MCQs on Current Electricity

MCQs on Current Electricity

What does the internal resistance of a cell mean?

(a) The resistance of the material used in the cell

(b) The vessel of the cell

(c) The electrodes of the cell

(d) The electrolyte used in the cell

Answer: (d) The electrolyte used in the cell

A potentiometer is considered a versatile and accurate device to make an electrical measurement of EMF. Why?

(a) Because the method involves a combination

(b) There are cells involved

(c) Because of potential gradients

(d) As there is no flow of current through the galvanometer

Answer: (d) As there is no flow of current through the galvanometer

Consider copper and aluminium wire whose length and resistance are the same. Also, the specific resistance of aluminium is more than copper. Select the correct statement

(a) Copper and aluminium mass are the same

(b) Copper wire has more mass than the aluminium wire

(c) Copper wire has less mass than the aluminium wire

(d) The information given is incomplete

Answer: (d) The information given is incomplete

What is the ratio of power dissipated if two electric bulbs are connected in series and the ratio of their resistance is 1:2?

(a) 1:4

(b) 1:2

(c) 2:1

(d) 1: 1

Answer: (b) 1:2

What is the principle behind thermocouple

(a) Joule effect

(b) Thomson effect

(c) Seebeck effect

(d) Peltier effect

Answer: (c) Seebeck effect