2. Distinguish between drift velocity and mobility.
3. Define electrical resistivity. (MAY 22)
4. Define temperature coefficient of resistivity.
5. State the principle of potentiometer.
6. State Joule‟s law of heating
7. What is See beck effect?
8. What is Thomson effect?
9. What is Peltier effect? (AUG 21)
10. Why nichrome is used as heating elements in electrical appliances?
11. Determine the number of electrons flowing per second through a
conductor, when a current of 32 A flows through it. (Example 2.4) (JUNE
23)
12. If the resistance of coil is 3Ω at 200 C and α = 0.004/0C then
determine its resistance at 1000C. (Exam 2.13) (MARCH 23)
13. If an electric field of magnitude 570𝑁𝐶 −1, is applied in the copper
wire, find the acceleration experienced by the electron. (Example 2.2)
(SEP 20)
14. Calculate the equivalent resistance for the circuit which is
connected to 12 V battery and also find the potential difference across
2Ω and 4Ω resistors in the circuit.(Model Exam 2.8) (JULY 22)
15. The resistance of a nichrome wire at 200𝐶 is 10 𝛺. If its
temperature coefficient of resistivity of nichrome is 0.004/0 𝐶,find the
resistance of the wire at boiling point of water. Comment on the
result.(Ex-4, CH-2) (MAR 20)
16. A copper wire of 10–6 m2 area of cross section, carries a current of
2 A. If the number of free electrons per cubic meter in the wire is
8×1028, calculate the current density. (Ex-3, CH-2) (JUNE 24)
17. A cell supplies a current of 0.9 A through a 2 Ω resistor and a
current of 0.3 A through a 7 Ω resistor. Calculate the internal
resistance of the cell.(Ex-8,CH-2) (MAR 25)
1. What is Seebeck effect? State the applications of Seebeck effect.
(JULY 22, MAR 24)
2. Obtain the macroscopic form of Ohm‟s law from its microscopic form
and discuss its limitation.
3. State and explain Kirchhoff‟s rules. (MAR 23,25, AUG 21, SEP 20)
4. State and explain the principle of potentiometer. (JUNE 23)
5. Relation between current and drift velocity. (MAY 22)
6. Derive the expression for power P=VI in electrical circuit.
7. A Copper wire of cross-sectional area 0.5 𝑚𝑚 2 carries a current of
0.2 𝐴. If the free electron density of copper is 8.4×1028 𝑚 −3 then
compute the drift velocity of free electrons. (Example 2.3) (MAR 24)
12th Physics Chapter 2 Important - 5 Marks
1. Describe the microscopic model of current and obtain general form of
Ohm‟s law. (MAR 23)
2. Explain the equivalent resistance of a series (JUNE 24) and parallel
resistor network. (AUG 21)
3. Explain the determination of the internal resistance of a cell using
voltmeter. (MAY 22)
4. Obtain the condition for bridge balance in Wheatstone‟s bridge. (JUNE
23, JULY 22, SEP 20)
5. Explain the determination of unknown resistance using Meter Bridge.
(MAR 24)
6. How the emf of two cells are compared using potentiometer? (MAR
20,25, JUNE 24)
7. Explain cells in series and parallel.
8. Explain the determination of the internal resistance of a cell using
potentiometer?
வாசகர்களின் கருத்துக்களை அன்புடன் வரவேற்கின்றோம்.