Railways Basic Science and Engineering Time and Motion Question Bank

done Speed and Velocity Total Questions - 50

• question_answer1)
  Which of the following is a one dimensional motion?
  A)
   Landing of an aircraft done clear
  B)
   Earth revolving around the sun done clear
  C)
   Motion of wheels of a moving train done clear
  D)
   Train running on a straight track done clear
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• question_answer2)
  Which of the following can be zero, when a particle is in motion for some time?
  A)
   Distance                       done clear
  B)
   Displacement done clear
  C)
   Speed               done clear
  D)
   None of these done clear
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• question_answer3)
  Speed is in general ___ in magnitude than that of the velocity.
  A)
   equal                done clear
  B)
   greater or equal done clear
  C)
   smaller             done clear
  D)
   none of these done clear
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• question_answer4)
  Area under velocity-time curve over a given interval of time represents
  A)
   acceleration                   done clear
  B)
   momentum done clear
  C)
   velocity            done clear
  D)
   displacement done clear
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• question_answer5)
  The slope of velocity-time graph for motion with uniform velocity is equal to
  A)
   final velocity                 done clear
  B)
   initial velocity done clear
  C)
   zero                              done clear
  D)
   none of these done clear
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• question_answer6)
  The ratio of the numerical values of the average velocity and average speed of a body is
  A)
   unity                            done clear
  B)
   unity or less done clear
  C)
  (e) unity or more             done clear
  D)
   less than unity done clear
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• question_answer7)
  The slope of the tangent drawn on position-time graph at any instant is equal to the instantaneous
  A)
   acceleration                   done clear
  B)
   force done clear
  C)
   velocity done clear
  D)
   momentum done clear
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• question_answer8)
  Which of the following is the correct definition for Average speed?
  A)
   Average speed \[=\frac{\text{total}\,\,\text{displacement}}{\text{total}\,\,\text{time}}\] done clear
  B)
   Average speed \[=\frac{\text{total}\,\,\text{path}\,\,\text{length}}{\text{total}\,\,\text{time}}\] done clear
  C)
   Average speed \[=\frac{\text{change}\,\,\text{in}\,\,\text{speed}}{\text{total}\,\,\text{time}}\] done clear
  D)
   Average speed \[=\frac{\text{sum}\,\,\text{of}\,\,\text{all}\,\,\text{the}\,\,\text{speed}}{\text{total}\,\,\text{time}}\] done clear
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• question_answer9)
  What is the numerical ratio of velocity to speed of an object?
  A)
   Always equal to one done clear
  B)
   Always less than one done clear
  C)
   Always greater than one done clear
  D)
   Either less than or equal to one. done clear
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• question_answer10)
  The acceleration of a moving body can be found from   
  A)
   area under velocity - time graph                    done clear
  B)
   area under distance -time graph                    done clear
  C)
   slope of the velocity- time graph                    done clear
  D)
   slope of distance-time graph done clear
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• question_answer11)
  What determines the nature of the path followed by the particle?
  A)
   Speed               done clear
  B)
   Velocity done clear
  C)
   Acceleration                  done clear
  D)
   Both [b] and [c] done clear
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• question_answer12)
  Acceleration of a particle changes when
  A)
   direction of velocity changes done clear
  B)
   magnitude of velocity changes done clear
  C)
   speed changes done clear
  D)
   Both [a] and [b] done clear
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• question_answer13)
  The area under acceleration time graph gives
  A)
   distance travelled           done clear
  B)
   change in acceleration done clear
  C)
   force acting          done clear
  D)
   change in velocity done clear
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• question_answer14)
  Acceleration is described as rate of change of
  A)
   distance with time done clear
  B)
   velocity with distance done clear
  C)
   velocity with time done clear
  D)
   distance with velocity done clear
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• question_answer15)
  Which of the following is the correct expression of instantaneous acceleration?
  A)
   \[a=\frac{\Delta v}{{{(\Delta t)}^{2}}}\]                       done clear
  B)
   \[a=\frac{dv}{dt}\] done clear
  C)
   \[a=\frac{{{d}^{2}}v}{d{{t}^{2}}}\]                        done clear
  D)
   \[a={{\left( \frac{\Delta v}{\Delta t} \right)}^{2}}\] done clear
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• question_answer16)
  If a body travels with constant acceleration, which of the following quantities remains constant?
