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Units and Measurements — Questions and Answers

Units and Measurements questions ask which unit belongs to which quantity, and how the SI system is organised. The seven base units and the standard derived units account for nearly every question, and knowing which quantities are fundamental rather than derived resolves most of the rest.

10 solved questionsGeneral ScienceFree · no signup

Units and Measurements— Concepts, Formulas & Shortcuts

  • The seven SI base units: metre, kilogram, second, ampere, kelvin, mole, candela.
  • Derived units: newton (force), joule (energy), watt (power), pascal (pressure), hertz (frequency).
  • Temperature in SI is measured in kelvin, not degrees Celsius.
  • The unit of luminous intensity is the candela; of amount of substance, the mole.
  • 1 light year is a unit of DISTANCE, not time — about 9.46 × 10¹² km.
  • Prefixes: kilo 10³, mega 10⁶, giga 10⁹, milli 10⁻³, micro 10⁻⁶, nano 10⁻⁹.

Units and Measurements Practice Questions with Answers

Attempt each question first, then open the explanation. All 10 questions below are free to read and require no signup.

  1. Q1.How many base units are there in the SI system?

    Moderate
    • AFive
    • BSix
    • CSeven
    • DEight
    +Show Answer & Explanation

    Answer: C. Seven

    Explanation: The seven base units are metre, kilogram, second, ampere, kelvin, mole and candela.

    Units and Measurements question 1 of 10

  2. Q2.A light year is a unit of:

    Moderate
    • ATime
    • BDistance
    • CSpeed
    • DBrightness
    +Show Answer & Explanation

    Answer: B. Distance

    Explanation: It measures the distance light travels in one year — roughly 9.46 × 10¹² km.

    Units and Measurements question 2 of 10

  3. Q3.The SI unit of temperature is the:

    Moderate
    • ADegree Celsius
    • BDegree Fahrenheit
    • CKelvin
    • DCalorie
    +Show Answer & Explanation

    Answer: C. Kelvin

    Explanation: Kelvin is the SI base unit of thermodynamic temperature.

    Units and Measurements question 3 of 10

  4. Q4.The SI unit of pressure is the:

    Easy
    • ANewton
    • BPascal
    • CJoule
    • DWatt
    +Show Answer & Explanation

    Answer: B. Pascal

    Explanation: One pascal is one newton per square metre.

    Units and Measurements question 4 of 10

  5. Q5.The SI unit of frequency is the:

    Easy
    • AHertz
    • BWatt
    • COhm
    • DTesla
    +Show Answer & Explanation

    Answer: A. Hertz

    Explanation: One hertz is one cycle per second.

    Units and Measurements question 5 of 10

  6. Q6.The prefix "nano" represents a factor of:

    Moderate
    • A10⁻³
    • B10⁻⁶
    • C10⁻⁹
    • D10⁻¹²
    +Show Answer & Explanation

    Answer: C. 10⁻⁹

    Explanation: Nano means one billionth, or 10⁻⁹.

    Units and Measurements question 6 of 10

  7. Q7.The SI unit of amount of substance is the:

    Moderate
    • AGram
    • BMole
    • CLitre
    • DCandela
    +Show Answer & Explanation

    Answer: B. Mole

    Explanation: The mole measures the amount of substance, containing Avogadro's number of entities.

    Units and Measurements question 7 of 10

  8. Q8.Which of these is a derived unit rather than a base unit?

    Difficult
    • AMetre
    • BKilogram
    • CNewton
    • DSecond
    +Show Answer & Explanation

    Answer: C. Newton

    Explanation: The newton is derived as kg·m/s²; the other three are SI base units.

    Units and Measurements question 8 of 10

  9. Q9.The unit of luminous intensity is the:

    Difficult
    • ALumen
    • BLux
    • CCandela
    • DWatt
    +Show Answer & Explanation

    Answer: C. Candela

    Explanation: The candela is the SI base unit of luminous intensity.

    Units and Measurements question 9 of 10

  10. Q10.One kilometre equals how many metres?

    Easy
    • A10
    • B100
    • C1,000
    • D10,000
    +Show Answer & Explanation

    Answer: C. 1,000

    Explanation: The prefix kilo means one thousand.

    Units and Measurements question 10 of 10

Units and Measurements — Frequently Asked Questions

Is a light year a unit of time?+

No — it is a unit of distance, equal to the distance light travels in one year, about 9.46 trillion kilometres. This is one of the commonest trick questions in general science papers.

How many base units does the SI system have?+

Seven: metre, kilogram, second, ampere, kelvin, mole and candela. Every other SI unit is derived from combinations of these.

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