RRB NTPC Graduate CBT 1 27 Mar 2026 Shift 1 – Question Paper

Concept: Greenhouse gases trap outgoing infrared radiation; the ones whose concentration is rising due to human activity are the main concern.

1. Carbon dioxide (fossil fuels), methane (agriculture, livestock, landfills) and nitrous oxide (fertilisers) are the three main long-lived greenhouse gases tracked by IPCC/WMO.
2. Argon, oxygen and nitrogen make up ~99% of air but are not greenhouse gases – they do not absorb infrared radiation.

Yaad rakhein: Any option containing oxygen, nitrogen or argon is wrong for a greenhouse-gas question.

Answer: (B) Carbon dioxide, methane, nitrous oxide

Concept: Fix the marked price as the base, find the cost price from the first sale, then compare the second selling price with that cost price.

1. Let marked price $M=130$ (a number divisible by 13 and 10). First SP $=\frac{4}{13}\times 130=40$.
2. Loss $30\%$ means $\text{SP}=0.7\text{CP}$, so $\text{CP}=\frac{40}{0.7}=\frac{400}{7}$.
3. New SP $=60\%$ of $130=78$. Profit $=78-\frac{400}{7}=\frac{146}{7}$.
4. Profit$\%=\frac{146/7}{400/7}\times 100=\frac{146}{4}=36.5\%$.

Trick: Both sales use the same CP, so $\frac{{\text{SP}}_2}{{\text{SP}}_1}=\frac{100+p}{100-30}$: $\frac{78}{40}=\frac{100+p}{70}\Rightarrow p=36.5$.

Answer: (A) $36.5\%$

Concept: Treat the letters and the number separately; each follows its own fixed jump.

1. First letters: X(24), T(20), P(16), L(12) → each $-4$, next is H(8).
2. Inside each cluster the 2nd letter is first letter $-2$ and the 3rd is first letter $-1$: XVW, TRS, PNO, LJK → HFG.
3. Numbers: 26, 22, 18, 14 → $-4$ each, next $10$. (Also number = first letter position $+2$.)

Trick: In such series the number is usually tied to the first letter – here $26=24+2$, so for H it must be $8+2=10$.

Answer: (D) HFG 10