15

Q1. Name the cross section when a cone is cut vertically.

• Circle
• Square
• Rectangle
• Triangle

Solution

Triangle

Q2. Which of the following is an example of 3D object?

• Circle
• Triangle
• Rectangle
• Cube

Solution

Cube is a 3D object

Q3. If three cubes of dimensions 3 cm by 3 cm by 3 cm are placed side by side, what would the dimensions of the resulting cuboid be?

• 9 cm x 3 cm x 3 cm
• 6 cm x 3 cm x 3 cm
• 9 cm x 3 cm x 9 cm
• 9 cm x 6 cm x 3 cm

Solution

Length = 3 cm + 3 cm + 3 cm = 9 cm Width = 3 cm Height = 3 cm Hence, dimension is 9 cm x 3 cm x 3 cm.

Q4. What do you mean by a net of 3D shape?

• Net is 2D shape made up of nets.
• Net is a layout which when folded from edges forms the 3D shape.
• Net is nothing but the 2D image of 3D object.
• Net is collection of blocks of a 3D shape.

Solution

Net is a layout which when folded from edges forms the 3D shape.

Q5. A cone cut along it's curved surface and unfolded takes the shape of a _________.

• Sector
• Segment
• Circle
• Rectangle

Solution

Sector

Q6. Number of faces in a cube is

• 4
• 6
• 8
• 12

Solution

A cube has 6 faces.

Q7. A pyramid has_____ faces.

• Triangular
• Circular
• Rectangular
• Square

Solution

Pyramid has triangular faces.

Q8. A 2D skeleton outline used to make a 3D shape is called

• Net
• Sketch
• Outline
• Border

Solution

A 2D skeleton outline used to make a 3D shape is called a net of the solid.

Q9. Which of the following is not an example of 3D object?

• Sphere
• Circle
• Cylinder
• Cone

Solution

Circle is a 2D object

Q10. 4 congruent triangles are placed along the sides of a square such that side of the square is equal to base of the triangle. If we join the vertices of the triangle it becomes a

• Prism
• Pyramid
• Cylinder
• Cuboid

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