Physics · Science General

Units and Measurement

998 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 electric current, potential difference and resistance electric potential and potential difference potential difference current in electric circuits

Name the physical quantity of which the unit is ampere: 

  1. Current.

  2. Capacitance

  3. Charge

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

An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma.
The SI unit for measuring an electric current is the ampere, which is the flow of electric charge across a surface at the rate of one coulomb per second. Electric current is measured using a device called an ammeter.

Multiple choice physics force concept of force and its unit force - push or pull forces

The strength of a force is usually expressed by its:

  1. unit

  2. magnitude

  3. direction

  4. both unit and magnitude.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A force could be larger or smaller than the other and the strength of the force is expressed by its magnitude only. For example, $1\ N$ of force is larger than $1\ mN$ of force.

Multiple choice zoology living and non living characteristics of life attributes of living organisms signs of life biology : an introduction living world and classification

The structural unit of a nonliving being is

  1. Electron

  2. Neutron

  3. Cell

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

Non-living beings are made up of a single or combination of molecules repeated in a sequence or randomly arranged. A molecule is a group of two or more atoms bound by chemical bonds. A few examples of non- living being is water, table, ground.

So, the correct answer is 'Molecule'.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

The unit of power is:

  1. $Kilowatt$
  2. $kWhv$
  3. $dyne$
  4. $joule$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Power is defined as the work done per unit time. So to get the SI unit of power :

$Power=\dfrac{Work}{Time}$

SI unit of Work $=$ Joules

SI unit of Time $=$ second

So S.I. unit of power $=\dfrac{Joule}{Second}=Watt$

$1000\,Watt=1\,Kilowatt$

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Three of these quantities have the same unit. Which quantity has a different unit ?

  1. $\dfrac{distance}{energy}$
  2. $force$
  3. $power\times time$

  4. rate of change of momentum
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Force, power times time (energy), and rate of change of momentum (force) all have units of Newtons or Joules. Distance/energy has units of m/J, which is different from the others.