QBManager

Units and Measurements

139920 The radius of a circular plate is $1.05 m$ . Its area (in $m^{2}$ ) up to correct significant figures is

1 3.47

2 3.475

3 3.467

4 3.82

5 3.825

Explanation:

A Radius of circle (R) $= 1.05 m$
Area of Circle $= π R^{2}$
$= \frac{22}{7} \times (1.05)^{2}$
Number of significant in 3.465 should be equal to number of significant radius 3.47 in area (up to correct significant figures).

Kerala CEE 2021

Units and Measurements

139923 Taking into account of the significant figures, what is the value of $9.99 m - 0.0099 m$ ?

1

9.98 m

2

9.980 m

3

9.9 m

4

9.9801 m

Explanation:

A $\begin{array}{r} 9.9900 \\ - 0.0099 \\ 9.9801 \end{array}$
Since least number of significant figure present in given numbers in 2 , hence,
$9.99 m - 0.0099 m = 9.98 m$

NEET (Sep.) 2020

Units and Measurements

139938 The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{- 3}$ are

1

5, 1, 2

2

5, 1, 5

3

5, 5, 2

4

4, 4, 2

Explanation:

A Number of significant figures for 23.023 is 5 .
Number of significant figures for 0.0003 is 1
Number of significant figures for $2.1 \times 10^{- 3}$ is 2 .
Therefore, the correct sequence is $5, 1, 2$ .

AIEEE 2010

Units and Measurements

139940 The number of significant figures in the numbers $4.8000 \times 10^{4}$ and 48000.50 are respectively

1 5 and 6

2 5 and 7

3 2 and 7

4 2 and 6

Explanation:

B All the non digits are significant. Power of 10 is irrelevant for the determination of significant figures. Hence, $4.8000 \times 10^{4}$ has five significant figures.
Also, all the zeros between two non-zero digits are significant. Hence, 48000.50 has 7 significant figures.
Explanation-No. of significant figures in $4.8000 \times 10^{4}$
$= (4, 8, 0, 0, 0)$ [ 5 significant figures]
No. of significant figures in 48000.50 $= (4, 8, 0, 0, 0, 5, 0)$ [7 significant figures]

Manipal UGET-2009

Units and Measurements

139920 The radius of a circular plate is $1.05 m$ . Its area (in $m^{2}$ ) up to correct significant figures is

1 3.47

2 3.475

3 3.467

4 3.82

5 3.825

Explanation:

A Radius of circle (R) $= 1.05 m$
Area of Circle $= π R^{2}$
$= \frac{22}{7} \times (1.05)^{2}$
Number of significant in 3.465 should be equal to number of significant radius 3.47 in area (up to correct significant figures).

Kerala CEE 2021

Units and Measurements

139923 Taking into account of the significant figures, what is the value of $9.99 m - 0.0099 m$ ?

1

9.98 m

2

9.980 m

3

9.9 m

4

9.9801 m

Explanation:

A $\begin{array}{r} 9.9900 \\ - 0.0099 \\ 9.9801 \end{array}$
Since least number of significant figure present in given numbers in 2 , hence,
$9.99 m - 0.0099 m = 9.98 m$

NEET (Sep.) 2020

Units and Measurements

139938 The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{- 3}$ are

1

5, 1, 2

2

5, 1, 5

3

5, 5, 2

4

4, 4, 2

Explanation:

A Number of significant figures for 23.023 is 5 .
Number of significant figures for 0.0003 is 1
Number of significant figures for $2.1 \times 10^{- 3}$ is 2 .
Therefore, the correct sequence is $5, 1, 2$ .

AIEEE 2010

Units and Measurements

139940 The number of significant figures in the numbers $4.8000 \times 10^{4}$ and 48000.50 are respectively

1 5 and 6

2 5 and 7

3 2 and 7

4 2 and 6

Explanation:

B All the non digits are significant. Power of 10 is irrelevant for the determination of significant figures. Hence, $4.8000 \times 10^{4}$ has five significant figures.
Also, all the zeros between two non-zero digits are significant. Hence, 48000.50 has 7 significant figures.
Explanation-No. of significant figures in $4.8000 \times 10^{4}$
$= (4, 8, 0, 0, 0)$ [ 5 significant figures]
No. of significant figures in 48000.50 $= (4, 8, 0, 0, 0, 5, 0)$ [7 significant figures]

Manipal UGET-2009

Units and Measurements

139920 The radius of a circular plate is $1.05 m$ . Its area (in $m^{2}$ ) up to correct significant figures is

1 3.47

2 3.475

3 3.467

4 3.82

5 3.825

Explanation:

A Radius of circle (R) $= 1.05 m$
Area of Circle $= π R^{2}$
$= \frac{22}{7} \times (1.05)^{2}$
Number of significant in 3.465 should be equal to number of significant radius 3.47 in area (up to correct significant figures).

