Everyday Science Examination 1981

Time allowed: 2 hours
Maximum marks: 50

Note: Answer eleven questions in and to the point. All questions which carries 10 marks.

Fill in the blanks:

1. Malaria caused by ------------- (Plasmodium, mosquito, Trypanosome). 
2. Rickets disease is caused by a deficiency of ‘vitamin ----------- (C.D.E.). 
3. B. C. G. vaccination is prevention against ------------- (Typhoid, Tuberculosis, and Diphtheria). 
4. The smallest organism which causes disease is _________ (Protozoa, Bacteria, Virus).
5. Pakistan is supposed to be free from ________ disease.(poliomyelitis, Malaria, Small pox). 
6. If distant objects appear blurred due to defective sight, spectacles with __________ lenses are used (Convex, Concave Cylindrical). 
7. Who invented telescope ------------- (Thomas, Edison, Galileo, and Samuel Morse). 
8. Wires used in carrying electric current were made up of _______ (Iron, Zinc, and Copper). 
9. Human ear is divided into _________ parts (Two. Three, Four). 
10.  Image of an object is formed on ______ of the eye. (Corners, Retina, Optic nerve).

Write short notes on two of the following:

i) Narcotics (ii) Allergy (iii) Heredity (iv) Human blood.

1.     Give a brief account of digestion in human body.
2.     What is the source of the heat used to maintain our body temperature Constant.
3.     If a fresh water micro-organism is placed in a strong salt solution, what happen to it? Why? How might this effect of salt be used in preserving food?
4.     “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?
5.     Describe the Structure and function of any Iwo of the following:
   i) Dry Battery Cell. (ii) Fire Extinguisher Clinical (iii) Thermometer Common Electric Bulb.
6. Describe the following: i) Nitrogen cycle (ii) Photosynthesis (iii) Respiration (iv) Wheel and Axle.
7. Name the natural sources of the following acids:
   i) Citric acid (ii) Acetic acid (iii) Lactic acid (iv) Formic acid.
8. What is the composition of the following alloys:
   I) Stainless steel (ii) &ass (iii) Solder (iv) German Silver.
9. What is the difference between Oils and Ghee. How the vegetable converted into Vanaspati Ghee.
10. What is corrosion and what are its disadvantage.
11. What are the effects of waterlogging on plant growth.
12. Explain why a bomber does not drop its bomb when it is vertically a the target.
13. Why do we use woolen clothes for protecting ourselves from cold.
14. What is the difference between a Telescope and Microscope.
15. What is the difference between alternating current (AC) and direct c (DC). Can you change the voltage of a DC source by using a transformer.
16. Why do the bones show up better than flesh in an VX-ray photograph.
17. How are the planets different from the stars.
18. What are the producer and consumers in an eco-system.