Free Measurements MCQs with Answers

71. The SI unit of force is:

• A. Newton
• B. Dyne
• C. Slug
• D. Foot-pound

Explanation: The Newton is the SI unit of force and is defined as the force required to accelerate a one-kilogram mass at a rate of one meter per second squared. Mathematically, 1 Newton (N) is equivalent to 1 kg⋅m/s2.

72. The SI unit of energy is:

• A. Joule
• B. Calorie
• C. Slug
• D. Electron volt

Explanation: The Joule is the SI unit of energy and is defined as the amount of work done when a force of one Newton acts on a point that moves one meter in the direction of the force. Mathematically, 1J=1N⋅m. The Joule is a fundamental unit in the International System of Units (SI) and is widely used to measure various forms of energy, including mechanical, thermal, and electromagnetic energy.

73. In the international system of units, the unit of mass is:

• A. Gram
• B. Kilogram
• C. Milligram
• D. Pound

Explanation: The kilogram is the fundamental unit of mass in the SI system. It is defined as the mass of the international prototype of the kilogram, a platinum-iridium alloy cylinder kept at the International Bureau of Weights and Measures (BIPM) in France. The kilogram is used as the base unit for mass in the SI system, and all other units of mass are derived from it.

74. The SI unit of power is:

• A. Horse power
• B. Joule
• C. Calorie
• D. None of the above

Explanation: Option D is correct. The SI unit of power is indeed the Watt (W). One watt is equal to one joule per second. It is the standard unit for measuring power in the International System of Units.

75. The number of fundamental units of measurement in science is:

• A. Four
• B. Five
• C. Three
• D. Seven

Explanation: The number of fundamental units of measurement in science is typically considered to be seven. These are the basic units from which all other units can be derived. The seven SI (International System of Units) base units are:

76. In the SI system, how many base units are there?

• A. Three
• B. Five
• C. Seven
• D. Nine

Explanation: The number of fundamental units of measurement in science is typically considered to be seven. These are the basic units from which all other units can be derived. The seven SI (International System of Units) base units are: Meter (m): This unit represents length or distance. Kilogram (kg): This unit represents mass. Second (s): This unit represents time. Ampere (A): This unit represents electric current. Kelvin (K): This unit represents temperature. Mole (mol): This unit represents amount of substance. Candela (cd): This unit represents luminous intensity.

77. The maximum possible error in the reading for a meter rod (with a least count of 1 mm) is:

• A. ± 0.1 mm
• B. 0.5 cm
• C. 0.05 cm
• D. 1 mm

Explanation: Explanation of this question will be added soon!

78. The branch of science which deals with properties of matter, energy and their relationship is called:

• A. Physics
• B. Chemistry
• C. Mechanics
• D. Magnetism

Explanation: Physics is the correct answer. It is the branch of science that studies the fundamental principles governing the behavior of matter and energy. Physicists seek to understand the basic laws and forces that govern the universe, from the smallest particles at the quantum level to the vast structures of galaxies. Physics is a broad field that encompasses various sub-disciplines such as classical mechanics, electromagnetism, thermodynamics, quantum mechanics, and relativity.

79. The branch of science which deals with forces acting on bodies in motion, is called:

• A. Chemical Physics
• B. Mechanics
• C. Magnetism
• D. Medical Physics

Explanation: Mechanics is the correct answer. It is a branch of physics that deals with the study of motion, forces, and energy, particularly the effects of forces on the motion of objects. Classical mechanics, which includes Newtonian mechanics and Lagrangian mechanics, provides the foundation for understanding the behavior of objects in motion under the influence of forces.

80. The branch of physics that deals with structure of atom and properties of atom is:

• A. Atomic Physics
• B. Nuclear Physics
• C. Mechanics
• D. None of these

Explanation: Atomic physics is the correct answer. It is a branch of physics that focuses on the study of atoms, including their structure, behavior, and interactions. Atomic physicists investigate the electronic structure of atoms, the behavior of electrons, and the interactions between electrons and electromagnetic radiation. Topics within atomic physics include atomic spectroscopy, quantum mechanics applied to atoms, and the understanding of atomic energy levels.