General Physics 1

Which of the following is NOT a fundamental quantity?

• Length

• Time

• Force

• Temperature

Answer explanation

Force is derived from fundamental quantities (mass, length, time) and is not a fundamental quantity itself. Length, time, and temperature are all considered fundamental quantities in physics.

Which of the following units is part of the SI system?

• Foot

• Meter

• Pound

• Gallon

Answer explanation

The meter is the base unit of length in the SI system, while the foot, pound, and gallon are units from the imperial system. Therefore, the correct answer is meter.

Which system of units is used in the International System of Measurements (SI)?

• cgs

• fps

• mks

• Both a and c

Answer explanation

The International System of Measurements (SI) is based on the mks system, which uses meters, kilograms, and seconds as its base units. The cgs system (centimeter, gram, second) and fps system (foot, pound, second) are not part of SI.

What is the base unit of luminous intensity in the SI system?

• Candela

• Lumen

• Watt

• Joule

Answer explanation

The base unit of luminous intensity in the SI system is the candela. It measures the amount of light emitted in a particular direction, making it the correct choice over lumen, watt, and joule.

Which of the following is an example of a derived unit?

• Meter

• Kilogram

• Candela

• Newton

Answer explanation

A derived unit is formed from base units. The Newton is a derived unit of force, defined as kg·m/s², while meter, kilogram, and candela are base units. Therefore, the correct answer is Newton.

In which of the following systems is the unit 'foot' used?

• mks

• cgs

• fps

• SI

Answer explanation

The 'foot' is a unit of length used in the fps (foot-pound-second) system, which is a customary system of measurement. It is not used in mks (meter-kilogram-second), cgs (centimeter-gram-second), or SI (International System of Units).

Which of the following best defines measurement?

• A process of comparing two quantities using numbers.

• A process of estimating quantities without using units.

• A process of comparing one quantity with a standard unit.

• A process of converting quantities from one unit to another.

Answer explanation

The correct choice defines measurement as comparing two quantities using numbers, which captures the essence of measurement. Other options either lack precision or do not involve numerical comparison.

Which statement is true about derived quantities?

• They are the same as fundamental quantities.

• They have no relation to fundamental quantities.

• They do not have any units associated with them.

• They are defined in terms of the seven fundamental quantities.

Answer explanation

Derived quantities are defined in terms of the seven fundamental quantities, such as velocity and force, which are calculated using these basic units. This makes the correct statement true.

What is the main difference between the Metric and English systems of measurement?

• The Metric system is less accurate than the English system.

• The English system uses decimal-based calculations, while the Metric system does not.

• The English system is based on human body parts, while the Metric system uses prefixes and base-10 units.

• The Metric system uses feet, pounds, and seconds, while the English system uses meters, kilograms, and seconds.

Answer explanation

The correct choice highlights that the English system is historically based on human body parts (like inches and feet), while the Metric system is structured around prefixes and base-10 units, making it more systematic.

What is the significance of dimensional analysis?

• It checks the mathematical accuracy of equations.

• It converts units between different dimensions.

• It ensures equations are dimensionally consistent.

• It determines the physical nature of a quantity.

Answer explanation

Dimensional analysis is crucial as it ensures equations are dimensionally consistent, meaning both sides of an equation must have the same dimensions. This helps validate the correctness of physical equations.