If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes______________?

Related Mcqs:

1. The resistance of a conductor of diameter d and length l is R Ω. If the diameter of the conductor is halved and its length is doubled, the resistance will be

   A. R Ω
   B. 2R Ω
   C. 4R Ω
   D. 8R Ω

2. Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be_____________?

   A. 160 ohms
   B. 80 ohms
   C. 20 ohms
   D. 10 ohms

3. 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

4. A nichrome wire used as a heater coil has the resistance of 2 £2/m. For a heater of 1 kW at 200 V, the length of wire required will be_____________?

   A. 80 m
   B. 60 m
   C. 40 m
   D. 20 m

5. The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________?

   A. 1.2 x 10~8 Q-m
   B. 1.4 x 10~8 Q-m
   C. 1.6 x 10″”8 Q-m
   D. 1.8 x 10″8 Q-m

6. The resistance of a few meters of wire conductor in closed electrical circuit is____________?

   A. practically zero
   B. low
   C. high
   D. very high

7. International ohm is defined in terms of the resistance of________________?

   A. a column of mercury
   B. a cube of carbon
   C. a cube of copper
   D. the unit length of wire

8. 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

9. 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

10. 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