Selenium is __________ semiconductor?

A. extrnisic
B. intmisic
C. N-type
D. P-type

Which of the following material is not a semiconductor ?
A. Silica B. Germanium C. Selenium D. Gallium-arsenide...
Which of the following is a semiconductor material ?
A. Phosphorous B. Rubber C. Silicon D. Aluminium...
The conductivity of an extrinsic semiconductor with temperature________________?
A. decreases B. increases C. remains constant...
The formula __________ determines the number of electrons that can be accommodated in any level?
A. 2n2 B. 4n2 C. 2n3 D. 4ns...
__________ is the main constituent of glass?
A. Fe203 B. Si02 C. AI2O3 D. B2O3...
__________ is a hard solder?
A. Tin-lead B. Tin-silver-lead C. Copper-zinc D. None of the above...
Commonly used conducting materials are_____________?
A. copper B. aluminium C. both (A) and (B) D. copper and silver E. platinum and gold...
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...
The conductivity of a metal is determined by____________?
A. the electronic concentration and the mobility of the free electrons B. the number of valence electrons per atom C. either (A) or (B) D. none of the above...
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)...