Question

Identify the object that has no flat surfaces.

• A. Objects 3 and 6
• B. Objects 3 and 5
• C. Objects 1 and 3
• D. Objects 1 and 7

Answer 1

The correct option is D Objects 1 and 7

$\text{Say:}$Let’s read the question and observe the image.

$\text{Ask:}$
$\bullet$ What do we have to do here?
Ans: We have to identify the shapes with no flat surfaces.

$\text{Say:}$Let’s look at each object.

$\text{Ask:}$
$\bullet$ What is the shape of Object 1, and how will you describe its surface?
Ans: Object 1 has a curved surface and no flat surfaces, so it is a sphere.

$\bullet$ What is the shape of Object 2, and how will you describe its surface?
Ans: Object 2 has 6 flat surfaces, so it is a rectangular prism.

$\bullet$ What is the shape of Object 3, and how will you describe its surface?
Ans: Object 3 has two flat round surfaces, a curved surface, so it is a cylinder.

$\bullet$ What is the shape of Object 4, and how will you describe its surface?
Ans: Object 4 has 6 square-shaped flat surfaces, so it is a cube.

$\bullet$ What is the shape of Object 5, and how will you describe its surface?
Ans: Object 5 has two flat round surfaces and a curved surface, so it is again a cylinder.

$\bullet$ What is the shape of Object 6, and how will you describe its surface?
Ans: Object 6 has a flat face that is circular and 1 curved face, so it is a cone.

$\bullet$ What is the shape of Object 7, and how will you describe its surface?
Ans: Object 7 has only a curved surface and no flat surfaces, so it is a sphere.

$\bullet$ What is the shape of Object 8, and how will you describe its surface?
Ans: Object 8 has 6 square-shaped flat surfaces, so it is a cube.

$\bullet$ So, which objects have no flat surfaces?
Ans: Objects 1 and 7 are spheres that have no flat surfaces.

Hence, Option A is correct.