Railways Basic Science and Engineering Work, Energy And Power / कार्य, ऊर्जा एवं शक्ति Question Bank

done Work, Power, Energy Total Questions - 50

• question_answer1)
  In order to do work, energy is
  A)
  transferred or converted done clear
  B)
   used up done clear
  C)
   lost done clear
  D)
   lost or transferred done clear
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• question_answer2)
  Potential energy and kinetic energy are types of
  A)
   Electrical energy done clear
  B)
   Magnetic energy done clear
  C)
   Thermal energy  done clear
  D)
   Mechanical energy done clear
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• question_answer3)
  Pendulum bob stops moving when all its original gain in gravitational potential energy has been converted to
  A)
   Sound Energy    done clear
  B)
   Thermal Energy done clear
  C)
   Light Energy                  done clear
  D)
   Kinetic Energy done clear
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• question_answer4)
  Formula for gravitational potential energy is
  A)
  \[{{E}_{P}}=mg/h\], where m is mass, g is gravitational pull and is height done clear
  B)
  \[{{E}_{P}}=m/gh\], where m is mass, g is gravitational pull and is height done clear
  C)
  \[{{E}_{P}}=mgh\], where m is mass, g is gravitational pull and is height done clear
  D)
  \[{{E}_{P}}=gh/m\], where m is mass, g is gravitational pull and is height done clear
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• question_answer5)
  Power is defined as
  A)
   p = W/'t, where W is work and t is time done clear
  B)
   p = t/W, where t is time and W is work done clear
  C)
   p = W/'d, where W is work and d is distance done clear
  D)
   p = d/W, where d is distance and W is work done clear
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• question_answer6)
  Formula for efficiency is
  A)
   (energy input / energy output)\[\times \]100 done clear
  B)
   (energy input / energy output)\[\times \]100 done clear
  C)
   (useful energy input / energy output)\[\times \]100 done clear
  D)
   (useful energy output / total energy input)\[\times \]100 done clear
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• question_answer7)
  Food we eat contains
  A)
   Chemical Potential Energy done clear
  B)
   Elastic Potential Energy done clear
  C)
   Gravitational Potential Energy done clear
  D)
   Kinetic energy done clear
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• question_answer8)
  A constant force on an object given by product of force and distance moved by object in direction of force is termed as
  A)
   Work done                    done clear
  B)
   Efficiency done clear
  C)
   Power               done clear
  D)
   Energy done clear
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• question_answer9)
  Pendulum bob cannot attain its initial height because
  A)
   it continues to lose energy in thermal form done clear
  B)
   it continues to lose energy in sound form done clear
  C)
   it continues to lose energy in light form done clear
  D)
   it continues to lose energy in potential form done clear
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• question_answer10)
  Wind and waves are used by turbines to convert
  A)
   Mechanical Energy into Electrical Energy done clear
  B)
   Kinetic Energy into Electrical Energy done clear
  C)
   Potential energy into Kinetic Energy done clear
  D)
   Potential Energy into Electrical Energy done clear
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• question_answer11)
  Knocking a nail into a wooden block with a hammer involves conversion between different forms of energy, which of following choices present this conversion in correct order.
  A)
   chemical energy\[\to \]gravitational potential energy\[\to \]kinetic energy\[\to \](sound energy + heat energy) done clear
  B)
   chemical energy\[\to \]kinetic energy\[\to \]gravitational potential energy\[\to \](sound energy + heat energy) done clear
  C)
   chemical energy\[\to \](sound energy + heat energy)\[\to \]kinetic energy\[\to \]gravitational potential energy done clear
  D)
   (sound energy + heat energy)\[\to \]chemical energy\[\to \]kinetic energy\[\to \]gravitational potential energy done clear
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• question_answer12)
  An object of mass 'm' raised to a height '2h' above ground level possesses a gravitational potential energy of
  A)
   \[1/2\times mgh\]                       done clear
  B)
   mgh done clear
  C)
   2 mgh              done clear
  D)
   \[m\times g/2h\] done clear
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• question_answer13)
  A light and heavy body have equal momentam. Which one has greater kinetic energy?
  A)
   The light body done clear
  B)
   The heavy body done clear
  C)
   Both have same KE done clear
  D)
   None of these done clear
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• question_answer14)
  A car stopped screeching to avoid crash with a van, change is involved in process is
  A)
   Kinetic energy is converted into sound energy done clear
  B)
   Kinetic Energy is converted into sound and thermal energy done clear
  C)
   Potential energy is converted into sound, heat and kinetic energy done clear
  D)
   Kinetic and potential energy is converted into thermal and sound energy done clear
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• question_answer15)
  A compressed spring possesses
  A)
   Kinetic Energy done clear
  B)
   Elastic Potential Energy done clear
  C)
   Gravitational Potential Energy done clear
  D)
   Sound Energy done clear
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• question_answer16)
  If a bulb uses energy of 100 J and remains on for 25 s, power consumed by bulb will be
  A)
   125 W              done clear
  B)
   4 W done clear
  C)
   2500 W                        done clear
  D)
   75 W done clear
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• question_answer17)
  For two objects A and B, if mass of A is same as mass of B and speed of A is twice as much as that of B, statement that is correct is
  A)
   Kinetic energy of A= kinetic energy of B; because, kinetic energy is independent of speed of object. done clear
  B)
   Since kinetic energy is inversely proportional to speed of object, kinetic energy of A<kinetic energy of B done clear
  C)
   Kinetic energy of A = 1 D 4 \[\times \] Kinetic energy of B done clear
  D)
   Kinetic energy of \[A=4\times \]Kinetic energy of B done clear
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• question_answer18)
  When spring or rubber band is released it converts potential energy into
  A)
   Mechanical Energy         done clear
  B)
   Electrical Energy done clear
  C)
   Thermal energy  done clear
  D)
   Kinetic energy done clear
  View Solution play_arrow

