$1 \mathrm{watt}$ is equal to:

Important Questions on Work and Energy

EASY

9th CBSE

IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 5

 In terms of mass, length and time, Watt is represented by

EASY

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 6

Power is expressed as :

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 7

 An electric lamp consumes $1000 \text{J}$ of electrical energy in $10$ second. The power of lamp is :    

MEDIUM

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 8

An electric heater is rated $1500 \text{W}$. The energy used by it in $10$ hours is :

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 9

The energy consumed (in $\mathrm{KWh}$) by four devices of $500 \mathrm{W}$ each in $10$ hours is:

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 10

A machine does a work of $1960 \text{J}$ in $24 \mathrm{s}$. The power of the machine is :

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 11

An engine does a work of $600 \text{J}$ in $1$ minute. The power of engine in kilowatts is :

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IMPORTANT

Core Science Physics For Class 9>Chapter 4 - Work and Energy>EXERCISE>Q 12

A boy of mass $50 \text{Kg}$, runs up a flight of $120$ stairs, each measuring $25 \text{cm}$ in one minute and $40$ seconds. If $\mathrm{g}=10 \mathrm{m}/{\mathrm{s}}^2$ the power of the boy is: