Free Measurements MCQs with Answers

101. The SI unit of angular displacement is:

• A. Meter
• B. Foot
• C. Radian
• D. Centimetre

Explanation: The radian (rad) is the SI unit of angular displacement. It is a dimensionless unit that represents the angle subtended when the arc length equals the radius of the circle. One radian is the angle formed when the radius of a circle wraps around the circumference. Angular displacement is often measured in radians because it provides a natural and convenient way to express rotational motion.

102. Candela is the unit of:

• A. Electric Flux
• B. Magnetic induction
• C. Torque
• D. Luminous intensity of light

Explanation: The candela (cd) is the unit of luminous intensity, specifically the intensity of light as perceived by the human eye. It measures the amount of light emitted in a particular direction. One candela is approximately equivalent to the luminous intensity of a specific type of candle flame.

103. The unit of absolute temperature is:

• A. Fahrenheit
• B. Centigrade
• C. Kelvin
• D. None of the above

Explanation: The Kelvin (K) scale is an absolute temperature scale, starting from absolute zero (0 K), which is the lowest possible temperature where particles have minimal thermal motion. The Kelvin scale is commonly used in scientific and engineering contexts, particularly in thermodynamics.

104. The branch of science which deals with the properties of matter and energy along with the interaction between them is known as:

• A. Geography
• B. Biology
• C. Geology
• D. Physics

Explanation: Physics is the branch of science that deals with the fundamental principles governing the behavior of matter and energy. It explores the properties of matter, the nature of forces, motion, energy, heat, sound, light, electricity, magnetism, and the structure of atoms and particles. Physics seeks to understand the fundamental laws of the universe and how objects interact with each other.

105. The branch of physics which deals with the motion of particles and bodies under the action of given force is called:

• A. Solid state Physics
• B. Quantum Mechanics
• C. Mechanics
• D. Nuclear Physics

Explanation: Mechanics is the branch of physics that deals with the study of motion, forces, and energy. Classical mechanics, which includes both Newtonian mechanics and Lagrangian mechanics, is concerned with the motion of macroscopic bodies under the influence of forces. It provides a framework for understanding the motion of objects, whether they are at rest or in motion, and the forces acting upon them.

106. The branch of physics which deals with the structure and properties of atoms as determined by electron outside the nucleus:

• A. Nuclear Physics
• B. Atomic Physics
• C. Particle Physics
• D. Bio Physics

Explanation: Atomic physics is the branch of physics that specifically deals with the study of atoms, which consist of a nucleus (containing protons and neutrons) and electrons orbiting the nucleus. Atomic physics explores the behavior of electrons outside the nucleus, electron configurations, atomic spectra, and the interactions between electrons and photons.

107. The branch of physics which deals with structure, properties and various phenomena regarding nuclei is:

• A. Atomic Physics
• B. Astro Physics
• C. Nuclear Physics
• D. Plasma Physics

Explanation: Nuclear physics is the branch of physics that focuses on the study of atomic nuclei, including their structure, behavior, and interactions. This field investigates nuclear reactions, radioactivity, and the properties of particles within the atomic nucleus.

108. The Muslim scientist who wrote the books on physics, mathematics, astronomy and engineering was:

• A. Abu-Ali-Hussan Ibn-al-Haitham
• B. Al-Beruni
• C. Yaqub Kindi
• D. Muhammad Bin Musa

Explanation: Alhazen, born in 965 CE in Basra (present-day Iraq) and later residing in Cairo, was a polymath who made significant contributions to various scientific fields. He is often referred to as the "father of optics." Alhazen's most famous work is the "Book of Optics," where he explored the properties of light, vision, and the anatomy of the eye. He also wrote extensively on mathematics, astronomy, and engineering, making contributions to the understanding of celestial motion and mechanics. Alhazen's work laid the foundation for the scientific method and had a profound impact on the development of optics.

109. Radio was invented by:

• A. Marconi
• B. Edison
• C. Rutherford
• D. Davison

Explanation: Guglielmo Marconi, an Italian inventor and electrical engineer, is widely credited with the invention of the radio. In the late 19th and early 20th centuries, Marconi conducted experiments in wireless communication and succeeded in transmitting telegraphic signals over long distances without the need for physical wires. He patented his wireless telegraphy system in the late 1890s and conducted successful transatlantic radio communications in the early 1900s. Marconi's work laid the foundation for the development of modern radio technology.

110. In C.G.S. system, the unit of length is:

• A. Foot
• B. Meter
• C. Centimetre
• D. Inch

Explanation: The centimeter is the unit of length in the C.G.S. system. It is equal to one hundredth of a meter (1 cm = 0.01 m). The C.G.S. system is a metric system that uses centimeters, grams, and seconds as its fundamental units for length, mass, and time, respectively.