Current Electricity | Electric Current All the best! 1. Electric current has both magnitude and direction. It is a- vector quantity scalar quantity tensor quantity None of these None 2. Conventional current flows from- point of higher potential to lower potential point of lower potential to higher potential point of lower potential to lower potential All of these None 3. The current density (number of free electrons per m^{3}) in metallic conductor is of the order of- (A) 10^{28} (B) 10^{23} (C) 10^{20} (D) 10^{15} Option (A) Option (B) Option (C) Option (D) None 4. A conductor carries a current of 1 A. In one second, the charge that flows through any cross-section of conductor is- 2 coulomb 3 coulomb 1 coulomb 0.5 coulomb None 5. Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remains constant along the conductor is- Current Drift velocity Electric field Current density None 6. The charge flowing through the cross-section of a conductor is given by Q = t^{5} + 2t coulomb. The instantaneous current through the conductor at t = 1 s is- 2 A 5 A 7 A 10 A None 7. The current in a device varies with time t as I = 6t where I is in mA and t is in s. The amount of charge that passes through the device during t=0 s to t=3 s is- 10 mC 18 mC 27 mC 54 mC None 8. If the amount of charge passed in time t through a cross-section of wire is Q = 8t - 2t^{2}, then average current from t=0 to t=2 second is- 0 A 4 A 2 A 8 A None 1 out of 8 Time's up