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Questions Related to physics

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

On a hypothetical scale X, the ice point in ${ 40 }^{ \circ  }$ and then steam point is ${ 120 }^{ \circ  }$. For another scale Y the ice point and stem points are ${ -30 }^{ \circ  }$ and ${ 130 }^{ \circ  }$ respectively. If X-reads ${ 50 }^{ \circ  }$ The read of Y is 

  1. $-{ 5 }^{ \circ }$

  2. $-{ 8 }^{ \circ }$

  3. $-{ 10 }^{ \circ }$

  4. $-{ 12 }^{ \circ }$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Scale X: (50 - 40) / (120 - 40) = 10 / 80 = 1/8. Scale Y: (T_y - (-30)) / (130 - (-30)) = (T_y + 30) / 160. Setting them equal: 1/8 = (T_y + 30) / 160. 20 = T_y + 30. T_y = -10.

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

$1$ Newton$=$ $K$ dyne, then what is the value of $K$?

  1. $1$

  2. $10^2$

  3. $10^5$

  4. $10$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Newton is in SI units that is Kg metre per second whereas Dyne is in Gram centimetre per second.

We know that $1 Kg = 1000 gm$ where as $1 metre = 100 cm$.
Hence to convert from SI units to CGS unit, we will have to multiply by a factor that is $1000\times100$.
$K=10^{5}$

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

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

  1. Impulse

  2. Force

  3. Angular velocity

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

Impulse $(I)$ imparted to the body is equal to the change in linear momentum $(\Delta p)$ of the body.


Impulse, $I=\Delta p$

Thus momentum has the same units as that of impulse. Since momentum has S.I. unit as $kgms^{-1}$, impulse also has S.I. unit as $kgms^{-1}$.

Multiple choice physics dynamics - explaining motion system of unit summary of si units system of units

If 1 g cm$^{-3} = 10^3\,kg\, m^{-3}$ then $10^6kgm^{-3}=$

  1. $10^{-3}\,g\,cm^{-3}$

  2. $10^{6}\,g\,cm^{-3}$

  3. $10^{3}\,g\,cm^{-3}$

  4. $10^{-6}\,g\,cm^{-3}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Given, $1 g cm^{-3}=10^3 kgm^{-3}$

If we multiply $10^3$ on both sides, $10^3 g cm^{-3}=10^3\times 10^3 kgm^{-3}$
or $10^3 g cm^{-3}=10^6 kgm^{-3}$
Thus, option C will be the right option.