Railways General Science & Technology Heat Sample Paper

done Heat Sample Test Paper-4 Total Questions - 20    [Download]

• question_answer1)
  A metal sheet with a circular hole is heated. The hole
  A)
   gets larger
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  B)
   gets smaller
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  C)
   Remains of the same size
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  D)
   Gets deformed
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• question_answer2)
  In a pressure cooker the cooking is fast, because
  A)
   The boiling point of water is raised by the increased pressure inside the cooker
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  B)
   The boiling point of water is lowered by pressure
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  C)
   More steam is available to cook the food at \[100{}^\circ C\]
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  D)
   More pressure is available to cook the food at \[100{}^\circ C\]
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• question_answer3)
  Two blocks of ice when pressed together join to form a block because
  A)
   Of heat produced during pressing
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  B)
   Of cold produced during pressing
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  C)
   Melting point of ice decreases with increase of pressure
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  D)
   Melting point of ice increases with increase in pressure
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• question_answer4)
  Which of the following combinations of properties would be most desirable for a cooking pot?
  A)
   High specific heat and low conductivity
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  B)
   Low specific heat and high conductivity
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  C)
   High specific heat and high conductivity
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  D)
   Low specific heat and low conductivity
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• question_answer5)
  It is difficult to cook at high altitude, because
  A)
   There is less oxygen in the air
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  B)
   Due to fall in temperature, one has to give more heat
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  C)
   Due to decrease in atmospheric pressure, the boiling point of water decreases
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  D)
   Of high moisture content at higher altitudes
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• question_answer6)
  Cryogenic engines find applications in
  A)
   Rocket technology
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  B)
   Frost-free refrigerators
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  C)
   Sub-marine propulsion
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  D)
   Researches in superconductivity
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• question_answer7)
  A thermometer for measuring very low temperature is called
  A)
   Cryometer
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  B)
   Bolometer
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  C)
   Pyrometer
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  D)
   Platinum resistance thermometer
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• question_answer8)
  Brick walls are used in the construction of a cold storage because
  A)
   Brick is a bad conductor
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  B)
   It is cheaper
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  C)
   It is easier to construct
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  D)
   None of these
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• question_answer9)
  When the door of a refrigerator in a room is kept open, the temperature of the room
  A)
   Decreases         
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  B)
   neither [a] nor [b]
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  C)
   Increases          
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  D)
   cannot say
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• question_answer10)
  A closed bottle containing water \[(at\,\,30{}^\circ C)\] is carried in a spaceship and placed on the surface of the moon. What will happen to the water when the bottle is opened?
  A)
   Nothing will happen to it
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  B)
   Water will freeze
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  C)
   Water will boil
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  D)
   It will decompose into \[{{H}_{2}}\] and \[{{O}_{2}}\]
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• question_answer11)
  Water in an earthen pot cools below the room temperature due to
  A)
   Absence of radiation
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  B)
   Evaporation of water from me surface of the pot
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  C)
   Insulation
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  D)
   Absence of convection
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• question_answer12)
  Two thin blankets are warmer than a single one of the same thickness because
  A)
   The air layer trapped in between the two blankets is a bad conductor
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  B)
   The distance of heat transmission is increased
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  C)
   The total mass of the blankets will be more
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  D)
   None of these
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• question_answer13)
  Heat from the sun is received by the earth through
  A)
   Radiation         
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  B)
   Convection
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  C)
   Conduction      
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  D)
   None of the above
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• question_answer14)
  'Green House effect' means
  A)
   Pollution in houses in tropical region
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  B)
   Trapping of solar energy due to atmospheric oxygen
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  C)
   Trapping of solar energy due to atmospheric carbon dioxide
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  D)
   None of the above
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• question_answer15)
  What is solar prominence?
  A)
   A relative cool area on the Sun's surface
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  B)
   A huge burst of fiery hydrogen gas from the Sun's photosphere
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  C)
   An active region of Sun spots
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  D)
   All of these
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• question_answer16)
  Water has maximum density at
  A)
   \[0{}^\circ C\]             
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  B)
   \[32{}^\circ F\]
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  C)
   \[-4{}^\circ C\]
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  D)
   \[4{}^\circ C\]
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• question_answer17)
  A beaker is completely filled with water at \[4{}^\circ C.\] It will overflow if
  A)
   Heated above \[4{}^\circ C\]
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  B)
   Cooled below \[4{}^\circ C\]
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  C)
   Both heated and cooled above and below \[4{}^\circ C\] respectively
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  D)
   None of the above
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• question_answer18)
  540 g of ice at \[0{}^\circ C\] is mixed with 540 g of water at \[80{}^\circ C.\] The final temperature of the mixture is
  A)
  \[0{}^\circ C\]              
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  B)
  \[40{}^\circ C\]
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  C)
   \[80{}^\circ C\]           
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  D)
   Less than \[0{}^\circ C\]
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• question_answer19)
  The sprinkling of water reduces slightly the temperature of a closed room because
  A)
   Temperature of water is less than that of the room
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  B)
   Specific heat of water is high
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  C)
   Water has large latent heat of vaporisation
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  D)
   Water is a bad conductor of heat
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• question_answer20)
  Water is used to cool radiators of engines, because
  A)
   Of its lower density        
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  B)
   It is easily available
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  C)
   It is cheap        
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  D)
          It has high specific heat
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