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E:\Working\Focus_Learning\Math_Genius-8\Open_Files\12_Chapter_9\Chapter_9
\ 06-Jan-2025 Surendra Prajapati Proof-7 Reader’s Sign _______________________ Date __________

Chapter assessment
A. Choose the correct option.

1. Which of the following is a polyhedron?
(a) sphere (b) cube (c) cone (d) triangle

2. Which of the following is not a two-dimensional figure?
(a) trapezium (b) prism (c) kite (d) rhombus
3. The number of faces of a pyramid with square base is

(a) 5 (b) 6 (c) 7 (d) 8
4. In the blueprint of a room, an architect has shown the height of the room as 3 cm. If the actual
height of the room is 420 cm, then the scale used by the architect is
(a) 1 : 110 (b) 1 : 120 (c) 1 : 140 (d) 1 : 14

B. Assertion and Reason type question.
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct option.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.

(d) Assertion (A) is false but Reason (R) is true.
1. Assertion (A): A cube is a regular polyhedron.

Reason (R): A polyhedron is said to be a regular polyhedron if all its faces are congruent.
2. Assertion (A): The side view of a cone looks like a triangle.
Reason (R): A cone is a three-dimensional geometric shape that tapers smoothly from a flat base.

3. Assertion(A): The base of a pyramid can be a polygon of any number of sides.
Reason (R): A square pyramid is a three-dimensional geometric shape with four triangular sides,
five vertices, eight edges, and the triangular faces meet at a single point called the
vertex.
C. Fill in the blanks.
1. A solid figure with only one vertex is known as a ............... .

2. A regular polyhedron is a solid made up of ............... faces.
3. If the actual distance between A and B is 110 km, and is represented on a map by 22 mm, then the
scale used is ............... .
4. A regular hexahedron is also called a ............... .
5. Total number of faces in a pyramid, which has 8 edges is ............... .

D. State whether the following statements are True (T) or False (F).
1. A polyhedron can have 3 faces.

2. Pentagonal prism can have 5 pentagons.

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