# Units of Measurement Multiple-Choice Questions and Answers

In this article, you will find the top 50 units of measurement Multiple-choice questions and answers with detailed explanations.

## What is the standard unit of length in the International System of Units?

A. Meter

B. Foot

C. Yard

D. Inch

**Correct Answer:** A. Meter

**Explanation:** The meter is the standard unit of length in the SI, and is defined as the distance light travels in a vacuum during a time interval of 1/299,792,458 of a second.

## What is the formula for converting feet to meters?

A. 1 foot = 0.3048 meters

B. 1 foot = 3.2808 meters

C. 1 foot = 1.0936 meters

D. 1 foot = 2.54 meters

**Correct Answer: **A. 1 foot = 0.3048 meters

**Explanation:** To convert from feet to meters, you multiply the number of feet by 0.3048, as 1 foot is equal to 0.3048 meters.

## What is the unit of measurement for weight or mass in the SI system?

A. Kilogram

B. Gram

C. Pound

D. Ounce

**Correct Answer: **A. Kilogram

**Explanation:** The kilogram (kg) is the unit of measurement for weight or mass in the SI system. It is defined as the mass of the International Prototype of the Kilogram, a platinum-iridium cylinder kept at the International Bureau of Weights and Measures in France.

## What is the basic unit of mass in the SI?

A) Gram

B) Kilogram

C) Ton

D) Pound

**Correct Answer:** B) Kilogram

**Explanation:** The kilogram is the basic unit of mass in the SI and is defined as the mass of the International Prototype of the Kilogram, a cylinder of platinum-iridium alloy kept at the International Bureau of Weights and Measures.

## What is the formula for converting gallons to liters?

A. 1 gallon = 3.785 liters

B. 1 gallon = 4.546 liters

C. 1 gallon = 0.2642 liters

D. 1 gallon = 1 liter

**Correct Answer:** A. 1 gallon = 3.785 liters

**Explanation:** To convert gallons to liters, you multiply the number of gallons by 3.785, as 1 gallon is equivalent to 3.785 liters.

## What is the unit of measurement for temperature in the SI system?

A. Fahrenheit

B. Celsius

C. Kelvin

D. Rankine

**Correct Answer:** C. Kelvin

**Explanation:** The kelvin (K) is the unit of measurement for temperature in the SI system. It is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water, and is the base unit of temperature in the International System of Units (SI).

## What is the formula for converting miles to kilometers?

A. 1 mile = 1.609 kilometers

B. 1 mile = 0.869 kilometers

C. 1 mile = 2.54 kilometers

D. 1 mile = 3.2808 kilometers

**Correct Answer:** A. 1 mile = 1.609 kilometers

**Explanation:** To convert miles to kilometers, you multiply the number of miles by 1.609, as 1 mile is equivalent to 1.609 kilometers.

## What is the unit of measurement for the time in the SI system?

A. Minute

B. Hour

C. Day

D. Second

**Correct Answer:** D. Second

**Explanation:** The second (s) is the unit of measurement for a time in the SI system. The duration of 9,192,631,770 periods of radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom is defined as one second.

## What is the formula for converting pounds to kilograms?

A. 1 pound = 0.45359237 kilograms

B. 1 pound = 0.04359237 kilograms

C. 1 pound = 0.035359237 kilograms

D. 1 pound = 0.55359237 kilograms

**Correct Answer:** A. 1 pound = 0.45359237 kilograms

**Explanation:** To convert pounds to kilograms, you multiply the number of pounds by 0.45359237, as 1 pound is equivalent to 0.45359237 kilograms.

## What is the unit of measurement for electric current in the SI system?

A. Ampere

B. Volt

C. Watt

D. Ohm

**Correct Answer:** A. Ampere

**Explanation:** The ampere (A) is the unit of measurement for electric current in the SI system. It is defined as that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 x 10^{-7} newton per meter of length.

## What is the formula for converting degrees Fahrenheit to degrees Celsius?

A. (°F – 32) x 5/9 = °C

B. (°F – 32) x 9/5 = °C

C. (°F + 32) x 5/9 = °C

D. (°F + 32) x 9/5 = °C

**Correct Answer:** B. (°F – 32) x 9/5 = °C

**Explanation:** To convert degrees Fahrenheit to degrees Celsius, you subtract 32 from the temperature in Fahrenheit, then multiply the result by 9/5. This is because the size of the degree Fahrenheit and degree Celsius are different.

## What is the formula for calculating the area of a circle?

A. A = πr^{2}

B. A = 2πr

C. A = r^{2}

D. A = 4πr

**Correct Answer: **A. A = πr^{2}

**Explanation:** The formula for calculating the area of a circle is A = πr^{2}, where A is the area and r is the radius of the circle.

