Tag: physics

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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.

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

Which of the Quantity consists of unit as kg-m/sec ?

  1. Speed

  2. Momentum

  3. Acceleration

  4. Impulse
Reveal answer Fill a bubble to check yourself
B,D Correct answer
Explanation

1.  For Speed :

    $v = \dfrac{distance}{time} = m/sec$

2. For Momentum : 
   $P = m \times v$

   Units :  $kg - m/ sec$

3. For Acceleration :
    $a = \dfrac{\Delta v}{\Delta t}=m/{sec}^2$

4. For Impulse :
    $I =F\times \Delta t = \Delta p$
     Units : $N-sec  = (kg-m/{sec}^2) \times sec = kg-m/sec$

From above we can say that $Momentum$ and $Impulse$ have same unit as kg-m/sec.
      

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

The unit kg $m^2s^{-2}$ is associated with

  1. Work

  2. Kinetic energy

  3. Potential energy

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

$kgm^2s^{-2}$ is the unit of energy. It's dimension is $[ML^2T^{-2}]$ All the quantities given in the option are different form of energy. So their units will be same. Then the unit $kgm^2s^{-2}$ is associated with all of the options.