S.chand publication New Learning Composite mathematics solution of class 7 Chapter 13 Visualising Solid Shapes (Representing 3D in 2D) Exercise 13A

 Exercise 13A

Question 1

Fill in the blanks

(a) The common portion of two adjacent faces of cuboid is called an edge.

(b) A plane surface of a solid enclosed by edges is called a face.

(c) The corners of a solid shapes are called its vertices

(d) A solid with no vertex is a sphere

(e) The base of a triangular pyramid is a triangle


Question 2

(a) The faces of a cube are squares

(b) The faces of a cuboid are rectangles

(c) A square pyramid has a square base an triangular faces

(d) The base and top of a prism are parallel congruent polygons

(e) The faces of a prism are parallelograms


Question 3

(a) A solid that has one curved face and two flat circular faces is called cylinder

(b) A solid that has one flat circular face, one curved face and one vertex is called a cone

(c) A solid that has only a curved surface and neither a vertex nor an edge is called a sphere


Question 4

(a) A triangular prism has 5 faces, 9 edges and 6 vertices

(b) A triangular pyramid has 4 faces, 6 edges and 4 vertices

(c) A square pyramid has 5 faces, 8 edges and 5 vertices


Question 5

(a) Two parallel congruent square bases and four other polygon faces

=Square prism

(b) Two parallel, congruent circular bases and one curved surface

=Cylinder

(c) One triangular base and three triangular faces

=Triangular pyramid

(d) One circular base and one curved surface

=Cone

(e) No vertex, no edge , only curve surface

=Sphere


Question 6

(a) 7+10-15=2

(b) 6+8-12=2

(c) 7+7-12=2

(d) 9+9-16=2


Question 7

(a) 4 faces Triangular pyramid

(b) 4 vertices Triangular pyramid

(c) 2 edges Cylinder

(d) 6 vertices Prism

(e) No edges Sphere

(f) 6 faces Cube, Cuboid


Question 8

Which of there solids has the maximum number of vertices?

(c) Cuboid


Question 9

If F=6 and V=4, then the value of E using Euler's formula is

(b) 8

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