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.Management Sciences
Category: Current Electricity
Production of heat due to an electric current flowing through a conductor is given by _________________?
A. Joule effect
B. Joule Thomsons effect
C. Comptons effect
D. Feed back effect
Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains ?
A. 40 W bulb
B. 60 W blub
C. 100 W blub
D. all will burn equally brightly
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
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