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Fill in the following blanks with suitab...

Fill in the following blanks with suitable words :
(a) Power is the rate of doing …….
(b) 1 watt is a rate of working of one………… per ………..
(c) The electricity meter installed in our home measures electric energy in the units of ………
(d) The principle of ........... of energy says that energy can be ........... from one form to another, but it cannot be.............. or..................
(e) When a ball is thrown upwards,......... energy is transformed into ................energy.

Text Solution

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The correct Answer is:
(a) work (b) joule ; second (c) kWh (d) conservation ; transformed ; created ; destroyed (e) kinetic : potential

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LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. Name the devices or machines which convert : (a) Mechanical energy i...

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  2. Name the devices or machines which convert : (i) Electrical energy i...

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  3. Fill in the following blanks with suitable words : (a) Power is the ...

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  4. A trolley is pushed along a road with a force of 400 N through a dista...

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  5. What kind of energy transformations take place at a hydroelectric powe...

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  6. What kind of energy transformations take place at a coal-based thermal...

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  7. A man weighing 500 N carried a load of 100 N up a flight of stairs 4 m...

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  8. The power output of an engine is 3 kW. How much work does the engine d...

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  9. An electric heater uses 600 kJ of electrical energy in 5 minutes. Calc...

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  10. How much electrical energy in joules does a 100 watt lamp consume : ...

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  11. Five electric fans of 120 watts each are used for 4 hours. Calculate t...

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  12. Describe the energy changes which take place in an radio.

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  13. Write the energy transformations which take place in an electric bulb ...

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  14. Name five appliances or machines which use an electric motor.

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  15. A bulb lights up when connected to a battery. State the energy change ...

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  16. The hanging bob of a simple pendulum is displaced to one extreme posit...

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  17. A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, g...

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  18. (a) What is the meaning of the symbol kWh ? What quantity does it repr...

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  19. (a) Derive the relation between commercial unit of energy (kWh) and SI...

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  20. (a) Define power. Give the SI unit of power. A boy weighing 40 kg ca...

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