Tag: motion and measurement

Questions Related to motion and measurement

Read the following statements carefully and pick out the correct choice of answer.
A: Electromotive force is expressed in Newtons.
B: Electric intensity is expressed in ${ VC }^{ -1 }$.

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Both A and B are correct.

  2. Both A and B are wrong.

  3. A is correct but B is wrong.

  4. A is wrong but B is correct.

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Correct Option: B
Explanation:

Electromotive force is the voltage developed by any source of electrical energy such as a battery or dynamo. It is generally defined as the electrical potential for a source in a circuit.

It is not a force but voltage and its unit is volt.

Electric intensity at a point is defined as the force experienced per unit positive charge at a point placed in the electric field. 
Its unit is $Newton/Coloumb=NC^{-1}$

Both statements are wrong.

Read the following statements carefully and pick out the correct choice of answer.
A: Susceptibility is expressed as ${ Am }^{ -1 }$.
B: Magnetic flux is expressed ${ JA }^{ -1 }$.

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. A is correct but B is wrong.

  2. A is wrong but B is correct.

  3. Both A and B are wrong.

  4. Both A and B are correct.

Show answer
Correct Option: B
Explanation:

Susceptibility is unit less.
Magnetic flux is expressed $Vs$ or $[M^1L^2T^{-2}A^{-1}] = JA^{-1}$.


Hence, option B is correct.

India adopted metric system of units in

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. 1947

  2. 1950

  3. 1956

  4. 2000

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Correct Option: C
Explanation:

The metric system in weights and measures was adopted by the Indian Parliament in December 1956 with the Standards of Weights and Measures Act, which took effect beginning 1 October 1958. 

Henry is the unit of

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. self inductance (or) mutual inductance

  2. e.m.f

  3. capacity

  4. conductivity

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Correct Option: A
Explanation:

Henry is the unit of Inductance.
Volt is the unit of emf.
Farad is the unit of capacity.
$(\dfrac{1}{\rho})$ is the unit of conductivity.

SI units were introduced in

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. 1960

  2. 1956

  3. 1947

  4. None of these

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Correct Option: A
Explanation:

The International System of Units, universally abbreviated S.I. is the modern metric system of measurement. The S.I. was established in 1960 by the 11th General Conference on Weights and Measures.

$\displaystyle kg{ ms }^{ -1 }$ is the SI unit of 

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Impulse

  2. Force

  3. Angular velocity

  4. None of these

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Correct Option: A
Explanation:

Impulse is defined as the change in momentum and thus impulse has the unit of momentum i.e.  $kg \ m/s$

Velocity gradient is defined as "change in velocity per unit distance". Then its unit in F.P.S. system is ____ .

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. $\displaystyle foot \ { s }^{ -1 }$

  2. $\displaystyle { s }^{ -1 }$

  3. $foot \ s$

  4. $pound \ s$

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Correct Option: B
Explanation:

The velocity gradient is defined as the change in velocity per unit distance.

$Velocity\ gradient=\dfrac{\Delta v}{\Delta x}$

Using the respective dimensions of $v$ and $x$.
$Velocity\ gradient=\dfrac{[LT^{-1}]}{[L]}$

So, its unit will be $sec^{-1}$.

Light travels at maximum speed in-

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Air

  2. Water

  3. Vacuum

  4. None of these

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Correct Option: C
Explanation:

Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3) and 200,000 kilometers per second in glass (refractive index of 1.5). The interaction of the light with the particles in the medius causes the delay.

Kilogram, gram, newton
 The odd one among the above stated quantities is :-
physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. newton

  2. Kilogram

  3. gram

  4. None

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Correct Option: A
Explanation:

Gram and kilogram are the units of mass whereas newton is the unit of weight (force).

What is the full form of S.I. in S.I. system?

physics motion and measurement physical quantities units - definitions and systems physical quantities like mass and weight

  1. Standard initiative

  2. Sponsored initiative

  3. Standard international

  4. Sponsored international

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Correct Option: C
Explanation:

S.I system (standard international system). 

In this system the units of mass, length and time are same, as that of M.K.S system. 
However, it is an enlarged system encompassing all fundamental units.