Tag: measurement of distance

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

The unit of the quantity $g/G$ in SI will be

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

  2. $mk$ ${g}^{-2}$

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

  4. ${kg}^{2}$ ${m}^{-1}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The quantity g is acceleration due to gravity (m/s^2) and G is the universal gravitational constant (N m^2/kg^2). The ratio g/G has units (m/s^2) / (N m^2/kg^2) = (m/s^2) * (kg^2 / (kg m/s^2 * m^2)) = kg/m^2.

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

The average kinetic energy $E$ of a gas molecule is given by the equation$E=\cfrac{3}{2}kT$
where $T$ is the absolute (kelvin temperature)
What are the SI base units if $k$?

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

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

  3. $kg$ ${ms}^{-2}{K}^{-1}$

  4. $kg{m}^{2}{s}^{-2}{K}^{-1}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Here ,

$E = \dfrac{3}{2}kT$
$\implies k= \dfrac{2E}{3T}$
$\implies [k] = \dfrac{[E]}{[T]}$
$\implies [k] = \dfrac{kgm^{2}s^{-2}}{K}$
$\implies [k] = kgm^2s^{-2}K^{-1}$

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

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

  1. Travels fast

  2. Speed independent of location and temperature

  3. No medium to travel

  4. No advantage
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Advantage :

1) It is easy available and invariable

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

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

Choose the correct answer from the following

  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
Reveal answer Fill a bubble to check yourself
C,D Correct answer
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.