IST Applied Mathematics 2 — Questions and Answers
Question 1: A pipe has a diameter of 6 inches. What is its circumference? (Use π ≈ 3.14)
- 15.7 in
- 18.84 in (Correct answer)
- 21.5 in
- 24.0 in
Correct answer: 18.84 in
Circumference = π × diameter = 3.14 × 6 = 18.84 inches.
Question 2: A parts bin contains 120 items. If 15% are defective, how many are defective?
- 12
- 16
- 18 (Correct answer)
- 20
Correct answer: 18
15% of 120 = 0.15 × 120 = 18 defective items.
Question 3: Convert 3/8 inch to a decimal.
- 0.25
- 0.375 (Correct answer)
- 0.425
- 0.50
Correct answer: 0.375
Dividing 3 by 8 gives 0.375.
Question 4: A rectangular floor is 20 feet long and 15 feet wide. What is its area?
- 250 sq ft
- 275 sq ft
- 300 sq ft (Correct answer)
- 325 sq ft
Correct answer: 300 sq ft
Area = length × width = 20 × 15 = 300 square feet.
Question 5: A machine runs at 1,200 RPM. How many full rotations does it complete in 30 seconds?
- 400 rotations
- 500 rotations
- 600 rotations (Correct answer)
- 700 rotations
Correct answer: 600 rotations
1,200 RPM ÷ 2 (for 30 seconds) = 600 rotations.
Question 6: A ratio of defective parts is 1:50. In a batch of 1,500 parts, how many are expected to be defective?
- 25
- 30 (Correct answer)
- 35
- 40
Correct answer: 30
1,500 ÷ 50 = 30 defective parts expected.
IST Applied Mathematics 2
A pipe has a diameter of 6 inches.
What is its circumference? (Use π ≈ 3.14)