Tag: physics

Questions Related to physics

What is the advantage of choosing the wavelength of light as a standard of length?

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. Travels fast

  2. Speed independent of location and temperature

  3. No medium to travel

  4. No advantage

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Correct Option: B
Explanation:

Advantage :

1) It is easy available and invariable

2) It is well defined and does not change with locations, temperature, time, pressure etc

Which of the following is not the unit of length 

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. micron

  2. light year

  3. angstrom

  4. radian

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Correct Option: D
Explanation:

Radian is not the unit of length it is the unit of angle.

The SI unit of length is the:

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. Millimetre

  2. Centimetre

  3. Metre

  4. Kilometre

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Correct Option: C
Explanation:

Metre is the SI unit of length.

Choose the correct answer from the following

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. An area of one square centimetre is $10^4$ times greater than one square metre

  2. $1 hour\ 18 min$ is equal to $3618$ seconds.

  3. SI unit of volume is cubic metres.

  4. Metre is the standard unit to measure length

Show answer
Correct Option: C,D
Explanation:

$1$ square centimeter $=(10^{-2})^2 m^2=10^{-4} m^2$

Thus, option A will be wrong.
$1 hour\ 18 min$ $=3600+(18\times 60)=3600+1080=4680 $ seconds.
So, option B will also wrong.
We know that the SI unit of volume is cubic meter and meter is the standard unit of length.
Thus, option C and D both are correct.

A length is measured as $7.60$m. This is the same as

physics learning how to measure measurement of small and large distances measurement of distance unit of fundamental quantities

  1. $760$mm

  2. $0.0076$mm

  3. $760$cm

  4. $0.76dm$

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Correct Option: C
Explanation:

Length $l=7.6m$

we know 
${ 1 \ m }=100 \ cm=1000 \ mm=10\ dm$
$\therefore l= 7.6m=760cm=7600mm=76dm$

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. $10^{3}$

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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).

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