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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

The S.I. unit of power is ..........

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प्रश्न

The S.I. unit of power is ..........

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उत्तर

The S.I. unit of power is watt.

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पाठ 4: Energy - Objective questions [पृष्ठ ७६]

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एस.एस. शोम Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Objective questions | Q 2.09 | पृष्ठ ७६

संबंधित प्रश्‍न

The blades of a windmill sweep out a circle of area A.

  1. If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?
  2. What is the kinetic energy of the air?
  3. Assume that the windmill converts 25% of the wind’s energy into electrical energy, and that A = 30 m2, v = 36 km/h and the density of air is 1.2 kg m–3. What is the electrical power produced?

A family uses 8 kW of power.

  1. Direct solar energy is incident on the horizontal surface at an average rate of 200 W per square meter. If 20% of this energy can be converted to useful electrical energy, how large an area is needed to supply 8 kW?
  2. Compare this area to that of the roof of a typical house.

Match the following

column A Column B
A stone at a height power 
A Moving ball   joule
Energy work done in 1 s
 Power potential energy 
Watt kinetic energy 

It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the power spent by then.


Name the physical quantity which is measured in calorie. How is it related to the S.I. unit of the quality?


An engine develops 20 kW power. How much time will it take to lift a mass of 200 kg to a height of 50 m? (g = 10 m/s2)


Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10m/s2)


A man is throwing bricks of mass 2 kg onto a floor from a height of 2 m. Bricks reach the floor at a speed `2sqrt(10)` m/s. Man throws 10 bricks in a minute. If the power of man is W watt then `3/10` W is equal to ______ W.


Unit of power used in mechanical engineering is ______.


Name the quantity which is measured in Wh.


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