Subject: General Aptitude · Chapter: Volume and Surface Area · Exam: · Marks: · Difficulty:
If 1 cubic cm of cast iron weighs 21 gms, then find the weight of a cast iron pipe of length 1 metre with a bore of 3 cm and in which thickness of the metal is 1 cm. 3
Answer
Answer (as printed):
Explanation
Inner radius = cm = 1.5 cm, 2 770 QUANTITATIVE APTITUDE Outer radius = (1.5 + 1) cm = 2.5 cm. ∴ Volume of iron = [p × (2.5)2 × 100 – p × (1.5)2 × 100] cm3 22 8800 = × 100 × [(2.5)2 − (1.5)2 ] cm 3 = 3 cm . 7 7 8800 21 ∴ Weight of the pipe = × kg = 26.4 kg. 7 1000
Explanation as extracted from the printed page; notation may be imperfect.