Tag: physics

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Questions Related to physics

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.

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.