Motion In A Straight Line CBSE Questions & Answers

This is Physics Class 11 Motion in a Straight Line CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.


Q.1) The position of an object moving in a straight line can be specified with reference to
  1. another straight line
  2. a triangle
  3. an arbitrary star
  4. a conveniently chosen origin
Correct Answer: a conveniently chosen origin
Q.2) for motion in a straight line
  1. position to the left of the origin is taken as positive and to the right as negative.
  2. motion away from origin is positive
  3. position to the right of the origin is taken as positive and to the left as negative.
  4. motion towards origin is positive
Correct Answer: position to the right of the origin is taken as positive and to the left as negative.
Q.3) Path length is defined as.
  1. the distance from origin to maximum point
  2. None of these
  3. the total length of the path traversed by an object
  4. the distance from origin to minimum point
Correct Answer: the total length of the path traversed by an object
Q.4) Path length is a
  1. None of these
  2. tensor
  3. vector
  4. scalar
Correct Answer: scalar
Q.5) In Kinematics we study
  1. Ways to describe motion without going into the causes of motion.
  2. Ways to find velocity without going into the causes of motion.
  3. Ways to find acceleration without going into the causes of motion.
  4. Ways to find jerk without going into the causes of motion.
Correct Answer: Ways to describe motion without going into the causes of motion.
Q.6) For motion in 3 dimensions we need
  1. No frame of reference is required ; a set of 3 points will do.
  2. frame of reference consisting of a clock and a Cartesian coordinate system having two mutually perpendicular axes, labeled X-, and Y- axes
  3. No frame of reference is required a single point will do.
  4. frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes
Correct Answer: frame of reference consisting of a clock and a Cartesian coordinate system having three mutually perpendicular axes, labeled X-, Y-, and Z- axes
Q.7) For one dimensional motion displacement is the
  1. change in position: {tex}\Delta {\rm{x }} = \left( {{\rm{ }}{{\rm{x}}_{\rm{2}}} + {\rm{ }}{{\rm{x}}_{\rm{1}}}} \right)/{\rm{2}}{/tex}
  2. None of these
  3. change in position: {tex}\Delta {\rm{x }} = {\rm{ }}{{\rm{x}}_{\rm{2}}} + {\rm{ }}{{\rm{x}}_{\rm{1}}}{/tex}
  4. change in position: {tex}\Delta {\rm{x }} = {\rm{ }}{{\rm{x}}_{\rm{2}}} - {\rm{ }}{{\rm{x}}_{\rm{1}}}{/tex}
Correct Answer: change in position: {tex}\Delta {\rm{x }} = {\rm{ }}{{\rm{x}}_{\rm{2}}} - {\rm{ }}{{\rm{x}}_{\rm{1}}}{/tex}
Q.8) Displacement is a
  1. tensor
  2. None of these
  3. Vector
  4. scalar
Correct Answer: Vector
Q.9) An object is said to be in uniform motion in a straight line if its displacement
  1. is equal in equal intervals of time.
  2. is equal in not equal intervals of time.
  3. is decreasing in equal intervals of time
  4. is increasing in equal intervals of time
Correct Answer: is equal in equal intervals of time.
Q.10) Average velocity is defined as
  1. the change in average distance from origin ({tex}\Delta {\rm{x}}{/tex}) divided by the time intervals ({tex}\Delta {\rm{t}}{/tex}), in which the displacement occurs
  2. the change in average path length ({tex}\Delta {\rm{x}}{/tex}) divided by the time intervals ({tex}\Delta {\rm{t}}{/tex}), in which the displacement occurs
  3. the change in path length ({tex}\Delta {\rm{x}}{/tex}) divided by the time intervals ({tex}\Delta {\rm{t}}{/tex}), in which the displacement occurs
  4. the change in position or displacement ({tex}\Delta {\rm{x}}{/tex}) divided by the time intervals ({tex}\Delta {\rm{t}}{/tex}), in which the displacement occurs
Correct Answer: the change in position or displacement ({tex}\Delta {\rm{x}}{/tex}) divided by the time intervals ({tex}\Delta {\rm{t}}{/tex}), in which the displacement occurs
Q.11) Average speed is defined as
  1. the total path length travelled divided by the total time interval during which the motion has taken place
  2. the total path length travelled divided by the time interval during which uniform motion has taken place
  3. the total path length travelled divided by the time interval during which minimum motion has taken place
  4. the total path length travelled divided by the time interval during which maximum motion has taken place
Correct Answer: the total path length travelled divided by the total time interval during which the motion has taken place
Q.12) Average speed is
  1. always negative
  2. always positive
  3. never positive
  4. always zero
Correct Answer: always positive
Q.13) Instantaneous velocity or simply velocity v at an instant t equals
  1. {tex}\mathop {\lim }\limits_{{\rm{t}} \to 1} {{\Delta x} \over {\Delta t}}{/tex}
  2. {tex}\mathop {\lim }\limits_{{\rm{t}} \to 0} {{\Delta x} \over {2\Delta t}}{/tex}
  3. {tex}\mathop {\lim }\limits_{{\rm{t}} \to \infty } {{\Delta x} \over {\Delta t}}{/tex}
  4. {tex}\mathop {\lim }\limits_{{\rm{t}} \to 0} {{\Delta x} \over {\Delta t}}{/tex}
Correct Answer: {tex}\mathop {\lim }\limits_{{\rm{t}} \to 0} {{\Delta x} \over {\Delta t}}{/tex}
Q.14) While determining velocity from position-time graph. Velocity at any time
  1. is the slope of the perpendicular to tangent to the graph at that instant
  2. None of these
  3. is the slope of the line from origin to the point on the graph at that instant
  4. is the slope of the tangent to the graph at that instant.
Correct Answer: is the slope of the tangent to the graph at that instant.
Q.15) If the position- time graph is a straight line
  1. The velocity is decreasing
  2. The velocity is zero
  3. The velocity is constant
  4. The velocity is increasing
Correct Answer: The velocity is constant

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