Semiconductor
Super-conductor
Compound
Insulator
Answer is Right!
Answer is Wrong!
Detailed SolutionA substance whose molecules consist of dissimilar atoms is called
Current electricity
72. Are the materials having electrical conductivity much less than most of the metals but much greater than that of typical insulators.
Varistors
Thermistor
Semiconductors
Variable resistors
Answer is Right!
Answer is Wrong!
73. Temperature coefficient of resistance is expressed in terms of
ohms/°C
mhos/ohm°C
ohms/ohm°C
mhos/°C
Answer is Right!
Answer is Wrong!
Detailed SolutionTemperature coefficient of resistance is expressed in terms of
74. Which of the following statement is true?
A galvanometer with low resistance in parallel is a voltmeter
A galvanometer with high resistance in parallel is a voltmeter
A galvanometer with low resistance in series is an ammeter
A galvanometer with high resistance in series is an ammeter
Answer is Right!
Answer is Wrong!
75. A 3 ohm resistor having 2 A current will dissipate the power of
2 watts
4 watts
6 watts
8 watts
Answer is Right!
Answer is Wrong!
Detailed SolutionA 3 ohm resistor having 2 A current will dissipate the power of
76. Heat in a conductor is produced on the passage of electric current due to
reactance
capacitance
impedance
resistance
Answer is Right!
Answer is Wrong!
Detailed SolutionHeat in a conductor is produced on the passage of electric current due to
77. Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
9 times
$$ rac{1}{9}$$ times
$$ rac{1}{3}$$ times
3 times
Answer is Right!
Answer is Wrong!
78. The S.I. unit of power is
Henry
Coulomb
Watt
Watt-hour
Answer is Right!
Answer is Wrong!
79. All good conductors have high
Conductance
Resistance
Reluctance
Thermal conductivity
Answer is Right!
Answer is Wrong!
80. Which of the following statement is correct?
A semiconductor is a material whose conductivity is same as between that of a conductor and an insulator
A semiconductor is a material which has conductivity having average value of conductivity of metal and insulator
A semiconductor is one which conducts only half of the applied voltage
A semiconductor is a material made of alternate layers of conducting material and insulator
Answer is Right!
Answer is Wrong!
Detailed SolutionWhich of the following statement is correct?