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  1. Science II (March 1999)

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   Science II (March 1999)

SELECTION MENU

  
 
 
SCIENCE - II
 
Time: 2 1/2 Hours
MARCH - 1999
Marks: 60
Q.1 A) Fill in the blanks and rewrite the complete statements:
3
1) Bleaching action of sulphur dioxide is due to ------- reaction.
2) A chance of increasing blood pressure is more if more -------- is consumed in daily diet by adults.
3) Benzene hydrocarbon have --------- chain.
 
B) Select the proper words from Group 'B' for the items in Group 'A' and rewrite the pairs:
3
 
Group 'A' Group 'B'
1) Deficiency of iron a) Chemical refrigerant
2) Freon b) Pellagra
3) Chemical reaction c) Anaemia
  d) Rancidity in groundnut
 
C) Considering the relation between the groups of words from the first pair, write the correct word to match the third word:
       Cu2O : Cuprite : : Cu2S : ----------
1
 
D) Select the odd man out:
      Banana, Sapota, Orange, Grapes
 
E) Write whether the following statements are True or false. If false rewrite the corrected statement.
2
1) Amount of food is wasted in social functions due to improper management.
2) H2S gas collected by downward displacement of water.
 
Q.2 A) Answer the following in brief (any three):
6
1) Write any four hazards of malnutrition in human beings.
2) Write a short note on 'Acid Rains'.
3) Name the hormone secreted by the thyroid gland. Write down three effects due to excess secretion.
4) Explain the procedure of composting.
 
B) Attempt any Two of the following:
4
1) Draw a neat diagram of cold flame and label the following parts:
a) Cold flame; b) Yellow phosphorus.
2) Construct a food chain with the help of the following organisms:Snake, Grasshopper, Grass, Frog.
3) Draw a neat diagram showing the preparation of Hydrogen Sulphide in laboratory and label the following parts:
a) Iron Sulphide and 'dil HCI'. B) H2S gas
 
Q.3 A) Give the scientific reasons for any Three of the following:
6
1) Continuous loud noise is not desirable.
2) Oxygen is called as life supporting gas.
3) Glucose is used by players.
4) Excessive intake of food calories should be avoided.
5) Baking powder is used in the preparation of bread.
 
B) How is carbon dioxide prepared in the laboratory with the following points?
1) Name the chemical used.
½
2) Neat and labelled diagram.
2
3) Balanced chemical equation.
1
4) Method of collecting the gas.
½
 
Q.4 A) Explain the following chemical reactions with the help of balanced equations (any three)
6
1) Yellow phosphorus is exposed to air at room temperature.
2) Fermentation of glucose solution.
3) Silver is heated with conc. H2SO4.
4) Action of magnesium and dilute Hydrochloric acid.
 
B) Distinguish between the following pairs giving two points each (any two):
4
1) Photosynthesis and Respiration;
2) Aliphatic Hydrocarbons and Aromatic Hydrocarbons;
3) Metals and Non-metals.
 
Q.5 A) Explain what will happen in the following cases (any three):
6
1) If the number of frogs becomes less in nature.
2) If the food is cooked in open pan and the excess water is thrown away.
3) If the wastes are not degraded.
4) If the food is not handled properly.
 
B) Explain the working of the blast furnace in extraction of iron with equations. (Diagram is not necessary)
4
 
Q.6 A) Answer any three of the following:
6
1) Energy flow is unidirectional. Explain.
2) Write the scientific name and the formula of 'Alum'.
3) Enlist the carcinogenic factors causing cancer.
4) Explain the vulcanisation of rubber.
 
B) Attempt any one of the following:
4
1) A food plate contains the following items. State the nutrients obtained from each of them:
i) Spinach; ii) Ghee; iii) Lemon; iv) Rice and bread.
2) Describe 'AIDS' with the following points:
i) Write the full form of 'AIDS'; ii) Name of virus;
iii) Spreading; iv) Prevention.
 


