Physics MCQs for NEET — Practice Questions with Answers

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The dimensional formula of pressure is 

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Explanation

P=FA=MLT-2L2=ML-1T-2

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Light year is a unit of    

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Explanation

Light year is a distance which light travels in one year.

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The magnitude of any physical quantity :

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Explanation

Because magnitude is absolute.

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Newton–second is the unit of  

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Explanation

Impulse = change in momentum = F × t

So the unit of momentum will be equal to Newton-sec.

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Which of the following is not represented in correct unit  

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Explanation

Option a : Stress = ForceArea = Newton (N)Metre2 = N/m2

                Strain = Fractional change in length = ∆ll= Dimensionless

So , StressStrain = ML-1T-2

Option b : Surface tension = ForceLength=Newton (N)metre (m) = N/m

Option c : Energy = Force X Displacement = Newton X Metre = N X m

Option d :Pressure =ForceArea = Newton (N)Metre2 = N/m2

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One second is equal to :

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Explanation

It is by standard definition.

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One nanometre is equal to 

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A micron is related to centimetre as

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Explanation

1  micron=10−6m=10−4cm

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The unit of power is :

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Explanation

Watt = Joule/sec=watt

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SI unit of pressure is

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Explanation

Pressure=Force/AreaP=N/m2=Pascal

 

 

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