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

Related Mcqs:

1. Mercury as an electric contact material is_______________?

   A. a liquid B. a metal C. a metal liquid D. a gas...

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. ___________ has the best damping properties?

   A. Diamond B. High speed steel C. Mild steel D. Cast iron...

4. 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...

5. On which of the following factors does the resistivity of a material depend ?

   A. Resistance of the conductor B. Area of the conductor section C. Length of the conductor D. All of the above...

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

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

7. Which of the following is a semiconductor material ?

   A. Phosphorous B. Rubber C. Silicon D. Aluminium...

8. A highly conductive material must have___________?

   A. 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...

9. _________ is an example of piezoelectric material?

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

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

    A. smoky and dirty atmosphere B. humidity in the atmosphere C. both (A) and (b) D. neither (A) nor (b)...