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## Uncertainty in Measurement MCQs

**1. A piece of iron is 5 inches long. How much would it be in centimeters?**

a) 12.7 cm

b) 6.35 cm

c) 5 cm

d) 500 cm

**Answer: **12.7 cm

**2. How many significant figures does 0.057 have?**

a) 2

b) 4

c) 3

d) 0

**Answer: **2

**3. How many significant figures does 63180 have?**

a) 5

b) 4

c) 1

d) 2

**Answer: **4

**4. The exact value is 150m. A students record it as 140.1m in 1st turn and 140.8m in the 2nd turn. Comment his/her recordings.**

a) precise

b) accurate

c) neither precise nor accurate

d) both precise and accurate

**Answer: **precise

**5. The exact value is 150m. A students record it as 149.1m in 1st turn and 150.8m in the 2nd turn. Comment his/her recordings.**

a) precise

b) accurate

c) neither precise nor accurate

d) both precise and accurate

**Answer: **accurate

**6. Multiply 1.2 and 3.91. Obtain the result as per the rules of significant figures.**

a) 4.692

b) 4.69

c) 5

d) 4.7

**Answer: **4.7

**7. How many significant figures are there in 60.6?**

a) 4

b) 2

c) 3

d) 1

**Answer: **3

**8. Write 6354000000 in scientific notation.**

a) 6.354 x 10^{9}

b) 6354 x 10^{6}

c) 0.64 x 10^{10}

d) 6354000 x 10^{3}

**Answer: **6.354 x 10^{9}^{}

**9. _________ is referred to as the closeness of different measurements for the same quantity.**

a) Accuracy

b) Precision

c) Analysis

d) Dimension

**Answer: **Precision

**10. How many seconds are there in a half day?**

a) 86,400 seconds

b) 43,200 seconds

c) 172,800 seconds

d) 3660 seconds

**Answer: **43,200 seconds