Free Measurements MCQs with Answers

121. The unit of force, in MKS system is:

• A. Newton
• B. Poundal
• C. Dyne
• D. Watt

Explanation: The newton (N) is the SI unit of force in the MKS system. It is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. The newton is a fundamental unit of force and is widely used in scientific and engineering contexts to measure forces in various applications.

122. The unit of work, in MKS system is:

• A. Erg
• B. Dyne
• C. Watt
• D. Joule

Explanation: The joule (J) is the SI unit of work and energy in the MKS system. One joule is equal to the work done or energy transferred when a force of one newton is applied over a distance of one meter. The joule is a fundamental unit and is widely used to quantify work and energy in various scientific and engineering applications.

123. The unit of power, in MKS system is:

• A. Dyne
• B. Erg
• C. Watt
• D. Joule

Explanation: The watt (W) is the SI unit of power in the MKS system. One watt is equal to one joule of energy per second. It is used to measure the rate at which work is done or the rate of energy transfer. The watt is a fundamental unit of power and is widely used in various scientific and engineering applications.

124. Which one is a unit of time:

• A. Micro
• B. Half Year
• C. Angstrom
• D. Light Year

Explanation: "Half Year" is a unit of time, but it is not a standard unit in the SI system. It is a non-SI unit representing a period of six months or half of a year. While it is used in everyday language, it is not part of the standard set of units.

125. Absolute unit of work in C.G.S. system is:

• A. Foot pound
• B. Erg
• C. Joule
• D. Dyne

Explanation: The erg is the absolute unit of work in the CGS system. It is defined as the work done when a force of one dyne is applied over a distance of one centimeter. Mathematically, 1 erg = 1 dyne × 1 centimeter.

126. The unit of velocity in MKS system can be:

• A. Centimetre/sec
• B. Centimetre/sec2
• C. Meter/sec
• D. Meter/sec2

Explanation: The meter/second (m/s) is the standard unit of velocity in the MKS system. It represents the distance traveled in meters per unit of time in seconds. The formula for velocity (v) is v = distance/time, and when the distance is measured in meters and time in seconds, the unit is meters per second.

127. Meter per second is the unit of:

• A. Acceleration
• B. Velocity
• C. Surface tension
• D. Momentum

Explanation: Velocity is the rate of change of displacement with respect to time. The formula for velocity (v) is given by the change in displacement divided by the change in time. Mathematically, velocity (v) = change in displacement / change in time. In the MKS system, the unit of velocity is meters per second (m/s).

128. Which of the following is fundamental quantity:

• A. Volume
• B. Velocity
• C. Time
• D. Force

Explanation: Time is considered a fundamental quantity in the SI system. It is one of the seven base units and is measured in seconds (s). Time is independent and serves as a fundamental parameter in describing physical phenomena.

129. Which of the following is a derived quantity:

• A. Mass
• B. Length
• C. Time
• D. Velocity

Explanation: Velocity is a derived quantity. It is defined as the rate of change of displacement with respect to time. Mathematically, velocity (v) is given by the formula v= Δx/Δt, where Δx is the change in displacement, and Δt is the change in time. Velocity is derived from base quantities like length and time.

130. The unit of power is:

• A. Kilowatt-hour
• B. Joule
• C. Dyne
• D. Kilowatt

Explanation: The kilowatt (kW) is a unit of power and is a correct answer. One kilowatt is equal to 1,000 watts. It is commonly used to measure the power output of electrical devices, and it is a derived unit from the watt.