Unit conversion is a multi-step process involving multiplication or division by a numerical factor, selecting the correct number of significant digits, and rounding. Unit conversion and measurement are a part of our day-to-day lives. Unit conversion is one of the topics that you need to master in order to do well in physics. Here, we have provided a few practice questions to help you better understand the concept.
Important Questions on Unit Conversion
1) What is unit conversion?
Conversion of Using multiplication or division by conversion factors for converting one unit to another unit of measurement for the same quantity is known as unit conversion.
Scientific notations are used to express the units and as per the quantities converted into numerical values.
2) What is the CGS system of unit’s conversion?
The CGS (centimetre-gram-second) system of units is a variation of the metric system that is based on the following:
The unit of length is centimetre (cm)
The unit of mass is gram (gm)
The unit of time is second (s)
3) What is the conversion of units in the SI System?
“The System International Units” is known as the SI system that is based on the following:
|
Quantity |
Unit |
Abbreviation |
|
Mass |
kilogram |
Kg |
|
Length |
metre |
m |
|
Time |
second |
s |
|
Temperature |
Kelvin |
K |
|
Amount |
mole |
mol |
|
Current |
Ampere |
A |
|
Intensity |
Candela |
Cd |
4) Which among the following is an incorrect conversion?
a) 1 mile = 5280 ft.
b) 1 inch = 2.54 cm
c) 1 ft. = 12 inch
d) None of these
Correct Option: (d)
Explanation: All the above-mentioned options are exact conversions of length.
5) Fundamental unit for the length in the metric system is _________.
a) km
b) cm
c) in
d) m
Correct Option: (d)
Explanation: metre (m) is the fundamental unit for the length in a metric system.
6) Fundamental dimensions are those quantities that cannot be measured independently.
a) True
b) False
Correct Option: (b)
Explanation: Fundamental dimensions can be measured independently.
7) A person is 5’4″ tall; how will you convert his height into metres?
To convert feet to metres-
First, converting feet to metres,
5 ft × 0.305 = 1.53 metres
Now, converting the inches to centimetres, we get
4 inches × 2.54 = 10.16 cm = 0.1016 metres
Adding these two together, we get
1.53 metres + 0.1016 metres = 1.6316 metres.
8) The general expression of characteristics of measurement is _____.
a) Dimensions
b) Units
c) Fractions
d) None of these
Correct Option: (a)
Explanation: The characteristics of measurement are expressed generally in dimensions.
9) Joules/Kg/Kelvin is a _________.
a) CGS unit
b) SI unit
c) Neither CGS nor SI unit
d) None of these
Correct Option: (b)
Explanation: Joules/Kg/Kelvin is a SI unit of heat capacity.
10) Which among the following is not a dimension?
a) Time
b) Kelvin
c) Length
d) Mass
Correct Option: (b)
Explanation: Kelvin is a unit, not a dimension.
Practice Questions
1) How many joules is equal to 1 BTU?
2) How can you convert 1 pound-force to newton?
3) What is the SI system of unit conversion?
4) What is the unit of luminous intensity?
5) How many seconds are there in 1 hour?
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