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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

1 H.P. is equal to - Physics

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प्रश्न

1 H.P. is equal to

पर्याय

  • 1 W

  • 1 J

  • 746 J

  • 746 W

MCQ

उत्तर

746 W

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पाठ 4: Energy - Objective questions [पृष्ठ ७७]

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

संबंधित प्रश्‍न

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.

Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10 m/s-1. Calculate the power exerted.


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 electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?


If a 1200 W electric iron is used daily for 30 minutes, how much total electricity is consumed in the month of April?


A ball with a velocity of 5 ms−1 impinges at an angle of 60˚ with the vertical on a smooth horizontal plane. If the coefficient of restitution is 0.5, find the velocity and direction after the impact.


A bullet of mass 20 g strikes a pendulum of mass 5 kg. The centre of mass of the pendulum rises a vertical distance of 10 cm. If the bullet gets embedded into the pendulum, calculate its initial speed.


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 = 10 m/s2)  


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)


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