Answer :

(a)

(b) As the connection is in parallel.

So voltage across both the bulbs is same and is equal to 220V.
Using the Formula P=VI,We can get I as I=P/V Where:-
P= Power
I=Current
V=Voltage/Potential Difference

Current through AB i.e 40W lamp = I1 = P1/V = 40/220 A

Current through CD i.e. 60W lamp = I2 = P2/V = 60/220 A

Total current drawn from the electric supply = 40/220 + 60/220 = 0.45 A
(c)We know that Energy= Power x Time
Total Power to two bulbs together=40W+60W=100W
According to the question both of the bulbs are being operated together at 1 hour
∴ Energy= 100W x 1hr
   Energy= 100Whr
  
We know 1Whr= 3600 Joules
∴100Whr= 3600 X 100
              =360000Joules
              =360kJoules

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