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
If the position- time graph is a straight line parallel to the time axis
  • A
    The velocity is constant but non zero
  • B
    The velocity is increasing
  • C
    The velocity is zero
    Correct
  • D
    The velocity is decreasing
2
The average acceleration a over a time interval is defined as
  • A
    the change of velocity divided by the time interval
    Correct
  • B
    average displacement divided by the time interval
  • C
    average velocity divided by the time interval
  • D
    average speed divided by the time interval
3
Instantaneous acceleration is defined as
  • A
    \({{dx} \over {dt}}\)
  • B
    \({{{d^2}v} \over {d{t^2}}}\)
  • C
    \(\mathop {\lim }\limits_{{\rm{t}} \to 0} {{\Delta v} \over {\Delta t}}\)
    Correct
  • D
    v/t
4
For uniformly accelerated motion velocity at time t is given by
  • A
    \(v = {v_0} + 2at\)
  • B
    \(v = t{v_0} + 2a\)
  • C
    \(v = {v_0} + at\)
    Correct
  • D
    \(v = t{v_0} + a\)
5
For uniformly accelerated motion displacement x at time t is given by
  • A
    \(x = {v_0}t + 2a{t^2}\)
  • B
    \(x = {v_0}t + a{t^2}\)
  • C
    \(x = {v_0}t + {1 \over 2}a{t^2}\)
    Correct
  • D
    \(x = 2{v_0}t + {1 \over 2}a{t^2}\)
6
For uniformly accelerated motion if displacement is x and the initial velocity is \({v_0}\) the formula for velocity is
  • A
    \({v^2} = v_0^2 + 2ax\)
    Correct
  • B
    \({v^3} = v_0^2 + 2ax\)
  • C
    \({v^2} = v_0^2 + ax\)
  • D
    \({v^2} = v_0^3 + 2ax\)
7
For motion with uniform acceleration, x-t graph is
  • A
    a parabola
    Correct
  • B
    a cubic
  • C
    a straight line
  • D
    a hyperbola
8
For motion with uniform acceleration, v-t graph is
  • A
    a straight line inclined to the time axis.
    Correct
  • B
    a straight line parallel to the time axis
  • C
    an ellipse
  • D
    a straight line perpendicular to the time axis
9
The area under the velocity-time curve between times \({{\rm{t}}_{\rm{1}}}\) and \({{\rm{t}}_{\rm{2}}}\) is equal to the.
  • A
    displacement of the object during that interval of time
    Correct
  • B
    average velocity of the object during that interval of time
  • C
    path length of the object during that interval of time
  • D
    velocity of the object during that interval of time
10
If the velocities of two particles A and B are respectively \({{\rm{v}}_{\rm{A}}}\) and \({{\rm{v}}_{\rm{B}}}\) velocity of object B relative to object A is
  • A
    \({{\rm{v}}_{{\rm{AB}}}} = {\rm{ }}{{\rm{v}}_{\rm{B}}} + {\rm{ }}{{\rm{v}}_{\rm{A}}}\)
  • B
    \({{\rm{v}}_{{\rm{AB}}}} = {\rm{ }} - {{\rm{v}}_{\rm{B}}} + {\rm{ }}{{\rm{v}}_{\rm{A}}}\)
  • C
    \({{\rm{v}}_{{\rm{AB}}}} = {\rm{ }} - {{\rm{v}}_{\rm{B}}} - {\rm{ }}{{\rm{v}}_{\rm{A}}}\)
  • D
    \({{\rm{v}}_{{\rm{AB}}}} = {\rm{ }}{{\rm{v}}_{\rm{B}}} - {\rm{ }}{{\rm{v}}_{\rm{A}}}\)
    Correct
11
in which of the following examples of motion, can the body be considered approximately a point object?
  • A
    a tumbling beaker that has slipped off the edge of a table
  • B
    a spinning top moving on a curved path
  • C
    a railway carriage moving without jerks between two stations
    Correct
  • D
    a spinning cricket ball that turns sharply on hitting the ground
12
Domestic power supply in India is
  • A
    24 V DC
  • B
    110 V 60 Hz
  • C
    416 V 60 Hz
  • D
    230 V 50 Hz
    Correct
13
A stone is thrown from the top of a building upward at an angle of 30.0\(^\circ \) to the horizontal and with an initial speed of 20.0 m/s. If the height of the building is 45.0 m, how much time is it in seconds before the stone hits the ground? g =9.8 m / \({\rm{se}}{{\rm{c}}^{\rm{2}}}\)
  • A
    4.32 s
  • B
    4.22 s
    Correct
  • C
    4.12 s
  • D
    4.02 s
14
A stone is thrown from the top of a building upward at an angle of 30.0\(^\circ \) to the horizontal and with an initial speed of 20.0 m/s. If the height of the building is 45.0 m, what is the speed in m/sec of the stone just before it strikes the ground?
  • A
    37.9
  • B
    31.2
  • C
    35.9
    Correct
  • D
    30.9
15
With reference to the figure below which shows a particle moving along a straight line , y axis represents the position and x axis represents time, if \({{\rm{x}}_{\rm{2}}}\) = 290.4m and the velocity at t = 3.8 sec is 130 m/s The instantaneous acceleration at \({{\rm{x}}_{\rm{2}}}\) in m/ \({\rm{se}}{{\rm{c}}^{\rm{2}}}\) is
Question 15 figure 1
  • A
    12
  • B
    17
  • C
    10.0
    Correct
  • D
    14