Physics · Science General

Units and Measurement

1,044 Questions

Master the fundamentals of physics with these practice questions on units and measurement. The topics include fundamental SI units, derived quantities, and specific units for power, force, and light. These questions are essential for building a strong foundation for competitive exams.

SI fundamental unitsUnits of powerDerived quantities unitsThermal energy unitsVolume measurement unitsElectric current units

Units and Measurement Questions

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

Full name of the unit named in the honour of a scientist is written with

  1. Lower initial letter

  2. Initial capital letter

  3. Lower letter

  4. All
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Full name of the unit named in the honour of a scientist is written with lower initial letter. For example, the full form for unit of force is newton and not Newton.

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

The ratio of SI unit to CGS unit of $g$ is :

  1. $10^2$
  2. $10$
  3. $10^{-1}$
  4. $10^{-2}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

SI unit of $g$ is   $m/s^2$
CGS unit of $g$ is  $cm/s^2$
We know that  $1 \ m = 100 cm$
Thus ratio of SI unit to CGS unit  $\dfrac{m/s^2}{cm/s^2} = \dfrac{100 \ cm/s^2}{cm/s^2} = 10^2$

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system
Which definition is correct and uses only quantities rather than units?

  1. Density is mass per cubic metre

  2. Potential difference is energy per unit current

  3. Pressure is force per unit area

  4. Speed is distance traveled per second
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

We know that 

Pressure $P= \dfrac{Force }{Area}$
So, option C is correct.

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

Which of the statements are false?

  1. The units of physical quantity represented by volume is $cm^3$
  2. The unit of physical quantity represented by mass is $ton$
  3. The work done is represented by $\dfrac{kg}{m}$
  4. The unit of physical quantity represented by weight is $Newton$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Work done is given by   $W = FS $
Thus work has the units of  $kg .m s^{-2}.m$
Thus statement given in option C is incorrect.

Multiple choice physics motion and measurement guidelines for writing the units conventions for the use of si units rules to write name and symbol for units of s.i. system

Which of the following statements below should be followed while using the symbol for a unit of a physical quantity?

  1. The symbol named after a scientist should begin with a capital letter.

  2. They can take plural forms.

  3. They can be written in full.

  4. They should be written only in the agreed symbols while using symbols.
Reveal answer Fill a bubble to check yourself
A,C,D Correct answer
Explanation
Basic rules for the use and writing for a  unit of a physical quantity are;
1. They symbol named after scientist should have the capital letter, 
2. They can be written in full 
3. They should be written only in the agreed symbols be used while using the symbol for a unit of a physical quantity. 
4. They cannot take plural forms.
Multiple choice

Which is a unit used to measure mass?

  1. Liter

  2. Feet

  3. Meter

  4. Gram
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The gram is a standard metric unit used to measure mass. Liters measure volume, while meters and feet measure length.

Multiple choice

What is the unit of pressure?

  1. Joules

  2. Kilograms

  3. Newtons

  4. Pascals
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Pascal (Pa) is the SI unit of pressure, defined as one Newton per square meter. Joules measure energy, Kilograms measure mass, and Newtons measure force.

Multiple choice

What are the units for resistance?

  1. Ohms

  2. Lumens

  3. Volts

  4. Joules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Ohm is the standard SI unit of electrical resistance. Volts measure potential difference, and Joules measure energy.

Multiple choice

Earth's revolution (orbit) takes approximately ...

  1. one day

  2. one month

  3. one year

  4. juan direction

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earth's revolution is the path it takes around the sun, which takes approximately 365.25 days, or one year. Option D is a humorous distractor.

Multiple choice dew point and humidity heat physics

The units of Relative Humidity are

  1. $kg-m^{3}$

  2. kg
  3. $kg-m^{2}$

  4. none of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Relative humidity refers to the ratio of the amount of moisture in the air at a certain temperature to the maximum amount of moisture that the air can retain at the same temperature. Relative humidity is expressed as a percentage and is highest during rain.