9th Class Science Time and Motion Question Bank

done MCQs - Motion Total Questions - 45

• question_answer1)
  The numerical ratio of displacement and distance for a moving object is         (NCERT Exemplar)
  A)
  always less than 1  done clear
  B)
  always equal to 1 done clear
  C)
  always more than 1 done clear
  D)
  equal to or less than 1 done clear
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• question_answer2)
  In which of the following cases of motion, the distance moved and the magnitude of displacement are equal?
  A)
  If the car is moving on a straight road done clear
  B)
  If the car is moving on a circular road done clear
  C)
  If the pendulum is moving to and fro done clear
  D)
  If a planet is moving around the sun done clear
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• question_answer3)
  Magnitude of displacement is greater than the distance travelled by the object.
  A)
  True                                          done clear
  B)
  False done clear
  C)
  Can't say             done clear
  D)
  Partially true/false done clear
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• question_answer4)
  Odometer measures ......... covered by the vehicles.
  A)
  distance             done clear
  B)
  displacement done clear
  C)
  frame of reference done clear
  D)
  reference point done clear
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• question_answer5)
  If an object is moving with constant velocity, then the motion is
  A)
  speed                                        done clear
  B)
  uniform acceleration done clear
  C)
  uniform motion done clear
  D)
  non-uniform motion done clear
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• question_answer6)
  What does the path of an object look like when it is in a uniform motion?
  A)
  Straight done clear
  B)
  Curved done clear
  C)
  Zig-zag               done clear
  D)
  Circular done clear
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• question_answer7)
  The speed of a moving object is determined to be 0.06 m/s. This speed is equal to
  A)
  2.16 km/h           done clear
  B)
  1.08 km/h done clear
  C)
  0.216 km/h          done clear
  D)
  0.0216 km/h done clear
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• question_answer8)
  The ratio of magnitudes of average speed and average velocity, is
  A)
  always less than one done clear
  B)
  always equal to one done clear
  C)
  always more than one done clear
  D)
  equal to or more than one done clear
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• question_answer9)
  Speedometer is a device which is used to measure
  A)
  average speed done clear
  B)
  average acceleration done clear
  C)
  instantaneous speed done clear
  D)
  instantaneous acceleration done clear
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• question_answer10)
  A motorcar travels with a speed \[{{v}_{1}}\] from A to B and returns back from B to A with a speed \[{{v}_{2}}\]. The average speed of the car during its journey is
  A)
  \[\frac{{{V}_{1}}+{{V}_{2}}}{2}\]                  done clear
  B)
  \[\frac{{{V}_{1}}{{V}_{2}}}{{{V}_{1}}+{{V}_{2}}}\] done clear
  C)
   \[\frac{2{{V}_{1}}{{V}_{2}}}{{{V}_{1}}+{{V}_{2}}}\]            done clear
  D)
  \[\sqrt{{{V}_{1}}{{V}_{2}}}\] done clear
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• question_answer11)
  A bridge is 400 m long. A 150 m long train crosses the bridge at a speed of 50 m/s. Time taken by the train to cross it.
  A)
  5 s                done clear
  B)
  8 s done clear
  C)
  6 s                                            done clear
  D)
  11 s done clear
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• question_answer12)
  To specify the speed of an object, we  - require only .......
  A)
  magnitudes                                done clear
  B)
  direction done clear
  C)
  Both [a] and [b] done clear
  D)
  None of the above done clear
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• question_answer13)
  An object travels 24 m with a speed of 4 m/s and then another 32 m with speed of 8 m/s . The average speed of the object is
  A)
  6 m/s                done clear
  B)
  4 m/s done clear
  C)
  5.6m/s              done clear
  D)
  6.5m/s done clear
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• question_answer14)
  A particle moving in a straight line covers half the distance with speed of 3 m/s. The another half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s, respectively. The average speed of the particle during this motion is
  A)
  4.0 m/s            done clear
  B)
  5.0 m/s done clear
  C)
  5.5m/s            done clear
  D)
  4.8m/s done clear
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• question_answer15)
  A point object transverses half the distance with velocity \[{{v}_{0}}\]. The remaining part of the distance is covered with velocity \[{{v}_{1}}\] for the half of the time and with velocity \[{{v}_{2}}\] for the rest half. The average velocity of the object for the whole journey is
  A)
  \[2{{V}_{1}}\left( {{V}_{0}}+{{V}_{2}} \right)/\left( {{V}_{0}}+2{{V}_{1}}+2{{V}_{2}} \right)\] done clear
  B)
  \[2{{V}_{0}}\left( {{V}_{0}}+{{V}_{1}} \right)/\left( {{V}_{0}}+{{V}_{1}}+{{V}_{2}} \right)\] done clear
  C)
  \[2{{V}_{0}}\left( {{V}_{1}}+{{V}_{2}} \right)/\left( {{V}_{1}}+{{V}_{2}}+2{{V}_{0}} \right)\] done clear
  D)
  \[2{{V}_{2}}\left( {{V}_{0}}+{{V}_{1}} \right)/\left( {{V}_{1}}+2{{V}_{2}}+{{V}_{0}} \right)\] done clear
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• question_answer16)
  Rajeev went from Delhi to Chandigarh and returned to Delhi on his motorbike. The odometer of that read 4200 km at the start of trip and 4460 km at the end of his trip. If Rajeev took 4 h 20 min to complete his trip, then find the average velocity in km/h.
  A)
  zero                done clear
  B)
  60 km/h done clear
  C)
  6 km/h              done clear
  D)
  180 km/h done clear
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• question_answer17)
  If velocity of an object decreases with time, then it is called
  A)
  retardation                                 done clear
  B)
  de-acceleration done clear
  C)
  negative acceleration                   done clear
  D)
  All of the above done clear
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• question_answer18)
  A particle is travelling with a constant speed. This means
  A)
  its position remains constant as time passes done clear
  B)
  it covers equal distance in equal time intervals done clear
  C)
  its acceleration is zero done clear
  D)
  it does not change its direction of motion done clear
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• question_answer19)
  A particle cannot be accelerated if its...... is constant.
  A)
  Speed              done clear
  B)
  Velocity done clear
  C)
  Distance            done clear
  D)
  Displacement done clear
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• question_answer20)
  The acceleration of a car that speeds up from 12 m/s to 30 m/s in 15 s, is
  A)
  \[2.4\text{ }m/{{s}^{2}}\]           done clear
  B)
  \[1.2\text{ }m/{{s}^{2}}\] done clear
  C)
  \[2\text{ }m/{{s}^{2}}\]              done clear
  D)
  \[5.2\text{ }m/{{s}^{2}}\] done clear
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• question_answer21)
  If the displacement of an object is proportional to the square of time, then the object is moving with
  A)
  a uniform velocity done clear
  B)
  a uniform acceleration done clear
  C)
  increasing acceleration done clear
  D)
  decreasing acceleration done clear
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• question_answer22)
  A woman is wearing her seat belt, while driving at 60 km/h. She finds it necessary to slam on her brakes and slows uniformly to a stop in 1.6 s. What is the average acceleration experienced by her?
  A)
  \[-10.4\ m/{{s}^{2}}\]          done clear
  B)
  \[10.4\ m/{{s}^{2}}\] done clear
  C)
  \[1.04\ m/{{s}^{2}}\]          done clear
  D)
  \[-1.04\ m/{{s}^{2}}\] done clear
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• question_answer23)

