A. the amplitude of vibration of the atoms varies with temperature
B. the electron density varies with temperature
C. the electron gas density varies with temperature
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Related Mcqs:
- By increasing impurity content in the metal alloy the residual resistivity always_____________?
- A. decreases B. increases C. remains constant D. becomes temperature independent...
- High resistivity materials are used in_____________?
- A. precision instruments B. heating elements C. motor starters D. incandescent lamps E. all of the above...
- On which of the following factors does the resistivity of a material depend ?
- A. Resistance of the conductor B. Area of the conductor section C. Length of the conductor D. All of the above...
- Which of the following affect greatly the resistivity of electrical conductors ?
- A. Composition B. Pressure C. Size D. Temperature...
- Addition of 0.3 to 4.5% silicon to iron ________ the electrical resistivity of iron?
- A. increases B. decreases C. does not change...
- Low resistivity materials are used in__________?
- A. transformer, motor and generator windings B. transmission and distribution lines C. house wiring D. all above applications...
- Which of the following factors affect resistivity of metals ?
- A. Age hardening B. Alloying C. Temperature D. Cold work E. All of the above...
- Carbon rods are used in wet and dry cells because_____________?
- A. carbon rod serves as conductor B. carbon can resist the attack of battery acid C. both (A) and (B) D. either (A) or (B)...
- Copper, even though costly, finds use in the windings of electrical machines because_____________?
- A. copper points offer low contact resistance B. copper can be easily soldered and welded E. copper windings are less bulky and the machines become compact D. all of the above...
- The metal having the lowest temperature coefficient of resistance is_________________?
- A. gold B. copper C. aluminium D. kanthal...
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