Everyday Science CSS Paper 1981

Time Allowed: 2 Hours Maximum Marks: 50

Note: Attempt Eleven questions in all. Question No.1 is compulsory. Be brief and to the point. All questions carry equal marks except question No. 1 which carries 10 marks.

  1. Fill in the blanks:
    (a) Malaria is caused by ____ . (Plasmodium, Mosquito, Trypanosoma)
    (b) Ricks disease is caused by deficiency of vitamin ____ . (C, D, E)
    (c) B. C. G. vaccination is prevention against ____ (Typhoid, Tuberculosis, Diphtheria)
    (d) The smallest organism which cause disease is ____ (Protozoa, Bacteria, Virus)
    (e) Pakistan is supposed to be free from ____ disease. (Poliomyelitis, Malaria, Smallpox)
    (f) If distant object appear blurred due to defective sight, spectacles with ____ lenses are used. (Convex, Concave, Cylindrical)
    (g) Who invented telescope ____ . (Thomas, Edison, Galileo, Samuel, Morse)
    (h) Wires used in carrying electric current were made up of ____ (Iron, Zinc, Copper)
    (i) Human car is divided into ____ parts. (Two, There, Four)
    (j) Image of an object is formed on ____ of the eye. (Comas, Retina, Optic, nerve)

  2. Write short notes on two of the following:
    (i) Narcotics (ii) Allergy (iii) Heredity (iv) Human blood

  3. Give a brief of account of digestion in human body.

  4. What is the source of the heat used to maintain our body temperature constant?

  5. If a freshwater microorganism is placed in a strong salt solution, what will happen to it? Why? How might this effect of salt be used in preserving food?

  6. “Atherosclerosis” is a condition also called “hardening of the arteries”, resulting among other effects of reduced elasticity of the arteries. What circulatory problem might arise from this effect on the vessels.

  7. Describe the structure and function of any two of the following:
    (i) Dry Battery Cell (ii) Fire Extinguisher (iii) Clinical Thermometer (iv) Common electric bulb

  1. Describe the following:
    (i) Nitrogen cycle (ii) Photosynthesis (iii) Respiration (iv) Wheel and Axle

  2. Name the natural sources of the following acids:
    (i) Citric acid (ii) Acetic acid (iii) Lactic acid (iv) Formic acid

  3. What is the composition of the following alloys?
    (i) Stainless steel (ii) Brass (iii) Solder (iv) German Silver

  4. What is the difference Oils and Ghee? How the vegetable oil is converted into Banaspati Ghee?

  5. What is the corrosion and what are its disadvantages?

  6. What are the effects of waterlogging on plant growth?

  7. Explain why a bomber does not drop its bomb when it is vertically above the target?

  8. Why do we use woollen clothes for protecting ourselves from cold?

  9. What is the difference between a Telescope and Microscope?

  10. What is the difference between alternating current (A.C) and direct current (D.C.)? can you change the voltage of a D.C. source by using a transformer?

  11. Why do the bones show up better than flesh in an X-ray photograph?

  12. how are the planets different from the stars?

  13. What are the producers and consumers in an ecosystem?


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