Tag: physics

Questions Related to physics

What is C.G.S unit of density?

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

  1. $g cm^{-3}$

  2. $g m^{-3}$

  3. $g cm^{-2}$

  4. $kg m^{-3}$

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Correct Option: A
Explanation:

CGS. units of density. is $g cm^{-3}$ where as in MKS unit it is $kg/m^3$.

Newton is the unit of which quantity.

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

  1. Acceleration

  2. Force

  3. Mass

  4. Gravity

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Correct Option: B
Explanation:

We get Kilogram metre per second as the MKS units of force.

In the honor of famous scientist Sir Isaac Newton this unit is also called Newton. Hence newton is the SI unit of force.

One horse power is equal to

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

  1. $1000  W$

  2. $500  W$

  3. $764  W$

  4. $746  W$

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Correct Option: D
Explanation:

$1$ $hp = 745.699872 W$. 

Approximately it will be $746  W$.

Which of the following is derived units of work?

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

  1. kg m$^2$ s$^{-2}$

  2. kg m$^2$ s$^{2}$

  3. kg m$^2$ s$^{-3}$

  4. kg m$^2$ s$^{-1}$

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Correct Option: A
Explanation:

Work done by a force   $W = FS$
Units of work   $W = kg.ms^{-2}\times m = kg \ m^2 \ s^{-2}$

Write the derived S.I units of force.

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

  1. $Newton$

  2. $Pascal$

  3. $Mass$

  4. $Dyne$

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Correct Option: A
Explanation:

The newton (symbol: N) is the International System of Units (SI) derived unit of force which is equivalent to $kg  m  { s }^{ -2 }$

How is the following derived unit related to the fundamental units?

1) joule

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

  1. $N m$$ s^{-1}$

  2. $Nm$

  3. $kg m$$^2 s^{-1}$

  4. $kg m$$^2 s^{-2}$

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Correct Option: D
Explanation:

1 joule (or 1J) is expressed in other SI units as $kg  { m  }^{ 2 } { s }^{ -2 }$

Newton is written in fundamental units as $kg\ m/s^{x}$. Value of $x$ is:

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

  1. 2

  2. 3

  3. 1

  4. -2

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Correct Option: A
Explanation:

$1$ newton (or $1\ N$) is expressed in other SI units as $kg  m  { s }^{ -2 }$.

If pascal is written in fundamental units as kg m$^{-x} s^{-2}$,then $x$ is:

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

  1. $1$

  2. $2$

  3. $-1$

  4. $3$

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Correct Option: A
Explanation:

1 pascal (or 1Pa) is expressed in other SI units as $kg  { m }^{ -1 }  { s }^{ -2 }$

Name the physical quantities related to joule.

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

  1. mass

  2. energy

  3. pressure

  4. intensity

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Correct Option: B
Explanation:
Energy is measured in joule.

Write the derived unit of pressure.

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

  1. kg m$^{-1} s^{-2}$

  2. kg m$^{-2} s^{-2}$

  3. kg m$^{-1} s^{-1}$

  4. kg$^2$ m$^{-1} s^{-2}$

Show answer
Correct Option: A
Explanation:
$Pressure=\dfrac{Force}{Area}=\dfrac{Mass \times Acceleration}{Area}$
$Pressure=kg\times ms^{-2}/m^2=kgm^{-1}s^{-2}$