RRB Technician Grade III 24 Dec 2024 Shift 3 – Question Paper

Concept: The expression has the form $a^2-2ab+b^2=(a-b{)}^2$.

1. Here $a=75$, $b=25$.
2. Value $=(75-25{)}^2={50}^2$.
3. ${50}^2=2500$.

Trick: Spot the middle term $-2\times 75\times 25$ — it signals $(a-b{)}^2$, no need to multiply each term.

Answer: (D) 2500

Concept: Fix the definite positions first (7 boxes, top to bottom).

1. Only X above Y → X is top ($7$th), Y is $6$th.
2. Only two above A → A is $5$th; B just below → $4$th.
3. Z just above C: Z cannot be $3$rd from bottom, so Z $=2$nd, C $=1$st; L takes $3$rd.
4. Between L ($3$rd) and X ($7$th): Y, A, B $=3$ boxes.

Trick: Start with “only” clauses — they lock the top positions immediately.

Answer: (D) Three

Concept: In a double displacement reaction, two compounds exchange their ions to form two new compounds.

1. Reactants: $\mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4$ and $\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}$.
2. $\mathrm{C}{\mathrm{u}}^{2+}$ pairs with $\mathrm{O}{\mathrm{H}}^{-}$ and $\mathrm{N}{\mathrm{a}}^{+}$ pairs with $\mathrm{S}{\mathrm{O}}_4^{2-}$.
3. $\mathrm{C}\mathrm{u}\mathrm{S}{\mathrm{O}}_4+2\mathrm{N}\mathrm{a}\mathrm{O}\mathrm{H}\to \mathrm{C}\mathrm{u}(\mathrm{O}\mathrm{H}{)}_2\downarrow +\mathrm{N}{\mathrm{a}}_2\mathrm{S}{\mathrm{O}}_4$ – ions swapped, blue precipitate forms.

Trick: Pattern $\mathrm{A}\mathrm{B}+\mathrm{C}\mathrm{D}\to \mathrm{A}\mathrm{D}+\mathrm{C}\mathrm{B}$ means double displacement.

Answer: (C) Double displacement reaction

Concept: The Carriage of Goods by Sea Bill, 2024 seeks to replace the Indian Carriage of Goods by Sea Act, 1925.

1. It was introduced in the Lok Sabha on 9 August 2024 by the Minister of Ports, Shipping and Waterways, Sarbananda Sonowal.
2. It deals with the responsibilities, liabilities and rights of carriers of goods by sea.

Yaad rakhein: Shipping-related Bills of 2024 also include the Bills of Lading Bill and Merchant Shipping Bill.

Answer: (B) 9 August 2024