For testing appliances, the wattage of test lamp should be __________?
A. very low
B. low
C. high
D. any value
Author: Aroma Ann
Switching of a lamp in house produces noise in the radio. This is because switching operation produces __________?
A. arcs across separating contacts
B. mechanical noise of high intensity
C. both mechanical noise and arc between contacts
D. none of the above
Bulbs in street lighting are all connected in __________?
A. parallel
B. series
C. series-parallel
D. end-to-end
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct?
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
In the case of direct current __________?
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
In a lamp load when more than one lamp are switched on the total resistance of the load __________?
A. increases
B. decreases
C. remains same
D. none of the above
Resistance of 220 V, 100 W lamp will be __________?
A. 4.84 Q
B. 48.4 Q
C. 484 ft
D. 4840 Q
When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is __________?
A. A. C.
B. D. C.
C. any of above two
D. none of the above
It becomes more difficult to remove __________?
A. any electron from the orbit
B. first electron from the orbit
C. second electron from the orbit
D. third electron from the orbit
When one leg of parallel circuit is opened out, the total current will __________?
A. reduce
B. increase
C. decrease
D. become zero
