General Science | Physics | Conductivity
General Science | Physics | Conductivity
1. The highest temperature attained by a super conductor is
24 K
133 K
150 K
300 K
Correct Answer
Wrong Answer
2. The newly discovered high temperature super conductors are
Metal alloys
Pure rare earth metals
Ceramic oxides
Inorganic polymers
Correct Answer
Wrong Answer
3. The characteristic of super conductor is
High permeability
Low permeability
Zero permeability
Infinite permeability
Correct Answer
Wrong Answer
4. At which temperature superconductivity can be of tremendous economic interest saving billions of rupees?
At very low temperature
At a temperature when semiconductor becomes a super conductor
At room temperature
At a very high temperature
Correct Answer
Wrong Answer
5. The resistance of a semi-conductor on heating
Remains constant
Decreases
Increases
None of the above
Correct Answer
Wrong Answer
6. Electric conduction in a semi- conductor takes place due to
Electrons only
Holes only
Both electrons and holes
Neither electrons nor holes
Correct Answer
Wrong Answer
7. At absolute zero temperature, the electric resistance in semi-conductor is
Infinite
Meager
High
Zero
Correct Answer
Wrong Answer
8. Which one of the following metals is used as semi-conductor in transistors?
Copper
Germanium
Graphite
Silver
Correct Answer
Wrong Answer
9. The most commonly used material for making transistors is
Aluminium
Silicon
Copper
Silver
Correct Answer
Wrong Answer
10. Which one of the following is an important component of a transistor?
Arsenic
Germanium
Osmium
Radium
Correct Answer
Wrong Answer
11. Which of the following is a semi- conductor?
Plastic
Aluminium
Wood
Germanium
Correct Answer
Wrong Answer
12. The Government of India has totally banned the export of Burnt coal (Jhama) because it contains recoverable amount of a metal/ element which is used in transistors. Which one of the following is that element?
Phosphorus
Germanium
Silicon
Tungsten
