71) The human eye functions on the principle of sensation of

A) vison
B) hearing
C) taste
D) smell

72) An amount of charge passing through any cross-section of the conductor in 1 second is called

A) electric potential
B) electric current
C) electric resistance
D) electromotive force

73) Which of the following materials obeys the ohm’s law

A) light emitting diode
B) silicon
C) aluminium
D) germanium

74) Pick the false statement on the metallic conductors

A) they obey the ohm’s law
B) the ratio of voltage and current is constant
C) the voltage-current graph is non-linear
D) their resistance changes with temperature

75) The device used to measure the potential difference or electromotive force is

A) ammeter
B) voltmeter
C) calorimeter
D) barometer