Tag: chemistry

Questions Related to chemistry

significant number in 0.002930

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 6

  2. 5

  3. 4

  4. 3

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Correct Option: C

Which of the following values possess maximum number of significent zeros?

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. $0.00007$

  2. $0.00070$

  3. $20.000$

  4. $0.800$

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Correct Option: C

After rounding off 1.235 and 1.225, we will have their answers respectively as 

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 1.23, 1.22

  2. 1.24 , 1.23

  3. 1.23 , 1.23

  4. 1.24 , 1.22

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Correct Option: D

Which among the following measurements contains the highest number of significant figures? 

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. $1.123 \times 10^{-3}kg$

  2. $1.2 \times 10^{-3}kg$

  3. $0.123 \times 10^{3}kg$

  4. $2 \times 10^{5}kg$

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Correct Option: A

The correctly reported answer of the addition of 4.523, 2.3 and 6.24 will have significant figures

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 2

  2. 3

  3. 4

  4. 5

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Correct Option: A

314.000 has how many significant figures.

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 6

  2. 3

  3. 5

  4. 4

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Correct Option: A

How many significant figures in 0.00025 ?

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 6

  2. 3

  3. 4

  4. 2

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Correct Option: D

Number of significant figures in $ 2000\times 10^2$ is ____ .

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. 6

  2. 1

  3. 4

  4. Infinite

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Correct Option: A

The number of significant figure in $\pi$ are:

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. Three

  2. Infinite number

  3. Zero

  4. One

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Correct Option: B

Which of the following has two significant figures?

chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

  1. $0.070$

  2. $0.70$

  3. $7.0$

  4. $70$

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Correct Option: A,B,C
Explanation:


Leading Zeroes are not significant because these zeroes only serve as space holder. They are there to put decimal point in correct location. Trailing zeroes in a number containing decimal point are significant.

Leading zeroes in whole number are never significant so 70 has only 1 significant figure.

So, option A, B and C are correct.