Tag: standardized measurement

Questions Related to standardized measurement

Potential is measured in

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. joule/coulomb

  2. watt/coulomb

  3. newton-second

  4. none of these

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Correct Option: A
Explanation:

Potential is work done per unit charge $\displaystyle =\frac {J}{c}$

Name the physical quantity related to the following unit : watt.

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. $Force$

  2. $Power$

  3. $Work$

  4. $Pressure$

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Correct Option: B
Explanation:

Watt is  the SI unit of power, equivalent to one joule per second.

Power $=$ force $\times$ velocity $=$ Work/time
So, $watt=Nms^{-1}=J/s$

Name the physical quantity related to the following unit : pascal.

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. $Force$

  2. $Pressure$

  3. $Work$

  4. $Distance$

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Correct Option: B
Explanation:

The pascal (symbol: Pa) is the SI derived unit of pressure, internal pressure, stress, Young's modulus.

Pressure $=\dfrac{Force}{Area}$ 
So, $1\ pascal=1\ N/m^2$

Column I gives three physical quantities. Select the appropriate units for these from the choices given in column II. Some of the physical quantities may have more than one choice.

Column-I Column - II
a) Capacitance d) Ohm second
b) Inductance e) Coulomb$^{2}$ joule$^{ -1 }$
c) Magnetic induction f) Coulomb volt$^{ -1 }$
g) Newton (ampere/metre)$^{ -1 }$
h) Volt second (ampere)$^{ -1 }$
physics measurements and units kinds of units fundamental quantities standardized measurement

  1. a-e,f; b-d,h; c-g

  2. a-h; b-d; c-e

  3. a-e; b-g,h; c-g

  4. a-e,f; b-d,h; c-d,e

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Correct Option: A
Explanation:

Capacitance is charge per unit volt. 

Volt has unit of work per unit chage. 
So capacitance has units of charge square per unit energy. 
Inductance is defined as volt per unit rate of change of current and voltage per unit current is resistance, so inductance is ohm second. 

The SI unit of magnetic permeability is

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. ${ Am }^{ -1 }$

  2. ${ Am }^{ -2 }$

  3. ${ Hm }^{ -2 }$

  4. ${ Hm }^{ -1 }$

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Correct Option: D
Explanation:

The correct option is D.

The magnetic permeability of any material is its property for allowing the magnetic line of force to pass through it. Therefore, the magnetic material can support the development of the magnetic field. This capability is measured by the magnetic permeability. Also, the magnetic line of force is directly proportional to the conductivity of the material. Its SI unit is Henry per meter i.e. $Hm^{-1}$ or newton per ampere square.

$\left( Coulomb \right) ^{ 2 }{ J }^{ -1 }$ can be the unit of :

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. electric resistence

  2. electric energy

  3. electric capacity

  4. electric power

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Correct Option: C
Explanation:

Electric energy $=ML^{2}T^{-2}$
Electric power $=ML^{2}T^{-3}$
Electric resistance $= ML^{2}I^{-2}T^{-3}$
Electric capacity $=M^{-1}L^{-2}I^{2}T^{4}$$=\left ( \dfrac{I^{2}T^{2}}{(M^{1}L^{2}T^{-2})} \right )=\left ( \dfrac{Q^{2}}{J} \right )$
Hence, option C is correct.

joule is the unit of

physics measurements and units kinds of units fundamental quantities standardized measurement

  1. heat

  2. temperature

  3. thermometry

  4. work

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Correct Option: A,D
Explanation:

Joule is unit of heat , energy and work.

How many fundamental units are present in the SI system of units?

physics measurement of physical quantities kinds of units fundamental quantities standardized measurement

  1. 5

  2. 6

  3. 7

  4. 3

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Correct Option: C
Explanation:

There are seven fundamental units in the SI system of units which are mass, length, time, temperature, electric current, mole and luminous intensity.

State whether true or false.
The quantity of matter in a body is called its mass.

physics measurement of physical quantities kinds of units fundamental quantities standardized measurement

  1. True

  2. False

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Correct Option: A
Explanation:

Mass of a body is defined as the quantity of matter contained in a body.

The units which can neither derived from one another nor resolved into any thing more basic are called 

physics measurement of physical quantities kinds of units fundamental quantities standardized measurement

  1. Fundamental unit

  2. Scale

  3. Derived unit

  4. Standard unit

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Correct Option: A
Explanation:

The units which can neither derived from one another nor resolved into any thing more basic are called fundamental unit. It is independent of any other unit.