Tag: physical quantities and measurement

Quizzes (17) Questions (16)

Questions Related to physical quantities and measurement

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

The total mass of two objects of mass $1050 \ kg$ and $12 \ tonnes$ is

  1. $22.5\ quintals$

  2. $130.5\ quintals$

  3. $11.2\ tonnes$

  4. $12\times 10^3kg$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Given ,
The mass of first object  $m _{1}=1050kg=10.50quintals , $
The mass of second object $ m _{2}=12tonnes=120quintals$

Therefore , total mass ,
             $M=m _{1}+m _{2}=10.50+120=130.50quintals$
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.