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 of electric current is the:

  1. Ampere

  2. Volt

  3. Ohm

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

The SI unit of electric current is the ampere, which is defined as the flow of one coulomb of charge per second.

Multiple choice

The SI unit of mass is the:

  1. Kilogram

  2. Gram

  3. Pound

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

The SI unit of mass is the kilogram, which is defined as the mass of a specific platinum-iridium cylinder kept at the International Bureau of Weights and Measures in France.

Multiple choice

The SI unit of length is the:

  1. Meter

  2. Centimeter

  3. Inch

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

The SI unit of length is the meter, which is defined as the distance traveled by light in a vacuum in 1/299,792,458 of a second.

Multiple choice

Which of the following is a unit of energy?

  1. Joule

  2. Calorie

  3. British thermal unit

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

The SI unit of energy is the joule, but calories, British thermal units, and electronvolts are also commonly used units of energy.

Multiple choice

The SI unit of electric charge is the:

  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, which is defined as the amount of charge carried by one mole of electrons.

Multiple choice

Which of the following is a unit of power?

  1. Watt

  2. Horsepower

  3. British thermal unit per hour

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

The SI unit of power is the watt, but horsepower, British thermal units per hour, and calories per second are also commonly used units of power.

Multiple choice

The SI unit of temperature is the:

  1. Kelvin

  2. Celsius

  3. Fahrenheit

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

The SI unit of temperature is the kelvin, which is defined as 1/273.16 of the thermodynamic temperature of the triple point of water.

Multiple choice

Which of the following is a unit of pressure?

  1. Pascal

  2. Atmosphere

  3. Bar

  4. Pound per square inch
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

The SI unit of pressure is the pascal, but atmospheres, bars, and pounds per square inch are also commonly used units of pressure.

Multiple choice

The SI unit of volume is the:

  1. Cubic meter

  2. Liter

  3. Gallon

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

The SI unit of volume is the cubic meter, which is defined as the volume of a cube with sides of one meter.

Multiple choice

Which of the following is a unit of frequency?

  1. Hertz

  2. Cycle per second

  3. Revolutions per minute

  4. Beats per minute
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

The SI unit of frequency is the hertz, which is defined as one cycle per second. Cycles per second, revolutions per minute, and beats per minute are also commonly used units of frequency.

Multiple choice

What is the standard unit of measurement for grip strength?

  1. Newtons (N)

  2. Kilograms (kg)

  3. Pounds (lbs)

  4. Watts (W)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Grip strength is typically measured in kilograms, representing the amount of weight a person can hold or squeeze.

Multiple choice

The SI unit of electric current is:

  1. Ampere

  2. Volt

  3. Ohm

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

The SI unit of electric current is Ampere, which represents the flow of one coulomb of charge per second.

Multiple choice

What is the unit of measurement for the amount of light emitted by a light bulb?

  1. Watts

  2. Lumens

  3. Kelvin

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

Lumens measure the total amount of visible light emitted by a light source.

Multiple choice

What is the unit of measurement for the AQI?

  1. Parts per million (ppm)

  2. Micrograms per cubic meter (µg/m³)

  3. Air Quality Index Units (AQIU)

  4. Milligrams per liter (mg/L)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The AQI is expressed in Air Quality Index Units (AQIU), which are calculated based on the concentrations of various air pollutants.

Multiple choice

What is the unit of measurement for parallax?

  1. Parsecs

  2. Light-years

  3. Astronomical units

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

Parallax is measured in arcseconds, which is a unit of angular measurement.