9th Class Science Force and laws of motion Question Bank

done Force and Motion Total Questions - 40

• question_answer1)
  What is the S. I. unit of acceleration?
  A)
  \[m/min\]           done clear
  B)
         \[m/g\] done clear
  C)
  \[m/s\]   done clear
  D)
         \[m/{{s}^{2}}\] done clear
  E)
  None of these done clear
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• question_answer2)
  What would be the initial velocity of a body if it starts from rest?
  A)
  1                                  done clear
  B)
  -1 done clear
  C)
  0                      done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer3)
  What would be the acceleration of a body if it moves with uniform velocity?
  A)
  0                      done clear
  B)
  1 done clear
  C)
  -1                     done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer4)
  What would be the final velocity of a body if it comes to the rest?
  A)
  0                      done clear
  B)
  1 done clear
  C)
  -1                     done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer5)
  What kind of motion it is if an athlete is moving on a circular track?
  A)
  Circular motion   done clear
  B)
  Rectilinear motion done clear
  C)
  Rotational motion           done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer6)
  The velocity time graph for a constant velocity is:
  A)
  Straight line done clear
  B)
  Curved line done clear
  C)
  Circular line        done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer7)
  The distance -time graph for uniform motion is a:
  A)
  Straight line done clear
  B)
  Curved line done clear
  C)
  Circular line        done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer8)
  A cyclist covers the distance of 6 km in 15 minutes. Find his speed?
  A)
  20 km/h             done clear
  B)
  22 km/h done clear
  C)
  24 km/h done clear
  D)
         28 km/h done clear
  E)
  None of these done clear
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• question_answer9)
  Speed of a car is 25 m/s. How long will it take to cover the distance of 90 km?
  A)
  1 hour   done clear
  B)
  2 hours done clear
  C)
  2 hours  done clear
  D)
         4 hours done clear
  E)
  None of these done clear
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• question_answer10)
  The rate of change of velocity per unit time is known as:
  A)
  Velocity             done clear
  B)
  Acceleration done clear
  C)
  Speed    done clear
  D)
         Motion done clear
  E)
  None of these done clear
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• question_answer11)
  Who gave the laws of motion?
  A)
  Ernst                 done clear
  B)
  Newton done clear
  C)
  Linnaeus                        done clear
  D)
  Schwartz done clear
  E)
  None of these done clear
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• question_answer12)
  What force would be needed to produce an acceleration of \[6m/{{s}^{2}}\] on a ball of mass 6 kg??
  A)
  1 N                               done clear
  B)
  36 N done clear
  C)
  12 N                 done clear
  D)
         360 N done clear
  E)
  None of these done clear
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• question_answer13)
  Which of the following actions a force can do?
  A)
  Can move a stationary object. done clear
  B)
  Can stop a moving object. done clear
  C)
  Can change the speed of a moving object. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer14)
  Which of the following is correct?
  A)
  Force = mass \[\times \] acceleration done clear
  B)
  Force = mass \[\times \] displacement done clear
  C)
  Force = mass \[\times \] distance done clear
  D)
  Force = mass \[\times \] speed done clear
  E)
  None of these done clear
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• question_answer15)
  A car weighing 1000 kg moving with a velocity of 40 m/s retards uniformly coming to rest in 10 s. Calculate the initial momentum of the car.
  A)
  48,000 kg m/s    done clear
  B)
  40,000 kg m/s done clear
  C)
  38,000 kg m/s done clear
  D)
         33,000 kg m/s done clear
  E)
  None of these done clear
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• question_answer16)
  Which one of the following is called first equation of motion?
  A)
  \[v=u+at\]        done clear
  B)
  \[\text{s=ut}\,\text{+}\,\frac{\text{1}}{\text{2}}\text{a}{{\text{t}}^{\text{2}}}\] done clear
  C)
  \[{{\text{v}}^{\text{2}}}\,\text{=}\,{{\text{u}}^{\text{2}}}\,\text{+}\,\text{2as}\]       done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer17)
  What is the acceleration produced by a force of 15 N exerted on an object of mass 5 kg?
