मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

1 H.P. is equal to

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प्रश्न

1 H.P. is equal to

पर्याय

  • 1 W

  • 1 J

  • 746 J

  • 746 W

MCQ
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उत्तर

746 W

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पाठ 4: Energy - Objective questions [पृष्ठ ७७]

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एस.एस. शोम Concise Physics [English] Class 8 ICSE
पाठ 4 Energy
Objective questions | Q 4.5 | पृष्ठ ७७

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.

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


1 H.P. = .........


Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is


What is the minimum velocity with which a body of mass m must enter a vertical loop of radius R so that it can complete the loop?.


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)


Sand is being dropped from a stationary dropper at a rate of 0.5 kgs-1 on a conveyor belt moving with a velocity of 5 ms-1. The power needed to keep belt moving with the same velocity will be ______.


Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 ms-1. (g = 10 ms-2)


Name the quantity which is measured in eV.


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