9th Class Science Time and Motion Question Bank

done Case Based MCQs - Motion Total Questions - 25

• question_answer1)

  Read the following and answer questions from [1] to [5].

  The distance travelled by a body is the actual length of the path covered by it, irrespective of the direction in which body travels. It is a scalar quantity.

  The displacement of a body is the change in the position of the object when it moves from a given position to another position. It is equal to the length of the shortest path measured in the direction from the initial position to the final position of the object. It is a vector quantity.

  In the figure given below,

  In moving from C to B, two paths are possible, CAB and CB, where, CAB is the distance covered and CB is the displacement of object.

  Choose the correct statement.
  A)
  The displacement can be greater than distance when the path of motion is circular. done clear
  B)
  The displacement can never be greater than distance. It can either be less than or equal to distance. done clear
  C)
  The displacement can be greater than distance when the path of motion is parabolic. done clear
  D)
  The displacement of an object is always equal to the distance travelled by it. done clear
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• question_answer2)
  Displacement of a body can be
  A)
  positive                                      done clear
  B)
  negative done clear
  C)
  zero                                           done clear
  D)
  AII of these done clear
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• question_answer3)
  The velocity versus time graph of a body in motion is shown below. The displacement of the body will be
  A)
  20 m                                         done clear
  B)
  60 m done clear
  C)
  80 m             done clear
  D)
  110 m done clear
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• question_answer4)
  A particle starting from origin, moves 3 m North, 4 m East, 5 m South and then returns back to its initial position. Which of the following figures represents the path travelled by the particle?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer5)
  A body travels a distance of 15 m from A to B and then moves a distance of 20 m at right angle to AB. The displacement of the body will be
  A)
  15m                                          done clear
  B)
  25m done clear
  C)
  35m                                          done clear
  D)
  40m done clear
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• question_answer6)

  Read the following and answer the questions from [6] to [10].

  The distance travelled by a moving body is the actual length of the path covered by it, irrespective of the direction in which the body travels. It is a scalar quantity. Its SI unit is metre, e.g. consider the motion of an object moving along a straight path.

  Speed of an object is defined as the distance travelled by it per unit time.

  Speed of an obiect\[(v)=\frac{Distance\ (s)}{Time\ (t)}\]

  Speed is a scalar quantity. The SI unit of speed is metre per second (m/s). The distance travelled by an object is either positive or zero, so the speed may be positive or zero but never negative.

  Distance travelled by a train and time taken by it is shown in the following table

  Time                                       Distance (in km) 10:00 am                                           0 10:30 am                                          25  10:40 am                                          28 11:00 am                                          40 11:15 am                                          42 11:30 am                                          50

  Which of the following graph correctly shows distance-time relationship for given data?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer7)
  At which time the train is travelling at its highest speed?
  A)
  10:00 - 10:30 done clear
  B)
  10:30 - 10:40 done clear
  C)
  10:40 - 11:00                             done clear
  D)
  11:15 - 11:30 done clear
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• question_answer8)
  What is the average speed of the train?
  A)
  33.33km/h      done clear
  B)
  3.33km/h done clear
  C)
  33.33m/s        done clear
  D)
  3.33m/s done clear
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• question_answer9)
  At what distance does the train slow down?
  A)
  Between 30 km and 32 km done clear
  B)
  Between 40 km and 42 km done clear
  C)
  Between 38 km and 40 km done clear
  D)
  Between 50 km and 52 km done clear
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• question_answer10)
  Find the speed of train between 10:40 AM to 11:00 AM.
  A)
  6km/h                                       done clear
  B)
  12km/h done clear
  C)
  20km/h                                      done clear
  D)
  36km/h done clear
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• question_answer11)

  Read the following and answer the questions from [11] to [15].

  A body is said to have a uniform motion, if it travels equal distances in equal intervals of time, no matter how small these intervals may be. The distance travelled by an object in uniform motion increases linearly.

  A train travels from one station to the next. The driver of train A starts from rest at time t = 0 and accelerates uniformly for the first 20 s. At time t = 20 s, train reaches its top speed of 25 m/s, then travels at this speed for further 30 s before decelerating uniformly to rest. Total time for the journey of train A is 60 s.

  Another train B is travelling in the parallel of train A with zero initial speed at t = 0 and then accelerates uniformly for first 10 s.

  At time t = 10 s it reaches its top speed of 30 m/s, then travels at this speed for further 20 s before decelerating uniformly to rest Total time for the journey of train B is 80 s.

