Units and Measurements Test

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Units and Measurements Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Which of the quantity is dimensionless?

A
Force

B
Area

C
Work

D
Angle

Solution

Angle = length of Arc/ radius = L/L = 1 = [M⁰ L⁰ T⁰]
Question 2
1 / -0

Which of the following physical quantity is dimensionless?

A
Pressure

B
Area

C
Stress

D
Strain

Solution

Strain = Change in dimension/Original Dimension = [M⁰L⁰ T⁰]
Question 3
1 / -0

Relative error in Z, given that Z = 1/A² is:

A
two times the error in A

B
half the error in A

C
the square of the error in A

D
square root of error in A.

Solution

It is two times the error in A. If two quantities are multiplied or divided the relative error in the result is the sum of the relative errors in the multipliers.
Question 4
1 / -0

Numbers of significant figures in the volume of a cube of side 6.103 m are:

A
2

B
4

C
1

D
3

Solution

The number of significant figure in length of the side is 4. So the calculated volume should be rounded off to 4 significant figures. Multiplying numbers does not increase significant figures.
Question 5
1 / -0

The numbers of significant figures in 9.1 x10^-31 kg are:

A
Thirty one

B
Two

C
Three

D
Ten

Solution

As the power of 10 is irrelevant to the determination of significant figures hence, the numbers of significant figures are 2 (9 and 1).
Question 6
1 / -0

One angstrom is equal to __________ .

A
10^-9m

B
10^-12m

C
10^-11m

D
10^-10m

Solution

One angstrom (1^o) is equivalent to 10^-10m.
Question 7
1 / -0

A 2.16 g of a substance occupies 1.5 cm³. Its density to appropriate significant figure is:

A
1.44

B
1.5

C
1.4

D
1.444

Solution

There are 3 significant figures in measured mass whereas there are only 2 significant figures in measured volume. Hence density should be expressed to only 2 significant figures.
Question 8
1 / -0

Parallax method is used to measure:

A
very small distances

B
very large distances

C
very small angles

D
very large angles

Solution

Parallax method is used to measure very large distances between terristial objects.
Question 9
1 / -0

The error in two readings of A are 0.01 and -0.03, then mean absolute error is ?

A
- 0.004

B
0.002

C
0.02

D
- 0.02

Solution

The absolute value of the errors is taken.

So mean absolute error = (0.01 + 0.03) / 2 = 0.02

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Units and Measurements Test - 2

Result

Units and Measurements Test - 2

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SHARING IS CARING

Question 1

Force

Area

Work

Angle

Solution

Question 2

Pressure

Area

Stress

Strain

Solution

Question 3

two times the error in A

half the error in A

the square of the error in A

square root of error in A.

Solution

Question 4

2

4

1

3

Solution

Question 5

Thirty one

Two

Three

Ten

Solution

Question 6

10-9 m

10-12m

10-11m

10-10m

Solution

Question 7

1.44

1.5

1.4

1.444

Solution

Question 8

very small distances

very large distances

very small angles

very large angles

Solution

Question 9

- 0.004

0.002

0.02

- 0.02

Solution

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10^-9m

10^-12m

10^-11m

10^-10m