Railways General Science & Technology Mechanics Sample Paper

done Mechanics-II Sample Test Paper-2 Total Questions - 20    [Download]

• question_answer1)
  An artificial satellite orbiting the earth does not fall down because the earth's attraction
  A)
   Is balanced by the attraction of the moon
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  B)
   Vanishes at such distances
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  C)
   Is balanced by the viscous drag produced by the atmosphere
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  D)
   Produces the necessary acceleration of its motion in a curved path
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• question_answer2)
  All bodies whether large or small fall with the
  A)
   Same force      
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  B)
   same acceleration
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  C)
   Same velocity
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  D)
          same momentum
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• question_answer3)
  The weight of a body at the centre of the earth is
  A)
   Zero           
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  B)
   Infinite
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  C)
   Same as at other places
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  D)
   Slightly greater than that at poles
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• question_answer4)
  A boy is whirling a stone tied with a string in an horizontal circular path the string breaks, the stone
  A)
   Will continue to move in the circular path
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  B)
   Will move along a straight line towards the centre of the circular path
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  C)
   Will move along a straight line tangential to the circular path
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  D)
   Will move along a straight line perpendicular to the circular path away from the boy
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• question_answer5)
  The weight of an object is the
  A)
   Mass of the object
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  B)
   Force with which it is attracted towards the earth
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  C)
   Product of its mass and acceleration due to gravity
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  D)
   Only [b] and [c]
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• question_answer6)
  Potential energy of your body is minimum when you
  A)
   Are standing
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  B)
   Are sitting on a chair
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  C)
   Are sitting on the ground
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  D)
   Lie down on the ground
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• question_answer7)
  If a running boy jumps on a rotating table, which of the following is conserved.
  A)
   Linear momentum
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  B)
   K.E
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  C)
   Angular momentum
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  D)
   neither of above
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• question_answer8)
  An athlete runs some distance before taking a long jump because
  A)
   He gains energy to take him through long distance
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  B)
   It helps to apply large force
  done clear
  C)
   By running action and reaction force increases
  done clear
  D)
   By running the athlete gives himself larger inertia of motion
  done clear
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• question_answer9)
  A metal ball hits a wall and does not rebound whereas a rubber ball of the same mass on hitting the wall with the same velocity rebounds back. It can be concluded that
  A)
   Metal ball suffers greater change in momentum
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  B)
   Rubber ball suffers greater change in momentum
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  C)
   The initial momentum of metal ball is greater than initial momentum of rubber ball
  done clear
  D)
   Both suffer same change in momentum
  done clear
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• question_answer10)
  A boy carrying a box on his head is walking on a level road from one place to another on a straight road is doing no work. This statement is
  A)
   Correct
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  B)
   incorrect
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  C)
   Partly correct    
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  D)
   insufficient data
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• question_answer11)
  A man stands at one end of a boat which is stationary in water. Neglect water resistance. The man now moves to the other end of (he boat and again becomes stationary. The centre of mass of the 'man plus boat' system will remain stationary with respect to water
  A)
   In all cases
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  B)
   Only when the man is stationary initially and finally
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  C)
   Only if the man moves without acceleration on the boat
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  D)
   Only if the man and the boat have equal masses
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• question_answer12)
  To an astronaut in a space ship the sky appears black due to
  A)
   Absence of atmosphere in his neighbourhood
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  B)
   Light from the sky is absorbed by the medium surrounding him
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  C)
    The fact that at height, sky radiations are only in the infra-red and the ultraviolet region
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  D)
   None of the above
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• question_answer13)
  When an air bubble at the bottom of a lake rises to the top, it will
  A)
   Maintain its size
  done clear
  B)
   Decrease in size
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  C)
   Increase in size
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  D)
   Flatten into a dish like shape
  done clear
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• question_answer14)
  A chair is tilted about two of its legs and then left. It would return to its original position if
  A)
    It is tilted through an angle of \[60{}^\circ \]
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  B)
   It centre of gravity falls within the base.
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  C)
    Its centre of gravity falls outside the base.
  done clear
  D)
   It will never regain its original position.
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• question_answer15)
  'Black holes' refers to
  A)
   Collapsing object of high density
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  B)
   Bright spots on the sun
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  C)
   Holes occurring in heavenly bodies
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  D)
   Collapsing object of low density
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• question_answer16)
  Atmospheric pressure exerted on earth is due to the
  A)
   Gravitational pull
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  B)
          Revolution of earth
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  C)
   Rotation of earth           
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  D)
   Uneven heating of earth
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• question_answer17)
  If a toy boat in a tank sinks, the level of water will
  A)
   Fluctuate         
  done clear
  B)
   Decrease
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  C)
   Increase           
  done clear
  D)
   Remain the same
  done clear
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• question_answer18)
  If we go inside a mine and drop a 10 Ib iron ball and 1 Ib aluminium ball from the top of a high plat form
  A)
   Both will reach the floor at the same time
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  B)
   1 Ib weight will reach the floor first
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  C)
   10 Ib weight will reach the floor first
  done clear
  D)
   It is not possible to indicate which of the two will reach the floor first without further data
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• question_answer19)
  A man pushes a wall and fails to displace it. He does
  A)
   Positive but not maximum work
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  B)
   Negative work
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  C)
   Maximum work
  done clear
  D)
   No work at all
  done clear
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• question_answer20)
  If the earth losses its gravity then for a body
  A)
   Weight becomes zero but not the mass
  done clear
  B)
   Mass becomes zero but not the weight
  done clear
  C)
   Both mass and weight become zero
  done clear
  D)
   Neither mass nor weight become zero.
  done clear
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