  The correct speed-time graph for the motion of train A is
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer12)
  Calculate the deceleration of train A, as it comes to rest
  A)
  \[25 m/{{s}^{2}}\]               done clear
  B)
  \[0.25 m/{{s}^{2}}\] done clear
  C)
  \[2.5 m/{{s}^{2}}\]               done clear
  D)
  \[1 m/{{s}^{2}}\] done clear
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• question_answer13)
  In which time interval, speed of train B is constant?
  A)
  0-10 s                                        done clear
  B)
  10 s-20 s done clear
  C)
  10 s-30 s         done clear
  D)
  30 s-80 s done clear
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• question_answer14)
  What is the initial speed of trains A and B?
  A)
  zero                                           done clear
  B)
  \[1m{{s}^{-1}},1m{{s}^{-1}}\] done clear
  C)
  \[1m{{s}^{-1}},2m{{s}^{-1}}\]    done clear
  D)
  \[2m{{s}^{-1}},1m{{s}^{-1}}\] done clear
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• question_answer15)
  What is the numerical ratio of average velocity to average speed of an object when it is moving along a straight path?
  A)
  2:1                done clear
  B)
  1:2 done clear
  C)
  2:3                                            done clear
  D)
  1:1 done clear
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• question_answer16)

  Read the following and answer the questions from [16] to [20].

  Any change in the velocity of an object results in an acceleration by increasing speed, decreasing speed or changing direction. Yes, that's right, a change in the direction of motion results in an acceleration even if the moving object neither speed up nor slowed down. That's because acceleration depends on the change in velocity and velocity is a vector quantity; one with both magnitude and direction.

  Thus, a falling apple accelerates, a car stopping at a traffic light accelerates and the moon in orbit around the Earth accelerates.

  Hence, acceleration occurs anytime an object's speed increases or decreases, or it changes direction.

  Acceleration can be defined as rate of change of which quantity?
  A)
  Displacement done clear
  B)
  Velocity done clear
  C)
  Momentum                                done clear
  D)
  Inertia done clear
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• question_answer17)
  Acceleration is a vector quantity. I indicates that its value can be  
  A)
  positive, negative or zero done clear
  B)
  always positive done clear
  C)
  always negative done clear
  D)
  zero done clear
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• question_answer18)
  A falling apple accelerates. Which of the following is correct about its motion?
  A)
  Negative and uniform done clear
  B)
  Positive and uniform done clear
  C)
  Positive and non-uniform done clear
  D)
  Negative and non-uniform done clear
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• question_answer19)
  Which of the following is most likely not a case of uniform circular motion?
  A)
  Motion of the earth around the sun done clear
  B)
  Motion of a toy train on a circular track done clear
  C)
  Motion of a racing car on a circular track done clear
  D)
  Motion of hour's hand on the dial of clock done clear
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• question_answer20)
  A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. The acceleration is
  A)
  \[5m{{s}^{-2}}\]   done clear
  B)
  \[1km{{s}^{-2}}\] done clear
  C)
  \[216m{{s}^{-2}}\]       done clear
  D)
  \[216km{{h}^{-2}}\] done clear
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• question_answer21)

  Read the following and answer the questions from [21] to [25].

  If an object moves in a circular path with uniform speed, then its motion is called uniform circular motion.

  When an object moves along a circular path, its direction of motion keeps changing continuously. The velocity changes due to continuous change in direction and thus motion along a circular path is said to be accelerated.

  When a body takes one round of a circular path, then it travels a distance equal to its circumference which is 271 r, where r is the radius of the circular path.

  Then, speed of the body moving in a circular path, \[v=2\pi r/t\], where t is the time taken for one round of circular path and n is constant having value 22/7.

  An insect moves along a circular path of radius 10 cm with a constant speed. It takes 1 min to move from a point on the path to the diametrically opposite point.

  The distance covered by the insect in reaching the diametrically opposite point is
  A)
  3.14 cm         done clear
  B)
  31.4 cm done clear
  C)
  314 cm          done clear
  D)
  0.314 cm done clear
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• question_answer22)
  The displacement covered in reaching B from A is
  A)
  10 cm                                       done clear
  B)
  5 cm done clear
  C)
  20 cm           done clear
  D)
  zero done clear
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• question_answer23)
  The speed acquired by the insect in moving the track from A to B is
  A)
  3.14 cm/min                              done clear
  B)
  31.4 cm/min done clear
  C)
  314 cm/min                               done clear
  D)
  0.314 cm/min done clear
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• question_answer24)
  What is the average velocity of insect in moving from A to B?
  A)
  10 cm/min       done clear
  B)
  20 cm/min done clear
  C)
  30 cm/min       done clear
  D)
  zero done clear
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• question_answer25)
  For a particle performing a uniform circular motion, the acceleration is
  A)
  constant in direction done clear
  B)
  constant in magnitude and direction done clear
  C)
  constant in magnitude but not in direction done clear
  D)
  constant in neither magnitude nor in direction done clear
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