Physics - Current Electricity

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26. An electric stove boils 1 kg of water in time 2 min and another stove boils 1 kg of water in time 3 min. Both electric stoves are designed for the same voltage. When they are joined in parallel, the time required to boil 1 kg of water is (NTSE Andhra Pradesh, Stage-I, 2014-15)

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27. If a wire of resistance 1 Ω is stretched to double its length, then resistance will be ((NTSE West Bengal, Stage-I, 2014-15)

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28. Vm-1 is the unit of (NTSE West Bengal, Stage-I, 2014-15)

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29. What will be the power consumed by 25 Ω wire if it is put across a mains of 250 volts? (NTSE West Bengal, Stage-I, 2014-15)

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30. In the circuit given below what will be the ratio of current flowing in the upper arm R and lower arm R?

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