  A)
   Displacement                 done clear
  B)
   Velocity done clear
  C)
   Time                            done clear
  D)
   None of these. done clear
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• question_answer17)
  Velocity time curve for a body projected vertically upwards is
  A)
   parabola                       done clear
  B)
   ellipse done clear
  C)
   hyperbola                     done clear
  D)
   straight line done clear
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• question_answer18)
  A body is thrown upwards and reaches its maximum height At that position
  A)
   its acceleration is minimum done clear
  B)
   its velocity is zero and its acceleration is also zero done clear
  C)
   its velocity is zero but its acceleration is maximum done clear
  D)
   its velocity is zero and its acceleration is the acceleration due to gravity. done clear
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• question_answer19)
  Stopping distance of a moving vehicle is directly proportional to
  A)
   square of the initial velocity done clear
  B)
   square of the initial acceleration done clear
  C)
   the initial velocity done clear
  D)
   the initial acceleration      done clear
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• question_answer20)
                           The path of a particle moving under the influence of a force fixed in magnitude and direction is
  A)
   straight line                   done clear
  B)
   circle done clear
  C)
   parabola                       done clear
  D)
   ellipse done clear
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• question_answer21)
  Velocity-time curve for a body projected vertically upwards is
  A)
   parabola                       done clear
  B)
   ellipse done clear
  C)
   hyperbola                     done clear
  D)
   straight line done clear
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• question_answer22)
  An object accelerated downward under the influence of force of gravity. The motion of object is said to be
  A)
   uniform motion done clear
  B)
   free fall done clear
  C)
   non uniformly accelerated motion done clear
  D)
   None of these done clear
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• question_answer23)
  Choose the wrong statement from the following.
  A)
   The motion of an object along a straight line is a rectilinear motion done clear
  B)
   The speed in general is less than the magnitude of the velocity done clear
  C)
   The slope of the displacement-time graph gives the velocity of the body done clear
  D)
   The area under the velocity-time graph gives the displacement of the body done clear
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• question_answer24)
  Free fall of an object (in vacuum) is a case of motion with
  A)
   uniform velocity done clear
  B)
   uniform acceleration done clear
  C)
   variable acceleration done clear
  D)
   constant momentum done clear
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• question_answer25)
  If the displacement of a body varies as the square of elapsed time, then its
  A)
   velocity is constant done clear
  B)
   velocity varies non-uniformly done clear
  C)
   acceleration is constant done clear
  D)
   acceleration changes continuously done clear
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• question_answer26)
  Choose the correct equation to determine distance in a straight line for a body with uniform motion.
  A)
   \[s=\frac{v}{t}\]                       done clear
  B)
   \[s={{v}^{2}}t\] done clear
  C)
   \[s=ut+\frac{1}{2}g{{t}^{2}}\]                       done clear
  D)
   \[s=v\times {{t}^{2}}\] done clear
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• question_answer27)
  If the v-t graph is a straight line inclined to the time axis, then
  A)
   \[a=0\]             done clear
  B)
   \[a\ne 0\] done clear
  C)
   \[a=\operatorname{constant}\ne 0\]        done clear
  D)
  \[a\ne \operatorname{constant}\ne 0\] done clear
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• question_answer28)
  For a moving body at any instant of time
  A)
   if the body is not moving, the acceleration is necessarily zero done clear
  B)
   if the body is slowing, the retardation is negative done clear
  C)
   if the body is slowing, the distance is negative done clear
  D)
   if displacement, velocity and acceleration at that instant are known, we can find the displacement at any given time in future. done clear
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• question_answer29)
  A particle moves 2m east then 4m north then 5 m west. The distance is
  A)
   11 m                done clear
  B)
   10 m done clear
  C)
   -11 m               done clear
  D)
   5 m done clear
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• question_answer30)
  The ball is projected up from ground with speed 30 m/sec. What is the average velocity for time 0 to 4 sec?
  A)
   10 m/sec                       done clear
  B)
   20 m/see done clear
  C)
   15 m/sec                       done clear
  D)
   zero done clear
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• question_answer31)
  A body moves in straight line with velocity \[{{v}_{1}}\] for 1/3rd time and for remaining time with\[{{v}_{2}}\]Find average velocity.
  A)
   \[\frac{{{v}_{1}}}{3}+\frac{2{{v}_{2}}}{3}\]             done clear
  B)
   \[\frac{{{v}_{1}}}{3}+\frac{{{v}_{2}}}{3}\] done clear
  C)
   \[\frac{2{{v}_{1}}}{3}+\frac{{{v}_{2}}}{3}\]             done clear
  D)
   \[{{v}_{1}}+\frac{2{{v}_{2}}}{3}\] done clear
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• question_answer32)
  A particle moves in straight line with velocity\[{{v}_{1}}\], and\[{{v}_{2}}\] for time intervals which are in ratio 1:2. Find average velocity.
