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

Which of the following is the unit of pressure?

  1. Pascal

  2. Gauss

  3. Ampere

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

Pascal is the SI unit of pressure, defined as one newton per square meter. Gauss measures magnetic field, Ampere measures electric current, and Newton measures force.

Multiple choice

Which one of the following units represents the largest amount of energy?

  1. Calorie

  2. Joule

  3. Erg

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

1 Calorie = 4.184 Joules, which is much larger than 1 Joule, 1 Erg (10^-7 J), or 1 electron volt (1.6 × 10^-19 J). The Calorie is a unit of thermal energy commonly used in nutrition and represents the largest amount among these options.

Multiple choice

Which one of the following options represents a unit of work?

  1. Newton

  2. Kelvin

  3. Newton-metre

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

The product of force and displacement in the direction of force is known as the work done. So, work = force x distance  The unit of force is Newton and the unit of distance is metre.  Therefore, the unit of work is Newton-metre.

Multiple choice

The SI unit of latent heat is

  1. J/g

  2. J/kg

  3. J/kg K

  4. J/g K
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Latent heat is the amount of energy absorbed or released during a phase change per unit mass. Since it's energy per mass, the SI unit is joule per kilogram (J/kg). J/g K and J/kg K are units for specific heat capacity, which involves temperature change. Latent heat itself has no temperature component.

Multiple choice

The unit of power is

  1. Erg

  2. Watt

  3. Dyne

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

Power is the rate at which work is done or energy is transferred. The SI unit of power is the Watt (W), named after James Watt. One Watt equals one Joule per second. Erg is a unit of energy, Dyne is a unit of force, and Ohm is a unit of electrical resistance.

Multiple choice

Ampere hour is the unit of

  1. electrical energy

  2. electric potential

  3. electric current

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

Correct option is (4).