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
In the following figure, the terminal potential is:
A. zero
B. 2V
C. 12V
D. 36V
There are three bulbs of 60W 100W and 200W which bulb has thickest filament:
A. 100W
B. 200W
C. 60W
D. al
Circuit which gives continuously varying potential is called:
A. complex network
B. wheat stone bridge
C. potential divider
D. all of above
An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be:
A. 12
B. 24
C. 5
D. 1100
In liquids and gases the current is due to the motion:
A. negative charges
B. positive charges
C. both negative and positive charges
D. neutral particles
Internal resistance is the resistance offered by:
A. source of EMF
B. conductor
C. resistor
D. capacitor
Which one is the best material for making connecting wires:
A. iron
B. tungsten
C. silver
D. copper
Resistance of a super conductor is:
A. finite
B. infinite
C. zero
D. changes w
