[CLASS 9] Mathematics MCQs on Surface Areas and Volumes

Mathematics Multiple Choice Questions on “Surface Areas and Volumes”.

1. Total surface area of a cuboid having dimensions l*b*h is __________
a) l*b*h
b) 2(lb + bh + lh)
c) lb + bh + lh
d) 6l²

2. Total surface area of a cube having sides l is given by __________
a) l*b*h
b) 2(lb + bh + lh)
c) lb + bh + lh
d) 6l²

3. A cube of side equal to 20 cm is open from the top. Its total surface area is __________ cm².
a) 2000
b) 2400
c) 2500
d) 8000

Answer: a
Clarification: The cube is open from the top, hence total surface area of the cube will be equal to 6l² – l² = 5l²
= 5(20)²
= 5(400)
= 2000.