CBSE Questions for Class 9 Maths Lines And Angles Quiz 2 - MCQExams.com

With respect to the figure, write all pairs of adjacent angles and all the linear pairs. 

243437_d44db93c13ae47b6ae6e58b400baf3bc.png
  •  Adjacent angles: $$\angle AOD \ \ \& \ \ \angle COD$$ 
  • Adjacent angles: $$ \angle BOC \ \ \& \ \ \angle COD$$
  • Linear pairs: $$\angle AOD \ \ \& \ \ \angle BOD$$
  • Linear pairs: $$\angle AOC \ \ \& \ \ \angle BOC$$
Find the measure of the complementary angle of each of $$20^o$$.
  • $$50^o$$
  • $$70^o$$
  • $$160^o$$
  • $$80^o$$
Find the measure of the supplementary angle of $$132^o$$
  • $$48^o$$
  • $$32^o$$
  • $$42^o$$
  • $$38^o$$
A ray stands on a line, then the sum of the two adjacent angles so formed is ______.
  • $$180^\circ$$
  • $$90^\circ$$
  • $$360^\circ$$
  • $$270^\circ$$
Based on the angle measures given, which triangle is not acute?
  • $$35^\circ,\, 69^\circ,\, 76^\circ$$
  • $$60^\circ,\, 60^\circ,\, 60^\circ$$
  • $$88^\circ,\, 46^\circ,\, 46^\circ$$
  • $$90^\circ,\, 45^\circ,\, 45^\circ$$
Based on the given figure, which of the following statements is true?
265967_3db056aea852413b83a41b42b05ee3f4.png
  • $$\angle\, 5$$ and $$\angle\, 7$$ are supplementary angles.
  • $$\angle\, 7\, =\, 55^\circ$$
  • $$\angle\, 8$$ and $$\angle\, 1$$ are corresponding angles.
  • $$\angle\, 4$$ and $$\angle\, 5$$ are alternate angles.
An exterior angle of a triangle is equal to the sum of two ______ opposite angles.
  • interior
  • exterior
  • vertical
  • none of these
Find the measure of the complementary angle of $$90^\circ$$.
  • $$0^\circ$$
  • $$45^\circ$$
  • $$90^\circ$$
  • $$60^\circ$$
If an angle is $$28^o$$ less than its complement, find its measure.
  • $$31^o$$
  • $$131^o$$
  • $$28^o$$
  • $$32^o$$
One of the angles of a triangle is $$65^o$$. Find the remaining two angles, if their difference is $$25^o$$.
  • $$70^o, 45^o$$
  • $$55^o, 40^o$$
  • $$50^o, 85^o$$
  • $$75^o, 40^o$$
$$\displaystyle \angle AOB$$ is a / an _____________ angle.
265554_5bf77144f76d44b6a4cd7c71101739bf.png
  • acute
  • right
  • obtuse
  • none of these
OA and OB are opposite rays.
If $$x=75^o$$, what is the value of y?

243465_460a94dfcdcb42878cf5616492ae2f8c.png
  • $$105^o$$
  • $$75^o$$
  • $$45^o$$
  • $$15^o$$
$$\displaystyle 91^{\circ}$$ is an example of 
  • obtuse
  • acute
  • right
  • Reflex
Fill in the blanks with the correct word from the options given.
Parallel lines are ____ intersecting lines.
  • Always
  • Never
  • Sometimes
  • Data Insuficient
$$\displaystyle 179^{\circ}$$ is an example of 
  • obtuse angle.
  • acute angle.
  • right angle.
  • None of the above
Which angles in the given figure are complementary?
264901_e9cbf09ccb034613ad9c6cff72d7ddf8.png
  • $$\angle\, 1$$ and $$\angle\, 2$$
  • $$\angle\, 2$$ and $$\angle\, 3$$
  • $$\angle\, 3$$ and $$\angle\, 4$$
  • $$\angle\, 4$$ and $$\angle\, 1$$
$$\displaystyle 89^{\circ}$$ is an example of :
  • obtuse
  • acute
  • right
  • None of the above
If two angles in a triangle are $$40^o$$ and $$60^o$$, then the third angle is:
  • $$90^o$$
  • $$80^o$$
  • $$70^o$$
  • $$60^o$$
Given : AB || CD.

If $$\angle\, 2$$ is an acute angle, then $$\angle\, 1$$ is
265957_8e5d0d86be1f4ceabd0471b356a50672.png
  • Acute
  • Right
  • Obtuse
  • Straight
Straight angle is ________
  • $$\displaystyle 90^{\circ}$$
  • $$\displaystyle 180^{\circ}$$
  • $$\displaystyle 60^{\circ}$$
  • $$\displaystyle 45^{\circ}$$
Supplementary angle of $$\displaystyle 102^{\circ}$$ is:
  • $$\displaystyle 180^{\circ}$$
  • $$\displaystyle 90^{\circ}$$
  • $$\displaystyle 78^{\circ}$$
  • $$\displaystyle 60^{\circ}$$
Two complementary angles are in the ratio $$1:9$$. The angles are:
  • $$54^\circ,\, 36^\circ$$
  • $$9^\circ,\, 81^\circ$$
  • $$10^\circ,\, 90^\circ$$
  • $$11^\circ,\, 79^\circ$$
Find x; if $$\angle\, 1\, =\, 5x\, +\, 15^{\circ}$$ and $$\angle\, 2\, =\, 28x$$, angles form linear pair.
  • $$40^{\circ}$$
  • $$140^{\circ}$$
  • $$5^{\circ}$$
  • $$20^{\circ}$$
The supplementary angle of $$120^o$$ is:
  • $$30^o$$
  • $$50^o$$
  • $$240^o$$
  • $$60^o$$
Which two angles are supplementary?
265860_b530984934d04b91ab2e2ce32fd6d17b.png
  • $$\angle\, COF$$ and $$\angle\, AOC$$
  • $$\angle\, COF$$ and $$\angle\, COE$$
  • $$\angle\, COF$$ and $$\angle\, EOD$$
  • $$\angle\, COF$$ and $$\angle\, AOE$$
An angle which is more than $$180^{\circ}$$ and less than $$360^{\circ}$$ is called:
  • obtuse angle
  • right angle
  • reflex angle
  • complete angle
Complement angle of the angle is:
272152_c4172436971d456fafd44a6523888ff5.png
  • $$77.4^{\circ}$$
  • $$67.3^{\circ}$$
  • $$76.3^{\circ}$$
  • $$77.3^{\circ}$$
An angle which measures $$180^{\circ}$$ is called_______angle.
  • zero
  • right
  • straight
  • acute
A line which intersects two or more lines at different points is:
  • perpendicular
  • transversal
  • parallel
  • none of these
An angle which measures more than $$\displaystyle 0^{\circ}$$ and less than $$\displaystyle 90^{\circ}$$ is called 
  • obtuse
  • acute
  • right
  • none of these
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