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» CBSE Physics Current Electricity Expected Questions for Quick Revision : Unit II : CBSE Sample Question Papers

CBSE Physics Current Electricity Expected Questions for Quick Revision : Unit II

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3 Marks Questions [Numerical and Derivation Type)

1. Draw circuit diagram for comparing two reistances, using a metre bridge. Write the principle of the experiment. Why is this method used for two resistances of the same order of magnitude ?
Answer

2. With the help of a circuit diagram, explain how you would compare the resistances of two given resistors using the potentiometer ?
Answer

3. A dry cell of e.m.f. 1.6 V and internal resistance 0 • 1 Q is connected to a reistor R ohm. If the current drawn from the tell is 2A
(i) What is the voltage drop across it ?
(it) What is the energy dissipated by the resistor ?
Answer

4. Define the term resistivity of a conductor. How does resistivity of a conductor vary with temperature ?
Answer

5. A wire of resistance 1 Q is drawn out so that its length is three times the original length. Calculate the new resistance, resistivity and density remains unchanged.
Answer

6. Two cells of e.m.f. E1, and E2 (E1 > E2) are connected as shown in the figure.
When it potentiometer is connected across A and B, the balancing length of the potentiom¬eter is 300 cm. On connecting the same pot¬entiometer between A and C, the balancing length is 100 cm. Calculate the ratio of E1 and E2.
4
Answer

7. Determine the voltage drop across resistor in the circuit with E - 80 V ; R1 = 16 Q ;
R2 = 36Q ; R3 = 54Q ; R4 = 18 Q.
5
Answer

8. Define e.m.f. of a cell. Show that the voltage drop across a resistor connected in parallel with a coil is different from the e.m.f. of the cell.
Answer

9. A battery of e.m.f. 3 V and internal resistance r is connected in series with a resistor of 550 through an ammeter of resistance 1 ohm. The ammeter reads 50 mA. Draw the circuit diagram and calculate the value of r.
Answer

10. With the help of a suitable diagram, explain the construction and working of a dry cell.
Answer

11. Explain the working of acid storage cell. What is its draw back ?
Answer

12. Explain the working of NIFE cell. What is its plus point ?
Answer

13. Two identical cells of e.m.f. 1 • 5 V each joined in parallel provide supply to an external circuit consisting of two resistances of 17Q each joined in parallel. A very high resistance voltmeter reads terminal voltage of the cells to be 1 • 4 V. Calculate internal resistance of each cell.
Answer

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