Units and Measurements Test

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Units and Measurements Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

One femtometer is equivalent to

A
10¹⁵ m

B
10^–15 m

C
10^–12 m

D
10¹² m
Question 2
4 / -1

Length cannot be measured by

A
Fermi

B
Debye

C
Micron

D
Light year
Question 3
4 / -1

1 a.m.u is equivalent to

A
1.6 × 10^–27 kg

B
934 MeV

C
1.6 × 10^–24 gm

D
All of these
Question 4
4 / -1

The surface tension of a liquid is 70 dyne/cm. In MKS system its value is

A
70 N/m

B
7 × 10^–2 N/m

C
7 × 10³ N/m

D
7 × 10² N/m

Solution
Question 5
4 / -1

The SI unit of universal gas constant (R) is

A
Watt K^–1 mol^–1

B
Newton K^–1 mol^–1

C
Joule K^–1 mol^–1

D
Erg K^–1 mol^–1

Solution
Question 6
4 / -1

What are the units of K = 1/ 4 πε₀ ?

A
C² N^–1 m^–2

B
Nm²C^–2

C
Nm²C²

D
Unitless

Solution
Question 7
4 / -1

The mean time period of second’s pendulum is 2.00s and mean absolute error in the time period is 0.05s. To express maximum estimate of error, the time period should be written as

A
(2.00 ± 0.01)s

B
(2.00 + 0.025)s

C
(2.00 ± 0.05)s

D
(2.00 ± 0.10)s
Question 8
4 / -1

The percentage error in the above problem is

A
7%

B
5.95%

C
8.94%

D
9.85%

Solution
Question 9
4 / -1

The unit of percentage error is

A
Same as that of physical quantity

B
Different from that of physical quantity

C
Percentage error is unit less

D
Errors have got their own units which are different from that of physical quantity measured
Question 10
4 / -1

If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be

A
8%

B
2%

C
4%

D
6%

Solution

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Units and Measurements Test - 30

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Units and Measurements Test - 30

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Question 1

1015 m

10–15 m

10–12 m

1012 m

Question 2

Fermi

Debye

Micron

Light year

Question 3

1.6 × 10–27 kg

934 MeV

1.6 × 10–24 gm

All of these

Question 4

70 N/m

7 × 10–2 N/m

7 × 103 N/m

7 × 102 N/m

Solution

Question 5

Watt K–1 mol–1

Newton K–1 mol–1

Joule K–1 mol–1

Erg K–1 mol–1

Solution

Question 6

C2 N–1 m–2

Nm2C–2

Nm2C2

Unitless

Solution

Question 7

(2.00 ± 0.01)s

(2.00 + 0.025)s

(2.00 ± 0.05)s

(2.00 ± 0.10)s

Question 8

7%

5.95%

8.94%

9.85%

Solution

Question 9

Same as that of physical quantity

Different from that of physical quantity

Percentage error is unit less

Errors have got their own units which are different from that of physical quantity measured

Question 10

8%

2%

4%

6%

Solution

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10¹⁵ m

10^–15 m

10^–12 m

10¹² m

1.6 × 10^–27 kg

1.6 × 10^–24 gm

7 × 10^–2 N/m

7 × 10³ N/m

7 × 10² N/m

Watt K^–1 mol^–1

Newton K^–1 mol^–1

Joule K^–1 mol^–1

Erg K^–1 mol^–1

C² N^–1 m^–2

Nm²C^–2

Nm²C²