Physics · Science General

Units and Measurement

1,044 Questions

Master the fundamentals of physics with these practice questions on units and measurement. The topics include fundamental SI units, derived quantities, and specific units for power, force, and light. These questions are essential for building a strong foundation for competitive exams.

SI fundamental unitsUnits of powerDerived quantities unitsThermal energy unitsVolume measurement unitsElectric current units

Units and Measurement Questions

Multiple choice physics gravitational fields representing a gravitational field gravitational field circular motion and gravitation

The unit of (V) Gravitational Potential is

  1. $\dfrac{\text{Joule}}{kg}$
  2. $\text{Joule}$
  3. $\dfrac{\text{Joule}}{s}$
  4. $\dfrac{kg}{\text{Joule}}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gravitational potential is defined as the Gravitational energy per unit mass of the object on the planet. Unit of energy is always joule in SI units. Hence that of potential will be Joule/kg.

Multiple choice stefan's law black body radiation heat transfer thermal properties physics

Match the physical quantities given in Column I with their SI units given in Cloumn II :

Column-I Column-II
(a) Thermal conductivity (p) Wm$^{-2}$K$^{-4}$
(b) Stefans constant (q) m-K
(c) Wiens constant (r) J kg$^{-1}$K$^{-1}$
(d) Specific heat (s)Wm$^{-1}$K$^{-1}$

  1. a-s, b-p, c-q, d-r

  2. a-s, b-p, c-r, d-q

  3. a-s, b-r, c-p, d-q

  4. a-r, b-s, c-p, d-q
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Thermal conductivity =$\dfrac{Watt}{Metre.Kelvin}$

Stefan's constant $=5.64\times$ ${10}^{-8}$$\dfrac { w }{ { m }^{ 2 }{ K }^{4}}$

Wien's constant $={\lambda}{\theta}={constant}={Metre}  {Kelvin}$

Specific heat $=\dfrac{Joule} {{Kg}  {Kelvin}}$

Multiple choice

What is the fundamental unit of information in quantum mechanics?

  1. Qubit

  2. Bit

  3. Byte

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

In quantum mechanics, the fundamental unit of information is the qubit, which can exist in a superposition of states, unlike the classical bit that can only be in one state at a time.

Multiple choice

The SI unit of force is the:

  1. Newton (N)

  2. Kilogram (kg)

  3. Meter (m)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of force is the Newton (N), named after Sir Isaac Newton. It is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

Multiple choice

What is the SI unit of temperature?

  1. Fahrenheit

  2. Celsius

  3. Kelvin

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

The SI unit of temperature is Kelvin.

Multiple choice

What is the SI unit of viscosity?

  1. Pascal-second (Pa·s)

  2. Newton-second (N·s)

  3. Poise (P)

  4. Stokes (St)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of viscosity is the pascal-second (Pa·s). It is defined as the shear stress required to produce a unit velocity gradient in a fluid.

Multiple choice

What is the SI unit of conductivity?

  1. Siemens per meter (S/m)

  2. Ohms per meter (Ω/m)

  3. Farads per meter (F/m)

  4. Henrys per meter (H/m)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of conductivity is Siemens per meter (S/m).

Multiple choice

What is the fundamental unit of measurement in photometry?

  1. Candela

  2. Lumen

  3. Lux

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

The candela is the SI unit of luminous intensity, which is the measure of the luminous power emitted by a light source in a particular direction.

Multiple choice

What is the fundamental unit of measurement in astrometry?

  1. Light-year

  2. Parsec

  3. Astronomical unit

  4. Degree
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The degree is the fundamental unit of measurement in astrometry, representing 1/360th of a circle.

Multiple choice

The SI unit of electric current is the:

  1. Ampere

  2. Volt

  3. Ohm

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

The SI unit of electric current is the ampere, which is defined as the flow of one coulomb of charge per second.

Multiple choice

Which of the following is a scalar quantity?

  1. Force

  2. Energy

  3. Momentum

  4. Temperature
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Temperature is a scalar quantity because it has only magnitude and no direction.

Multiple choice

The SI unit of mass is the:

  1. Kilogram

  2. Gram

  3. Pound

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

The SI unit of mass is the kilogram, which is defined as the mass of a specific platinum-iridium cylinder kept at the International Bureau of Weights and Measures in France.

Multiple choice

The SI unit of length is the:

  1. Meter

  2. Centimeter

  3. Inch

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

The SI unit of length is the meter, which is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

Multiple choice

Which of the following is a unit of energy?

  1. Joule

  2. Calorie

  3. British thermal unit

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

The SI unit of energy is the joule, but calories, British thermal units, and electronvolts are also commonly used units of energy.