Tag: measurements and experimentation

Questions Related to measurements and experimentation

Which of the following does not has fundamental unit?

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

  1. Mass

  2. Time

  3. Force

  4. length

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Correct Option: C
Explanation:

The fundamental units are the units of the fundamental quantities, as defined by the International System of Units. They are not dependent upon any other units, and all other units are derived from them. There are seven basic fundamental quantities: Length, mass, time, electric current, amount of substance, luminous intensity & temperature. The quantities which are derived with the help of these basic physical quantities are called derived quantities. They are density, volume, pressure, force, etc.

The wavelength of light is usually expressed in

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

  1. Micron

  2. Fermi

  3. Nanometer

  4. Angstrom

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Correct Option: D
Explanation:

Angstrom $(\dot A)$ unit of length used chiefly in measuring wavelengths of light, equal to $10^{-10}$ metre, or $0.1$ nanometer.  It is used to express wavelengths of visible light, ultraviolet (UV) light, X rays, and gamma rays.

Which of the following is the largest unit of length?

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

  1. Light year

  2. Astronomical unit

  3. Parsec

  4. Nothing can be decided

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Correct Option: C
Explanation:

Parsec is the largest unit of length. It is usaed to measure the space distances.


$1\,Parsec=3.26$ light year

In a tug-of-war between the teams A and B, the rope breaks at a point which is nearer to A. Then

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

  1. A has applied more force

  2. B has applied more force

  3. A and B both have applied same force

  4. Neither has applied any force

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Correct Option: C

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

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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

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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

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Correct Option: C
Explanation:

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