A. increases
B. decreases
C. remains same
D. none of the above
0
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
0
In the case of direct current____________?
A. 100 W lamp will glow brighter
B. 40 W lamp will glow brighter
C. Both lamps will glow equally bright
D. 40 W lamp will fuse
0
When electric current passes through a bucket full of water, lot of bubbling is observeD. This suggests that the type of supply is____________?
A. magnitude and direction of current remains constant
B. magnitude and direction of current changes with time
C. magnitude of current changes with time
D. magnitude of current remains constant
0
Bulbs in street lighting are all connected in_____________?
A. A. C.
B. D. C.
C. any of above two
D. none of the above
0
For testing appliances, the wattage of test lamp should be_____________?
A. parallel
B. series
C. series-parallel
D. end-to-end
0
Switching of a lamp in house produces noise in the radio. This is because switching operation produces________?
A. very low
B. low
C. high
D. any value
0
74. Sparking occurs when a load is switched off because the circuit has high_________?
A. arcs across separating contacts
B. mechanical noise of high intensity
C. both mechanical noise and arc between contacts
D. none of the above
0
Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?
A. resistance
B. inductance
C. capacitance
D. impedance
2
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
A. 1/9 times
B. 3 times
C. 9 times
D. unchanged
Download App