Significant figures — NEET & JEE Questions

Question 1 · difficulty L1 · recall

How many significant figures are present in the measured value 0.00450?

• A. 3
• B. 2
• C. 4
• D. 5

Question 2 · difficulty L2 · understanding

In multiplication or division of measured quantities, the final result should generally contain

• A. the same number of significant figures as the factor with the fewest significant figures
• B. the same number of decimal places as the first number
• C. all calculator digits
• D. one significant figure regardless of data

Question 3 · difficulty L2 · understanding

In addition or subtraction of measured quantities, the result is normally rounded to

• A. the least precise decimal place among the inputs
• B. the fewest significant figures regardless of decimal places
• C. the greatest number of decimal places
• D. an integer in every case

Question 4 · difficulty L2 · understanding

Which zeros are always significant in a recorded decimal measurement?

• A. Zeros between nonzero digits
• B. Leading zeros before the first nonzero digit
• C. All zeros before a decimal point regardless of notation
• D. No zeros are ever significant

Question 5 · difficulty L3 · understanding

Each side of a metallic cube of mass 5.580 kg is measured to the 9.0 cm . Keeping the significant figures in view, the density of the material of the cube can be best expressed as $X \times 10^3 \mathrm{~kg} \mathrm{~m}^{-3}$ where the value of $X$ is:

• A. 7.654
• B. 7.6
• C. 7.65
• D. 7.7

Question 6 · difficulty L3 · understanding

The diameter of a spherical bob, when measured with vernier callipers yielded the following values : $$3.33 \mathrm{~cm}, 3.32 \mathrm{~cm}, 3.34 \mathrm{~cm}, 3.33 \mathrm{~cm}$$ and $$3.32 \mathrm{~cm}$$. The mean diameter to appropriate significant figures is :

• A. $$3.328 \mathrm{~cm}$$
• B. $$3.3 \mathrm{~cm}$$
• C. $$3.33 \mathrm{~cm}$$
• D. $$3.32 \mathrm{~cm}$$

Question 7 · difficulty L3 · understanding

The area of a rectangular field (in m 2 ) of length 55.3 m and breadth 25 m after rounding off the value for correct significant digits is

• A. 138 $$\times$$ 10 1
• B. 1382
• C. 1382.5
• D. 14 $$\times$$ 10 2

Question 8 · difficulty L3 · understanding

Taking into account of the significant figures, what is the value of $$9.99 m - 0.0099m$$?

• A. 9.98 m
• B. 9.980 m
• C. 9.9 m
• D. 9.9801 m

Question 9 · difficulty L4 · application

What is $2.34\times1.2$ expressed with the correct number of significant figures?

• A. 2.8
• B. 2.81
• C. 2.808
• D. 3.0

Question 10 · difficulty L4 · application

What is $12.11+0.3$ expressed with appropriate precision?

• A. 12.4
• B. 12.41
• C. 12.410
• D. 12