Tag: physics

Questions Related to physics

The gravitational unit of force in the metric system is

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. g wt

  2. N

  3. kg wt

  4. None of these

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Correct Option: C
Explanation:

Gravitational force is the force exerted by earth on any body which attracts to body towards earth. It is same as any other force.  The gravitational unit of force in the metric system is $kg\,wt$.

The amount of energy emitted per unit time is called _______ .

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Solar luminosity

  2. Luminous intensity

  3. Luminous flux

  4. Solar intensity

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Correct Option: A

The unit of power is

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Joule per second only

  2. Joule only

  3. Joule per second and watt both

  4. Watt only

  5. Erg

Show answer
Correct Option: C
Explanation:

Power is defined as work divided by time, so its units are joules/second. Scientists have another name for this unit, too. It's the watt, named after James Watt, the Scottish inventor who helped develop the steam engine that powered the Industrial Revolution. In the SI system, the watt is defined as:


$1\,watt=1\,J/s=1\,kg\,m^2/s^3$

The correct relation is -

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Density = Mass $ \displaystyle \times $ Volume

  2. Mass = Density $ \displaystyle \times $ Volume

  3. Volume = Density $ \displaystyle \times $ Mass

  4. Density = Volume $ \displaystyle \div $ Mass

Show answer
Correct Option: B
Explanation:

We know that Density = Mass / Volume

So, Mass = Density X Volume (Option B)

Weight of a body is measured by a 

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Beam balance

  2. Physical balance

  3. Spring balance

  4. Density bottle

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Correct Option: C
Explanation:

Weight is measured with the help of Spring Balance. (Option C) 

The SI unit of weight is

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Kgf

  2. Gf

  3. N

  4. None of these

Show answer
Correct Option: C
Explanation:

The SI unit of weight is Newton  (N). Option C

Which one of the following is not a unit of British system of units?

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Foot

  2. Metre

  3. Pound

  4. Second

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Correct Option: B
Explanation:

Among the given units metre is not a unit of British system whereas all other units belong to this system.

The dimensions of the quantities in one (or more) of the following pairs are the same. Identify the pair(s).

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. Torque and work

  2. Angular momentum and work

  3. Energy and Young's modulus

  4. Light year and wavelength

Show answer
Correct Option: A,D
Explanation:

Torque$={ M }^{ 1 }{ L }^{ 2 }{ T }^{ -2 }$

Work$={ M }^{ 1 }{ L }^{ 2 }{ T }^{ -2 }$
angular momentum(L)=${ M }^{ 1 }{ L }^{ 2 }{ T }^{ -1 }$
Energy$={ M }^{ 1 }{ L }^{ 2 }{ T }^{ -2 }$
Young's Modulus $(Y)$$={ M }^{ 1 }{ L }^{ 2 }{ T }^{ -2 }$
Light year$=L$
Wavelength$=L$

1 Me V$=$

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. $1.6\times 10^{-12} Joules$

  2. $1.6\times 10^{-10} Joules$

  3. $1.6\times 10^{-13} Joules$

  4. $1.6\times 10^{-11} Joules$

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Correct Option: A

As compared to cumulative average-time learning model, learning model which predicts more cumulative total time to produce more units is known as ____________.

standardized measurement measurement of physical quantities need of unit for measurement measurements and experimentation physics

  1. incremental unit time learning model

  2. incremental price learning model

  3. incremental unit average model

  4. incremental cost learning model

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Correct Option: A