Answer: Option A. ->
:
D
A rectangular base pyramid is a combination of four triangles and one square.

:
Number of faces (F) = 4
Number of edges (E) = 6
Number of vertices (V) = 4
Hence, F + E + V = 14.

:
Number of faces (F) = 6
Number of edges (E) = 12
Number of vertices (V) = 8
Hence, F + E + V = 26

Answer: Option B. -> False
:
B
From the figure,

Number of edges (E) = 12
Number of vertices (V) = 8
Hence, E + V = 20.

:
In a die, the sum of numbers on opposite faces is 7.
So, 3+2+1+A+B+C = 7×3
So, A+B+C = 15.

Answer: Option B. -> 6
:
B
It is given that the figure can be formed in the shape of the die, we know that the sum of numbers on opposite faces of a die is 7.
When we form adie with the given shape, the number on the opposite face of A, Band C will be 2,1 and3 respectively.
So, number on the opposite face of Bis 1.
$⟹$B+1=7
$⟹$B= 7-1 = 6
$⟹$B= 6

Answer: Option B. -> 6
:
B
A cylinder is a combination of two circular shapes and one rectangular shape.

Answer: Option A. -> True
:
A
From the figure,

a diecan be made.

:
Definition: 1 Mark each
a.Avertex(plural:vertices) is a point where two or more straight lines meet. E.g. The 8 corners of the cube are its vertices.
b.An edge is a line segment that joins two vertices. E.g.The 12 line segments that form the skeleton of the cube are its edges.
c.A face is any of the individual surfaces of a solid object. E.g. The 6 flat square surfacesof the cube are its faces.

:
Each part: 2 Marks
(a) There are 3 vertical columns of sugar bags in this box.
The first column has 9 bags of which 5 can be seen and the other 4 are completely hidden.
The second column has 6 bags of which 4 can be seen, and similarly, the third column has 3 bags.
So, the total number of bags = 9 + 6 + 3 = 18.
(b) Now, in the second column, we can see that there is space for 3 more bags and the third column has space for 6 more bags.
The remaining space can be filled with 2 more vertical columns, each having 9 bags.
So, there is a space in the box for $3+6+(9\times 2)=9+18=27$ more bags.