  The position of a particle moving along the X-axis at certain times is given below
  t(s)	0	1	2	3
  x(m)	-2	0	6	16

  Which of the following describes the motion correctly?
  A)
  Uniform, accelerated done clear
  B)
  Uniform, decelerated done clear
  C)
  Non-uniform, accelerated done clear
  D)
  There is not enough data for generalisation. done clear
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• question_answer24)
  Match the Column I with Column II and choose appropriate option from the codes given below

  	Column I (Acceleration)		Column II (Example)
  (a)	In the direction of motion	1.	Motion of freely falling body
  (b)	Against the direction of motion	2.	Car moves through congested market
  (c)	Uniform	3.	Brakes applied to
  (d)	Non-uniform	4.	Train starts moving from a station

  Codes
  A)
  A-1,  B-2,  C-3,  D-4 done clear
  B)
  A-3,  B-2,  C-1,  D-4 done clear
  C)
  A-4,  B-3,  C-1,  D-2 done clear
  D)
  A-2,  B-4,  C-1,  D-3 done clear
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• question_answer25)
  Four cars A, B, C and D are moving on a levelled road. Their distance versus time graphs are shown in figure. Choose the correct statement.
  A)
  Car A is faster than car D done clear
  B)
  Car B is the slowest done clear
  C)
  Car D is faster than car C done clear
  D)
  Car C is the slowest done clear
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• question_answer26)
  The displacement-time graph for two particles A and B are straight line inclined at angles of \[30{}^\circ \] and \[60{}^\circ \] with the time axis. The ratio of velocities, \[{{v}_{A}}:{{v}_{B}}\] is
  A)
  1 : 2                  done clear
  B)
  1 :\[\sqrt{3}\] done clear
  C)
  \[\sqrt{3}\] : 1                            done clear
  D)
  1 : 3 done clear
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• question_answer27)
  Slope of a velocity-time graph gives           (NCERT Exemplar)
  A)
  the distance done clear
  B)
  the displacement done clear
  C)
  the acceleration done clear
  D)
  the speed done clear
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• question_answer28)
  The area under the velocity-time graph gives the value of ......... .
  A)
  distance                                     done clear
  B)
  displacement done clear
  C)
  acceleration                                done clear
  D)
  speed done clear
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• question_answer29)

  From the given v-t graph (see figure), it can be inferred that the object is      (NCERT Exemplar)

   
  A)
  in uniform motion done clear
  B)
  at rest done clear
  C)
  in non-uniform motion                 done clear
  D)
  moving with uniform acceleration done clear
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• question_answer30)

  The speed-time graph of an object moving in a fixed direction is shown in figure.

