Tag: measurements and units

Questions Related to measurements and units

The density of silver is _______ times greater than that of water.

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

  1. 14

  2. 10.4

  3. 12

  4. None of these

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Correct Option: B
Explanation:
Density of silver is   $10.49 \ g/cm^3$ and that of water is $1 \ g/cm^3$.
Density is silver is $10.49$ times than that of water. Thus the given statement is false.

Unit of relative density is kg m$^{-3}$

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

  1. True

  2. False

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Correct Option: B
Explanation:

Relative density is a unitless quantity. Thus the given statement is false.

The SI unit of pressure is ______.

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

  1. $N/{m^2}$

  2. Pa

  3. Both A and B

  4. None of the above

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Correct Option: C
Explanation:
As pressure $=\dfrac {Force (N)}{Area (m^2)}=N/m^2$
Its $SI$ unit is $N/m^2$ or Pa (passed)
option $-c$ is correct

Force F  and density d are related as F is equal to A divided by B plus root d obtain dimensions of A

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

  1. $M^ \dfrac{3}{2} L ^ {\dfrac{-1}{2} }T^{-2}$

  2. $M^ \dfrac{3}{2} L ^ {\dfrac{-1}{2} }T ^ {2}$

  3. $M^ \dfrac{3}{2} L ^ {\dfrac{1}{2} }T ^ {2}$

  4. $M^ \dfrac{3}{2} L ^ {\dfrac{5}{2} }T ^ {-2}$

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Correct Option: A

Illuminance of a surface is measured in

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

  1. lumen

  2. candela

  3. lux

  4. lux $m^{-2}$

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Correct Option: C
Explanation:

Illuminance is luminous flux per unit area, it is measure in 'lux'.

Dyne-sec is the unit of

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

  1. momentum

  2. force

  3. work

  4. angular momentum

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Correct Option: A
Explanation:

Change in momentum $=Force \times time=dyne-sec$

The fundamental unit is

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

  1. newton.

  2. pascal.

  3. hertz.

  4. second.

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Correct Option: D
Explanation:

'Second' is a fundamental unit.

The unit of atmospheric pressure is :

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

  1. $metre$

  2. $kg-wt$

  3. $gm { cm }^{ -2 }$

  4. $bar$

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Correct Option: D
Explanation:

Atmospheric pressure is measured in bar.

The unit of Luminous intensity is:

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

  1. Candela

  2. Watt

  3. Lumen

  4. Ampere

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Correct Option: A
Explanation:

Candela is the unit of Luminous intensity.
Watt is the unit of power.
Lumen is the unit of luminous flux.
Ampere is the unit of current.

Siemen is the S.I unit of:

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

  1. Electrical conductance

  2. Electrical conductivity

  3. Potential difference

  4. Inductance

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Correct Option: A
Explanation:

Siemen is the unit of Electrical conductance.
Siemens/meter is the unit of Electrical conductivity.
Voltage is the unit of Potential difference.
Henry is the unit of Inductance.