28. Which of the following statements are correct ?
1. In semiconductor, the mobility of electrons is more than that of holes.
2. In semiconductor, when temperature increases, the resistivity also increases.
3. Metal has positive TCR.
4. In metals, thermal conductivity is inversely proportional to electrical conductivity at constant temperature.
(a) 1, 2, 3
(b) 1, 2, 4
(c) 2, 3, 4
(d) 1, 3, 4
Answer : (d)
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Topic Name : Semiconductor Materials
Subtopic Name : Electrical & Electronic Materials & Components
Subject Name : Electronics Engineering
Exam Name : IIT GATE, UPSC ESE, PSC JE, RRB JE, SSC JE, DMRC JE, BSNL JE
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