11th Class Physics Motion in a Straight Line / सरल रेखा में गति Question Bank

done Motion in a straight line conceptual problems Total Questions - 41

• question_answer1)
  When does a cyclist appear to be stationary with respect to another moving cyclist?
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• question_answer2)
  Can the earth be regarded as point object when it is describing its yearly journey around the sun?
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• question_answer3)
  Can the displacement be greater than the distance travelled by an object? Give reason.
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• question_answer4)
  Can the speed of a body be negative?
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• question_answer5)
  Can a body have a constant speed and still have a varying velocity?
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• question_answer6)
  Can a body have a constant velocity and still have a varying speed?
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• question_answer7)
  Can a particle in one-dimensional motion have zero speed and a non-zero velocity?
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• question_answer8)
  Can a body have zero velocity and still be accelerating?
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• question_answer9)
  Can an object have an eastward velocity while experiencing a westward acceleration?
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• question_answer10)
  Can the direction of velocity of an object change, when acceleration is constant?
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• question_answer11)
  Is it possible for a body to be accelerated without speeding up or slowing down? If so, give an example.                          
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• question_answer12)
  Under what condition is the average velocity equal to the instantaneous velocity?
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• question_answer13)
  Why is the speed, in general, greater than the magnitude of the velocity?
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• question_answer14)
  Is the direction of acceleration same as the direction of velocity?
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• question_answer15)
  Can we use the equations of kinematics to find the height attained by a body projected upwards; with any velocity?                                    
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• question_answer16)
                                      Two balls of different masses (one lighter and other heavier) are thrown vertically upward with same initial speed. Which one will rise to the greater height?
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• question_answer17)
  Two balls of different masses (one lighter and other heavier) are thrown vertically upwards; with the same speed. Which one will pass through the point of projection in their downward direction with the greater speed?
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• question_answer18)
  Can the relative velocity of two bodies be greater than the absolute velocity of either body?
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• question_answer19)
  A car travelling with a velocity of \[\mathbf{50km }{{\mathbf{h}}^{\mathbf{-1}}}\] on a straight road is ahead of a motor-cycle travelling with a speed of\[\mathbf{75km }{{\mathbf{h}}^{\mathbf{-1}}}\]. How would the relative velocity be altered if motor cycle is ahead of car?
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• question_answer20)
  Even when rain is falling vertically downwards, the front screen of a moving car gets wet while the back screen remains dry. Why?
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• question_answer21)
  Is it possible that the brakes of a car are so perfect that the car stops instantaneously. If not, why?
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• question_answer22)
  When an observer is standing on earth, the trees and houses appear stationary to him. However, when he is sitting in a moving train, all these objects appear to move in backward direction. Why?
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• question_answer23)
  The displacement of a body is given to be proportional to the cube of time elapsed. What is the nature of the acceleration of the body?
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• question_answer24)
  The average velocity of a particle is equal to its instantaneous velocity. What is the nature of its displacement-time graph?
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• question_answer25)
  Can the position-time graph have a negative slope?
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• question_answer26)
  What is the nature of the displacement- time curve of a body moving with constant velocity?
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• question_answer27)
  Can the direction of motion of a body change if its velocity is changing at uniform rate?
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• question_answer28)
  Draw position-time graphs for two objects having zero relative velocity.
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• question_answer29)
  Is it possible to have a constant rate of change of velocity when velocity changes both in magnitude and direction? If yes, give one example.       
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• question_answer30)
  Can a body be at rest as well as in motion at the same time? Explain.         Or Rest and motion are relative terms. Explain.
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• question_answer31)
  If the displacement of a body is zero, is the distance covered by it necessarily zero? Comment with suitable illustration.
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• question_answer32)
  State in the following cases, whether the motion is one, two or three dimensional: (i)a kite flying on a windy day, (ii) a speeding car on a long straight high way, (iii) a carrom coin rebounding from the side of the board, (iv) an insect crawling on a globe, and (v) a planet revolving around its star ?
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• question_answer33)
  Which of the two-velocity or acceleration, gives the direction of motion of the body. Justify your answer by an example.
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• question_answer34)
  Two straight lines drawn on the same displacement-time graph make angles \[\mathbf{30}{}^\circ \]and \[\mathbf{60}{}^\circ \] with time-axis respectively, as shown in Fig. Which line represents greater velocity? What is the ratio of the two velocities?                                 
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• question_answer35)
  If in case of a motion, displacement is directly proportional to the square of the time elapsed, what do you think about its acceleration i.e., constant or variable? Explain why.             
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• question_answer36)
  Show that the average velocity of an object over an interval of time is either smaller than or equal to the average speed of the object over the same interval.
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• question_answer37)
  An object is in uniform motion along a straight line. What will be position-time graph for the motion of the object if (a) \[{{x}_{0}}=+\mathbf{ve},\upsilon =+ve\] (b) \[{{x}_{0}}=+\mathbf{ve},\upsilon =-ve\] (c) \[{{x}_{0}}=+\mathbf{ve},\upsilon =-\mathbf{ve}\] (d) Both \[{{x}_{0}}\] and \[\upsilon \]are negative? The letters \[{{x}_{0}}\] and \[\upsilon \] represent position of the object at \[t=0\]and uniform velocity of the object respectively.
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• question_answer38)
  An object has uniformly accelerated motion. The object always slows down before the time, when its velocity becomes zero. Prove this statement graphically, when (a) both u and a are positive (b) \[u=-ve\] and \[a=+ve\](c) \[u=+ve\]and \[a=-ve\] and (d) both u and a are negative.
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• question_answer39)
  The distance covered by an object between times \[{{t}_{1}}\] and \[{{t}_{2}}\] given by the area under the \[\upsilon -t\]graph between \[{{t}_{1}}\] and \[{{t}_{2}}\] Prove this statement for an object moving with negative acceleration and having a positive velocity at time \[{{t}_{1}}\] and a negative velocity at time \[{{t}_{2}}\]
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• question_answer40)
  Distinguish between distance and displacement.
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• question_answer41)
  Distinguish between speed and velocity.
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