Tag: physical quantities and measurement

Questions Related to physical quantities and measurement

What is the value of $1 \ mg$ in $kg$?

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

  1. $10^{6}$

  2. $10^{-6}$

  3. $10^{-3}$

  4. $10^{3}$

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Correct Option: B
Explanation:
$1\  mg =10^{-3}g$ and $1\ g=10^{-3}kg$
So , $1\ mg =10^{-6} kg$

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

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

  1. Length

  2. Density

  3. Volume

  4. Mass

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Correct Option: A
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 $700\ nm$.

What is the value of $1  \ gm$ in $kg$?

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

  1. $10^{-6}$

  2. $10^{6}$

  3. $10^{-3}$

  4. $10^{3}$

Show answer
Correct Option: C
Explanation:
$1\ kg = 1000\  g$
$\therefore 1\  gm = 10^{-3}$

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

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

  1. Weight

  2. Mass

  3. Area

  4. None of the above

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Correct Option: B
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.

Name the physical quantities which are measured in '$u$'.

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

  1. Mass

  2. Energy

  3. Volume

  4. Length

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Correct Option: A
Explanation:

The unified atomic mass unit (symbol: $u$) is the standard unit that is used for indicating mass on an atomic or molecular scale (atomic mass).

$1u=1.66\times10^{-27}\ kg$

State whether the following statement is True or False. 

Kg is the unit of mass in the M.K.S. system.

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

  1. True

  2. False

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Correct Option: A
Explanation:

In M.K.S. system of units, mass is measured in kilogram (Kg). Thus the given statement is true.

What is the S.I. base unit of mass ?

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

  1. pound

  2. kg

  3. g

  4. none of these

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Correct Option: B
Explanation:

S.I. base unit of mass is kilogram represented by kg.

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

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

  1. $22.5\ quintals$

  2. $130.5\ quintals$

  3. $11.2\ tonnes$

  4. $12\times 10^3kg$

Show answer
Correct Option: B
Explanation:
Given ,
The mass of first object  $m _{1}=1050kg=10.50quintals , $
The mass of second object $ m _{2}=12tonnes=120quintals$

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

SI unit of mass is

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

  1. kg

  2. g

  3. Newton

  4. All of these

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Correct Option: A
Explanation:

The SI unit of mass is kg, CGS unit of mass is g (gram). Newton is the SI unit of force. 

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. 

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

  1. centimetre

  2. metre

  3. decimetre

  4. none of the above

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Correct Option: B
Explanation:

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