## What is the unit of measurement for luminous intensity in the SI system?

A. Candela

B. Lux

C. Lumen

D. Watt

**Correct Answer:** A. Candela

**Explanation: **The cand (cd) is the unit of measurement for luminous intensity in the SI system. It is defined as the luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10^{12} hertz and that has a radiant intensity in that direction of 1/683 watt per steradian.

## What is the formula for calculating the volume of a sphere?

A. V = 4/3πr^{3}

B. V = 4πr^{2}

C. V = 3πr^{2}

D. V = 2πr^{3}

**Correct Answer: **A. V = 4/3πr^{3}

**Explanation: **The formula for calculating the volume of a sphere is V = 4/3πr^{3}, where V is the volume, and r is the radius of the sphere.

## What is the unit of measurement for force in the SI system?

A. Newton

B. Joule

C. Watt

D. Coulomb

**Correct Answer:** A. Newton

**Explanation:** The Newton (N) is the unit of measurement for force in the SI system. It is defined as the force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

## What is the formula for calculating the perimeter of a rectangle?

A. P = 2(l + w)

B. P = 2l + 2w

C. P = 2lw

D. P = l + w

**Correct Answer:** B. P = 2l + 2w

**Explanation:** The formula for calculating the perimeter of a rectangle is P = 2l + 2w, where P is the perimeter, l is the length and w is the width of the rectangle.

## What is the formula for calculating the volume of a cylinder?

A. V = πr^{2h }

B. V = πr^{2}

C. V = 2πr^{2}

D. V = 2πr^{2h}

**Correct Answer:** A. V = πr^{2h}

**Explanation: **The formula for calculating the volume of a cylinder is V = πr^{2h}, where V is the volume, r is the radius of the cylinder and h is the height of the cylinder.

## What is the unit of measurement for pressure in the SI system?

A. Newton

B. Joule

C. Pascal

D. Coulomb

**Correct Answer:** C. Pascal

**Explanation:** The Pascal (Pa) is the unit of measurement for pressure in the SI system. It is defined as one newton per square meter.

## What is the formula for calculating the area of a triangle?

A. A = 1/2bh

B. A = bh

C. A = 1/2(b+h)

D. A = (b+h)/2

**Correct Answer:** A. A = 1/2bh

**Explanation:** The formula for calculating the area of a triangle is A = 1/2bh, where A is the area, b is the base and h is the height of the triangle.

## What is the unit of measurement for energy in the SI system?

A. Joule

B. Newton

C. Pascal

D. Coulomb

**Correct Answer:** A. Joule

**Explanation: **The Joule (J) is the unit of measurement for energy in the SI system. It is defined as the work done when a force of one newton is applied over a distance of one meter.

## What is the formula for calculating the volume of a rectangular prism?

A. V = lwh

B. V = (l+w+h)

C. V = 2lwh

D. V = (lw+h)

**Correct Answer: **A. V = lwh

**Explanation:** The formula for calculating the volume of a rectangular prism is V = lwh, where V is the volume, l is the length, w is the width and h is the height of the rectangular prism.

## What is the formula for calculating the density of an object?

A. D = m/V

B. D = V/m

C. D = m*V *

D. D = Vm

**Correct Answer:** A. D = m/V

**Explanation:** The formula for calculating the density of an object is D = m/V, where D is the density, m is the mass of the object and V is the volume of the object.

## What is the unit of measurement for capacitance in the SI system?

A. Farad

B. Coulomb

C. Ampere

D. Volt

**Correct Answer:** A. Farad

**Explanation: **The Farad (F) is the unit of measurement for capacitance in the SI system. It is defined as the ratio of the electric charge on each conductor to the potential difference between them.

## What is the formula for calculating the speed of an object?

A. Speed = d/t

B. Speed = t/d

C. Speed = dt

D. Speed = td

**Correct Answer:** A. Speed = d/t

**Explanation:** The formula for calculating the speed of an object is Speed = d/t, where Speed is the speed, d is the distance traveled by the object and t is the time taken by the object to travel that distance.

## What is the unit of measurement for power in the SI system?

A. Joule

B. Newton

C. Watt

D. Coulomb

**Correct Answer: **C. Watt

**Explanation:** The watt (W) is the unit of measurement for power in the SI system. It is defined as one joule per second.

## What is the formula for calculating the acceleration of an object?

A. Acceleration = v/t

B. Acceleration = t/v

C. Acceleration = v-u/t

D. Acceleration = u-v/t

**Correct Answer:** C. Acceleration = v-u/t

**Explanation:** The formula for calculating the acceleration of an object is Acceleration = (v-u)/t, where Acceleration is the acceleration, v is the final velocity, u is the initial velocity and t is the time taken.

