Subject :NSO Class : Class 6
In the given figure, which of the following switches need to be closed to change electrical energy to sound energy only?
AP, Q and R
BP, R and T
CP, Q, R and T
DP, Q, S and T
Ans 1:
Class : Class 6
B
Ans 2:
Class : Class 6
P,R,T. By closing these switches and none of the other open ones, one wire is connected to the filament no 1 of the bulb but 2 to the doorbell. This gives only sound energy.