 

   Science II (October 1999)

SELECTION MENU

  
 
 
SCIENCE – II
 
Time: 2 ½ Hrs.
OCTOBER – 1999
Marks: 60
Q. 1. A) Complete the following statements by selecting appropriate alternatives given below each statement and rewrite the completed statements in your answer book:
3
    i) A hormone, namely ----- controls the level of glucose in the blood.
a) Fluorine; b) Iodine; c) Insulin; d) Sodium.
    ii) Ethylene undergoes reaction with itself. This is called as -----.
a) Oxidation; b) Substitution; c) Polymerisation; d) Halogenation.
    iii) Atomic number of Copper is ------.
a) 1;   b) 2;    c) 17;    d) 29.
     
  B) Match suitable pairs from those given in the Column ‘A’ and column ‘B’ and rewrite in your answer book:
 
Column ‘A’ Column ‘B’
i)  Vitamin A 1) Antioxidant
ii) Vitamin E 2) Rice plate
iii) Aerosol 3) Scurvy
iv) Faulty serving method 4) Freon
  5) Night-blindness
  6) Chloral
4
     
  C) State whether the following statements are True of False, if false, correct and rewrite the corrected statements:
3
    i) Alcohol affects the respiratory system.
    ii) Haemophilia is a hereditary disease.
    iii) AIDS can be controlled by Immunisation.
     
Q. 2. A) Answer the following questions briefly (Any Three):
6
    i) What is Arteriosclerosis? Write any two diseases caused by it.
    ii) Write four functions of Proteins.
    iii) Write any four causes of sound pollution.
    iv) Write any four faulty pre-marketing processes of cereal.
     
  B) Draw neat and labelled diagrams (ant Two):
4
    i) Cold flame;
    ii) Froth floatation process of concentration of ores;
    iii) Kipp’s apparatus.
     
Q. 3. A) Write scientific reasons for nay three of the following:
6
    i) Addictives are harmful to human beings.
    ii) All ores are minerals but all minerals are not ores.
    iii) The existence of life on the earth depends on the sun.
    iv) Carbon atoms are capable of forming an almost unlimited number
of compounds.
    v) Automobile vehicles should be checked periodically.
     
  B) Write the names of aluminum alloys and their constituent elements.
4
Q.4. A) Explain the following chemical reactions with the help of balanced chemical equations (any three):
6
    i) Fermentation reaction of glucose solution.
    ii) A burning magnesium wire is inserted in a gas jar of sulphur dioxide.
    iii) Limestone is heated upto 1000°C.
    iv) Yellow phosphorus is exposed to air at room temperature.
  b) Distinguish between the following pairs giving two points each
(any two):
4
    i) Nitrification and dentrification;
    ii) Abiotic components and biotic components;
    iii) Kwashiorkor and marasmus.
       
Q.5. A) Answer any three of the following:
6
    i) Write any two symptoms of diabetes.
    ii) Writs any four uses of ammonia.
    iii) Writs four effects of throwing all sorts of wastes in a haphazard manner.
    iv) Describe oxygen cycle.
  B) On the basis of preparation of carbon dioxide gas in a laboratory, answer the following questions:
4
    i) Name the chemicals used to prepare carbon dioxide.
    ii) Write the balanced chemical equation of the reaction.
    iii) Write the method of collecting the gas.
    iv) What will happen if this gas is passed through lime water for a short time?
     
Q.6. A) Answer any three of the following:
6
    i) Which are the natural preservatives used at household level?
    ii) "vehicle drivers are tested for colour blindness before issuing driving license"explain.
    iii) "It is beneficial to use compost fertilisers then chemical fertilisers for agriculture".explain.
    iv) The following example is a part of the food chain :
      Frog snake hawk.
      If the snake population declines,what will happen to:
    i) Population of frog?
    ii) Population of hawk?
     
  B) Answer any one of the following:
4
    i) A food plate contains the following items.state the main nutrients obtained from each of them:
      Methi Vegetable ,Moth beans,Dal, Lemon ,Rice, Salt.
      State the names of two food substances used during fast which are rich in carbohydrates.
    ii) Write down the effects of heat on sulphur at different temperatures.
 


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