrument
d) The quality of the measuring instrument

5. Upon which of the following factors, the accuracy in measuring a physical quantity depends?

a) The quantity of apparatus used
b) The number of conclusions drawn
c) None of these
d) The number of observations made

6. How many significant figures are in 18cm?

a) None
b) Two
c) One
d) Three

7. What is the exactly known digit in 18cm?

a) 8
b) 0.18
c) 1
d) Centimetre

8. What is the doubtful digit in 18cm?

a) 1
b) 8
c) 0.18
d) Centimetre

9. By which of the following instrument, the length of the book might be18cm?

a) Measuring tape
b) Metre rule
c) Screw gauge
d) Vernier callipers

10. By which of the following instrument, the number of significant figures measured would be two?

a) Vernier callipers
b) Measuring tape
c) Metre rule
d) Screw gauge

11. By which of the following instrument, the length of the book might be18.4cm?

a) Screw gauge
b) Ruler
c) Measuring tape
d) Vernier callipers

12. How many significant figures are in 18.4cm?

a) Two
b) Three
c) One
d) All the digits are significant

13. How many are the exactly known digit in 18.4cm?

a) Two
b) One
c) All
d) Three

14. How many are the doubtful digit in 18.4cm?

a) One
b) Two
c) All
d) Three

15. What is the doubtful digit in 18.4cm?

a) 4
b) 8
c) Centimetre
d) 1

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