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CBSE->Std 10 Questions

Total Questions 2595
41) You are given two fuse wire A and B with current rating 2A and 5A respectively .Which of the two wires would you select for use with a 1000W, 220 V room heater ? justify your answer .
35) If a 12V battery is connected to the arrangement of resistance given alongside ,calculate a) total effective resistance of the arrangEment b) the total current flowing in the circuit
34) A wire of resistance 10? is bent in the form of closed circle.What is the effective resistance between two points at ends of any diameter of circle.
15) A 60W eletric lamp gives off energy in the form of light at the rate of 7.5J/sec .What perentage of energy does the lamp transform into light energy ?
10) A heater coil is rated 100W , 200V .If is cut into two identical parts. Both parts are connected together in parallel to the same source of 200V. Calculate the energy liberated per second in the new combination.
1) A heater joined in parallel with a 60W buld is connected to the mains . If the bulb is replaced by a 100W bulb will the rate of the heat produced by the heater remain same, increase or decrease.
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