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

The SI unit for force is

  1. Pascal (Pa)

  2. Newton (N)

  3. Dyne (dyn)

  4. Joule (J)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

2.  The SI unit of force is newton . A force of one newton will accelerate a mass of one kilogram at the rate of one meter per second per second.

Multiple choice

Kilowatt - hour is the unit for

  1. power

  2. electrical energy

  3. voltage

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

2  1 kWh is the amount of electrical energy consumed in 1 hour when the rate of consumption is 1000Joules/second

Multiple choice

Ampere is the SI unit for

  1. potential

  2. voltage (V)

  3. resistance (R)

  4. electric current (i)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

4, The SI unit of electric current

Multiple choice

The SI unit for luminous intensity is

  1. Candela

  2. Volt

  3. Watt

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

1 The candela is defined to be the luminous intensity of a light source producing single-frequency light at a frequency of 540 terahertz (THz) with a power of 1/683 watt per steradian, or 18.3988 milliwatts over a complete sphere cantered at the light source.

Multiple choice

The SI unit for energy is

  1. Joule (J)

  2. Candela

  3. Watt

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

1  the SI unit of work or energy is Joule (J), defined to be the work done by a force of one newton acting to move an object through a distance of one meter in the direction in which the force is applied.

Multiple choice

A light year is a unit for

  1. time

  2. speed of light

  3. length

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

3 The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 1012) kilometers or 5.88 trillion (5.88 × 1012) miles.

Multiple choice

The following is not a fundamental unit

  1. meter

  2. second

  3. gram

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

4   1 volt is equal to the difference of electric potential between two points on a conducting wire carrying a constant current of one ampere when the power dissipated between the points is one watt. Clearly it cannot be a basic unit

Multiple choice

Only three physical quantities length, mass and time are considered to be fundamental quantities in the following unit system

  1. CGS

  2. MKS

  3. FPS

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

4    To measure the fundamental physical quantities Length, Mass and time we have three systems of units, they are (i) C.G.S System (ii)F.P.S System and (iii)M.K.S System. In all these three systems only three physical quantities length, mass and time are considered to be fundamental quantities.But, in systems International (S.I) system there are seven fundamental physical quantities. Which are (i) Length( ii) Mass( iii) Time (iv) Electric current (v) Thermo dynamic temperature (vi) Luminous intensity( vii) Quantity of substance.

Multiple choice

Which of the following has no units?

  1. Thermal capacity

  2. Magnetic susceptibility

  3. Poisson ratio

  4. both (2) and (3)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

4    The ratio of the magnetization of a material to the magnetic field strength is called magnetic susceptibility; it is a tensor when these two quantities are not parallel; otherwise it is a simple number. Poisson ratio is a ratio i.e. a number ( Number is a unit less thing)