Physics · Science General

Units and Measurement

998 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 chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which temperature scale is the primary unit of measurement and analysis in the physical world?

  1. Celsius Scale

  2. Kelvin Scale

  3. Fahrenheit Scale

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The kelvin is a unit of measure for temperature based upon an absolute scale. It is one of the seven base units in the International System of Units (SI) and is assigned the unit symbol K.
The Kelvin scale is an absolute, thermodynamic temperature scale using as its null point absolute zero, the temperature at which all thermal motion ceases in the classical description of thermodynamics. 
The correct answer is B.
Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which of the following are incorrect SI units?

  1. Amount of substance in mol L$^{-1}$

  2. Pressure of gas in pascal
  3. Density of a solid in kg m$^{-3}$

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

The SI units is based on seven base units. These are metre, kilogram, second, ampere, kelvin, mole and candela.

Here Pascal is SI unit of pressure
Newton is unit of force

Amount of substance has a SI unit $mol/ m^3$
Option A is the incorrect SI Unit.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Units of physical quantities can be expressed in terms of fundamental units and such units are called:

  1. Fundamental units

  2. Derived units

  3. Both a and b

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Units of physical quantities can be expressed in terms of fundamental units and such units are called $\text{derived units}$. 

Unit of area can be an example for derived unit. If $L$ is the length of the square then $L \times L$ is $L^{2}$ is its area. Hence, option A is correct.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

The units of fundamental physical quantities are called

  1. Fundamental units

  2. Derived units

  3. Both a and b

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

The units of fundamental physical quantities are called fundamental units. They are length, mass and time.
Hence option A is correct.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Match the following combinations of electrical units with their terms as single unit:

Electrical unit Single unit
(I) ampere-second A. coulomb
(II) volt-ampere B. ohm
(III) volt-ampere$^{-1}$ C. ampere
(IV) walt/ampere ohm D. watt
(V) joule / ampere second E. volt

  1. A- I B-III C-IV D-II E-V

  2. A- I B-II C-III D-IV E-V

  3. A- V B-IV C-III D-II E-I

  4. A- I B-V C-IV D-II E-III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Electrical unit     Single unit

(I) ampere-second                   coulomb

(II) volt-ampere                         Ampere

(III) volt-ampere$^{-1}$         Volt

(IV) walt/ampere ohm              Ohm

(V) joule / ampere second       Volt

So correct options are A- I B-III C-IV D-II E-V

Hence option A is correct.

Multiple choice chemistry matter around us measurement of properties effect of temperature and pressure on states of matter general introduction: importance and scope of chemistry

Which of the following is the non- derived unit?

  1. Time

  2. Mass

  3. Length

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

Non-derived units or fundamental units are the units which are used to derive other units. The fundamental units are length, mass, temperature, time, electric current, liminous & mole.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Momentum has the same units as that of 

  1. Impulse

  2. Torque

  3. Moment of momentum

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

Impulse applied to an object produces an equivalent vector change in its linear momentum, also in the same direction. The SI unit of impulse is the newton second $(N⋅s)$, and the dimensionally equivalent unit of momentum is the kilogram meter per second $(kg⋅m/s).$

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Momentum has the same units as that of:

  1. impulse

  2. torque

  3. moment of momentum

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

Momentum = mass $\times$ velocity and its unit is $Kgms^{-1}$
Impulse of the force(J) =force $\times$ time and 
$=ma \times t$
$=m\left(\dfrac{u}{t}\right) \times t$
Thus, impulse (J) is the change of momentum and its unit is $Kgms^{-1}$