NTPC & RRB Maths & Reasoning Quiz
Medium-level multiple-choice quiz focused on problem-solving strategies, numerical reasoning, and logical frameworks relevant to NTPC and RRB exams. Each question emphasizes a transferable concept or mindset.
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Quiz Questions & Answers
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Question 1: Which strategy best reduces calculation time when solving repeated percentage-change problems?
Round percentages to nearest integer before each step
Always convert percentages to fractions with denominator 100
Convert everything into decimals and add them
Use successive multiplier (1 ± p/100) repeatedly
Question 2: If two trains travel towards each other on parallel tracks, which principle yields the quickest time-to-meet calculation?
Compute each train's position equation and equate them
Add relative speeds and divide initial distance by the sum
Use average speed of the two trains to estimate time
Double the slower train's speed then compute time
Question 3: What mindset helps most when approaching a complex syllogism in reasoning tests?
Assume unspecified elements are true
Apply algebraic manipulation immediately
Translate statements into Venn or set relations before concluding
Rely on intuition about typical cases
Question 4: A rectangular field's length is increased by 20% and width decreased by 20%. Which insight quickly predicts area change?
Area decreases by 4%
Area stays the same
Area increases by 40%
Area decreases by 20%
Question 5: When estimating large sums under time pressure, which technique preserves accuracy while saving time?
Average all numbers then multiply by count
Discard small numbers under a threshold
Always compute exact value step-by-step
Group numbers into roundable clusters and adjust remainders
Question 6: Which pattern-recognition approach helps most in number series questions?
Only check prime factors for every term
Check differences and ratios, then test alternating subsequences
Assume pattern is always arithmetic
Apply random polynomial fit to three terms
Question 7: In time-speed-distance problems with curves, which core assumption simplifies most exam tasks?
Treat distances and speeds along straight equivalent paths unless stated otherwise
Assume equal time splits for all segments
Ignore relative motion and compute individually
Always convert speeds to acceleration terms
Question 8: Which checks prevent careless errors when solving algebraic equations under exam time limits?
Substitute solution back and verify units or parity quickly
Trust symbolic simplification without re-checking
Only check if the answer looks unusual
Always re-solve from scratch rather than check