1. The voltage applied across an electric iron is halved. The power consumption of the iron will be:
- one-half
- three-fourth
- one-fourth
- 1/√2times
2. Resistance of 200w,250v lamp will be
- 625 Ω
- 1250Ω
- 312.5Ω
- 31.25Ω
3. Two heaters rated at 1000w, 250v each are connected in series across a 250v, 50Hz ac supply. The total power drawn from the supply will be:
- 1000w
- 500w
- 250w
- 2000w
4. A 200w, 100v lamp is to be operated on 250v supply. The additional resistance required to be connected in series will be:
- 125Ω
- 50Ω
- 75Ω
- 25Ω
5. Kirchoff’s laws are valid for
- linear circuits only
- passive time invariant circuits
- non-linear circuits only
- both linear and non-linear circuits
6. KCL is applicable only to
- electric circuits
- electronic circuits
- junctions in a network
- closed loop in a network
7. KVL is concerned with
- IR drop
- battery emf
- junction node
- both a and b
8. A wye arrangement of resistances has each resistance of 3Ω, the equivalent delta arrangement will have each resistance of values.
- 9Ω
- 6Ω
- 3Ω
- 1Ω
9. If Q.8 resistor are connected in delta arrangement then the equivalent wye will be 1Ω.
10. A battery is connected to a resistance causing a current of 0.5A in the circuit. The current drops to 0.4 when an additional resistance of 5Ω is connected in series . The current will drop to 0.2A when the resistance is further increased by
- 10Ω
- 15Ω
- 25Ω
- 40Ω