Overhead telephone wires are made of_____________?

Related Mcqs:

1. Thermocouples are mainly used for the measurement of_____________?

   A. temperature
   B. resistance
   C. eddy currents
   D. coupling co-efficient

2. The minority carrier concentration is largely a function of_____________?

   A. forward biasing voltage
   B. reverse biasing voltage
   C. temperature
   D. the amount of doping

3. Commonly used conducting materials are_____________?

   A. copper
   B. aluminium
   C. both (A) and (B)
   D. copper and silver
   E. platinum and gold

4. highest conductivity_____________?

   B. lowest temperature co-efficient
   C. good mechanical strength
   D. good corrosion resistance
   E. easy solderable and drawable quality
   F. all of the above

5. An H.R.C. fuse is_______________?

   A. a ceramic body having metal and caps
   B. a wire of platinum
   C. a heavy cross-section of copper or aluminium
   D. a ceramic tube having carbon rod inside it

6. Which of the following variety of copper has the best conductivity ?

   A. Induction hardened copper
   B. Hard drawn copper
   C. Pure annealed copper
   D. Copper containing traces of silicon

7. Total number of crystal systems is____________?

   A. 2
   B. 4
   C. 7
   D. 12

8. In a crystal, an atom vibrates at a frequency determined by_______________?

   A. the heat content of the crystal
   B. the temperature of the crystal
   C. the stiffness of the bonds it makes with neighbors

9. Which of the following materials is used for making coils of standard resistances ?

   A. Copper
   B. Nichrome
   C. Platinum
   D. Manganin

10. The photo-electric effect occurs only when the incident light has more than a certain critical____________?

    A. intensity
    B. speed
    C. frequency
    D. wave length