  A)
  \[\text{1 m/ }{{\text{s}}^{\text{2}}}\]               done clear
  B)
  \[\text{2}\,\text{m/ }{{\text{s}}^{\text{2}}}\] done clear
  C)
  \[3\,m\,/{{s}^{2}}\]      done clear
  D)
         \[4\,m/{{s}^{2}}\] done clear
  E)
  None of these done clear
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• question_answer18)
  What force would be needed to produce an acceleration of \[6\text{ }m/{{s}^{2}}\] in a ball of mass 6 kg?
  A)
  12 N                             done clear
  B)
  24 N done clear
  C)
  36 N                 done clear
  D)
         48 N done clear
  E)
  None of these done clear
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• question_answer19)
  An object undergoes an acceleration of \[6\,m/{{s}^{2}}\]starting from rest. Find the distance travelled in one second.
  A)
  4 m                               done clear
  B)
  8 m done clear
  C)
  16 m     done clear
  D)
                     32 m done clear
  E)
  None of these done clear
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• question_answer20)
  What would be momentum of a body of mass 50 kg when it is moving with a uniform speed of 5 m/s?
  A)
  100 kg. m/s                    done clear
  B)
  150 kg. m/s done clear
  C)
  200 kg. m/s                    done clear
  D)
  250 kg. m/s done clear
  E)
  None of these done clear
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• question_answer21)
  If a body is moving with a uniform velocity, then acceleration is:
  A)
  Increases                        done clear
  B)
  Decreases done clear
  C)
  Zero                  done clear
  D)
         Negative done clear
  E)
  None of these done clear
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• question_answer22)
  A train is moving at a speed of 60 m/s at 10.00 a.m. and at 80 m/s at 10:02 a.m. Assuming that the train moves along a straight track and the acceleration is constant, the value of acceleration is:
  A)
  \[300\,m/{{s}^{2}}\]                done clear
  B)
  \[1/6\,m/{{s}^{2}}\] done clear
  C)
  \[40\,m/{{s}^{2}}\]      done clear
  D)
         \[6\,m/{{s}^{2}}\] done clear
  E)
  None of these done clear
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• question_answer23)
  The Velocity-time graph of an object moving in a fixed direction is shown in the given figure. The object:
  A)
  Is at rest done clear
  B)
  Moves with a uniform velocity. done clear
  C)
  Moves with a uniform speed. done clear
  D)
  Moves with a uniform acceleration. done clear
  E)
  None of these done clear
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• question_answer24)
  A bus has a uniform acceleration of \[3\,m/{{s}^{2}}\]. What distance will it cover in 10s after starting from rest?
  A)
  100 m               done clear
  B)
  150 m done clear
  C)
  500 m   done clear
  D)
         100 km done clear
  E)
  None of these done clear
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• question_answer25)
  A quantity has a value of\[-10.0\text{ }m/s\]. It may be the:
  A)
  Speed of a particle done clear
  B)
  Velocity of a particle done clear
  C)
  Acceleration of a particle done clear
  D)
  Position of a particle done clear
  E)
  None of these done clear
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• question_answer26)
  A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is:
  A)
  Accelerated done clear
  B)
  uniform done clear
  C)
  Retarded            done clear
  D)
         along circular tracks done clear
  E)
  None of these done clear
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• question_answer27)
  An object of mass 0.2 kg is kept at rest. A force of 3N acts on it for 5 s. Find the distance moved by a particle in 5 s.
