Railway RRB / NTPC — MCQ Practice Questions & Answers

Question 1

A person travels 60 km by train at 40 km/h and 30 km by bus at 30 km/h. What is the average speed for the entire journey?

Accepted Answer

Correct answer: C. 36 km/h — Time by train = 1.5 h; Time by bus = 1 h; Total distance = 90 km; Total time = 2.5 h; Average = 90/2.5 = 36 km/h

Answer

A. 32 km/h

Answer

B. 35 km/h

Answer

D. 38 km/h

Question 2

If x² - 5x + 6 = 0, what are the values of x?

Accepted Answer

Correct answer: A. 2 and 3 — x² - 5x + 6 = (x-2)(x-3) = 0; x = 2 or x = 3

Answer

B. 2 and 4

Answer

C. -2 and -3

Answer

D. 1 and 6

Question 3

A discount of 10% is given on an item, and then another 15% discount is applied. What is the overall discount percentage?

Accepted Answer

Correct answer: C. 23.5% — After 10% discount: 90%; After 15% on 90%: 90% × 85% = 76.5%; Overall discount = 23.5%

Answer

A. 24%

Answer

B. 25%

Answer

D. 26.5%

Question 4

Two pipes can fill a tank in 12 hours and 15 hours respectively. If both are opened together, in how many hours will the tank be filled?

Accepted Answer

Correct answer: A. 6.67 hours — Work rate = 1/12 + 1/15 = 5/60 + 4/60 = 9/60 = 3/20; Time = 20/3 ≈ 6.67 hours

Answer

B. 7 hours

Answer

C. 7.5 hours

Answer

D. 8 hours

Question 5

A sum of money becomes Rs. 1800 in 2 years and Rs. 2100 in 4 years at simple interest. What is the principal?

Accepted Answer

Correct answer: C. Rs. 1500 — Interest in 2 years = A₂ - A₄/2 = 1800 - 1050 = 750; Interest per year = 375; Principal = 1800 - 750 = 1500

Answer

A. Rs. 1200

Answer

B. Rs. 1350

Answer

D. Rs. 1600

Railway RRB / NTPC - MCQ Practice Questions