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

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

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1-2 Marks Very Short/Short Answer Questions

1. Of metals and alloys, which has greater value of temperature coefficient of resistance?
Answer

2. Manganin is used for making standard resistances. Why?
Answer

3. A wire of resistivity p is stretched to double its length, what will be the new resistivity?
Answer

4. Draw a circuit diagram of a metre bridge arrangement to determine an unknown resistance. Explain the principle of the experiment and give the formula used.
Answer

5. How much current will an electric heater rated at 1 kW draw when connected to a 220 V supply?
Answer

6. How much current will an air-conditioner rated at 2-5 &W, draw when connected to a 220 V supply?
Answer

7. State Ohm’s law. Show that the resistance of a conductor depends upon its shape.
Answer

8. How much is the current flowing through a heater rated at 3 kW when connected to a 100 V d.c. supply?
Answer

9. A voltage of 30 V is applied across a colour coded carbon resistor with first, second and third rings of blue, black and yellow colours. What is the current flowing through resistor?
Answer

10. A voltage of 5 V is applied across a colour code carbon resistor in the first, second and third rings of brown, black and red colours. What is the current flowing through resistor?
Answer

11. A carbon resistor of 47 kΩ is to be marked with rings of different colours for identification. What is the sequence of colours?
Answer

12. Write two special characteristics of manganin due to which it is used in making standard resistances.
Answer

13. The V-I graphs for parallel and series combination of two metallic resistors are as shown in the figure. Which graph represents parallel combination? Justify your answer.

Answer

14. On a given resistor, the colour bands are in the sequence green, violet and red. What is the resistance ?
Answer

15. There are two conductors A and B of the same material having lengths / and 2l; radii r and r/2 respectively. What is the ratio of their resistances?
Answer

16. State one main difference between primary and secondary cell.
Answer

17. The sequence of bands on a carbon resistor are yellow, red, orange and silver. What is (i) its resistance, (ii) tolerance?
Answer

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