Physics, Chap 2, Comprehensive Questions
PHYSICS
Class 12
Comprehensive Questions
Chapter 12
| Question 1 | Describe the concept of steady current as a flow of positive, negative charge or both. Define the unit of current. See answer |
| Question 2 | Explain the electronic current in a metallic wire as due to the drift of free electrons in the wire.
See answer |
| Question 3 | State Ohm’s Law. Discuss its scope and validity. (a) Discuss resistivity and conductivity of a material. (b) How does resistance change with temperature? See answer |
| Question 4 | Explain the terms: emf, internal resistance and terminal potential difference of a battery.
See answer |
| Question 5 | Explain the construction of rheostat. How is it used as (a) control the current (b) as potential divider?
See answer |
| Question 6 |
What is Wheatstone bridge? Explain with diagram the balancing, the principle and working of this bridge. See answer |
| Question 7 |
What is potentiometer? Explain the principle, construction and working. What is advantage of using potentiometer for measuring potential difference? See answer |
| Question 8 |
What is thermocouple? Explain the working of a thermocouple by drawing its diagram. By sketching curve explain the variation in thermocouple emf with temperature. See answer |
| Question 9 | Why we use Kirchhoff’s law for circuit problems solution? Explain its rules for circuit solution by giving proper example. See Answer |
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