HOMEWORK SET 1&2 CH100A

1. What is the number of significant figures in 0.010720?

2. What is the number of significant figures in 90.00?

3.  What is the number of significant figures in 9002?

4. What is the number of significant figures in 706000?

5. The answer to the following problem should be rounded off to  ?  significant figures.

12 + 97 + 11

6. The answer to the following problem should be rounded off to  ?  significant figures.

67.20 - 62.013

7. The answer to the following problem should be rounded off to  ?  significant figures.

 

 

117.20 + 3.2 - 33.29

8. The answer to the following problem should be rounded off to  ?  significant figures.

(119.2 - 107.3) (2.611)
              1001

9. The answer to the following problem should be rounded off to  ?  significant figures.

 

 

5.00002/2.000000

10. The answer to the following problem should be rounded off to  ?  significant figures.

 

 

(7.210*10⁵)(3.2000*10⁹)

11. (10² * 10^-7) =

a. 10^-1       b. 10¹
c. 10^-5       d. 10⁵
e. 10^-9

12. (5.5 * 10⁵)(6.0 * 10¹⁵)

         (2.1 * 10³)

a. 1.5 * 10²³      b. 1.6 * 10²¹
c. 1.5 * 10¹⁸      d. 1.5 * 10¹⁹
e. 1.6 * 10¹⁸

13. (4.60 * 10^-7)(3.027 * 10^-9)=


a. 1.4 * 10^-15    b. 1.4 * 10^-2
c. 1.39 * 10¹⁵  d. 1.39 * 10^-16
e. none of these

14. (7.431 * 10⁴) - (6.43 * 10^-3)

a. 6.78 * 10⁴    b. 6.788 * 10⁴
c. 6.79 * 10⁴    d. 6.78 * 10^-4
e. none of these

15. (7.222 * 10⁴) + (3.39 * 10²)=


a. 7.25 * 10⁴   b. 7.26 * 10⁴
c. 7.25 * 10⁶   d. 7.256 * 10⁶
e. 7.256 * 10⁴
 

16. Which of the following terms refers to how close a measurement comes to the true value?


a. significant figures.    b. random errors.
c. systematic errors.    d. accuracy.
e. precision

17. Which of the following terms refers to the reproducibility of a measurement?


a. significant figures.   b. random errors.
c. systematic errors. d. accuracy.
e. precision.

18. Which of the following instruments can measure volume most precisely?


a. a beaker.      b. a shot glass
c. a coffee cup. d. a 50mL graduated cylinder
e. a 50mL burette

19. Which of the following is not a physical science?


a. astronomy     b. geology
c. physics          d. zoology
e. chemistry
 

20. The count of the number of students in the room is classified as a  ?  number.


a. measured. b. defined. c. both measure & defined. 
d. neither measured or defined
e. more information is needed.