Physics Unit Measurement Quiz

Newton is the unit to measure ______.

• Power

• Force

• Pressure

• Resistance

Answer explanation

Newton is the unit of measurement for force, defined as the amount of force required to accelerate a one-kilogram mass by one meter per second squared. Therefore, the correct answer is 'Force'.

The SI unit of sound wave frequency was named in honour of which physicist?

• Werner Karl Heisenberg

• Heinrich Rudolf Hertz

• Albert Einstein

• J C Maxwell

Answer explanation

The SI unit of sound wave frequency, the hertz (Hz), is named after Heinrich Rudolf Hertz, who made significant contributions to the study of electromagnetic waves, thus honoring his work in physics.

The work done by a force acting on an object is equal to the amount of force multiplied by the distance travelled in the direction of the force. Which of the following is NOT a unit of work?

• Kgm/sec2

• Kgm2/sec2

• Newton meter

• Joule

Answer explanation

The unit Kgm/sec2 represents force (Newton), not work. Work is measured in Joules, which is equivalent to Kgm2/sec2 (force times distance). Therefore, Kgm/sec2 is NOT a unit of work.

The unit of Force is:

• gms–1

• Kgms–2

• gms–2

• Kgms–1

Answer explanation

The unit of Force is derived from Newton's second law, F = ma. Here, mass (m) is in kilograms (Kg) and acceleration (a) is in meters per second squared (ms–2). Thus, the unit of Force is Kgms–2.

Which of the following is not a unit of temperature?

• Fahrenheit

• Pascal

• Celsius

• Kelvin

Answer explanation

Pascal is a unit of pressure, not temperature. The other options, Fahrenheit, Celsius, and Kelvin, are all recognized units for measuring temperature.

The SI unit of electrical resistivity is ………….

• Ohm-meter

• Ohm

• Coulomb

• Ampere

Answer explanation

The SI unit of electrical resistivity is the Ohm-meter. This unit measures how strongly a material opposes the flow of electric current, making it the correct choice among the options provided.

The commercial unit of electric energy is .......

• watt

• kW

• kilowatt-hour

• joule

Answer explanation

The commercial unit of electric energy is the kilowatt-hour (kWh), which measures energy consumption over time. Other options like watt and joule measure power and energy respectively, but not in commercial terms.

The amount of radiation being emitted by a radioactive material is measured using the conventional unit ––––––.

• Watt

• Pascal

• Ampere

• Curie

Answer explanation

The correct unit for measuring radiation emitted by radioactive materials is the Curie. Other options like Watt, Pascal, and Ampere are not used for this purpose.

What is measured in 'joules'?

• Energy

• Velocity

• Force

• Power

Answer explanation

Energy is measured in joules, which is the standard unit in the International System of Units (SI). Other options like velocity, force, and power have different units, making energy the correct choice.

Henry per meter is the unit of______.

• Watt per steradian

• Electronegativity

• Magnetic permeability

• electrical conductivity

Answer explanation

Henry per meter is the unit of magnetic permeability, which measures how easily a magnetic field can penetrate a material. The other options do not relate to this unit.