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ICSE Class 10 Physics Solved Question Paper 2016

Short Answer Type

1. i) Give an example of a non-contact force which is always attractive in nature.
ii) How does the magnitude of this non-contact force n the two bodies depend on the distance of separation between them?

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2.
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes.

Compare:

(i) The work done by them.
(ii) The power developed by them

Given:

Weight of the boy = force of gravity of the boy = 40 kgf
Time taken by the boy,t_b = 4minutes = 4 x 60 s = 240 s
Weight of the girl= Force of gravity of the girl, F_g = 30 kgf
Time taken by the girl, t_g = 3 minutes = 3 x 60 s = 180 s
Distance covered by both in 30 steps is,

D = 30 x 20 = 600 cm

While climbing upstairs, both have to do work against the force of gravity.

i) Work done by the boy in climbing the stairs is,

W_b = F x D = 40 kgf x 600 cm
i.e., W_b = 24000 J

Work done by the girl in climbing the stairs is:

W_g = F x D = 30 kgf x 600 cm

W_g = 18000 J

Therefore,

$straight W subscript straight b over straight W subscript straight g equals 4 over 3$
ii) Power developed = $fraction numerator Work space done over denominator time space taken end fraction$

Boy:
Power developed = $fraction numerator 24000 space straight J over denominator 240 space straight s end fraction space equals space 100 space W$
Girl:

Power developed = $fraction numerator 18000 space straight J over denominator 180 space straight s end fraction space equals space 100 space W$
Therefore, the power developed by them is 1:1

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With reference to the terms Mechanical Advantage, Velocity Ratio and efficiency of a machine, name and define the term that will not change for machine of a given design.

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Calculate the mass of ice required to lower the temperature of 300 g of water from 40^o C to water at 0^o C.
[Specific latent heat of ice = 336 J/g, specific heat capacity of water = 4.2 J/g^o C]

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What do you understand by the following statements:

i) The heat capacity of the body is 60 JK^-1
ii) The specific heat capacity of lead is 130 Jkg^-1 K^-1

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State two factors upon which the heat absorbed by a body depends:

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A boy uses blue colour of light to find the refractive index o fglass. He then repeats the experiment using red colour of light. Will the refractive index be the same or different in the two cases? Give a reason to support your answer.

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Copy the diagram given below and complete the path of the light ray till it emerges out of the prism. The critical angle of glass is 42^o. In your diagram mark the angles wherever necessary.