Tag: physics

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

The gravitational unit of force in the metric system is

  1. g wt

  2. N

  3. kg wt

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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 $kg\,wt$.

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

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

  1. Solar luminosity

  2. Luminous intensity

  3. Luminous flux

  4. Solar intensity
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solar luminosity is defined as the total amount of energy emitted by a star per unit time. Luminous flux and intensity relate to human perception of light, not total energy emission.

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

The unit of power is

  1. Joule per second only

  2. Joule only

  3. Joule per second and watt both

  4. Watt only

  5. Erg
Reveal answer Fill a bubble to check yourself
C Correct answer
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:


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

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

The correct relation is -

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

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

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

  4. Density = Volume $ \displaystyle \div $ Mass
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

We know that Density = Mass / Volume

So, Mass = Density X Volume (Option B)

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

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

  1. Torque and work

  2. Angular momentum and work

  3. Energy and Young's modulus

  4. Light year and wavelength
Reveal answer Fill a bubble to check yourself
A,D Correct answer
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$=L$

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

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

  1. incremental unit time learning model

  2. incremental price learning model

  3. incremental unit average model

  4. incremental cost learning model
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The incremental unit time learning model assumes that the time required to produce each additional unit decreases as experience is gained, leading to a specific cumulative time prediction.