## What is the formula for calculating the wavelength of a wave?

A. Wavelength = Speed / Frequency

B. Wavelength = Frequency / Speed

C. Wavelength = Speed * Frequency

D. Wavelength = Frequency * Speed

**Correct Answer:** A. Wavelength = Speed / Frequency

**Explanation:** The formula for calculating the wavelength of a wave is Wavelength = Speed / Frequency, where Wavelength is the wavelength, Speed is the speed of the wave and Frequency is the number of oscillations of the wave per second.

## What is the unit of measurement for inductance in the SI system?

A. Henry

B. Weber

C. Tesla

D. Coulomb

**Correct Answer:** A. Henry

**Explanation: **The henry (H) is the unit of measurement for inductance in the SI system. It is defined as the inductance of a circuit in which an electromotive force of one volt is induced when the current through the circuit changes at a rate of one ampere per second.

## What is the formula for calculating the period of a wave?

A. Period = 1 / Frequency

B. Period = Frequency / 1

C. Period = Frequency * 1

D. Period = 1 * Frequency

**Correct Answer:** A. Period = 1 / Frequency

**Explanation: **The formula for calculating the period of a wave is Period = 1 / Frequency, where Period is the time taken for one oscillation of the wave and Frequency is the number of oscillations of the wave per second.

## What is the unit of measurement for resistivity in the SI system?

A. Ohm

B. Ampere

C. Volt

D. Siemens

**Correct Answer: **A. Ohm

**Explanation:** The ohm (Ω) is the unit of measurement for resistivity in the SI system. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the source of any electromotive force.

## What is the formula for calculating the angular velocity of an object?

A. Angular velocity = 2π / T

B. Angular velocity = T / 2π

C. Angular velocity = π / T

D. Angular velocity = T / π

**Correct Answer:** A. Angular velocity = 2π / T

**Explanation: **The formula for calculating the angular velocity of an object is Angular velocity = 2π / T, where Angular velocity is the angular velocity, and T is the time taken for one complete revolution.

## What is the formula for calculating the period of a simple pendulum?

A. T = 2π √(L/g)

B. T = 2π √(g/L)

C. T = √(2πL/g)

D. T = √(2πg/L)

**Correct Answer:** A. T = 2π √(L/g)

**Explanation: **The formula for calculating the period of a simple pendulum is T = 2π √(L/g), where T is the period, L is the length of the pendulum and g is the acceleration due to gravity.

## What is the unit of measurement for the electric potential difference in the SI system?

A. Volt

B. Ampere

C. Ohm

D. Coulomb

**Correct Answer:** A. Volt

**Explanation:** The volt (V) is the unit of measurement for the electric potential difference in the SI system. It is defined as the difference of electric potential between two points of a conducting wire carrying a constant current of one ampere when the power dissipated between these points is equal to one watt.

## What is the formula for calculating the acceleration due to gravity?

A. g = 9.8 m/s^{2}

B. g = 9.8 ft/s^^{2}

C. g = 9.8 km/s^{2}

D. g = 9.8 cm/s^{2}

**Correct Answer:** A. g = 9.8 m/s^{2}

**Explanation:** The acceleration due to gravity on the surface of the Earth is approximately 9.8 m/s^{2}. This value can vary slightly depending on location and altitude.

## What is the unit of measurement for electric charge in the SI system?

A. Coulomb

B. Ampere

C. Volt

D. Ohm

**Correct Answer:** A. Coulomb

**Explanation:** The Coulomb (C) is the unit of measurement for electric charge in the SI system. It is defined as the quantity of electricity transported in one second by a current of one ampere.

## What is the formula for calculating the work done by a force?

A. W = Fd

B. W = dF

C. W = F/d

D. W = d/F

**Correct Answer: **A. W = Fd

**Explanation:** The formula for calculating the work done by a force is W = Fd, where W is the work done, F is the force applied and d is the distance over which the force is applied.

## What is the formula for calculating the gravitational potential energy of an object?

A. U = mgh

B. U = m*g*h

C. U = g*m*h

D. U = h*m*g

**Correct Answer:** A. U = mgh

**Explanation:** The formula for calculating the gravitational potential energy of an object is U = mgh, where U is the potential energy, m is the mass of the object, g is the acceleration due to gravity and h is the height of the object.

