Tag: motion and measurement

Quizzes (11) Questions (114)

Questions Related to motion and measurement

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

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 ${ VC }^{ -1 }$.

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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 ${ JA }^{ -1 }$.

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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


Hence, option B is correct.

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

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

  1. $\displaystyle foot \ { s }^{ -1 }$
  2. $\displaystyle { s }^{ -1 }$
  3. $foot \ s$
  4. $pound \ s$
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $sec^{-1}$.

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

Light travels at maximum speed in-

  1. Air

  2. Water

  3. Vacuum

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Standard initiative

  2. Sponsored initiative

  3. Standard international

  4. Sponsored international
Reveal answer Fill a bubble to check yourself
C Correct answer
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.