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 measurements and units summary of si units fundamental quantities system of units

Debye is a unit of

  1. rms velocity

  2. force

  3. specific gravity

  4. electric dipole moment
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The correct option is D.

The Debye, represented as D, is a CGS unit of electric dipole moment. This name was given in the honor of the physicist Peter J. W. Debye. Its value is defined as $1 \times { 10 } ^{ -18 }$ statcoulomb-centimetre.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

$\displaystyle N{ kg }^{ -1 }$ is the unit of 

  1. Retardation

  2. Acceleration

  3. Rate of change of velocity

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Acceleration is measured as   $a = \dfrac{Force}{mass}$

Thus, $N kg^{-1}$ is the unit of acceleration.

Retardation is the acceleration in the opposite direction.

Also, acceleration is defined as rate of change of velocity of the body.
Thus option D is correct.
Multiple choice physics measurements and units summary of si units fundamental quantities system of units

The unit of absolute permitivity of a medium is 

  1. Joule/Coulomb

  2. Newton-Meter

  3. Farad/Meter

  4. Farad-Coulomb
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Absolute permittivity $(\epsilon)$ is the measure of the resistance that  is encountered when forming an electric field in a medium. The standard SI unit for absolute permittivity is Farad per meter $(F/m)$.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

The SI unit of electric energy or heat energy is ________.

  1. joule (J)

  2. Volt (V)

  3. ampere (A)

  4. watt (W)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

SI unit of electric energy or heat energy is Joule (J). One Joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one meter. One Joule is equivalent of one watt of power radiated or dissipated for one second.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

Joules / coulomb is the same as....

  1. Watt

  2. ampere

  3. Volt

  4. Ohm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Joule is a unit for work done and coulomb is the unit for the charge. The potential is defined as the ratio of the work done to the charge and the unit of the potential difference is volt. Hence, one joule per coulomb is equal to the unit of the potential difference. Therefore it will be equal to one Volt.