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 physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

Name the physical quantity(s) which is(are) measured in the $nm$.

  1. Length

  2. Density

  3. Volume

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

Nanometre or $nm$ is a unit of length in the metric system. $1\ nm=10^{-9}\ m$.

The nanometre is often used to express dimensions on an atomic scale: the diameter of a helium atom, for example, is about $0.1\ nm$, and that of a ribosome is about $20\ nm$. The nanometre is also commonly used to specify the wavelength of electromagnetic radiation near the visible part of the spectrum: visible light ranges from around $400$ to $700\ nm$.

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

The measure of amount of matter contained inside a body is called its ___________.

  1. Weight

  2. Mass

  3. Area

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mass is the amount of matter contained inside a body and it remains constant irrespective of the change in its location

Mass is a measure of amount of matter contained inside body.

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

It has long been an objective in metrology to define the kilogram in terms of a fundamental constant, in the same way that the ____________________ is now defined in terms of the speed of light. 

  1. centimetre

  2. metre

  3. decimetre

  4. none of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Metre is the SI unit used for measuring the distance which is defined taking speed of light as a reference.

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

Which of the following defines 1 kg of mass correctly?

  1. When a force of 1N produced an acceleration of $\displaystyle 1{ m }/{ { s }^{ 2 } }$ in a body, then the mass is said to be 1 kg
  2. When a force of 10N produced an acceleration of $\displaystyle 10{ m }/{ { s }^{ 2 } }$ in a body, then the mass of body is said to be 1 kg
  3. When a force of 100N produced an acceleration of $\displaystyle 1{ m }/{ { s }^{ 2 } }$ in a body, then the mass of body is said to be 1 kg

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

When a force of 1 N produced an acceleration of $\displaystyle 1{ m }/{ { s }^{ 2 } }$ in a body, then the mass of body is said to be 1 kg.(definition)

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

The kilogram, originally defined as the mass of ___________________at the temperature of maximum density, was known as the Kilogram of the Archives.

  1. one cubic decimeter of gasoline

  2. one cubic decimeter of water

  3. one cubic decameter of water

  4. one square decameter of water
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The kilogram, defined as the mass of one cubic decimeter of water at $4^o C$ is known as kilogram of the Archives.

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

The kilogram is the SI base unit of mass and is equal to the mass of the international prototype of the kilogram , a ___________standard that is kept at the International Bureau of Weights and Measures (BIPM) .

  1. platinum-iridium

  2. platinum

  3. iridium

  4. all of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Platinum-iridium is the standard that is kept at the International Bureau of Weights and Measures (BPIM).

Multiple choice physics physical quantities and measurement measurement of small and large distances measurement of distance unit of fundamental quantities

______________________ is/are linked through its/their definitions to the mass of the platinum-iridium cylinder stored in a vault near Paris.

  1. ampere

  2. mole

  3. candela

  4. all of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Ampere, Mole and Candela are linked through their definitions to the mass of the platinum-iridium cylinder stored in a vault near Paris.