Placement Papers - MCQ Practice Questions

A firewall is a security barrier that filters network traffic based on predetermined rules to protect systems from unauthorized access

For independent events: P(A and B) = P(A) × P(B) = 0.4 × 0.3 = 0.12

Cost per apple = $\frac{50}{12}$ = Rs. 4.17. Selling price = Rs. 5. Profit = 5-4.17 = 0.83. Profit% = (0.$\frac{83}{4}$.17)×100 ≈ 20%.

Binary search has a time complexity of O(log n) because it divides the search space by half in each iteration. This works only on sorted arrays.

Let distance = d. Time = Distance/Speed. Going: d/60, Returning: d/40. Total: d/60 + d/40 = 10. Taking LCM: (2d + 3d)/120 = 10, so 5d/120 = 10, therefore d = 240 km.

The pattern is n(n+1) where n = 1,2,3,4,5,6... First term: 1×2=2, Second: 2×3=6, Third: 3×4=12, Fourth: 4×5=20, Fifth: 5×6=30, Sixth: 6×7=42.

Ephemeral (short-lived) is opposite to Permanent (long-lasting). Similarly, Verbose (using many words) is opposite to Concise (using few words). The analogy requires antonyms.

Rate of A = $\frac{1}{12}$, Rate of B = $\frac{1}{18}$. Combined rate = $\frac{1}{12}$ + $\frac{1}{18}$ = $\frac{5}{36}$. Time = $\frac{36}{5}$ = 7.2 hours

The number could be 11, 18, 25, 32, etc. (of form 7k+4). When divided by 11, remainders vary: 11→0, 18→7, 25→3, 32→10. Cannot determine uniquely.

Train + Bus = 60% + 30% = 90%. Walk = 10% = 20 km. Total = $\frac{20}{0}$.10 = 200 km

Let numbers be 2x, 3x, 5x. Sum = 2x + 3x + 5x = 10x = 100. x = 10. Largest = 5x = 50

Number = 12k + 5. When divided by 4: 12k + 5 = 4(3k) + 4 + 1 = 4(3k+1) + 1. Remainder = 1

Work is inversely proportional to number of workers. (5 × 12) = (10 × x), so x = 6 days

Cost Price = 10 × 50 = 500. Selling Price = 10 × 60 = 600. Profit = 100. Profit% = ($\frac{100}{500}$) × 100 = 20%

Roses are a subset of flowers, but we don't know which flowers are red. Some red flowers might not be roses.

R=4, O=5, S=6, E=7. Following alphabet position: P=1(9), E=7(8), T=2(9→2 with shift), A=1, L=4. PETAL = 89214

Benign means harmless, kind, or gentle. Friendly is the closest synonym

Verbose means using more words than necessary. Concise is its opposite—using few words

Quick Sort has O(n log n) average case complexity, which is optimal among comparison-based sorts

Both operands are integers, so integer division is performed: $\frac{10}{3}$ = 3 (truncated)