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Class 12 Physics: Current Electricity
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MCQs on electric current, ohms law and its limitations, electrons drift and resistivity origin, various materials resistivity, electrical energy and power, resistivity temperature dependence, resistors combination, cells, emf and internal resistance, kirchoffs law, potentiometer, wheatstone and meter bridges.

Class 12 Physics: Current Electricity
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25 Questions

1. A current of 3 A passes through an electric circuit for 5 minutes and does a work of 900J. What is the emf of the source?
2. A potentiometer has uniform potential gradient. The specific resistance of the material of the potentiometer wire is 10-9Ωm and the current passing through it is 0.5A and the cross sectional area of the wire is 10-8m2. Calculate the potential gradient along the potentiometer wire.
3. Which of these is a correct definition of conventional current?
4. Identify the definition of sensitivity of a galvanometer from the following.
5. Calculate the number of units of electricity used if a bulb of 100 W is kept on for 5 hours.
6. The emf of a battery is 86V and internal resistance 1 ohms in the figure shown below. Calculate the current drawn from the battery.
7. What will be the grouping of cells when the current in the circuit is \(\frac {ne}{(R + nr)}\)?
8. The equation → ∑e = ∑IR is applicable to which law?
9. Find the resistance value of the carbon resistor if the colors of the four bands are yellow, violet, brown and gold respectively.
10. A potentiometer using cell C of emf 5V and internal resistance 0.2 ohms is connected to a wire AB in the figure below. A standard cell C0 of a constant emf of 1.10 V gives a balance point at 55 cm of the wire. When C0 is replaced by a cell of emf E, the balance point is obtained at 85 cm. What is the value of E?
11. The diagram below shows a network of 5 branches. Given: I1 = -5A; I4 = 10A; I5 = 15A
12. What is the reciprocal of resistivity of a material called? Give its unit.
13. Which instrument is used as the null detector in the Wheatstone bridge?
14. Which of the following devices is the more accurate one for the measurement of emf?
15. Which of the following is the most conductive element?
16. Identify the type of conductor represented by the V-I characteristic curve given below.
17. Calculate the value of current I4.
18. Which of the following is correct when one cell is wrongly connected in series circuit?
19. What is the equivalent resistance of series combination of 3 resistors?
20. A resistance of 5 ohms is connected across the gap of a Meter Bridge and an unknown resistance, greater than 5 ohms, is connected across the other gap. When these resistances are interchanged, the balance point shifts by 50 cm. Neglecting any correction, what is the unknown resistance? The length of the wire is 150 cm.
21. Identify the correct statement from the following.
22. What is the study of electric charges in motion called?
23. A group of N cells such its emf EN = 1.5rN is shown in the diagram below. What is the current I in the circuit?
24. The SI unit of electrical energy is ____________
25. In the Wheatstone bridge given below, what should be values of R1 and R2 so that the bridge is balanced?

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