Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be_________________?

Related Mcqs:

1. 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

2. Three 6 ohm resistors are connected to form a triangle. What is the resistance between any two corners ___________?

   A. 3/2 Q
   B. 6 Q
   C. 4 Q
   D. 8/3 Q

3. 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.

4. The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ?

   A. 18 Q
   B. 36 Q
   C. 48 Q
   D. 64 Q

5. 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

6. Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes__________?

   A. 1/9 times
   B. 3 times
   C. 9 times
   D. unchanged

7.  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

8. 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

9. 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

10. 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