Carbon rods are used in wet and dry cells because_____________?

Related Mcqs:

1. The resistivity of a metal is a function of temperature because_____________?

   A. the amplitude of vibration of the atoms varies with temperature B. the electron density varies with temperature C. the electron gas density varies with temperature...

2. Copper, even though costly, finds use in the windings of electrical machines because_____________?

   A. copper points offer low contact resistance B. copper can be easily soldered and welded E. copper windings are less bulky and the machines become compact D. all of the above...

3. Carbon electrodes are not used in_______________?

   A. GLS lamps B. electric arc furnace C. dry cells D. cinema projectors...

4. A carbon resistor contains_____________?

   A. carbon crystals B. solid carbon granules C. pulverized coal D. finely divided carbon black...

5. Carbon resistors are used extensively because they are____________?

   A. easy to make B. compact C. inexpensive D. all of the above reasons...

6. Carbon bearings are used under which of the following conditions ?

   A. Where lubrication is difficult or im-possible B. Where corrosive chemical action exists C. Where high temperature exists D. All of the above...

7. The carbon percentage is least in__________________?

   A. low carbon steel B. wrought iron C. cast iron D. malleable iron...

8. The conductivity of a conductor can be increased by_______________?

   A. decreasing its temperature B. increasing its temperature C. decreasing its vibration D. increasing its vibration...

9. Piezoelectric materials serve as a source of ____________ ?

   A. resonant waves B. musical waves C. microwaves D. ultrasonic waves...

10. Low resistivity materials are used in__________?

    A. transformer, motor and generator windings B. transmission and distribution lines C. house wiring D. all above applications...