πŸ“Š Math
Q. What is the perimeter of a square whose side is 21 cm?
  • (A) 72 cm
  • (B) 80 cm
  • (C) 84 cm
  • (D) 90 cm
πŸ’¬ Discuss
βœ… Correct Answer: (C) 84 cm

Explanation: Perimeter = 4 × 21 = 84 cm.

πŸ“Š Math
Q. The average of 52, 60, 68 and 80 is:
  • (A) 63
  • (B) 64
  • (C) 65
  • (D) 66
πŸ’¬ Discuss
βœ… Correct Answer: (C) 65

Explanation: (52 + 60 + 68 + 80) / 4 = 260 / 4 = 65.

πŸ“Š Math
Q. If the LCM of two numbers is 72 and their HCF is 6, one of the numbers is 18. What is the other?
  • (A) 20
  • (B) 22
  • (C) 24
  • (D) 30
πŸ’¬ Discuss
βœ… Correct Answer: (C) 24

Explanation: Product of numbers = LCM × HCF = 72 × 6 = 432 → 432 / 18 = 24.

πŸ“Š Math
Q. The sum of first 12 natural numbers is:
  • (A) 68
  • (B) 72
  • (C) 78
  • (D) 84
πŸ’¬ Discuss
βœ… Correct Answer: (C) 78

Explanation: n(n+1)/2 = 12×13/2 = 78.

πŸ“Š Math
Q. What is the selling price of an item for β‚Ή180 profit on a cost price of β‚Ή900?
  • (A) β‚Ή1000
  • (B) β‚Ή1050
  • (C) β‚Ή1080
  • (D) β‚Ή1120
πŸ’¬ Discuss
βœ… Correct Answer: (C) β‚Ή1080

Explanation: SP = CP + Profit = 900 + 180 = 1080.

πŸ“Š Math
Q. Which formula gives the simple interest (SI) on a principal P at rate R% for T years?
  • (A) SI = P + R + T
  • (B) SI = (P × R) + T
  • (C) SI = (P × R × T) / 100
  • (D) SI = P × (1 + R/100)^T
πŸ’¬ Discuss
βœ… Correct Answer: (C) SI = (P × R × T) / 100

Explanation: Correct: SI = (P × R × T) / 100 is the standard simple interest formula. Option1 and Option2 are dimensionally wrong. Option4 is the compound interest formula, not simple interest.

πŸ“Š Math
Q. What is the simple interest on Rs. 1000 at 5% per annum for 2 years?
  • (A) Rs. 50
  • (B) Rs. 100
  • (C) Rs. 200
  • (D) Rs. 150
πŸ’¬ Discuss
βœ… Correct Answer: (B) Rs. 100

Explanation: SI = (1000×5×2)/100 = (1000×10)/100 = 1000×0.1 = 100. Option1 (50) is for 1 year at 5%. Option3 & Option4 are too large.

πŸ“Š Math
Q. If principal is Rs. 1500, rate 4% per annum for 3 years, what is the total amount (principal + SI)?
  • (A) Rs. 1680
  • (B) Rs. 1620
  • (C) Rs. 1560
  • (D) Rs. 1740
πŸ’¬ Discuss
βœ… Correct Answer: (A) Rs. 1680

Explanation: SI = (1500×4×3)/100 = (1500×12)/100 = 180. Amount = 1500+180 = 1680. Option2 (1620) would be SI=120; Option3 (1560) SI=60; Option4 incorrect.

πŸ“Š Math
Q. Simple interest is Rs. 240 for 2 years at 6% per annum. What was the principal?
  • (A) Rs. 2000
  • (B) Rs. 1500
  • (C) Rs. 1200
  • (D) Rs. 1000
πŸ’¬ Discuss
βœ… Correct Answer: (A) Rs. 2000

Explanation: P = SI×100/(R×T) = 240×100/(6×2) = 24000/12 = 2000. Other options give wrong division results.

πŸ“Š Math
Q. If simple interest earned on Rs. 800 for 3 years is Rs. 120, what is the annual rate?
  • (A) 4%
  • (B) 5%
  • (C) 6%
  • (D) 7.5%
πŸ’¬ Discuss
βœ… Correct Answer: (B) 5%

Explanation: R = SI×100/(P×T) = 120×100/(800×3) = 12000/2400 = 5%. Option1 gives too small SI, Option3 & Option4 too large.

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