  A)
   \[\frac{{{v}_{1}}}{3}+\frac{2{{v}_{2}}}{3}\]             done clear
  B)
  \[\frac{{{v}_{1}}}{3}+\frac{{{v}_{2}}}{3}\] done clear
  C)
  \[\frac{2{{v}_{1}}}{3}+\frac{{{v}_{2}}}{3}\]              done clear
  D)
  \[{{v}_{1}}+\frac{2vl2}{3}\] done clear
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• question_answer33)
  A particle moves from (2,3) m to (4,1) m. The displacement vector is
  A)
   \[2i+2jm\]                     done clear
  B)
   \[-2i-2jm\] done clear
  C)
   \[2i-2jm\]                      done clear
  D)
   \[-2i+2jm\] done clear
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• question_answer34)
  Speed of a body in particular direction can be called
  A)
   acceleration                   done clear
  B)
   displacement done clear
  C)
   velocity            done clear
  D)
   distance done clear
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• question_answer35)
  Speed of snail as compared to speed of a car will be in units
  A)
   \[cm\,\,{{s}^{-1}}\]                 done clear
  B)
   \[m\,\,{{s}^{-1}}\] done clear
  C)
   \[km\,\,{{s}^{-1}}\]                 done clear
  D)
   \[km\,\,{{h}^{-1}}\] done clear
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• question_answer36)
  The speed at any instant of time is known as
  A)
   average speed    done clear
  B)
   velocity done clear
  C)
   given speed                   done clear
  D)
   instantaneous speed done clear
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• question_answer37)
  The average speed of a horse that gallops a distance of 10 km/hr in a time of 1 hour is
  A)
   10 km/hr                       done clear
  B)
   20 km/hr done clear
  C)
   30 km/hr                       done clear
  D)
   More than 30 km/hr done clear
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• question_answer38)
  One possible unit of speed is
  A)
   miles per hour    done clear
  B)
   meters per second done clear
  C)
   yards per century           done clear
  D)
   all of the above done clear
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• question_answer39)
  When a rock thrown straight upward gets to the exact top of its path, its
  A)
   velocity is 0 and its acceleration is about 10 m/s/s done clear
  B)
   velocity is about 10 m/s and its acceleration is 0 done clear
  C)
   velocity is about 10 m/s and its acceleration is about 10 m/s/s done clear
  D)
   velocity is 0 and so is acceleration. done clear
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• question_answer40)
  The part of the car that can change velocity without changing speed is
  A)
   The steering wheel done clear
  B)
   The brake done clear
  C)
   The gas pedal done clear
  D)
   Nonsense, it is impossible to change velocity without changing speed. done clear
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• question_answer41)
  Average speed is
  A)
   a measure of how fast something is moving done clear
  B)
   the distance covered per unit of time done clear
  C)
   always measured in terms of a unit of distance divided by a unit of time done clear
  D)
   all of the above done clear
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• question_answer42)
  When you look at the speedometer in a moving car, you can see the car's
  A)
   instantaneous speed done clear
  B)
   Average speed done clear
  C)
   Instantaneous acceleration done clear
  D)
   Direction done clear
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• question_answer43)
  The 2 measurements necessary for calculating average acceleration are
  A)
   instantaneous velocity & time done clear
  B)
   Change in velocity and time done clear
  C)
   Distance and speed done clear
  D)
   Velocity and distance done clear
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• question_answer44)
  The ____ of a distance versus time graph is speed.
  A)
   slope                done clear
  B)
   y-intercept done clear
  C)
   origin                done clear
  D)
   none of the answers done clear
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• question_answer45)
  Which of the following controls can change a car's velocity?
  A)
   the gas pedal        done clear
  B)
   the brake pedal done clear
  C)
   the steering wheel    done clear
  D)
   all of the above done clear
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• question_answer46)
  A car stops and then a start accelerating uniformly at rate of \[3\,\,m\,\,{{s}^{-2}}\], speed of car after 20 seconds is
  A)
   \[40\,\,m\,\,{{s}^{-2}}\]                       done clear
  B)
   \[60\,\,m\,\,{{s}^{-2}}\] done clear
  C)
   \[100\,\,m\,\,{{s}^{-2}}\]                     done clear
  D)
   \[30\,\,m\,\,{{s}^{-2}}\] done clear
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• question_answer47)
  What is the acceleration of a car that maintains a constant velocity of 100 km/hr for 10 sees?
  A)
   0                                 done clear
  B)
   10 km/hr(s) done clear
  C)
   10m/hr(s)                      done clear
  D)
   1000 km/hr(s) done clear
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• question_answer48)
  Which of the following controls can change a car's velocity?
  A)
   The gas pedal    done clear
  B)
   The brake pedal done clear
  C)
   The steering wheel          done clear
  D)
   All of the above done clear
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• question_answer49)
  A bird flies due east for 600 meters at a constant speed of 10 m/s. What is the bird's acceleration?
  A)
   With no change in velocity, there is no acceleration. done clear
  B)
   60 m/s done clear
  C)
   6 m/s/s done clear
  D)
   60 m/s/s done clear
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• question_answer50)
  Suppose you are in a car going due east on a straight highway at a constant speed of 30 mph. Which of the following is NOT true?
  A)
   You and the car's distance is constantly changing done clear
  B)
   Your speed is constant done clear
  C)
   Your velocity is constant done clear
  D)
   Your direction is constantly changing done clear
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