• question_answer19)
  When an object is raised to a certain height above ground, it possesses
  A)
   Chemical Potential Energy done clear
  B)
   Elastic Potential Energy done clear
  C)
   Gravitational Potential Energy done clear
  D)
   Kinetic energy done clear
  View Solution play_arrow

• question_answer20)
  The work done on an object does not depend upon the
  A)
   Displacement done clear
  B)
   Force applied done clear
  C)
   Angle between force and displacement done clear
  D)
   Initial velocity of the object done clear
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• question_answer21)
  If the speed of an object is doubled then its kinetic energy is ___                  
  A)
   doubled                        done clear
  B)
   quadrupled done clear
  C)
   halved              done clear
  D)
   tripled done clear
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• question_answer22)
  The type of energy possessed by a simple pendulum, when it is at the mean position is
  A)
   kinetic energy done clear
  B)
   potential energy done clear
  C)
   potential energy + kinetic energy done clear
  D)
   sound energy done clear
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• question_answer23)
  Power Is a measure of the ____
  A)
   rate of change of momentum done clear
  B)
   force which produces motion done clear
  C)
   change of energy done clear
  D)
   rate of change of energy done clear
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• question_answer24)
  If air resistance is negligible, the sum total of potential and kinetic energies of a freely falling body____
  A)
   increases                       done clear
  B)
   decreases done clear
  C)
   becomes zero                 done clear
  D)
   remains the same done clear
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• question_answer25)
  In case of negative work, the angle between the force & displacement is:
  A)
   \[0{}^\circ \]                            done clear
  B)
   \[45{}^\circ \] done clear
  C)
   \[90{}^\circ \]                          done clear
  D)
   \[180{}^\circ \] done clear
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• question_answer26)
  The work done on an object does not depend on the:
  A)
   Displacement done clear
  B)
   Angle between force and displacement done clear
  C)
   Force applied done clear
  D)
   Initial velocity of the object done clear
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• question_answer27)
  Water stored in a dam possesses:
  A)
   No energy done clear
  B)
   Electrical energy done clear
  C)
   Kinetic energy done clear
  D)
   Potential energy done clear
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• question_answer28)
  A 1 kg block is lifted veritically 1 m by a boy. The work done by the boy is
  A)
   1J                                done clear
  B)
   0J done clear
  C)
   9.8 J                            done clear
  D)
   0.IJ done clear
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• question_answer29)
  During inter-con version of energy from one form to other forms, total energy at any time remains
  A)
   constant                       done clear
  B)
   zero done clear
  C)
   increasing                      done clear
  D)
   decreasing done clear
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• question_answer30)
  When we raised up a hammer, energy possessed is called
  A)
   kinetic energy    done clear
  B)
   chemical energy done clear
  C)
   nuclear energy   done clear
  D)
   potential energy done clear
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• question_answer31)
  Sunlight and water power are sources of energy which are
  A)
   renewable                     done clear
  B)
   very harmful done clear
  C)
   fossils               done clear
  D)
   destroyable done clear
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• question_answer32)
  A nuclear power plant uses energy released in nuclear reactor to generate electric power is called
  A)
   fission               done clear
  B)
   friction done clear
  C)
   hydrogen                      done clear
  D)
   mercury done clear
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• question_answer33)
  By burning large amount of fuel, we get
  A)
   petrol               done clear
  B)
   heat done clear
  C)
   sound               done clear
  D)
   chemicals done clear
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• question_answer34)
  If a body works at rate of 1 joule per second, then power of that body will be
  A)
   one watt                       done clear
  B)
   zero watt done clear
  C)
   half watt                       done clear
  D)
   two watts done clear
