Motion In A Plane CBSE Questions & Answers

Motion In A Plane

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

Questions & Answers

1
The basic difference between a scalar and vector is one of
  • A
    polar angle
  • B
    magnitude
  • C
    direction
    Correct
  • D
    origin
2
Vectors can be added by
  • A
    adding the magnitudes of the vectors
  • B
    triangle law of addition
    Correct
  • C
    translating the two vectors
  • D
    adding the angles of the vectors
3
Magnitude of displacement of a particle is
  • A
    is more than the path length of the particle between two points
  • B
    is equal to the path length of the particle between two points
  • C
    is less than the path length of the particle between two points
  • D
    is either less or equal to the path length of the particle between two points
    Correct
4
Two vectors are equal if
  • A
    the two vectors have opposite directions
  • B
    the magnitude is the same for both
  • C
    the direction is the same for both
  • D
    the magnitude and direction are the same for both
    Correct
5
Multiplying a vector \(\vec v\) by a positive real number \(\lambda\)
  • A
    gives a vector \(\overrightarrow {v'} \) = \(\lambda \vec v\)in a direction opposite to \(\vec v\)
  • B
    gives a scalar that is \(\lambda \) times the polar angle of \(\vec v\)
  • C
    gives a vector \(\overrightarrow {v'} \) = \(\lambda \vec v\)in the same direction as \(\vec v\)
    Correct
  • D
    gives a scalar that is \(\lambda \) times the magnitude of \(\vec v\)
6
Multiplying a vector \(\vec v\) by a negative real number \(\lambda\)
  • A
    gives a scalar that is \(\lambda \) times the magnitude of \(\vec v\)
  • B
    gives a vector \(\overrightarrow {v'} \) = \(\lambda \vec v\)in the same direction as \(\vec v\)
    Correct
  • C
    gives a vector \(\overrightarrow {v'} \) = \(\lambda \vec v\)in a direction opposite to \(\vec v\)
  • D
    gives a scalar that is \(\lambda \) times the polar angle of \(\vec v\)
7
To find the sum of vectors A and B, we place vector B
  • A
    so that its direction is the same as that of vector A
  • B
    so that its tail is at the tail of the vector A
  • C
    so that its tail is at the head of the vector A
    Correct
  • D
    so that its head is at the head of the vector A
8
Vector addition is
  • A
    non-commutative
  • B
    intransitive
  • C
    commutative
    Correct
  • D
    asymmetric
9
The addition of vectors and the multiplication of a vector by a scalar together gives rise to
  • A
    commutative law
  • B
    asymmetric laws
  • C
    distributive laws
    Correct
  • D
    intransitive law
10
Null vector or a zero vector has a magnitude
  • A
    less than zero
  • B
    greater than zero
  • C
    equal to zero
    Correct
  • D
    that is complex
11
We can define the difference of two vectors A and B as the
  • A
    sum of two vectors A and B' such that B' is equal to B multiplied by 0
  • B
    sum of two vectors A and B' such that B' is equal to B multiplied by -2
  • C
    sum of two vectors A and B' such that B' is equal to B multiplied by -1
    Correct
  • D
    sum of two vectors A and B' such that B' is equal to B multiplied by 1
12
An arbitrary vector v can be expressed as
  • A
    a sum of three mutually perpendicular unit vectors each multiplied scalar constant equal to 1
  • B
    a sum of three mutually perpendicular unit vectors each multiplied by the same scalar constant
  • C
    a sum of three mutually perpendicular unit vectors each multiplied by a some scalar constant
    Correct
  • D
    a sum of three mutually perpendicular unit vectors each multiplied scalar constant equal to -1
13
A unit vector is a vector
  • A
    having a magnitude of 1 and points in any chosen direction
    Correct
  • B
    having a magnitude of 1 and points in x-direction
  • C
    having a magnitude of 1 and points in z-direction
  • D
    having a magnitude of 1 and points in y-direction
14
An arbitrary vector \(\vec A\) in a plane can be expressed in terms of its x and y components by the equation
  • A
    \(\vec A = {A_x}\hat i + {A_y}\hat j\)
    Correct
  • B
    \({\rm{}}\vec A = {A_x} - {A_y}\)
  • C
    \(\vec A = {A_x}\hat i - {A_y}\hat j\)
  • D
    \({\rm{}}\vec A = {A_x} + {A_y}\)
15
If \({A_x},{A_y}and{A_z}\) are x, y and z components of a vector then its magnitude is
  • A
    \(\sqrt {A_x^2 + A_y^2 + A_z^3} \)
  • B
    \(\sqrt {3A_x^2 + A_y^2 + A_z^2} \)
  • C
    \(\sqrt {A_x^2 + A_y^2 + A_z^2} \)
    Correct
  • D
    \(\sqrt {A_x^2 + 2A_y^2 + A_z^2} \)