Class 8 Nets of Solids — practice questions with answers
Geometry · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
1. A net is a two-dimensional figure that can be folded to form which kind of object?
AA solid (3-D shape)
BA straight line
CA point
DA circle only
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Answer: A) A solid (3-D shape)
A net is a flat (2-D) arrangement of faces that folds up along its edges to make a 3-D solid.
2. How many distinct nets does a cube have (counting nets that look the same after rotation/reflection as one)?
A11
B12
C10
D22
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Answer: A) 11
A cube has exactly 11 distinct nets.
3. How many rectangular faces are there in the net of a cuboid that is NOT a cube?
A7
B6
C12
D5
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Answer: B) 6
A cuboid always has 6 rectangular faces regardless of whether it is a cube.
4. A square pyramid has a base of side 10 cm. Each triangular face has a slant height of 8 cm. What is the total area of the FOUR triangular faces in its net?
A175
B160
C320
D145
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Answer: B) 160
Each triangle = 21*base*slant = 21*10*8 = 40 cm². Four triangles = 4*40 = 160 cm².
5. An open cardboard tray (cuboid with no top) is 15 cm long, 10 cm wide and 4 cm high. Its net has a base and 4 walls. Find the total cardboard area of the net (base plus four walls).
A350
B315
C700
D385
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Answer: A) 350
Base = 15*10 = 150. Two walls of 15*4 = 60 each -> 120. Two walls of 10*4 = 40 each -> 80. Total = 150 + 120 + 80 = 350 cm².