  A)
  150 m               done clear
  B)
  187.5 m done clear
  C)
  100 m   done clear
  D)
         180 m done clear
  E)
  None of these done clear
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• question_answer28)
  The velocity-time graph of moving object is shown in the given figure. The object:
  A)
  Moves with a uniform speed. done clear
  B)
  Moves with a uniform velocity. done clear
  C)
  Moves with a non-uniform acceleration. done clear
  D)
  Is at rest done clear
  E)
  None of these done clear
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• question_answer29)
  Upward force exerted by the fluid on the partially immersed solid in that fluid is called:
  A)
  Pressure             done clear
  B)
  Buoyant force done clear
  C)
  Acceleration       done clear
  D)
         Momentum done clear
  E)
  None of these done clear
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• question_answer30)
  Unit of linear momentum is:
  A)
  Pascal               done clear
  B)
  \[m/{{s}^{2}}\] done clear
  C)
  \[kg/m\text{ }s\] done clear
  D)
         \[kg\,m{{s}^{-1}}\] done clear
  E)
  None of these done clear
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• question_answer31)
  A boy travelling in a car at a speed of 108 km/h. The brakes are applied so as to produce a uniform acceleration of \[-0.2\,m/{{s}^{2}}\]. Find how far does the car go before it is brought to rest?
  A)
  1050 m             done clear
  B)
  100 m done clear
  C)
  2250 m done clear
  D)
         2256 m done clear
  E)
  None of these done clear
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• question_answer32)
  A body (without air space) of mass 200 g and volume \[300\,c{{m}^{3}}\] is put in water. Will it float or sink? (Density of water is \[1\,g/\,c{{m}^{3}}\])
  A)
  Sink done clear
  B)
  Float done clear
  C)
  Either [a] or [b] done clear
  D)
  Cannot be determined done clear
  E)
  None of these done clear
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• question_answer33)
  A boy is wearing bracelet of mass 350 g. How much force is he exerting on the shoes?
  A)
  30 N                             done clear
  B)
  30.8 N done clear
  C)
  3.43 N   done clear
  D)
         38 done clear
  E)
  None of these done clear
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• question_answer34)
  In the given distance time graph which object is moving with uniform motion?
  A)
  Object P            done clear
  B)
  Object Q done clear
  C)
  Object R            done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer35)
  A wooden block of mass 1kg and volume \[1.7\times {{10}^{-3}}{{m}^{3}}\] is completely immersed in water. The buoyant force exerted by water on the wooden block is ____. Density of water is\[1000\,kg/{{m}^{3}}\].
  A)
  16 N                             done clear
  B)
  18 N done clear
  C)
  16.6 N   done clear
  D)
         21 N done clear
  E)
  None of these done clear
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• question_answer36)
  A force of 5 N on a body increases its velocity from 10 m/s to 15 m/s in 3 s. Find the mass of the body
  A)
  10 kg                             done clear
  B)
  13 kg done clear
  C)
  3 kg                  done clear
  D)
         12 kg done clear
  E)
  None of these done clear
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• question_answer37)
  A cyclist does not come to rest immediately after he stops pedalling due to:
  A)
  Buoyant force    done clear
  B)
  Inertia of motion done clear
  C)
  Drag force          done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer38)
  Which one of the following formula describes the impulse?
  A)
  Mass \[\times \] Acceleration done clear
  B)
  Force \[\times \] time done clear
  C)
  Force/Area done clear
  D)
  Change in velocity/time done clear
  E)
  None of these done clear
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• question_answer39)
  A water tanker filled up to 2/3 of its height is moving with a uniform speed On sudden application of the brake, the water in the tank would
  A)
  Move backward  done clear
  B)
  move forward done clear
  C)
  Be unaffected done clear
  D)
         rise upwards done clear
  E)
  None of these done clear
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• question_answer40)
  Two balls M and N of masses 3g and 6g are in motion with velocities 2m/s and 1 m/s respectively. Their momenta are in the ratio:
  A)
  2 : 1                              done clear
  B)
  1 : 2 done clear
  C)
  3 : 2                  done clear
  D)
         1 : 1 done clear
  E)
  None of these done clear
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