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ICSE Physics Class X Important Papers By M. P. Keshari

Spectrum and Colours (Solved)

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Question .1. Write down the following and fill in the blanks spaces with appropriate colours :

(a) Green + Magenta = ___________. 

(b) Red + _________ = Yellow.

(c) Red + Blue = _____________. 

(d) Blue + _________ = Cyan.

(e) Yellow + Blue = _________ . 

(f)  Magenta + ___________ = White.

(g) _______ + Red  = White.

(h) Red + ________ + Green = White.

(i) A red rose appears ________ when seen in green light.

(j) A piece of red cloth appears red in white light because it _________ blue and green and ______ only red.


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Question .2. Write down the colour spectrum produced when white light is passed through a
prism. Which of these colours is deviated most ?


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Question .3. What is the wavelength of the electromagnetic wave whose frequency is
1012 Hz ? Name this electromagnetic wave.

 

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Question .4. Show the effect of mixing two primary colours through labelled colour triangle.


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Question .5. Give one useful and one harmful effect of ultra violet radiation on the human
body. 

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Question .6. Define a pair of complementary colours. Name the colours in one such pair.


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Question .7. Define dispersion of light.


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Question .8. Explain briefly how white light gets dispersed by a prism. 


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Question .9. Draw a diagram to show that white light can be split up into different colours.
Draw another diagram to show how the colours can be combined to give the effect of white light . 


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Question .10. Name the extreme colours in a pure spectrum of light. 


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Question .11. State the equation for the relation between frequency and wavelength of light in
vacuum.


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Question .12. Name any four regions of electromagnetic spectrum (other than visible light)
in increasing order of wavelength.


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Question .13. Name any two electromagnetic waves which have a frequency higher than that
of violet light. State one use of each.


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Question .14. Give one use each of the electromagnetic radiation given below :

(i) microwave

(ii) ultra violet radiation

(iii) infrared radiation.

 

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Question .15. How would you show the presence of UV and IR rays in the spectrum?


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Question .16. When yellow paint and blue paint are mixed we get green colour. When yellow
light and blue light are mixed, white light is obtained. Give reasons. 


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Question .17. A green shirt is observed in blue light. What colour it will appear to be and
why ? 


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Question .18. Explain why in day light  an object appear red when seen through a red glass
and black when seen through a blue glass ?


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Question .19. Write the names of a pair of colours which combine to give white light. What
is the  name given to such a pair of colours ?


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Question .20. A flag is made up of three strips of cloth of yellow, white and cyan colours. Name  the colour of a particular light in which this flag will appear to be of a single colour.


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Question .21. (i) White light is passed through a yellow filter. What colour is (colours are) seen on a screen plated at the end ?

(ii) If the light emerging from the yellow filter is then passed through a red filter,   what will be seen on the screen placed at the end ?


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Question .22. What will be the colour of an object which appears green in white light and
black in red light ?



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Question .23. Give the approximate range of wavelengths in vacuum associated with UV
rays and visible light.



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Question .24. A TV station transmits waves of frequency 200 MHz. Calculate the wavelength of the waves if  their speed in air is 3.0 × 108 m s-1.



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Question .25. Why are infrared radiations preferred over ordinary visible light for taking
photograph in fog ?



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Question .26. (i) What will be the colour of a blue flower when it is seen in magenta coloured
light?

(ii) Name another secondary colour of light in which the flower will show the same colour as it shows in the magenta coloured light.

 


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Question .27. (i) A particular type of high energy invisible electromagnetic rays help us to
study the structure of crystals. Name these rays and give another important use of these rays.

(ii) How does the speed of light in glass change on increasing the wavelength of
light ?



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Question .28. A room has window pans made of a special glass which can reflect green light,
transmit red light, scatter blue light and absorb all the other colours of light.

The room is illuminated with white light from inside. What colour will the

window pane appear when seen from

(i) inside the room,

(ii) outside the room ?



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Paper By Mr. M. P. Keshari [ For Further Enquiry 09434150289]

 

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