Subject

Physics

Class

ICSE Class 10

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

Why are infra-red radiations preferred over ordinary visible light for taking photographs in the fog? 


Infra-red radiations are preferred for taking photo-graph in fog because it scatters less and can penetrate through fog so photography can be done easily.

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2.

The diagram given alongside shows a right-angled prism with a ray of light incident on the side AB (The critical angle for glass is 42o)

i) copy the diagram and complete the path of the ray of light in and out of the glass prism.

ii) What is the value of the angle of deviation shown by the ray?

i) The path of the ray of light through a right-angled prism is given below: 

                                         

ii) Angle of deviation which is shown by ray = 90o 

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3.

An object is placed in front of a converging lens at a distance greater than twice the focal length of the lens. Draw a ray diagram to show the formation of the image? 


i) The formation of the image is as shown below 


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4.

State Snell’s Law of Refraction of light. 


Snell’s Law of refraction of light states that the ratio of sine of angle of incidence to the sine of angle of refraction is constant for a given pair of media.

This constant is called refractive index of the medium. 


                                            fraction numerator sin function application i over denominator sin function application r end fraction equals n

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5.

How can the work done be measured when force is applied at an angle to the direction of displacement? 


Work done = Force × component of displacement in the direction of force

Work done, W = Fd cos θ

where,

θ is the angle between force and displacement

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6.

Write an expression to show the relationship between mechanical advantage, velocity ratio and efficiency for a simple machine? 


Relation between mechanical advantage, velocity ratio and efficiency is, 

E f f i c i e n c y equals space fraction numerator M. A. over denominator V. R. space end fraction cross times 100

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7.

Mention one difference between reflection of light from a plane mirror and total internal reflection of light from a prism. 


The reflection from a plane mirror depends upon the polishing of the surface whereas in prism the light is totally reflected. 

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8.

What is the main energy transformation that occurs in:

1. Photosynthesis in green leaves;

2. Charging of a battery 

1) Light energy is converted into chemical energy.

2) Electrical energy to chemical energy

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9.

Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage? 


Class II lever has a mechanical advantage always greater than 1.

To increase mechanical advantage effort arm must be increased and load arm must be decreased. 

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10.

Two bodies, A and B of equal mass are kept at heights 20 m and 30 m respectively. Calculate the ratio of their potential energies. 


Given two bodies of equal mass, 

Height of A = 20 m

Height of B = 30 m

fraction numerator straight P. straight E subscript 1 over denominator straight P. straight E subscript 2 end fraction space equals space fraction numerator m g h subscript A over denominator m g h subscript B end fraction equals fraction numerator m space cross times space g space cross times 20 over denominator m space x space g space x space 30 end fraction

fraction numerator P. E subscript 1 over denominator P. E subscript 2 end fraction space equals space 2 over 3

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