## What is the unit of measurement for magnetic flux in the SI system?

A. Weber

B. Tesla

C. Henry

D. Coulomb

**Correct Answer:** A. Weber

**Explanation: **The Weber (Wb) is the unit of measurement for magnetic flux in the SI system. It is defined as the flux that, linking a circuit of one turn, would produce in it an electromotive force of one volt if it were reduced to zero at a uniform rate in one second.

## What is the formula for calculating the kinetic energy of an object?

A. K = 1/2mv^{2}

B. K = 2mv^{2}

C. K = mv^{2}

D. K = 1/2*m*v^{2}

**Correct Answer: **A. K = 1/2mv^{2}

**Explanation: **The formula for calculating the kinetic energy of an object is K = 1/2mv^{2}, where K is the kinetic energy, m is the mass of the object, and v is the velocity of the object.

## What is the unit of measurement for electric resistance in the SI system?

A. Ohm

B. Ampere

C. Volt

D. Coulomb

**Correct Answer: **A. Ohm

**Explanation:** The ohm (Ω) is the unit of measurement for electric resistance in the SI system. It is defined as the resistance between two points of a conductor when a constant potential difference of one volt, applied to these points, produces in the conductor a current of one ampere, the conductor not being the source of any electromotive force.

## What is the formula for calculating the spring constant of a spring?

A. k = F/x

B. k = x/F

C. k = Fx

D. k = xF

**Correct Answer:** A. k = F/x

**Explanation:** The formula for calculating the spring constant of a spring is k = F/x, where k is the spring constant, F is the force applied and x is the displacement

## What is the formula for calculating the moment of inertia of an object?

A. I = mr^{2}

B. I = mr

C. I = r^{2}/m

D. I = r/m

**Correct Answer: **A. I = mr^{2}

**Explanation: **The formula for calculating the moment of inertia of an object is I = mr^{2}, where I is the moment of inertia, m is the mass of the object and r is the radius of gyration of the object.

## What is the unit of measurement for magnetic field strength in the SI system?

A. Weber

B. Tesla

C. Henry

D. Coulomb

**Correct Answer:** B. Tesla

**Explanation:** The Tesla (T) is the unit of measurement for magnetic field strength in the SI system. It is defined as the magnetic flux density in a vacuum.

## What is the formula for calculating the frequency of a wave?

A. Frequency = Speed / Wavelength

B. Frequency = Wavelength / Speed

C. Frequency = Speed * Wavelength

D. Frequency = Wavelength * Speed

**Correct Answer:** A. Frequency = Speed / Wavelength

**Explanation:** The formula for calculating the frequency of a wave is Frequency = Speed / Wavelength, where Frequency is the number of oscillations of the wave per second, Speed is the speed of the wave and Wavelength is the distance between two consecutive points of the wave that are in phase.

## What is the formula for calculating the angular momentum of an object?

A. L = mvr

B. L = mrv

C. L = rmv

D. L = rvm

**Correct Answer:** A. L = mvr

**Explanation:** The formula for calculating the angular momentum of an object is L = mvr, where L is the angular momentum, m is the mass of the object, v is the linear velocity and r is the distance of the object

## What is the formula for calculating the current in an electric circuit?

A. I = V / R

B. I = R / V

C. I = V * R

D. I = R * V

**Correct Answer:** A. I = V / R

**Explanation: **The formula for calculating the current in an electric circuit is I = V / R, where I is the current, V is the voltage and R is the resistance in the circuit.

## What is the unit of measurement for electric conductance in the SI system?

A. Siemens

B. Ampere

C. Volt

D. Ohm

**Correct Answer:** A. Siemens

**Explanation:** The siemens (S) is the unit of measurement for electric conductance in the SI system. It is defined as the conductance of a circuit in which a current of one ampere is produced by a potential difference of one volt.

## What is the formula for calculating the power in an electric circuit?

A. P = V * I

B. P = I * R

C. P = V / I

D. P = I / V

**Correct Answer:** A. P = V * I

**Explanation:** The formula for calculating the power in an electric circuit is P = V * I, where P is the power, V is the voltage and I is the current in the circuit.

## What is the unit of measurement for electric field strength in the SI system?

A. Newton/Coulomb

B. Coulomb/Newton

C. Coulomb/Volt

D. Volt/Coulomb

**Correct Answer:** A. Newton/Coulomb

**Explanation:** The unit of measurement for electric field strength in the SI system is Newton/Coulomb (N/C). It is defined as the force acting on a unit positive charge placed in an electric field.

## What is the formula for calculating the torque of a force?

A. T = rF

B. T = Fr

C. T = r/F

D. T = F/r

**Correct Answer:** A. T = rF

**Explanation: **The formula for calculating the torque of a force is T = rF, where T is the torque, r is the distance from the axis of rotation and F is the force applied.

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