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.Management Sciences
Category: Current Electricity
Specific resistance of a wire____________________?
A. will depend on its length
B. will depend on its radius
C. will depend on the type of material of the wire
D. will depend on none of the above
A wire having very high value of conductance is said to be____________________?
A. very good conductor
B. moderately good conductor
C. an insulator
D. no specific criterion available
When same current passes for same time through a thick and thin wire_________________?
A. more heat is produced in thick wire
B. more heat is produced in thin wire
C. no heat is produced in wire
D. less heat is produced in thick wire
Why should a resistance be introduced in a circuit in series deliberately ?
A. to increase current
B. to decrease current
C. to control current
D. just to give a good look to circuit
Which one of the following materials is useful for making bulb filaments ?
A. constantan
B. nichrome
C. copper
D. tungsten
Circuit which gives continuously varying potential is called _______________________?
A. complex network
B. wheat stone bridge
C. potential divider
D. all of above
The resistance of a conductor at absolute zero (OK) is________________?
A. zero almost
B. infinite almost
C. no prediction at all
D. may increase or decrease
Which one is the best material for making connecting wires ?
A. iron
B. tungsten
C. silver
D. copper
Thermocouples convert___________________?
A. heat energy into electrical energy
B. heat energy into light energy
C. heat energy into mechanical energy
D. mechanical energy into heat energy
A fuse is placed in series with the circuit to protect against__________________?
A. high power
B. high voltage
C. high current
D. over heating
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