Download Aptitude Crack
img not found img not found

Voltage and Current - Technical MCQs

Q1:

Which unit of charge contains 6.25 × 1018 electrons?

A An ampere

B A coulomb

C A volt

D A joule

ANS:B - A coulomb

Q = (+/-) ne.

Q = Charge in coulombs.

N = No. of electrons.

E = Charge of electron = 1.6*10^-19.

N = 1/(1.6*10^-19) = 6.25*10^18.

Therefore 1 coulomb of charge contains.

= 6.25*10^18 electrons.