N-Level Mathematics 4 — Questions and Answers
Question 1: What is the volume of a cube with side length 3 cm?
- 9 cm³
- 18 cm³
- 27 cm³ (Correct answer)
- 36 cm³
Correct answer: 27 cm³
Volume = side³ = 3³ = 3 × 3 × 3 = 27 cm³.
Question 2: An item costs $120 after a 20% discount. What was the original price?
- $140
- $144
- $150 (Correct answer)
- $160
Correct answer: $150
If 80% of original = $120, then original = 120 ÷ 0.8 = $150.
Question 3: Plot the point (3, -2) on a Cartesian plane. Which quadrant is it in?
- First quadrant
- Second quadrant
- Third quadrant
- Fourth quadrant (Correct answer)
Correct answer: Fourth quadrant
(3, -2): x is positive and y is negative. This is the fourth quadrant (bottom right).
Question 4: Solve: x/3 = 5
- x = 8
- x = 2
- x = 15 (Correct answer)
- x = 12
Correct answer: x = 15
Multiply both sides by 3: x = 5 × 3 = 15.
Question 5: What is 2.45 rounded to 1 decimal place?
- 2.4
- 2.5 (Correct answer)
- 2.6
- 3.0
Correct answer: 2.5
Look at the second decimal place: 5. Since it is 5 or more, round up the first decimal place: 2.5.
Question 6: What type of angle is 135°?
- Acute
- Right
- Obtuse (Correct answer)
- Reflex
Correct answer: Obtuse
An obtuse angle is between 90° and 180°. Since 135° is between 90° and 180°, it is obtuse.
N-Level Mathematics 4
What is the volume of a cube with side length 3 cm?