Bulbs in street lighting are all connected in_____________?

Related Mcqs:

1. The four bulbs of 40 W each are connected in series swift a battery across them, which of the following statement is true_______________?

   A. The current through each bulb in same
   B. The voltage across each bulb is not same
   C. The power dissipation in each bulb is not same
   D. None of the above

2.  If P is the power of a star connected system then what will be power of an equivalent delta connected system?

   A. P
   B. 3P
   C. P/3
   D. None of the above

   Updated by: muhammad rahim

3. Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________?

   A. 100 Ω
   B. 200 Ω
   C. 300 Ω
   D. 400 Ω

4. Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open_________________?

   A. there will be heavy current in the main line
   B. rest of the two bulbs will not light
   C. all three bulbs will light
   D. the other two bulbs will light

5. Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as________?

   A. 4 : 25
   B. 25 : 4
   C. 2 : 5
   D. 5 : 2

6. Two resistors are said to be connected in series when___________?

   A. same current passes in turn through both
   B. both carry the same value of current
   C. total current equals the sum of branch currents
   D. sum of IR drops equals the applied e.m.f.

7. Two resistances Rl and Ri are connected in series across the voltage source where Rl>Ri. The largest drop will be across______________?

   A. Rl
   B. Ri
   C. either Rl or Ri
   D. none of them

8. A 40 W bulb is connected in series with a room heater. If now 40 W bulb is replaced by 100 W bulb, the heater output will__________

   A. decrease
   B. increase
   C. remain same
   D. heater will burn out

9. 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

10. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals_____________?

    A. 10 W
    B. 20 W
    C. 40 W
    D. 60 W