Tag: measurement of properties

Questions Related to 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


Correct Option: B

How many significant figures are present in $7 \times 2.232$?

  1. $5$

  2. $3$

  3. $4$

  4. $1$


Correct Option: A
Explanation:

$7 \times 2.232=15.624$

Number of significant figures= $5$

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

  1. $1$

  2. $2$

  3. $3$

  4. $4$

  5. $5$


Correct Option: E
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 $124.04g$.

How many significant digits does the measurement $0.0384g$ possess?

  1. $1$

  2. $2$

  3. $3$

  4. $4$

  5. $5$


Correct Option: C
Explanation:

The significant digits in the number $0.0384g$ are $3,8$ and $4$. Therefore, the number of significant digits are $3$.

Which of the following numbers has 1 significant figure?

  1. 0.060

  2. 0.60

  3. 6.0

  4. 60


Correct Option: D
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 $\text{D}$

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.


Correct Option: A
Explanation:

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

Round 984 liters to 2 significant digits.

  1. $1.00\times10^3$ liters

  2. 1000 liters

  3. 900 liters

  4. 980 liters


Correct Option: D
Explanation:

$\text{980 have two non-zero digits ie. with significant figure is 2.}$

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


Correct Option: C
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

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. $3737 m^3$


Correct Option: A
Explanation:

Side of a cube$=7.203m$

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