Tag: summary of si units

Questions Related to summary of si units

Which of the following unit is not a fundamental unit:

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

  1. Meter

  2. Litre

  3. Second

  4. Kilogram

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Correct Option: B
Explanation:

Litre is not a fundamental unit.

The SI unit of $ \dfrac{1}{2 \pi \sqrt{LC}}$ is equivalent to that of :

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

  1. time period

  2. frequency

  3. wavelength

  4. wave number

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Correct Option: B
Explanation:

The angular frequency of current oscillations in an LC circuit is given by $\omega =\dfrac{1}{\sqrt {LC}}$ and $\omega = 2\pi f$.
$\Rightarrow f= \dfrac{1}{2\pi \sqrt{LC}}$ and the unit is equivalent to that of frequency.

The SI unit of coefficient of mutual inductance of a coil is

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

  1. henry

  2. volt

  3. farad

  4. weber

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Correct Option: A
Explanation:

The henry (symbolized H) is the Standard International ( SI ) unit of coefficient of mutual inductance of a coil .

The S.I. unit of pole strength is

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

  1. $Am^2$

  2. $Am$

  3. $Am^{-1}$

  4. $Am^{-2}$

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Correct Option: B
Explanation:

Pole strength, $m=\displaystyle \frac {Magnetic \ moment}{2l}=\frac {Am^2}{m}=Am$

Rate of energy dissipation is measured in 

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

  1. Watt

  2. Joule

  3. Weber

  4. Joule / coulomb

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Correct Option: B

The units of fundamental physical quantities are known as ________ units.

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

  1. Derived

  2. Absolute

  3. Supreme

  4. Fundamental

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Correct Option: D
Explanation:

The units of fundamental physical quantities are known as fundamental units.

Which of the following does not has fundamental unit?

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

  1. Mass

  2. Time

  3. Force

  4. Electric current

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Correct Option: C
Explanation:

The fundamental units are defined arbitrarily and they are used to derive of others unit. Generally the most common fundamental units are mass, time, length and current.

As the unit of force can be derived from three fundamental units, mass, length and time so the force does not has fundamental unit.

Light year is a measurement of 

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

  1. Speed of aeroplanes

  2. Speed of light

  3. Stellar distances

  4. Speed of rockets

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Correct Option: C
Explanation:

Light year is the unit of astronomical distance. It is a distance that light travels in one year. 

So, $1$ light year $=(3\times 10^8)\times (365\times 24\times 3600)=9.46\times 10^{15} m$

Write S.I. unit of charge

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

  1. C

  2. A

  3. N m$^2$

  4. None of the above

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Correct Option: A
Explanation:

SI unit of charge is Coulomb which is represented by the symbol $C$.

The quantity represented by the product of "Resistance and inductance" is

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

  1. mass

  2. length

  3. time

  4. none

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Correct Option: D
Explanation:

The product of resistance and inductance is not represented by any quantity given above.