Motion In A Straight Line CBSE Questions & Answers

Motion In A Straight Line

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.

Questions & Answers

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