Free Temperature Coefficient of Resistivity MCQs with Answers
14 Temperature Coefficient of Resistivity MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Temperature coefficient of resistivity describes how a material's resistivity changes for each degree change in temperature. Questions use the relation between resistance, temperature and the coefficient, especially for metallic conductors with positive values and semiconductors with negative values. Resistivity is a material property, unlike resistance, which also depends on dimensions.
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- A. increases, because the lattice ions vibrate more and impede the electrons
- B. decreases, because the electrons move faster
- C. stays constant
- D. falls to zero
Explanation: More vigorous lattice vibrations scatter the drifting electrons more often, shortening the mean free path and raising resistance, which is…
Correct answer: increases, because the lattice ions vibrate more and impede the electrons- A. positive
- B. zero
- C. negative
- D. always exactly one
Explanation: Heating a semiconductor promotes far more electrons across the energy gap than it adds scattering, so the number of charge carriers rises…
Correct answer: negative- A. 1/C
- B. 1/K
- C. 1/A
- D. 1/s
Explanation: The coefficient is the fractional change in resistivity per unit rise in temperature, so the resistivity units cancel and only reciprocal…
Correct answer: 1/K- A. increase with rise in temperature
- B. decrease with rise in temperature
- C. will remain same
- D. depends upon altitude of experimentation
Explanation: For a metallic wire, increasing temperature increases lattice vibrations, which causes more collisions for electrons and therefore…
Correct answer: increase with rise in temperature- A. Resistance increases with increase of temperature
- B. Resistance decreases with increase of temperature
- C. Resistance decreases with decrease of temperature
- D. Resistance remains same with increase of temperature
Explanation: When resistance increase with an increase in temperature, the material is said to have a positive temperature coefficient.
Correct answer: Resistance increases with increase of temperature- A. Tungsten
- B. Carbon
- C. Nichrome
- D. Platinum
Explanation: Correct option is B.A negative coefficient for a material means that its resistance decreases with an increase in temperature.
Correct answer: Carbon- A. °C
- B. °C-1
- C. m0C-1
- D. None of these
Explanation: Correct option is B.The temperature coefficient of resistance (TCR) measures the change in resistance expressed in degrees Celsius.
Correct answer: °C-1- A. 3.66 x 10 ̄3 k ̄1
- B. 4.66 x 10 ̄3 k ̄1
- C. 6.31 x 10 ̄3 k ̄1
- D. 7.42 x 10 ̄3 k ̄1
- E. 9.49 x 10 ̄3 k ̄1
Explanation: Formula for the temperature coefficient is as follows:= (20-10) / (10 x (273-0))=10/(10 x 273)=1 / 273=3.66 x 10-3 K-1
Correct answer: 3.66 x 10 ̄3 k ̄1- A. Conductivity
- B. Resistivity
- C. Temperature coefficient of resistivity
- D. Temperature coefficient of resistance
Explanation: The temperature coefficient of resistance represents how the resistance of a conductor changes with temperature.
Correct answer: Temperature coefficient of resistance- A. Increases with an increase in temperature
- B. Decreases with a decrease in temperature
- C. Decreases with an increase in temperature
- D. None of the above
Explanation: Materials with a negative temperature coefficient exhibit a decrease in resistance as temperature increases.
Correct answer: Decreases with an increase in temperature- A. Increases.
- B. Decreases.
- C. Becomes zero.
- D. Remains unchanged.
Explanation: The resistance of a metallic conductor increases with temperature because the atoms within the conductor vibrate more with added energy…
Correct answer: Increases.- A. Increase in temperature
- B. Increase in pressure
- C. Decrease in temperature
- D. Decrease in pressure
Explanation: With the increase in temperature, the random motion of electrons increases.
Correct answer: Increase in temperature- A. -0.01
- B. -1/273
- C. 0.01
- D. 1/273
Explanation: (The mcq option seem incorrrect, the only explanation possible is as follows;)Given that,Resistance at 0°C = 100ΩResistance at 100°C =…
Correct answer: 0.01- A. Positive
- B. Negative
- C. Imaginary
- D. Zero
Explanation: The temperature coefficient of resistance for a semiconductor is negative, indicating that its resistance decreases as temperature…
Correct answer: NegativeTemperature Coefficient of Resistivity MCQs: common questions
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