Lines And Angles CBSE Questions & Answers

Lines And Angles

This is Mathematics Class 09 Lines and Angles CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
An exterior angle of a triangle is \({\rm{8}}{0^0}\) and the interior opposite angles are in the ratio 1 : 3. Measure of each inte4rior opposite angle is :
  • A
    30\(^0\), 90\(^0\)
  • B
    20\(^0\), 60\(^0\)
    Correct
  • C
    30\(^0\), 60\(^0\)
  • D
    40\(^0\), 120\(^0\)
2
Two planes intersect each other to form a :
  • A
    plane
  • B
    point
  • C
    straight line
    Correct
  • D
    angle
3
In figure, AB and CD are parallel to each other. The value of x is :
Question 3 figure 1
  • A
    120\(^0\)
  • B
    90\(^0\)
  • C
    100\(^0\)
    Correct
  • D
    140\(^0\)
4
In two interior angles on the same side of a transversal intersecting two parallel lines are in the ratio 5 : 4, then the smaller of the two angles is :
  • A
    120\(^0\)
  • B
    80\(^0\)
    Correct
  • C
    60\(^0\)
  • D
    100\(^0\)
5
The number of triangles that can be drawn having its angles as 50\(^0\), 60\(^0\) and 70\(^0\) is :
  • A
    two
  • B
    only one
  • C
    none of these
  • D
    infinitely many
    Correct
6
How many triangle can be drawn having its angles as 45\(^0\), 60\(^0\) and 85\(^0\) ?
  • A
    none
    Correct
  • B
    two
  • C
    infinitely many
  • D
    only one
7
The sides of a quadrilateral are extended in order to form exterior angles. The sum of these exterior angles is :
  • A
    720\(^0\)
  • B
    90\(^0\)
  • C
    360\(^0\)
    Correct
  • D
    180\(^0\)
8
In figure, if AB \(\parallel \) CF, CD \(\parallel \) EF, then the value of x is :
Question 8 figure 1
  • A
    100\(^0\)
  • B
    120\(^0\)
  • C
    140\(^0\)
  • D
    110\(^0\)
    Correct
9
The sum of all the angles of a quadrilateral is :-
  • A
    180\(^0\)
  • B
    560\(^0\)
    Correct
  • C
    400\(^0\)
  • D
    320\(^0\)
10
Each angle of an equilateral triangle is :
  • A
    30\(^0\)
  • B
    90\(^0\)
  • C
    45\(^0\)
  • D
    60\(^0\)
    Correct
11
The incorrect statement is :
  • A
    Three lines are concurrent if and only if they have a common point.
  • B
    A line segment has definite length.
  • C
    Two lines drawn in a plane always intersect at a point.
    Correct
  • D
    One and only one line can be drawn passing through a given point and parallel to a given line.
12
If a transversal intersects two parallel lines, then which of the following alternatives is not true ?
  • A
    Each pair of co-interior angles is supplementary.
  • B
    Each pair of corresponding angles is equal.
  • C
    Each pair of co-interior angles is complementary.
    Correct
  • D
    Each pair of alternate interior angles is equal.
13
Two angles measure (70 + 2x) \(^0\) and (3x – 15) \(^0\). If each angle is the supplement of the other, then the value of x is :
  • A
    25
    Correct
  • B
    30
  • C
    250\(^0\)
  • D
    20
14
In the adjoining figure, the value of x is –
Question 14 figure 1
  • A
    18
  • B
    15
    Correct
  • C
    10
  • D
    12
15
In the adjoining figure, \(\angle \) a and \(\angle \)g are called :-
Question 15 figure 1
  • A
    alternate exterior angles
    Correct
  • B
    alternate interior angles
  • C
    co-interior angles.
  • D
    corresponding angles