SI Units — Set 4

Correct Answer: A. Volt per meter

The volt per meter is the SI unit for electric field strength. It represents the change in electric potential over a specific distance. It can also be expressed in newtons per coulomb.

Correct Answer: D. Farad per meter

Farad per meter is the SI unit for permittivity. It measures how much an electric field is affected by a dielectric medium. The permittivity of free space is a fundamental physical constant.

Correct Answer: B. Henry per meter

Henry per meter is the SI unit used to measure magnetic permeability. it indicates the ability of a material to support the formation of a magnetic field. Vacuum permeability is exactly 4π × 10⁻⁷ H/m.

Correct Answer: D. Watt per square meter

Watt per square meter is the SI unit for irradiance or radiant flux density. It measures the power received by a surface per unit area. This unit is commonly used in solar energy studies.

Correct Answer: A. Cubic meter per mole

Cubic meter per mole is the SI unit for molar volume. It represents the volume occupied by one mole of a substance. For an ideal gas at STP, this value is approximately 0.0224 cubic meters.

Correct Answer: B. Radian per second

Radian per second is the SI unit for angular velocity. It describes the rate of change of the angular position of an object. It is a vector quantity in rotational mechanics.

Correct Answer: C. Radian per second squared

Radian per second squared is the SI unit for angular acceleration. It measures the rate at which angular velocity changes over time. This is the rotational analogue of linear acceleration.

Correct Answer: D. Meter

The meter is the base unit of length in the International System of Units. It is defined by taking the fixed numerical value of the speed of light in vacuum. It was originally intended to be one ten-millionth of the distance from the equator to the North Pole.

Correct Answer: C. Kilogram

The kilogram is the SI base unit of mass. It is now defined in terms of the Planck constant rather than a physical prototype. It is the only base unit with a SI prefix in its name.

Correct Answer: D. Second

The second is the base unit of time in the SI system. It is defined based on the transition frequency of the cesium-133 atom. Most other SI units depend on the definition of the second.