Short Answer TypeA ray of monochromatic light is incident from air on a glass slab:
i) Draw a labelled diagram showing the change in the path of the ray till it emerges from the glass slab.
ii) Name the two rays that are parallel to each other.
iii) Mark the lateral displacement in your diagram.i)
iii) Lateral displacement is marked by X in the diagram.
Two parallel rays of Red and Violet traveling through air, meet the air-glass boundary as shown in the above figure.
i) Will their paths inside the glass be parallel? Give a reason for your answer.
ii) Compare the speeds of the two rays inside the glass.We can burn a piece of paper by focusing the sun rays by using a particular type of lens.
i) Name the type of lens used for the above purpose.
ii) Draw a ray diagram to support your answer.A ray of light enters a glass slab PQRS, as shown in the diagram. The critical angle of the glass is 42o. Copy this diagram and complete the path of the ray till it emerges from the glass SLAB. Mark the angles in the diagram wherever necessary.
Name the subjective property:
i) of sound related to its frequency.
ii) of light related to its wavelength.
Two waves of the same pitch have ther amplitudes in the ratio 2:3.
i) What will be the ratio of their loudness?
ii) What will be the ratio of their frequencies?A man stands at a distance of 68 m from a cliff and fires a gun. After what time interval will he hear the echo, if the speed of sound in air is 340 m/s?
ii) If the man had been standing at a distance of 12 m from the cliff would he have heard a clear echo?Six resistances are connected together as shown in the fig. Calculate the equivalent resistance between the point A and B. 
Calculate the quantity of heat that will be produces in a coil of resistance 75 ohm if a current of 2 a is passed through it for 2 minutes.
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