Surface resistance of an insulating material is reduced due to the______________?

Related Mcqs:

1. Effect of moisture on the insulating materials is to________________?

   A. decrease dielectric constant B. decrease dielectric strength C. decrease insulation resistance D. increase dielectric loss E. all of the above...

2. For a particular material the Hall coefficient was found to be zero. The material is______________?

   A. insulator B. metal C. intrinsic semiconductor D. none of the above...

3. The metal having the lowest temperature coefficient of resistance is_________________?

   A. gold B. copper C. aluminium D. kanthal...

4. Which of the following resistive materials has the lowest temperature co-efficient of resistance ?

   A. Nichrome B. Constantan C. Kanthal D. Molybdenum...

5. Which of the following high resistance materials has the highest operating temperature ?

   A. Kanthal B. Manganin C. Nichrome D. Eureka...

6. Substances whose specific resistance abruptly decreases at very low temperature are called___________?

   A. insulators B. conductors C. semiconductors D. superconductors...

7. If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as____________?

   A. non-linear conductor B. reverse conductor C. bad-conductor D. non-conductor...

8. _________ is an example of piezoelectric material?

   A. Glass B. Quartz C. Corrundum D. Neoprene...

9. A good electric contact material should have all of the following properties except_____________?

   A. high resistivity B. high resistance to corrosion C. good thermal conductivity D. high melting point...

10. Which of the following material is not a semiconductor ?

    A. Silica B. Germanium C. Selenium D. Gallium-arsenide...