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• question_answer35)
  Solar energy can also be converted directly into electricity by
  A)
   solar cars                      done clear
  B)
   mercury done clear
  C)
   plasma             done clear
  D)
   solar cells done clear
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• question_answer36)
  An electric lamp produces
  A)
   light energy                   done clear
  B)
   heat energy done clear
  C)
   both A and B                done clear
  D)
   electrical energy done clear
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• question_answer37)
  If direction of motion of force is perpendicular to direction of motion of body, and then work done will be
  A)
   minimum                      done clear
  B)
   zero done clear
  C)
   maximum                     done clear
  D)
   none of above done clear
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• question_answer38)
  A nuclear reactor generates electricity by using
  A)
   thermal energy   done clear
  B)
   nuclear energy done clear
  C)
   mechanical energy         done clear
  D)
   chemical energy done clear
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• question_answer39)
  A system which gives an output equal to total energy used by it is called
  A)
   negative system done clear
  B)
   non-ideal system done clear
  C)
   ideal system                  done clear
  D)
   slow system done clear
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• question_answer40)
  Kinetic energy with mass 'm' and velocity 'v' is
  A)
   \[2\,\,m{{v}^{2}}\]                 done clear
  B)
   \[1/2\,\,mv\] done clear
  C)
   \[2mD{{v}^{2}}\]                   done clear
  D)
   \[1/2\,\,m{{v}^{2}}\] done clear
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• question_answer41)
  Ratio of required form of energy obtained from a system as output to total energy given to it as input is called it's
  A)
   efficiency                      done clear
  B)
   power done clear
  C)
   stress                done clear
  D)
   strain done clear
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• question_answer42)
  When a body vibrates, it produces
  A)
   sound   done clear
  B)
   water done clear
  C)
   heat                             done clear
  D)
   electricity done clear
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• question_answer43)
  Capacity of a body to do work is called
  A)
   energy  done clear
  B)
   workload done clear
  C)
   kinetic energy    done clear
  D)
   potential energy done clear
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• question_answer44)
  If some energy given to a system, then energy in required form obtained is always
  A)
   less than the given energy done clear
  B)
   equal to the given energy done clear
  C)
   greater than the given energy done clear
  D)
   none of above done clear
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• question_answer45)
  In process of rubbing hands, mechanical energy is converted into
  A)
   sound energy                 done clear
  B)
   electrical energy done clear
  C)
   thermal energy   done clear
  D)
   heat energy done clear
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• question_answer46)
  Work done will be zero if the angle between force and distance is
  A)
   \[30{}^\circ \]                          done clear
  B)
   \[90{}^\circ \] done clear
  C)
   \[180{}^\circ \]            done clear
  D)
   \[60{}^\circ \] done clear
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• question_answer47)
  Electric generators convert mechanical energy into
  A)
   light energy                   done clear
  B)
   sound energy done clear
  C)
   electrical energy done clear
  D)
   chemical energy done clear
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• question_answer48)
  If a box is pulled by a rope making an angle with surface then horizontal component of force is equal to
  A)
   F sine   done clear
  B)
   F cose done clear
  C)
   F tane              done clear
  D)
   None of above done clear
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• question_answer49)
  Energy can be converted into some other forms but cannot be
  A)
   destroyed          done clear
  B)
   decrease done clear
  C)
   increase                        done clear
  D)
   none of above done clear
  View Solution play_arrow

• question_answer50)
  Energy that causes water to evaporate from surface to form water vapors is known as
  A)
   electrical energy done clear
  B)
   thermal energy done clear
  C)
   chemical energy done clear
  D)
   heat energy done clear
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