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

In CGS system the unit of length is

  1. metre

  2. centimetre

  3. decimetre

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

In the CGS (Centimetre-Gram-Second) system, the unit of length is the centimetre.

Multiple choice

Mass is ______ quantity.

  1. chemical

  2. liquid

  3. scalar

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

Mass is a scalar quantity because it has magnitude but no direction.

Multiple choice

The Torque- a power to generate revolutions is expressed as (its unit is kg metre) -

  1. Length of arm (m) x Force (kg)

  2. Length of arm (cm) x Force (kg)

  3. Length of arm (m) x Force (g)

  4. Length of arm (rom) x Force (mg)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Torque is defined as the product of the force applied and the perpendicular distance from the pivot point (the lever arm). In SI units, this is Force (Newtons) * distance (meters), but in the context of the question's units, it is Force (kg) * distance (m).

Multiple choice

Light year is the unit of

  1. Time

  2. Distance

  3. Light

  4. Intensity of light
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A light year is the distance that light travels in a vacuum in one Julian year. It is a unit of distance, not time.

Multiple choice

What is the SI unit of energy?

  1. Watt hour

  2. Joule

  3. Calorie

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

The SI unit of energy is the Joule, which is defined as the work done by a force of one newton over a distance of one meter. Watt hour is a unit of energy, but it is not the SI unit.

Multiple choice

The unit of relative humidity is

  1. Kg/m3

  2. Kg

  3. Kg/m2

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

Relative humidity is a ratio of the amount of water vapor in the air to the maximum amount the air could hold at that temperature. Because it is a ratio of two identical units, it is dimensionless and has no unit.

Multiple choice

The SI unit of latent heat is

  1. J/Kg

  2. Cal /g

  3. J/g

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

Latent heat is defined as the energy required to change the state of a unit mass of a substance. The SI unit for energy is Joules (J) and for mass is kilograms (kg), resulting in J/kg.

Multiple choice

The SI unit of pressure is

  1. Pascal

  2. Watt

  3. Joule

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

The SI unit of pressure is the Pascal (Pa), which is defined as one Newton per square meter.

Multiple choice

The S.I. unit of current is?

  1. Volt

  2. Coulomb

  3. Ampere

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

The SI unit of electric current is the Ampere (A). Volt is the unit for potential difference, and Coulomb is the unit for electric charge.