CUET · PHYSICS · PYQ PAPER 2023
Which of the following are correct statements?
A. The resistivity of a material is found to be dependent on the temperature
B. In metals number of free electrons per unit volume is not dependent on temperature.
C. Resistivity of semiconductors increases with increasing temperature
D. Resistivity of metal increases with increase in temperature
Choose the correct answer from the options given below:
- A A and C only
- B A, C and D only
- C A, B and C only
- D A, B and D only
Answer & Solution
Correct Answer
(D) A, B and D only
Step-by-step Solution
Detailed explanation
In metals, resistivity increases with temperature while the electron density stays constant. For semiconductors, resistivity actually decreases as temperature rises because more charge carriers become available, making Statement C incorrect. D) A, B and D only
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