11) If R1 and R2 are respectively the filament resistances of 200 W bulb and 100 W bulb designed to operate at the same voltage, then
a) R1 =2 R2
b) R2 = 4 R1
c) R1 =4R2
d) R2 = 2 R1
12) How many calories of heat will approximately be developed in 210 W electric bulb in 5 minute?
a) 15000
b) 1050
c) 63000
d) 8000
13) Two electric lamps of 40 W, each are connected in parallel. The power consumed the combination is
a) 20 W
b) 60 W
c) 80W
d) 100 W
14) A house is served by a 220 V line. In a circuit protected by a fuse market 9 A, the maximum number of 60 W lamps in parallel that can be turned on is
a) 33
b) 44
c) 22
d) 20
15) The current in a 960 W, 240 V heater operated at 200 V is
a) 0.25 A
b) 3/10 A
c) 2.5 A
d) 10/3 A
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