About this quiz
Percentage, simple interest, ratio, average, series, coding-decoding and speed.
This Lok Sewa practice set has 10 multiple-choice questions (Subject: Maths and IQ · For: Kharidar, Nayab Subba, Section Officer · Level: Medium). Take the quiz above first; after that, use the study list below to revise every question with its correct answer and a short explanation.
Study list: all 10 questions with answers and explanations
What is 25% of 480?
- A) 100
- B) 120 ✔
- C) 140
- D) 96
Why: 25% = 1/4, so 480 ÷ 4 = 120.
What is the simple interest on Rs. 5,000 at 10% per annum for 3 years?
- A) Rs. 1,000
- B) Rs. 1,500 ✔
- C) Rs. 1,655
- D) Rs. 1,800
Why: SI = (P × R × T) ÷ 100 = (5000 × 10 × 3) ÷ 100 = Rs. 1,500.
Find the next number: 2, 6, 12, 20, 30, ?
- A) 40
- B) 42 ✔
- C) 44
- D) 36
Why: Differences are 4, 6, 8, 10, so the next difference is 12. 30 + 12 = 42.
What is the average of 12, 15, 18, 21 and 24?
- A) 16
- B) 18 ✔
- C) 19
- D) 20
Why: Sum = 90. Average = 90 ÷ 5 = 18.
A shopkeeper buys an item for Rs. 800 and sells it for Rs. 1,000. What is the profit percentage?
- A) 20%
- B) 22.5%
- C) 25% ✔
- D) 30%
Why: Profit = 200. Profit % = (200 ÷ 800) × 100 = 25%.
What is 15% of 600?
- A) 60
- B) 75
- C) 90 ✔
- D) 120
Why: 15% of 600 = (15 ÷ 100) × 600 = 90.
Divide 120 in the ratio 2 : 3. What is the larger part?
- A) 48
- B) 60
- C) 72 ✔
- D) 80
Why: Total parts = 5. Larger part = (3 ÷ 5) × 120 = 72.
A bus travels at 60 km per hour. How far does it go in 2.5 hours?
- A) 120 km
- B) 140 km
- C) 150 km ✔
- D) 160 km
Why: Distance = Speed × Time = 60 × 2.5 = 150 km.
Find the next number: 3, 9, 27, 81, ?
- A) 162
- B) 243 ✔
- C) 324
- D) 189
Why: Each number is multiplied by 3. 81 × 3 = 243.
If CAT is written as DBU, how is DOG written?
- A) EPH ✔
- B) EOH
- C) DPH
- D) FQI
Why: Each letter moves one step forward: D to E, O to P, G to H.