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Monday, 14 September 2015

Electricity test paper 2

 Electricity test paper,resistivity,resistance,volt,ampere ,circuit,fuse
                   ELECTRICITY

MARKS-30 
Instructions:
 Questions : 1 to 5 – 1 Mark each
 Questions : 6 to 9 – 2 Marks each
 Questions : 10 to 13 – 3 Marks each
 Question 14 – 5 Marks

1. Define resistivity of material.

2. What is the power of torch bulb rated at 2.5V and 500mA?

3. Why series arrangement not used for connecting domestic electrical appliances in a circuit?

4. Which has higher resistance – a 50W bulb or a 2.5W bulb and how many times?

5. What is the direction of flow of conventional current?

6. Why is it not advisable to handle electrical appliances with wet hands?

7. Two electric bulbs marked 100W 220V and 200W 200V have tungsten filament of  same length. Which of the two bulbs will have thicker filament?

8. How does the resistance of a wire vary with its area of cross section?

9. Draw the following symbols
(i) Battery (ii) Switch closed
(iii) Resistor of resistance R (iv) Voltmeter

10. A geyser is rated 1500W, 250V. This geyser is connected to 250V mains. Calculate

i. The current drawn
ii. The energy consumed in 50hrs.
iii. The cost of energy consumed at Rs. 2.20 per kWh.

11. What is the function of an electric fuse? Name the material used for making fuse. In household circuit where is fuse connected?

12. Write one important advantage of using alternative current. How alternating current differ from direct current?

13. What is the difference between short circuiting and overloading?

14. a) Draw diagram showing three resistors R1, R2 and R3 in series.
b) Two resistors of resistance 4 and 12
i) In parallel
ii) In series
Calculate the values of effective resistance in each case.
 Electricity test paper,resistivity,resistance,volt,ampere ,circuit,fuse
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