Physics · Science General

Units and Measurement

1,044 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 speed of a printer is measured in

  1. m/s

  2. megahertz

  3. kilowatt

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Printer speed is typically measured in pages per minute (ppm) for text documents or lines per minute (lpm). Since none of the standard units like m/s, megahertz, or kilowatt apply, the correct choice is none of these.

Multiple choice

The S.I. unit of temperature is

  1. celsius

  2. fahrenheit

  3. centigrade

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

The Kelvin scale is the base unit of thermodynamic temperature in the International System of Units (SI).

Multiple choice

Which of the following statements is/are false?

a. For the sake of uniformity, scientists all over the world have accepted centimetric system of measurement. b. A unit that is acceptable to a majority of the people as a basic unit of measurement is called a standard unit. c. When the position of a body does not change with time, with respect to the surroundings, the body is said to be at rest.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option as this statement is false. For the sake of uniformity, scientists all over the world have accepted metric system of measurement.

Multiple choice

Light year is a unit of

  1. distance

  2. light

  3. energy

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

A light year is a unit of astronomical distance representing the distance that light travels in a vacuum in one Julian year. It is approximately 9.46 trillion kilometers or 5.88 trillion miles.

Multiple choice

'Therm' is the unit of

  1. power

  2. heat

  3. light

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

A 'therm' is a unit of heat energy, equivalent to 100,000 British thermal units (BTUs).

Multiple choice

Light year is a unit of

  1. Distance

  2. Time

  3. Motion

  4. Light intensity

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A light-year sometimes written light year or lightyear is a unit of length used in astronomy, though it is often mistaken for a unit of time. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year.

Multiple choice

The amount of atmospheric ozone is expressed in which of the following units?

  1. Ampere unit

  2. Kelvin unit

  3. Pascal unit

  4. Joule unit

  5. Dobson unit
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option. The amount of atmospheric ozone is expressed in Dobson units. The Dobson unit is the most common unit for measuring ozone concentration. One Dobson unit is the number of molecules of ozone that would be required to create a layer of pure ozone 0.01 millimeters thick at a temperature of 0 degrees Celsius and a pressure of 1 atmosphere.

Multiple choice

Electron volt is the unit for

  1. energy

  2. charge of electron

  3. potential difference

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

An electron volt (eV) is a unit of energy equal to the amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt.

Multiple choice

The unit of resolution is

  1. pixels

  2. inches

  3. pixels/inch

  4. pixels/cm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Resolution is typically measured in pixels per inch (PPI) or dots per inch (DPI).