9th Class Science Force and laws of motion Question Bank

done Force And Laws Of Motion IIT JEE Objective Problems Total Questions - 11

• question_answer1)
                                                  A person is sitting in a travelling train and facing the engine. He tosses up a coin and the coin falls behind him. It can be concluded that the train is
  A)
   Moving forward and gaining speed done clear
  B)
   Moving forward and losing speed done clear
  C)
   Moving forward with uniform speed done clear
  D)
   Moving backward with uniform done clear
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• question_answer2)
  A bullet of mass 0.1 kg ks fired with a speed of 100 m/s, the mass of gun 50 kg. The velocity of recoil is
  A)
   0.2 m/s                done clear
  B)
   0.1 m/s done clear
  C)
   0.5 m/s                                done clear
  D)
   0.05 m/s done clear
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• question_answer3)
  If a force of 250 N act on body, the momentum acquired is 125 kg m/s, what is the period for which force acts on the body?
  A)
   0.5s      done clear
  B)
   0.2s      done clear
  C)
   0.4s                                       done clear
  D)
   0.25s     done clear
  E)
  (e) \[\text{125}\times \text{25}0\text{s}\] done clear
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• question_answer4)
  A vehicle of 100 kg is moving with a velocity of 5m/ s. To stop it in 1/10 s, the required force in opposite direction is :
  A)
   5000 N                 done clear
  B)
   500 N done clear
  C)
   50 N                                      done clear
  D)
   1000 N done clear
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• question_answer5)
  A ship of mass \[\text{3}\times \text{1}{{0}^{\text{7}}}\] kg, initially at rest, is pulled by a force of \[\text{5}\times \text{1}{{0}^{\text{4}}}\] through a distance of 3m. Assuming that the resistance due to water is negligible, the speed of the ship is :
  A)
   1.5 m/s                                done clear
  B)
   60 m/s done clear
  C)
   0.1 m/s                done clear
  D)
   5 m/s done clear
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• question_answer6)
  A block of metal weighting 2 kg is resting on frictionless plane. It is struck by a jet releasing water at a rate struck by a jet releasing water at a rate of 1 kg/s and at a speed of 5 m/s. The initial acceleration of the block is :
  A)
   \[\text{2}.\text{5 m}{{\text{s}}^{\text{2}}}\]     done clear
  B)
   \[\text{5m}/{{\text{s}}^{\text{2}}}\] done clear
  C)
   \[\text{1}0\text{ m}/{{\text{s}}^{\text{2}}}\]                    done clear
  D)
  \[\text{5 m}/{{\text{s}}^{\text{2}}}\] done clear
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• question_answer7)
  The average force that is necessary to stop a hammer with a momentum of 25 Ns in 0.05 s, is about
  A)
   500 N    done clear
  B)
   125 N done clear
  C)
   50 N                      done clear
  D)
   25 N done clear
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• question_answer8)
  A ball of mass 100 g is moving with a velocity of 10 m/s and hits a bat and rebounds with a velocity of 10 m/s. The force of the blow by the bat acts for 0.01 s. The average force exerted on the ball b the bat is
  A)
   50 N                      done clear
  B)
   100 N done clear
  C)
   200 N                    done clear
  D)
   zero done clear
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• question_answer9)
  A vehicle of mass 120 kg is moving with a uniform velocity of 108 km/h. The force required to stop the vehicle in 10s is :
  A)
   \[\text{12}0\times \text{l}0.\text{8}\,\text{N}\]              done clear
  B)
   180 N done clear
  C)
   720                                        done clear
  D)
   360 N done clear
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• question_answer10)
  A body of mass 2 kg collides with a wall with speed 100 m/s and rebounds with the same speed. If the time of contact was 1/50 s, the force exerted on the wall is:
  A)
   8 N                        done clear
  B)
   \[\text{2}\times \text{1}{{0}^{\text{4}}}\text{ N}\] done clear
  C)
   4 N                                        done clear
  D)
   \[{{10}^{4}}\,N\] done clear
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• question_answer11)
  In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gas ejected from the rocket is \[\text{5}\times \text{1}{{0}^{\text{4}}}\] m/s. The thrust on the rocket is
  A)
   \[2\times {{10}^{3}}N\]                                done clear
  B)
   \[5\times {{10}^{4}}N\] done clear
  C)
   \[2\times {{10}^{6}}N\]                done clear
  D)
   \[2\times {{10}^{8}}N\] done clear
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