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ICSE Class 10 Physics Solved Question Paper 2009

Short Answer Type

What is the SI unit of energy? How is the electron volt (eV) related to it?

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State the energy changes that takes place in the following when they are in use:

i) a photovoltaic cell

ii) an electromagnet

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3.
A body of mass 5 kg is moving with a velocity of 10 m/s. What will be the ratio of its initial kinetic energy and final kinetic energy, if the mass of the body is doubled and its velocity is halved?

K. E subscript 1 space equals space 1 half space m v squared space italic space italic space italic space italic space italic space italic space italic space italic space equals space 1 half space cross times space 5 space cross times space left parenthesis 10 right parenthesis squared space italic space italic space italic space italic space italic space italic space italic space italic space italic space equals 1 half cross times 500 space equals space 250 space J K. E subscript italic 2 space equals space italic 1 over italic 2 space m v to the power of italic 2 space italic space italic space italic space italic space italic space italic space italic space italic space equals space italic 1 over italic 2 space cross times space 10 space cross times space left parenthesis 5 italic right parenthesis to the power of italic 2 space italic space italic space italic space italic space italic space italic space italic space italic space equals space 5 space straight x space 25 space equals space 125 space straight J fraction numerator K. E subscript 1 over denominator K. E subscript 2 end fraction space equals space 250 over 125 space equals 2 over 1

Initial kinetic energy will become twice of the final kinetic energy.

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6.5 kJ of energy causes a displacement of 64 m in a body in the direction of force in 2.5 seconds. Calculate:

i) the force applied

ii) power in horse power(hp)

[ Take 1 hp = 764 W]

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With reference to the terms mechanical advantage, velocity ratio and efficiency of a machine, name the term that will not change for a machine of a given design.

ii) Define the term stated by you in part (i).

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A ray of light strikes the surface of a rectangular glass block such that the angle of incidence is i) 0^o ii) 42⁰. Sketch a diagram to show the approximate the path taken by the ray in each case as it passes through the glass block and emerges from it.

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