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

What is the SI unit of temperature?

  1. Kelvin (K)

  2. Celsius (°C)

  3. Fahrenheit (°F)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of temperature is Kelvin (K), named after the British physicist Lord Kelvin.

Multiple choice

Which of the following is NOT a fundamental unit in the International System of Units (SI)?

  1. Meter (m)

  2. Kilogram (kg)

  3. Second (s)

  4. Ampere (A)

  5. Kelvin (K)
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Kelvin is the SI unit of thermodynamic temperature, not a fundamental unit.

Multiple choice

What is the SI unit of electric charge?

  1. Coulomb (C)

  2. Ampere (A)

  3. Volt (V)

  4. Ohm (Ω)

  5. Farad (F)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Coulomb is the SI unit of electric charge, representing the amount of charge carried by one electron.

Multiple choice

What is the standard unit used to measure film speed?

  1. ISO

  2. ASA

  3. DIN

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

Film speed is typically measured in ISO, ASA, or DIN units, which are equivalent to each other.

Multiple choice

What is the SI unit of magnetic field strength?

  1. Tesla (T)

  2. Gauss (G)

  3. Ampere per meter (A/m)

  4. Weber per square meter (Wb/m^2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of magnetic field strength is Tesla (T), named after the Serbian-American electrical engineer Nikola Tesla.

Multiple choice

What is the fundamental unit of matter?

  1. Atom

  2. Molecule

  3. Electron

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

An atom is the fundamental unit of matter because it is the smallest unit that retains the chemical properties of an element.

Multiple choice

The SI unit of thermal conductivity is:

  1. Watts per meter-Kelvin (W/m-K)

  2. Joules per kilogram-Kelvin (J/kg-K)

  3. Calories per gram-degree Celsius (cal/g-°C)

  4. British thermal units per hour-foot-Fahrenheit (Btu/hr-ft-°F)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of thermal conductivity is watts per meter-Kelvin (W/m-K), which represents the amount of heat transferred through a material per unit area and temperature difference.

Multiple choice

The SI unit of specific heat is:

  1. Joules per kilogram-Kelvin (J/kg-K)

  2. Calories per gram-degree Celsius (cal/g-°C)

  3. British thermal units per pound-degree Fahrenheit (Btu/lb-°F)

  4. Watts per meter-Kelvin (W/m-K)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of specific heat is joules per kilogram-Kelvin (J/kg-K), which represents the amount of heat required to raise the temperature of one kilogram of a material by one Kelvin.

Multiple choice

The SI unit of thermal expansion is:

  1. Meters per Kelvin (m/K)

  2. Degrees Celsius per meter (°C/m)

  3. Parts per million per Kelvin (ppm/K)

  4. Inverse Kelvin (1/K)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The SI unit of thermal expansion is meters per Kelvin (m/K), which represents the change in length of a material per unit length and temperature change.

Multiple choice

What is the SI unit of entropy?

  1. Joule per Kelvin

  2. Kelvin per Joule

  3. Joule

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

The SI unit of entropy is Joule per Kelvin (J/K).

Multiple choice

What is the basic unit of matter according to modern science?

  1. Atom

  2. Molecule

  3. Electron

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

According to modern science, the basic unit of matter is the atom, which is composed of a nucleus and electrons.

Multiple choice

What is the SI unit of activity?

  1. Becquerel

  2. Curie

  3. Gray

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

The SI unit of activity is the becquerel (Bq), which is defined as one disintegration per second.

Multiple choice

Which of the following is a fundamental unit in the International System of Units (SI)?

  1. meter

  2. kilogram

  3. second

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

The meter is the fundamental unit of length in the SI system.

Multiple choice

A vector quantity has both:

  1. magnitude and direction

  2. magnitude and unit

  3. direction and unit

  4. unit and dimension
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A vector quantity is characterized by both its magnitude and its direction.

Multiple choice

Which of the following is a unit of energy?

  1. joule

  2. watt

  3. newton

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

The joule is the SI unit of energy.