Tag: fundamental quantities

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Questions Related to fundamental quantities

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

$\displaystyle N{ kg }^{ -1 }$ is the unit of 

  1. Retardation

  2. Acceleration

  3. Rate of change of velocity

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Acceleration is measured as   $a = \dfrac{Force}{mass}$

Thus, $N kg^{-1}$ is the unit of acceleration.

Retardation is the acceleration in the opposite direction.

Also, acceleration is defined as rate of change of velocity of the body.
Thus option D is correct.
Multiple choice physics measurements and units summary of si units fundamental quantities system of units

The unit of absolute permitivity of a medium is 

  1. Joule/Coulomb

  2. Newton-Meter

  3. Farad/Meter

  4. Farad-Coulomb
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Absolute permittivity $(\epsilon)$ is the measure of the resistance that  is encountered when forming an electric field in a medium. The standard SI unit for absolute permittivity is Farad per meter $(F/m)$.

Multiple choice physics measurements and units summary of si units fundamental quantities system of units

The temp of the sun is measured with

  1. platinum thermometer

  2. gas thermometer

  3. pyrometer

  4. vapour pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
A pyrometer is a non-contacting device that intercepts and measures thermal radiation, a process known as pyrometry. This device can be used to determine the temperature of an object's surface.  As the temperature of the sun is very high, a non-contact type temperature measurement is needed. So pyrometer will be used to measure the temperature of the sun.