Tag: units - definitions and systems

Questions Related to units - definitions and systems

The measure of motion of a body is 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Speed

  2. Velocity

  3. Momentum

  4. Inertia

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Correct Option: C
Explanation:

The main quantity that measures the motion of a body is momentum. An object's momentum increases with the object's mass and with its velocity.

Unit of magnetic moment is

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Ampere-metre$^ { 2 }$

  2. Ampere-metre

  3. Weber-mettre$^ { 2 }$

  4. Weber/metre

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Correct Option: A
Explanation:

When current $ I $ flow in the circular loop of area $a$ than , magnetic moment will be $M=Ia= Am^2$

Ampere-hour is the unit of :

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. power

  2. energy

  3. quantity of electricity

  4. strength of current

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Correct Option: C
Explanation:

Ampere-hour is the unit of quantity of electricity or quantity of electric charge.

Power is measured in Watt.
Energy is measured in Joules.
Strength of current ia measured in Amperes.

In S.I . system value of G is ......${ Nm }^{ 2 }/{ kg }^{ 2 }$ 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $7.673\times 10^{ -11 }$

  2. $6.763\times 10^{ -11 }$

  3. $6.673\times 10^{ -11 }$

  4. $7.367\times 10^{ -11 }$

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Correct Option: C

$SI$  unit of strain is

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $N / m ^ { 2 }$

  2. $m$

  3. $N - m$

  4. no unit

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Correct Option: D

What is the  $SI$  unit of permeability?

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Henry per metre

  2. Tesla metre per ampere

  3. Weber per ampere metre

  4. All the above units are correct

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Correct Option: D

The unit of ${Iq}{Z}$ is:

 $I=$Current, $Z= $Electrical Impedance and $q =$ Charge 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Newton

  2. Dyne

  3. Joule

  4. None

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Correct Option: C
Explanation:

The given relation is ${ Iq }{ Z } $, since $q=It$.


Expression is $ { { I }^{ 2 } }{ Z } t$.

This is $Electrical\quad Power\quad X\quad time$. Hence the unit is $Joule$.

If E and H represent electric field and magnetic field intensity respectively, then E/H has unit of 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Ampere

  2. Ohm

  3. Volt

  4. Joule

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Correct Option: B

Express 100 K in $^0C$

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $ - {273^0}C$

  2. $ {100^0}C$

  3. $ {212^0}C$

  4. $ - {173^0}C$

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Correct Option: C

Which of the following is not a unit of heat energy?

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Joule

  2. Kelvin

  3. Calorie

  4. None of these

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Correct Option: B