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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 33

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10th CBSE

IMPORTANT

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An electric heater is rated at $2 kW$ . Electrical energy costs $₹ 4 p e r kWh$ . What is the cost of using the heater for $3 hours$ ?

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Important Questions on Electricity

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 34

The SI unit of energy is:

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 35

The commercial unit of energy is:

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10th CBSE

IMPORTANT

Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 36

How much energy does a $100 W$ electric bulb transfer in

1 minute

?

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10th CBSE

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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 37

An electric kettle for use on a $230 V$ supply is rated at $3000 W$ . For safe working, the cable connected to it should be able to carry at least:

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10th CBSE

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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 38

How many joules of electrical energy is transferred per second by a $6 V, 0.5 A$ lamp?

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10th CBSE

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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 39

At a given time, a house is supplied with $100 A$ at $220 V$ . How many $75 W$ , $220 V$ light bulbs could be switched on in the house at the same time (if they are all connected in parallel)?

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10th CBSE

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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 40

If the potential difference between the ends of a fixed resistor is halved, the electric power will become:

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10th CBSE

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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Questions Based on High Order Thinking Skills (HOTS)>Q 41

State whether an electric heater will consume more electrical energy or less electrical energy per second when the length of its heating element is reduced. Give reasons for your answer.