Free Measurements MCQs with Answers

81. The Islamic era (600-1500 AD) is also known as:

• A. Historical era
• B. Muslim period
• C. British era
• D. Greek period

Explanation: This is a more specific term that refers to the time when Islamic civilization flourished and made significant contributions to various fields such as science, mathematics, medicine, philosophy, and the arts. The term "Muslim period" is not as commonly used as the Islamic Golden Age but can still convey the idea of the era when Islamic culture and civilization thrived.

82. Archimedes is also known as the founder of which physics?

• A. Optical
• B. Mathematical
• C. Bio-chemical
• D. Modern

Explanation: Archimedes is often referred to as one of the greatest mathematicians of antiquity. His work in mathematics was groundbreaking, covering a wide range of topics, including geometry, calculus, and the mathematical principles underlying physical phenomena. The use of mathematical methods to solve physical problems is a hallmark of Archimedean physics.

83. Complete the following statement: Kepler and _ established the fundamental ideas of celestial mechanics.

• A. Newton
• B. Faraday
• C. Galileo
• D. Thales

Explanation: Galileo Galilei, an Italian scientist, made significant contributions to astronomy and physics during the 17th century. He conducted observations of the Moon, Jupiter's moons, and other celestial bodies using a telescope, challenging the geocentric model of the universe. While Galileo contributed to our understanding of the heavens and the fundamental ideas of celestial mechanics.

84. "Candela" is the unit name of which quantity?

• A. Time
• B. Intensity
• C. Mole
• D. Meter

Explanation: The candela (cd) is the SI unit for luminous intensity. Luminous intensity is a measure of the amount of light emitted in a particular direction. It takes into account the sensitivity of the human eye to different wavelengths of light. The candela is defined based on the perceived brightness of a light source, making it a unit related to human vision.

85. The unit name of temperature is:

• A. Degree or Kelvin
• B. Candela
• C. Mole
• D. Kilogram

Explanation: Temperature can be measured in either degrees Celsius (°C) or Kelvin (K). The degree Celsius is a unit of temperature in the Celsius scale, where 0°C is the freezing point of water and 100°C is the boiling point of water at standard atmospheric pressure. The Kelvin, on the other hand, is the SI unit of temperature. It is an absolute temperature scale with the same increments as degrees Celsius, but its zero point (absolute zero) is 0 K, representing the point at which all molecular motion ceases.

86. "Ampere" is the unit of:

• A. Intensity
• B. Electric current
• C. Temperature
• D. Candela

Explanation: The Ampere (A) is the base unit of electric current in the International System of Units (SI). One Ampere is defined as the flow of one Coulomb of charge per second. Electric current is the flow of electric charge through a conductor and is a fundamental concept in electricity.

87. The supplementary units are known as:

• A. Derived units
• B. Small units
• C. Positive units
• D. None of these

Explanation: Option D is appropriate in the sense that "supplementary units" is not a standard term. The classification used in the SI is between base units and derived units. Instead, we use the terms "base units" and "derived units" to categorize units based on their fundamental nature.

88. The length is measured in:

• A. Kilometers
• B. Seconds
• C. Grams
• D. Kilograms

Explanation: Kilometers (km) are a unit of length commonly used in the metric system. One kilometer is equal to 1,000 meters. It is a standard unit for measuring longer distances, such as the length of roads, distances between cities, and other large-scale measurements.

89. The rounded-off figure of 46.55 is:

• A. 46.6
• B. 46.55
• C. 45.56
• D. None of these

Explanation: The following is the solution: To round 46.55 to one digit or place after the decimal point, we have to eliminate the last digit in 46.55. To eliminate the last digit, we use the following One Decimal Place rules to get the answer: One Decimal Place Rule #1: If the last digit in 46.55 is less than 5, then remove the last digit. One Decimal Place Rule #2: If the last digit in 46.55 is 5 or more and the second to the last digit in 46.55 is less than 9, then remove the last digit and add 1 to the second to the last digit. One Decimal Place Rule #3: If the last digit in 46.55 is 5 or more and the second to the last digit in 46.55 is 9, then remove the last digit, make the second to last digit 0, and add 1 to the number to the left of the decimal place.

90. Newton is the unit of:

• A. Energy
• B. Electricity
• C. Force
• D. None of these

Explanation: The Newton (N) is indeed the unit of force in the SI system. One Newton is defined as the force required to accelerate a one-kilogram mass at a rate of one meter per second squared. Force is a measure of the interaction that can change the motion of an object.