Current Electricity Multiple Choice Questions

1.             Rate of flow of charge through the surface is known as:                 a)   Charge                                                                            b)   Electric current                         c)   Ampere                                                                           d)   Coulomb

2.             The SI unit of current is:                 a)   Volt                                                                                  b)   Coulomb                         c)   Ampere                                                                           d)   None of these

4.             Free electrons are:                 a)   Loosely bound                                                              b)   Tightly bound                         c)   Fixed                                                                                d)   None of these

5.             In liquids and gases, the current is due to the motion of:                 a)   Positive charges                                                             b)   Negative charges                         c)   Both positive and negative charges                           d)   None of these

6.             Conventional current (I) is due to the motion of:                 a)   Flow of positive charge                                                b)   Flow of negative charge                         c)   Flow of neutron                                                             d)   None of these

7.             The direction of conventional current in a circuit is:                 a)   From negative to positive                                            b)   From positive to negative                         c)   From negative to negative                                           d)   From positive to positive

8.             One advantage of conventional direction of current is that current flows from:                 a)   High potential to low potential                                   b)   Low potential to high potential                         c)   Negative potential to positive potential                    d)   None of these

9.             The average velocity gained by the electrons in a conductor placed in an electric field is called:                 a)   Variable velocity                                                           b)   Phase velocity                         c)   Drift velocity                                                                  d)   Instantaneous velocity

11.          Ampere is a current in which charges flow across any cross-section at the rate of:                 a)   2C/S                                                                                b)   3 CS-1                         c)   CS-1                                                                                  d)   CS-2

12.          Current per unit area is called:                 a)   Current density                                                              b)   Electric charge                         c)   Potential difference                                                      d)   Resistance

13.          The SI unit of current density is:                 a)   m2/A                                                                                b)   A/m2                         c)   m2A                                                                                  d)   mA2

14.          If one ampere current flows through 2m long conductor, the charge flow through this in one hour   will be:                 a)   2 C                                                                                   b)   120 C                         c)   3600 C                                                                            d)   7200 C

15.          The relation V = IR represents:                 a)   Coulomb’s law                                                              b)   Ohm’s law                         c)   Ampere law                                                                    d)   None of these

16.          “In an electrical circuit, the potential difference across a conductor is directly proportional to the    current flowing through it, provided the temperature of the conductor remains the same”. It is known         as:                 a)   Ampere’s law                                                                 b)   Coulomb’s law                         c)   Ohm’s law                                                                      d)   None of these