The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?

Related Mcqs:

1. 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...

2. A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________?

   A. 400 Q B. 600 Q C. 800 Q D. 1000 Q...

3. The filament of an electric bulb is made of______________?

   A. carbon B. aluminium C. tungsten D. nickel...

4. An electric filament bulb can be worked from____________?

   A. D. C. supply only B. A. C. supply only C. Battery supply only D. All above...

5. 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...

6. 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...

7. Which of the following materials has a negative temperature co-efficient of resistance?

   A. Copper B. Aluminum C. Carbon D. Brass...

8. Temperature co-efficient of resistance is expressed in terms of___________?

   A. ohms/°C B. mhos/ohm°C C. ohms/ohm°C D. mhos/°C...

9. 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...

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

    A. 0.4 ohm B. 0.6 ohm C. 0.8 ohm D. 1.0 ohm...