Kerala CEE 2021

Units and Measurements

139923 Taking into account of the significant figures, what is the value of $9.99 m - 0.0099 m$ ?

1

9.98 m

2

9.980 m

3

9.9 m

4

9.9801 m

Explanation:

A $\begin{array}{r} 9.9900 \\ - 0.0099 \\ 9.9801 \end{array}$
Since least number of significant figure present in given numbers in 2 , hence,
$9.99 m - 0.0099 m = 9.98 m$

NEET (Sep.) 2020

Units and Measurements

139938 The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{- 3}$ are

1

5, 1, 2

2

5, 1, 5

3

5, 5, 2

4

4, 4, 2

Explanation:

A Number of significant figures for 23.023 is 5 .
Number of significant figures for 0.0003 is 1
Number of significant figures for $2.1 \times 10^{- 3}$ is 2 .
Therefore, the correct sequence is $5, 1, 2$ .

AIEEE 2010

Units and Measurements

139940 The number of significant figures in the numbers $4.8000 \times 10^{4}$ and 48000.50 are respectively

1 5 and 6

2 5 and 7

3 2 and 7

4 2 and 6

Explanation:

B All the non digits are significant. Power of 10 is irrelevant for the determination of significant figures. Hence, $4.8000 \times 10^{4}$ has five significant figures.
Also, all the zeros between two non-zero digits are significant. Hence, 48000.50 has 7 significant figures.
Explanation-No. of significant figures in $4.8000 \times 10^{4}$
$= (4, 8, 0, 0, 0)$ [ 5 significant figures]
No. of significant figures in 48000.50 $= (4, 8, 0, 0, 0, 5, 0)$ [7 significant figures]

Manipal UGET-2009

Units and Measurements

139920 The radius of a circular plate is $1.05 m$ . Its area (in $m^{2}$ ) up to correct significant figures is

1 3.47

2 3.475

3 3.467

4 3.82

5 3.825

Explanation:

A Radius of circle (R) $= 1.05 m$
Area of Circle $= π R^{2}$
$= \frac{22}{7} \times (1.05)^{2}$
Number of significant in 3.465 should be equal to number of significant radius 3.47 in area (up to correct significant figures).

Kerala CEE 2021

Units and Measurements

139923 Taking into account of the significant figures, what is the value of $9.99 m - 0.0099 m$ ?

1

9.98 m

2

9.980 m

3

9.9 m

4

9.9801 m

Explanation:

A $\begin{array}{r} 9.9900 \\ - 0.0099 \\ 9.9801 \end{array}$
Since least number of significant figure present in given numbers in 2 , hence,
$9.99 m - 0.0099 m = 9.98 m$

NEET (Sep.) 2020

Units and Measurements

139938 The respective number of significant figures for the numbers $23.023, 0.0003$ and $2.1 \times 10^{- 3}$ are

1

5, 1, 2

2

5, 1, 5

3

5, 5, 2

4

4, 4, 2

Explanation:

A Number of significant figures for 23.023 is 5 .
Number of significant figures for 0.0003 is 1
Number of significant figures for $2.1 \times 10^{- 3}$ is 2 .
Therefore, the correct sequence is $5, 1, 2$ .

AIEEE 2010

Units and Measurements

139940 The number of significant figures in the numbers $4.8000 \times 10^{4}$ and 48000.50 are respectively

1 5 and 6

2 5 and 7

3 2 and 7

4 2 and 6

Explanation:

B All the non digits are significant. Power of 10 is irrelevant for the determination of significant figures. Hence, $4.8000 \times 10^{4}$ has five significant figures.
Also, all the zeros between two non-zero digits are significant. Hence, 48000.50 has 7 significant figures.
Explanation-No. of significant figures in $4.8000 \times 10^{4}$
$= (4, 8, 0, 0, 0)$ [ 5 significant figures]
No. of significant figures in 48000.50 $= (4, 8, 0, 0, 0, 5, 0)$ [7 significant figures]

Manipal UGET-2009

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