QCM : Fundamentals of Physical Quantities and Measurements — 7 questions

Explication

A measurable quantity is a physical property that can be measured or calculated and is expressed with a unit and symbol, which aligns with the definition provided in the course context.

Explication

A balance is used to measure the mass of an object, as explicitly mentioned in the content. Thermometers measure temperature, barometers measure atmospheric pressure, and voltmeters measure electrical potential difference, so they are not used for mass measurement.

Explication

The main role of SI units and symbols is to provide a universal standard for measurement and communication, ensuring consistency and clarity across different contexts and disciplines.

Explication

The SI system was officially adopted in 1960 by the General Conference on Weights and Measures, marking its formal establishment as the international standard for measurement units.

Explication

Mass and length are both measurable physical quantities, but they differ in how they are measured; mass is directly measured using a balance, while length is measured with a ruler or measuring tape. The correct option highlights this difference in measurement method, which is a fundamental distinction in how these quantities are handled.

Explication

Alessandro Volta is credited with proposing the concept of electric potential difference, which is a fundamental electrical quantity, and he invented the voltaic pile, the first chemical battery.

Explication

Increasing the frequency of an electromagnetic wave often results in an increase in the power transmitted, especially when considering factors like energy per photon or wave amplitude, depending on the system. This demonstrates a cause-effect relationship where higher frequency can lead to higher power transfer.