Explanation

The coulomb, also written as its abbreviation 'C', is the SI unit for electric charge.

One coulomb is equal to the amount of charge from a current of one ampere flowing for one second.

One coulomb is equal to the charge on 6.241 x 1018 protons.

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Explanation

Deca (symbol: da) is the SI prefix that represents a factor of 10.

It is used to denote ten times the base unit, such as 1 decameter = 10 meters.

Explanation

 joule is a scalar quantity.

SI base units: kg⋅m2⋅s−2

Symbol: J

joule, a unit of work or energy in the International System of Units (SI)

Explanation

Power of a Lens= 1/focal length

Explanation

Permittivity (ε) quantifies how much the electric field is reduced within a medium.  

Its SI unit is Farad per meter (F/m).

Explanation

Angular momentum (L) = Moment of inertia (I) × Angular velocity (ω)  

- Moment of inertia unit = kg·m²  

- Angular velocity unit = rad/s (radian is dimensionless)  

→ So, unit of angular momentum = kg·m²/s

Explanation

The kilowatt-hour (kWh) is a unit of energy commonly used to measure electricity consumption.

It represents the amount of energy used when a device with a power rating of 1 kilowatt operates for 1 hour. 

Additional information 

Energy/Work: Measured in joules (J).

Charge: Measured in coulombs (C).

Pressure: Measured in pascals (Pa).

Electric current: Measured in amperes (A).

Electric resistance: Measured in ohms (Ω).

Temperature: Measured in kelvin (K).

Torque: Measured in newton metres (N m).

Velocity: Measured in meters per second (m/s).

Acceleration: Measured in meters per second squared (m/s²).

Explanation

Lactometer is used for milk

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A lactometer is an instrument that is used to check for the purity of milk by measuring its density.

 lactometer works on the principle of gravity of milk.

Explanation

Cubic is a measure of flow rate.

Cusec is the short form for cubic meter per seconds/cubic feet per seconds.

Cusec is generally used to measure the flow rate.

1 Cusec is equal to 28.317 litres.

Explanation

Calorie is a unit of energy, not temperature.

The correct SI unit for temperature is Kelvin.