  The object

  A)
  is at rest      done clear
  B)
  moves with a constant speed done clear
  C)
  moves with a constant velocity done clear
  D)
  moves with a constant acceleration done clear
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• question_answer31)
  The velocity-time graph of an object thrown vertically up is
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer32)
  Velocity-time graph for a moving object is found to be curved line, then its acceleration is
  A)
  constant                                    done clear
  B)
  variable done clear
  C)
  zero                 done clear
  D)
  None of these done clear
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• question_answer33)
  Match the Column I with Column II and choose appropriate option from the codes given below              

  	Column I		Column II
  (a)	Uniform velocity	1.
  (b)	Uniform retardation	2.
  (c)	Uniform acceleration with initial velocity	3.
  (d)	Uniform acceleration at steady rate	4.

  Codes
  A)
  A-3,  B-4,  C-2,  D-1 done clear
  B)
  A-4,  B-3,  C-1,  D-2 done clear
  C)
  A-4,  B-1,  C-2,  D-3 done clear
  D)
  A-1,  B-2,  C-3,  D-4 done clear
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• question_answer34)
  A body moving with an initial velocity of 5 m/s accelerates at \[2 m/{{s}^{2}}\]. Its velocity after 10 s is
  A)
  20 m/s                                       done clear
  B)
  25 m/s done clear
  C)
  5 m/s              done clear
  D)
  22.5m/s done clear
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• question_answer35)
  A body is thrown vertically upward with velocity u, the greatest height h to which it will rise is   (NCERT Exemplar)
  A)
  u/g                                            done clear
  B)
  \[{{u}^{2}}\]/2g done clear
  C)
  \[{{u}^{2}}\]/g                        done clear
  D)
  u/2g done clear
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• question_answer36)
  A car retards uniformly at the rate of \[5 m/{{s}^{2}}\] and stops in 10 s. The initial velocity of car is
  A)
  10 m/s               done clear
  B)
  5 m/s done clear
  C)
  50 m/s              done clear
  D)
  25 m/s done clear
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• question_answer37)
  A body starting from rest and moving with a constant acceleration, covers a distance \[{{s}_{1}}\] in the 4th second and a distance \[{{s}_{2}}\] in the 6th second. The ratio \[\frac{{{s}_{1}}}{{{s}_{2}}}\] is
  A)
  \[\frac{2}{3}\]                           done clear
  B)
  \[\frac{4}{9}\] done clear
  C)
  \[\frac{6}{11}\]                          done clear
  D)
  \[\frac{7}{11}\] done clear
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• question_answer38)
  A train starting from rest attains a velocity of 90 km/h in 2 min, then the distance travelled by the train for attaining this velocity is
  A)
  1.5 km            done clear
  B)
  2 km done clear
  C)
  2.5 km            done clear
  D)
  1.2 km done clear
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• question_answer39)
  A ball is released from the top of a tower of height h metre. It takes T sec to reach the ground. What is the position of the ball in \[\frac{T}{3}\] sec?
  A)
  \[\frac{h}{9}\] m from the ground done clear
  B)
  \[\frac{7h}{9}\] m from the ground done clear
  C)
  \[\frac{8h}{9}\]m from the ground done clear
  D)
  \[\frac{17h}{18}\] m from the ground done clear
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• question_answer40)
  A particle is moving in a circular path of radius r. The displacement after half a circle would be    (NCERT Exemplar)
  A)
  zero                                           done clear
  B)
  \[\pi r\] done clear
  C)
  2r                                             done clear
  D)
  2\[\pi r\] done clear
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• question_answer41)
  A body performs uniform circular motion, then
  A)
  its velocity is constant done clear
  B)
  its speed is constant done clear
  C)
  an acceleration works towards centre done clear
  D)
  Both [b] and [c] done clear
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• question_answer42)
  The motion of blades of an electric fan around the axle is an example of
  A)
  uniform circular motion. done clear
  B)
  linear motion done clear
  C)
  uniform retarded motion done clear
  D)
  Non-uniform motion done clear
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• question_answer43)
  Suppose a boy is enjoying a ride on a merry-go-round which is moving with a constant speed of \[10\text{ }m{{s}^{-1}}\]It implies that the boy is         (NCERT Exemplar)
  A)
  at rest done clear
  B)
  moving with no acceleration done clear
  C)
  in accelerated motion done clear
  D)
  moving with uniform velocity done clear
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• question_answer44)
  The minute hand of a wall clock is 14 m long. The distance and displacement covered by the tip of minute hand from 9 : 00 am to 9 : 30 am, are
  A)
  88 cm, 28 cm done clear
  B)
  28 cm, 44 cm done clear
  C)
  28 cm, 88 cm done clear
  D)
  28 cm, 28 cm done clear
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• question_answer45)
  A boy moving along a circular path of radius 10 m completes 3/4th of the circle in 10 s. The magnitude of speed and velocity are
  A)
  4.71 m/s and 47.1 m/s done clear
  B)
  4.71 m/s and 1.41 m/s done clear
  C)
  1.41 m/s and 4.71 m/s done clear
  D)
  1.41 m/s and 1.41 m/s done clear
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