Class 12 Physics Thermoelectric Effects Notes and Important Questions
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Notes for Class 12 Thermoelectric Effects (Physics) are shown above.
Practice
Important Questions
The figure shows the variation of thermo emf with the temperature of the hot junction, when the cold junction is at 0°C.
What is thermoelectric effect?
Define θₙ and θᵢ.
What will be the effect on θᵢ if we shift the cold junction to −10°C?
Give one of the applications of such thermocouple.
Which of the following is the phenomenon of production of emf by maintaining a difference of temperature between two junctions of dissimilar metals?
Joule’s effect
Seebeck effect
Peltier effect
Thomson’s effect
For a thermocouple, the inversion temperature is 600°C and the neutral temperature is 320°C. Find the temperature of the cold junction
40°C
20°C
80°C
60°C
The temperature of inversion of a thermocouple is 600°C and the neutral temperature is 310°C. What must be the temperature of cold junction?
0°C
10°C
20°C
30°C
Which of the following represents the process of production of emf by maintaining a difference of temperature between the two junctions of a loop of two dissimilar metals?
Seebeck effect
Joule effect
Peltier effect
Thomson effect
The neutral temperature of a thermocouple is equal to when the temperature of cold junction is . Percentage change in the temperature of inversion when temperature of cold junction is equal to is
$2%$
$3%$
$4%$
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Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
5
Question Items
3
Total Marks
5
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2083 | 1 | 1 |
| 2082 | 1 | — |
| 2081 | 1 | 1 |
| 2080 | 1 | — |
| 2078 | 1 | 1 |
Also appears in 3 model questions (not counted above — model sets aren't actual NEB exam history).
The interaction between temperature differences and electricity forms the focus of this chapter. Students learn about Seebeck and Peltier effects, thermocouples, thermoelectric emf and thermopiles.
This page covers Thermoelectric Effects, chapter 15 of 25 in the Class 12 Physics syllabus set by the National Examination Board (NEB). 7 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.