Everyday Science Examination 1977

Time allowed: 2 hours
Maximum marks: 50

Note: (i) Attempt any ten questions.
(ii) Each question carry equal marks.

1.   Under what principles is electricity produced by water held up by a dam? What is the difference, in principle, between the atom bomb and the hydrogen bomb?
2.   Explain:
   Why is it easier to push a heavy grass mover than to lift it.
   How does a hot Cup of tea lose its heat?
3.    Elucidate.
   (i) in what ways arc living beings different from inanimate things.
   (ii) how is a rainbow formed.
4.    How can steel be manufactured from ore?
   Explain with reference o the conditions in Pakistan.
5.    What are trade winds and’ anti-trade winds? How and when are they formed?
6.    What is the difference between small-pox and measles? Can these diseases be prevented? If so, how?
7.    How is crude petroleum refined?
   What are the petroleum products and their uses?
8. What is the duration of day and night in the polar regions. Explain with reasons.
9.  How do plants make their food? What is the end product in this process?
10.   How does a movie camera operate and how is a film prepared?
11.    In what way does the theory of evolution explain the origin of species?
12.    Elucidate the mechanism whereby a submarine ne is able to operate under the sea.
13.    Compare and contrast, in respect of their contribution.to science
    i) Newton and Einstein.
    ii) Kepler and Copernicus.
    iii) Darwin and Lamarck.
14.    Explain the process of circulation of blood through the heart.