Practice Test: Question Set - 04
1. Which of the following resistive materials has the lowest temperature coefficient of resistance?
- (A) Nichrome
- (B) Constantan
- (C) Kanthal
- (D) Molybdenum
2. Piezoelectric materials serve as a source of ________.
- (A) Resonant waves
- (B) Musical waves
- (C) Microwaves
- (D) Ultrasonic waves
3. Thermionic emission occurs in
- (A) Vacuum tubes
- (B) Copper conductors
- (C) Ferrite cores
- (D) Transistors
4. 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
5. Which of the following high resistance materials has the highest operating temperature?
- (A) Kanthal
- (B) Manganin
- (C) Nichrome
- (D) Eureka
6. Which of the following materials is the best conductor of electricity?
- (A) Tungsten
- (B) Aluminium
- (C) Copper
- (D) Carbon
7. The forbidden gap in an insulator is
- (A) Large
- (B) Small
- (C) Nil
- (D) Any of the above
8. The current due to electron flow in conduction band is the hole current in valence band.
- (A) Equal to
- (B) Less than
- (C) Greater than
- (D) Any of the above
9. The converse of hardness is known as
- (A) Malleability
- (B) Toughness
- (C) Softness
- (D) None of the above
10. The superconductivity is due to
- (A) The crystal structure having no atomic vibration at
0°K
- (B) All electrons interact in the
superconducting state
- (C) The electrons jump into nucleus at 0°K
- (D) None of the above