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
76) The amount of heat required to raise the temperature of 1 gram of water by 1°C is called
A) joule
B) kelvin
C) calorie
D) degree celsius
77) Two bodies A and B are at temperature -100°C and 173K respectively. The body at higher temperature is
A) A
B) B
C) both are at same temperature
D) none of these
78) Which of the following pairs of substances have the same values of specific heat
A) copper, aluminium
B) ice, water
C) brass, iron
D) ice, kerosene oil
79) When touched, we feel that a metal piece is colder than a wooden piece. This is due to the transfer of heat from our fingers to
A) the metal piece only
B) the wooden piece only
C) both the metal and wooden pieces
D) none of these
80) A samosa appears to be cool outside but it is hot when we eat because the curry inside it has ingredients of
A) lower specific heat
B) higher specific heat
C) zero specific heat
D) none of these
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