Physics ยท 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

What is the base unit of time in the SI system?

  1. Meter

  2. Kilogram

  3. Second

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

The base unit of time in the SI system is the second.

Multiple choice

What is the base unit of temperature in the SI system?

  1. Meter

  2. Kilogram

  3. Second

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

The base unit of temperature in the SI system is the Kelvin.

Multiple choice

What is the SI unit of electric charge?

  1. Coulomb

  2. Ampere

  3. Volt

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

The SI unit of electric charge is the coulomb (C), which is defined as the amount of charge that flows through a conductor in one second when a current of one ampere flows through it.

Multiple choice

What is the unit of magnetic flux density?

  1. Tesla

  2. Weber

  3. Ampere

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

The SI unit of magnetic flux density is the tesla (T), which is defined as one weber per square meter.

Multiple choice

What is the unit of inductance?

  1. Henry

  2. Weber

  3. Ampere

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

The SI unit of inductance is the henry (H), which is defined as the inductance of a circuit in which an electromotive force of one volt is induced by a current of one ampere.

Multiple choice

Which of the following is not a unit of work?

  1. Joule

  2. Newton-meter

  3. Watt-second

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

Calorie is a unit of heat, not work.

Multiple choice

What is the SI unit of absorbed dose?

  1. Becquerel

  2. Gray

  3. Sievert

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

The SI unit of absorbed dose is the gray (Gy), which is defined as the absorption of one joule of radiation energy per kilogram of matter.

Multiple choice

What is the SI unit of equivalent dose?

  1. Becquerel

  2. Gray

  3. Sievert

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

The SI unit of equivalent dose is the sievert (Sv), which is defined as the absorbed dose multiplied by a weighting factor that accounts for the biological effectiveness of the radiation.

Multiple choice

What is the SI unit of absorbed dose?

  1. Gray (Gy)

  2. Rad

  3. Sievert (Sv)

  4. Coulomb per kilogram (C/kg)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The gray (Gy) is the SI unit of absorbed dose, which is defined as the amount of energy deposited per unit mass of material.

Multiple choice

What is the SI unit of mass?

  1. Gram

  2. Kilogram

  3. Pound

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

The SI unit of mass is the kilogram (kg).

Multiple choice

Which of the following is not a unit of length?

  1. Meter

  2. Centimeter

  3. Kilometer

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

The second is a unit of time, not length.

Multiple choice

The energy stored in organic matter is measured in:

  1. Joules

  2. Calories

  3. Kilowatt-hours

  4. British Thermal Units
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The energy content of food is typically measured in calories.

Multiple choice

What is the SI unit of temperature?

  1. Celsius

  2. Fahrenheit

  3. Kelvin
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The SI unit of temperature is Kelvin, denoted by K. It is based on absolute zero, which is the lowest possible temperature.

Multiple choice

Which of the following is a unit of heat?

  1. Joule

  2. Calorie

  3. Watt

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

The calorie is a unit of heat energy, commonly used to measure the energy content of food and the heat output of appliances.

Multiple choice

What is the SI unit of work?

  1. Joule

  2. Calorie

  3. Watt

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

The joule is the SI unit of work and energy, representing the amount of work done when a force of one newton is applied through a distance of one meter.