RRB NTPC Undergraduate CBT 1 18 Jun 2026 Shift 3 – Question Paper

Concept: Industries are classified by capital invested, labour and output; large-scale industries need huge capital and heavy machinery.

1. Steel plants (e.g. Bhilai, Bokaro, Jamshedpur) need very high investment, huge raw material and thousands of workers → large scale.
2. Pottery and handloom are cottage/small-scale; food processing is largely small and medium scale.

Yaad rakhein: Iron & steel is called the ‘basic’ or ‘key’ industry — a classic large-scale industry.

Answer: (A) Steel plants

Concept: Write every term with the same base; then $a^m\times a^n=a^{m+n}$ and ${\left(\frac{a}{b}\right)}^{-n}={\left(\frac{b}{a}\right)}^n$.

1. ${\left(\frac{7}{26}\right)}^{11}={\left(\frac{26}{7}\right)}^{-11}$
2. LHS $={\left(\frac{26}{7}\right)}^{5-11+19}={\left(\frac{26}{7}\right)}^{13}={\left(\frac{7}{26}\right)}^{-13}$
3. So $9m+17=-13\Rightarrow 9m=-30\Rightarrow m=-\frac{10}{3}$

Trick: Flip the base and the sign of the power flips: just add/subtract the powers of $\frac{26}{7}$ and change sign.

Answer: (A) $-\frac{10}{3}$

Concept: Letters common to two words share the common codes (order is jumbled).

1. CHIN → {9, 4, 1, 3}; NICE → {2, 3, 1, 9}.
2. Common letters C, I, N ↔ common codes 9, 1, 3.
3. Left-over in NICE: E ↔ 2 (and H ↔ 4).

Trick: Remove common codes; the leftover code belongs to the leftover letter.

Answer: (D) 2