NCERT Chapter 7 MCQs – Inequalities in Triangles & Properties of Isosceles Triangles
NCERT Chapter 7 MCQs – Inequalities in Triangles & Properties of Isosceles Triangles
Class: 9 | Subject: Mathematics | Chapter: 7 – Triangles
Board: CBSE | Based on Latest NCERT Curriculum
Board: CBSE | Based on Latest NCERT Curriculum
These MCQs are strictly designed as per the CBSE Class 9 Mathematics syllabus and NCERT textbook. Ideal for school exams and board preparation.
1. In a triangle, the side opposite the larger angle is:
Answer: C.
In any triangle, the greater angle lies opposite the longer side.
In any triangle, the greater angle lies opposite the longer side.
2. If one side of a triangle is longer than another, then the angle opposite the longer side is:
Answer: B.
Greater side → greater opposite angle.
Greater side → greater opposite angle.
3. The sum of any two sides of a triangle is always:
Answer: B.
Triangle inequality property.
Triangle inequality property.
4. Which set can form a triangle?
Answer: B.
5+6>7, 6+7>5, 5+7>6.
5+6>7, 6+7>5, 5+7>6.
5. In an isosceles triangle, two sides are:
Answer: B.
Definition of isosceles triangle.
Definition of isosceles triangle.
6. Base angles of an isosceles triangle are:
Answer: B.
Angles opposite equal sides are equal.
Angles opposite equal sides are equal.
7. If two angles of a triangle are equal, the sides opposite them are:
Answer: A.
Converse of isosceles property.
Converse of isosceles property.
8. If sides are 4 cm, 5 cm, and 9 cm, triangle:
Answer: B.
4+5=9 → Not greater.
4+5=9 → Not greater.
9. Largest side is opposite:
Answer: B.
Angle-side relation.
Angle-side relation.
10. In isosceles triangle, median to base is also:
Answer: A.
Special property of isosceles triangle.
Special property of isosceles triangle.
11. If one angle is 100°, triangle is:
Answer: C.
Angle greater than 90°.
Angle greater than 90°.
12. If two sides are 3 cm and 4 cm, third side must be:
Answer: D.
Sum must exceed third side.
Sum must exceed third side.
13. If two angles are 50° and 60°, largest side is opposite:
Answer: C.
Third angle = 70°.
Third angle = 70°.
14. Isosceles triangle has:
Answer: B.
Definition.
Definition.
15. Triangle inequality fails when:
Answer: D.
Sum must be strictly greater.
Sum must be strictly greater.
16. In isosceles triangle, altitude from vertex angle is also:
Answer: C.
Special property.
Special property.
17. If sides are 6, 6, 10, triangle is:
Answer: B.
Two equal sides.
Two equal sides.
18. If one side increases, opposite angle:
Answer: B.
Side-angle inequality property.
Side-angle inequality property.
19. Smallest side is opposite:
Answer: B.
Angle-side relation.
Angle-side relation.
20. In isosceles triangle, base angles are always:
Answer: B.
Opposite equal sides.
Opposite equal sides.
