Tag: measurement of properties

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

Given the numbers $786$, $0.786$ and $0.0786$. The number significant figures for the numbers is :

  1. $3$, $4$ and $5$ respectively
  2. $3$, $3$ and $3$ respectively
  3. $3$, $3$ and $4$ respectively
  4. $3$, $4$ and $4$ respectively
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For 786, all three digits are significant. For 0.786, leading zeros are not significant, so there are 3. For 0.0786, leading zeros are not significant, so there are 3.

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

How many significant digits does the measurement $124.04g$ possess?

  1. $1$
  2. $2$
  3. $3$
  4. $4$
  5. $5$
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The number of single digits that are important in the coefficient of an expression in scientific notation is termed as significant number.

The significant digits in the given number are $1,2,4,0$ and $4$. Therefore, $5$ significant digits are there in the number $124.04g$.

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

Which of the following numbers has 1 significant figure?

  1. 0.060

  2. 0.60

  3. 6.0

  4. 60
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

There are three rules on determining how many significant figures are in a number: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.


Hence, only option D has one significant figure and all others have 2 significant figures.

Hence, the correct option is $\text{D}$

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

All of the following are good laboratory practices except_________.

  1. Wait for a hot object to cool before weighing it.

  2. Rinse a burette with the solution that will be used to fill the times

  3. Wear goggles at all times

  4. Return unused chemicals to the reagent bottles
  5. To dilute $H _2SO _4$, pour it into water slowly.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We use different equipment to cool the object, before weighting it which save time.

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

The result of the operation 2.5 X 1.25 should be which of the following on the basis of significant figures?

  1. 3.125

  2. 3.13

  3. 3.1

  4. 31.25
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
$2.5 \times 1.25 = 3.125$

The rule says: Answer to a multiplication or division should be rounded off to a same number of significant figures as possessed by the least precise term in the calculation.

Since $2.5$ has least numbers of significant figure i.e.two, thus, the result should have 2 significant figure i.e. $ 3.1$
option C is correct
Multiple choice chemistry measurement and data processing and analysis uncertainties and errors, graphical techniques uncertainty in measurement measurement of properties

Each side of a cube is measured to be $7.203$ m. What is the volume of the cube to appropriate significant figure?

  1. $373.7m^3$
  2. $311.3 m^3$
  3. $211.3 m^3$
  4. $3737 m^3$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Side of a cube$=7.203m$

                        $={(7.203)}^3$
                        $=373.714m^3$
$\therefore$  Volume of a cube $=373.7m^3$