Q84 of 125 Page 38

Measurement made in science lab must be as accurate as possible. Ravi measured the length of an iron rod and said it was 19.34 cm long; Kamal said 19.25 cm; and Tabish said 19.27 cm. The correct length was 19.33 cm. How much of error was made by each of the boys?

Correct length of rod, C = 19.33 cm


Length reported by Ravi, R = 19.34 cm



Length reported by Kamal, K = 19.25 cm



Length reported by Tabish, T = 19.27 cm



Error made by Ravi = R – C



Error made by Kamal = K – C



Error made by Tabish = T – C



∴ Error made by Ravi, Kamal and Tabish is 0.01cm, -0.08cm and -0.06 cm respectively.


More from this chapter

All 125 →
82

Meteorology: One measure of average global temperature shows how each year varies from a base measure. The table shows results for several years.


See the table and answer the following:


a) Order the five years from coldest to warmest.


b) In 1946, the average temperature varied by –0.030C from the base measure. Between which two years should 1946 fall when the years are ordered from coldest to warmest?

 83

In her science class, Jyoti learned that the atomic weight of Helium is 4.0030; of Hydrogen is 1.0080; and of Oxygen is 16.0000. Find the difference between the atomic weights of:

a) Oxygen and Hydrogen


b) Oxygen and Helium


c) Helium and Hydrogen

 85

When 0.02964 is divided by 0.004, what will be the quotient?

 86

What number divided by 520 gives the same quotient as 85 divided by 0.625?