Tag: physics

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Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

The SI units of mass and weight are ______

  1. kg and kg

  2. N and kg

  3. kg and N

  4. N and N
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Mass is intrinsic nature of any object or material and it doesn't vary or depend on gravitational field around it.
Weight is the force experienced by an object and it depends on both the mass as well as gravitational field which it experiences in a particular place.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

How watt is related to the fundamental units?

  1. kg m$^2 s^{-3}$
  2. kg m$^2 s^{-2}$
  3. Nm $s^{-1}$

  4. Nm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

SI unit of mass is Kg , acceleration is $ms^{-2}$ ad of velocity is $ms^{-1}$.

Now power is defined as $=$ force $\times  $ velocity, where $F=m\times a$
So, $P=m\times a\times v$ , putting the SI unit of $m, a, v$
We get SI unit of power is $kgm^2s^{-3}$.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Which pair of following quantities has dimensions different from each other. 

  1. Impulse and linear momentum

  2. Planck's constant and angular momentum

  3. Moment of inertia and moment to force

  4. Young's modulus and pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Moment of inertia $=\dfrac { 1 }{ 2 } \times mass\times { \left( Radius\quad of\quad gyration \right)  }^{ 2 }= \left[ { M }^{ 1 }{ L }^{ 2 }{ T }^{ 0 } \right] $


Moment of force $=$ torque $= N.m = $$\left[ { M }^{ 1 }{ L }^{ 2 }{ T }^{ -2 } \right] $

Both are different from each other.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Identify the uncommon quantity

Weight, spring balance, newton, kilogram 

  1. kilogram

  2. Weight

  3. spring balance

  4. newton
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The spring balance is the device used for measurement of weight. The weight of a body is measured in terms of the newton. On the other hand, kilogram is the unit for the mass of the body.


Therefore, spring balance, weight and Newton are related to the same thing i.e.the weight of a body whereas the kilogram is related to the mass of the body. So, kilogram is different.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Identify the common unit used to measure energy?

  1. Newtons

  2. Joules

  3. Grams

  4. Meters

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

Newton is the unit of force.

Joules is the SI unit of energy. It is equivalent to newton-meter($N-m$).
Grams is a unit of mass.
Meter is the SI unit of distance.
A liter is a unit of volume and equivalent to $dm^3$.

Therefore option $B$ is correct.

Multiple choice physics measurements and units some examples of derived units fundamental and derived quantities fundamental and derived units

Identify the derived quantities among the following.

  1. Gravitational constant

  2. Frequency

  3. Electric charge

  4. Electric current
Reveal answer Fill a bubble to check yourself
A,B,C Correct answer
Explanation

The derived quantities are the one which depends on the other fundamental quantities for their representation. Among the following quantities, an electric current is a fundamental quantity whereas gravitational constant, frequency and electric charge are the derived quantities.