Question

Electron Volt is a unit of$A.$Potential difference$B.$Energy$C.$Charge$D.$Velocity

Hint: Amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacuum is known as an Electron Volt.

Voltage or Electric potential difference is the difference in electric potential between two points and is defined as the work needed per unit of charge to move a test charge between the two points. SI unit of Potential difference is volt and it is product of Current and Resistance
Energy is the quantitative property that must be transferred to an object in order to perform work or to provide heat energy to the object and it is a conserved quantity. Law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another. The SI unit of energy is Joule, J.
Electric charge is that physical property of matter which causes it to experience a force when placed in an electromagnetic field. Two types of electric charge are positive charge and negative charge. Like charges repel each other and unlike charges attract each other is an important property of charge.

Velocity of an object is the rate of change of its position with respect to a fixed point. It is a function of time. Velocity is similar to speed of an object and has direction of motion. The SI unit is meter/sec.
Now, the electron volt is a unit of energy equal to approximately $1.602 \times {10^{ - 19}}$ Joule. And it is clear from the definition, that it is the amount of energy gained by the charge of a single electron moved across an electric potential difference of one volt.
Hence, the correct option is B which states that Electron volt is a unit of Energy.

So, the correct answer is “Option B”.

Note: For solving such types of questions we must remember the definition of all the given terms then only we are able to make out the correct answer of the question. Also, we must remember the SI unit of each quantity.