Railways General Science & Technology Man Made Materials Sample Paper

done Man-Made Materials-I Sample Test Paper-23 Total Questions - 20    [Download]

• question_answer1)
  If glass is cooled suddenly it becomes
  A)
   Transparent      
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  B)
   soft
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  C)
   Malleable         
  done clear
  D)
   brittle
  done clear
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• question_answer2)
  Annealing of glass is done to
  A)
   make it brittle
  done clear
  B)
   make it opaque
  done clear
  C)
   Make it transparent
  done clear
  D)
   none of these
  done clear
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• question_answer3)
  Ordinary glass is
  A)
   Sodium silicate
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  B)
   Borosilicate
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  C)
   Sodium and calcium silicate
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  D)
   None of the above
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• question_answer4)
  The principal constituent of Pyrex glass is
  A)
   Zn                   
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  B)
   B
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  C)
   Pb                  
  done clear
  D)
   CI
  done clear
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• question_answer5)
  Glass is soluble in
  A)
   HF                  
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  B)
   \[{{H}_{2}}S{{O}_{4}}\]
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  C)
   \[HCI{{O}_{4}}\]        
  done clear
  D)
   Aqua regia
  done clear
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• question_answer6)
  Which variety of glass is used for the manufacture of optical lenses?
  A)
   Sodium glass    
  done clear
  B)
   Quartz
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  C)
   Flint glass         
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  D)
   Ground glass
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• question_answer7)
  Silica glass is
  A)
   A glass has high coefficient of expansion
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  B)
   Break?s up to red hot
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  C)
   Pure \[Si{{O}_{2}}\]
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  D)
   Very hard
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• question_answer8)
  Which one of the following is incorrect about flint glass?
  A)
   It is soft and transparent
  done clear
  B)
   Its refractive index is very high
  done clear
  C)
   It is \[{{K}_{2}}O.PbO.6Si{{O}_{2}}\]
  done clear
  D)
   It does not breaks on red hot
  done clear
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• question_answer9)
  Which one of the following type of glass has a layer of plastic?
  A)
   Safety glass
  done clear
  B)
   Ground glass
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  C)
   Reinforced glass
  done clear
  D)
   Borosilicate glass
  done clear
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• question_answer10)
  Percentage of silica
  A)
   Increases brittleness of glass
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  B)
   Decrease resistivity of glass
  done clear
  C)
   Both [a] and [b]
  done clear
  D)
   None of the above
  done clear
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• question_answer11)
  Mortar is a mixture of
  A)
   Cement + sand + water
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  B)
   Sand + iron
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  C)
   Cement + sand + iron
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  D)
   None of these
  done clear
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• question_answer12)
  Which one among the following is the chemical formula of gypsum, which is an ingredient of cement?
  A)
   \[C{{a}_{2}}Si{{O}_{4}}\]     
  done clear
  B)
   \[CaS{{O}_{4}}.2{{H}_{2}}O\]
  done clear
  C)
   \[CaO\]
  done clear
  D)
   \[CaS{{O}_{4}}.3{{H}_{2}}O\]
  done clear
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• question_answer13)
  Gypsum is added to clinker during cement manufacturing to
  A)
   Decrease the rate of setting of cement
  done clear
  B)
   Bind the particle of calcium silicate
  done clear
  C)
   Facilitate the formation of colloidal gel
  done clear
  D)
   Impact strength to cement
  done clear
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• question_answer14)
  Match Column I (Type of glass) with Column II (Composition) and select the correct answer using the codes given below the columns.

  	Column I		Column II
  A.	Soda glass	1.	Mixture of potassium and lead silicates
  B.	Crown glass	2.	Mixture of sodium, barium, zinc and magnesium silicates
  C.	Flint glass	3.	Mixture of sodium, zinc and magnesium silicates
  D.	Pyrex glass	4.	Mixture of sodium and calcium silicates

  Codes:
  A)
   A-4, B-1, C-2, D-3
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  B)
   A-3, B-2, C-1, D-4
  done clear
  C)
   A-4, B-2, C-1, D-3
  done clear
  D)
   A-3, B-1, C-2, D-4
  done clear
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• question_answer15)
  Which one of the following types of glass can cut-off ultraviolet rays?
  A)
   Soda glass       
  done clear
  B)
   Pyrex glass
  done clear
  C)
   Jena glass        
  done clear
  D)
   crooked glass
  done clear
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• question_answer16)
  A major constituent of cement besides lime is
  A)
   Silica   
  done clear
  B)
          alumina
  done clear
  C)
   Iron oxide        
  done clear
  D)
   magnesia
  done clear
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• question_answer17)
  Portland cement is manufactured by using
  A)
   Limestone, clay and stone
  done clear
  B)
   Limestone, gypsum and sand
  done clear
  C)
   Limestone, gypsum and alumina
  done clear
  D)
   Limestone, clay and gypsum
  done clear
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• question_answer18)
  After casting of cement on the wall water is given regularly; up to several days because
  A)
   Setting of cement is exothermic reaction therefore water! Decreases the temperature
  done clear
  B)
   Water absorb the heat from air and supplies to cement; for setting
  done clear
  C)
   Water helps in complete hydrolysis and setting of cement
  done clear
  D)
   All of the above
  done clear
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• question_answer19)
  The cement is usually called Portland cement because
  A)
   It can be easily ported
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  B)
   It is usually prepared near the ports
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  C)
   When mixed with water it becomes hard like Portland rocks
  done clear
  D)
   None of the above
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• question_answer20)
  Which is correct about cement?
  A)
   Gypsum is added to regulate setting time of cement
  done clear
  B)
   White cement does not contains iron
  done clear
  C)
   Lime is main constituent of cement
  done clear
  D)
   All of the above are correct
  done clear
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