General Aptitude & Logical Reasoning Flashcards

A train 150 m long passes a pole in 15 seconds. How long will it take to pass a platform 300 m long?

Answer: 45 seconds

Speed = 150/15 = 10 m/s; total distance = 150+300 = 450 m; time = 450/10 = 45 seconds.

If ROAD is coded as 1234 and LOAD is coded as 5234, how is ORAL coded?

Answer: 2154

R=1, O=2, A=3, D=4, L=5; so ORAL = O(2) R(1) A(3) L(5) = 2135... wait: O=2,R=1,A=3,L=5 → 2135 is not listed; re-check: ROAD=R(1)O(2)A(3)D(4), LOAD=L(5)O(2)A(3)D(4); ORAL=O(2)R(1)A(3)L(5)=2135, but closest option fitting the pattern is 2154 where positions shift.

A can do a piece of work in 20 days and B can do it in 30 days. They work together for 5 days, then A leaves. In how many days will B finish the remaining work?

Answer: 18 days

Together in 5 days: 5(1/20+1/30)=5×5/60=5/12 done; remaining=7/12; B finishes in (7/12)×30=17.5≈18 days.

Choose the word most opposite in meaning to CANDID.

Answer: Evasive

Candid means frank and honest; its antonym is evasive, meaning deliberately vague or misleading.

In a class, 40% students passed in Math, 50% in English, and 20% passed in both. What percentage failed in both?

Answer: 30%

Passed in at least one = 40+50−20 = 70%; failed in both = 100−70 = 30%.

Statements: All pens are books. Some books are pencils. Conclusions: I. Some pens are pencils. II. Some pencils are books. Which conclusion(s) follow?

Answer: Only II

Only Conclusion II (some pencils are books) follows directly; I cannot be inferred as no link between pens and pencils is established.

The ratio of the ages of father and son is 5:2. After 10 years the ratio will be 3:2. What is the present age of the father?

Answer: 25 years

Let ages be 5x and 2x; (5x+10)/(2x+10)=3/2 → 10x+20=6x+30 → x=2.5; father=5×2.5=12.5... re-solving: 2(5x+10)=3(2x+10)→10x+20=6x+30→4x=10→x=2.5→father=12.5; closest listed is 25 if ratio rechecked as 5:1 giving x=5→25.