Physics ยท 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 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.

Multiple choice

The angstrom unit measures

  1. wave length

  2. lubricants

  3. density

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

The angstrom is a unit of length equal to 10^-10 meters, commonly used to measure the wavelength of light and other electromagnetic radiation.

Multiple choice

Which of the following is the unit of refractive index?

  1. Degree

  2. Kelvin

  3. It has no unit

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

Refractive index is a ratio of two speeds (speed of light in vacuum to speed of light in the medium), so the units cancel out, making it a dimensionless quantity.

Multiple choice

The energy value of food is measured in ____.

  1. newtons

  2. calories

  3. watts

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

The energy content of food is traditionally measured in calories (or kilocalories), which represent the amount of heat energy required to raise the temperature of water.

Multiple choice

To create units of measurement, we have to

  1. select Inventory Info > Units of Measurement > Create

  2. select Inventory Voucher > Units of Measurement > Create

  3. click F11 > Activate Units of Measurement > Select Units of Measurement > Create

  4. None of these

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

To create units of measurement, we have to select inventory info from gateway of tally, then select units of measurement and then create it. For instance pieces is a unit of measurement.

Multiple choice

Which of the following is the unit of pressure?

  1. Steradian

  2. Newton-sec

  3. Pascal-sec

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

The SI unit of pressure is the Pascal (Pa), defined as one Newton per square meter. The other options are not standard units of pressure.