Physics Practice Test – Current Electricity and Electric Charges

A cell of e.m.f. 1.5 V and internal resistance 1.0 Ω is connected to two resistors of resistances 2.0 Ω  and 3.0 Ω in series. Calculate the current through the resistors.

A. 0.25 A     B. 0.30 A     C. 0.35 A     D. 0.50 A

Charges on a conductor are ________

A. evenly distributed over a surface of any shape
B. concentrated on the inner surface of the conductor
C. concentrated at the outer flat surface of the conductor
D. generally concentrated at sharply curved surface.

A car fuse marked 3 A operates optimally on a 12V battery, calculate the resistance of the fuse

A. 36.0 Ω     B. 15.0 Ω     C. 9.0 Ω     D. 4.0 Ω

A chemical cell of internal resistance 1Ω supplies electric current to an external resistor of resistance 3Ω. Calculate the efficiency of the cell.

Which of the following operations does not represent an action of a force field?

A. Failing of a mango fruit from the tree
B. Picking of nails using a bar magnet
C. Repulsion of two like charges
D. Pushing of a wheel-barrow on a level ground.