Discussion
Which of the following is not a semiconductor ?
Answer: B
The material that is not a semiconductor is indium.
Indium is a metal of group III (group 13). It conducts like a metal, with no band gap, and in semiconductor work it is used as a dopant (an acceptor in germanium and silicon) or as part of compounds such as indium phosphide, not as a semiconductor on its own.
The other three are semiconductors. Germanium and silicon are the classic elemental semiconductors of group IV, with band gaps of about 0.67 eV and 1.1 eV. Gallium arsenide (spelt 'Galium' in the paper) is a III-V compound semiconductor with a direct band gap of about 1.43 eV, used in LEDs and high-speed devices.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development