RRB Technician Grade I (Signal) 19 Dec 2024 Shift 2 – Question Paper

Concept: Major sporting events and their host countries.

1. The 2023 FIH Men's Hockey World Cup (15th edition) was hosted by India in Odisha, at Bhubaneswar (Kalinga Stadium) and Rourkela (Birsa Munda Stadium), from 13 to 29 January 2023.
2. Germany won the title, beating Belgium in the final on penalties; India finished 9th.
3. India had also hosted the previous edition in 2018 (Bhubaneswar), making it the first country to host two consecutive editions.

Yaad rakhein: Hockey World Cup 2018 and 2023 – both in Odisha, India; winners Belgium (2018) and Germany (2023).

Answer: (D) India

Concept: Build the family tree step by step from the given relations and then read off the required relation.

1. K is the husband of S, and S is the mother of B → K is the father of B.
2. B is the sister of T → T is also a child of S and K.
3. T is the brother of E → T is male.
4. So T is the male child of K, i.e. T is the son of K. (E and Q are not needed for the answer.)

Trick: First find the gender of the person asked about (brother → male), then find the parent link; "male child of a man" = son.

Answer: (C) Son

Concept: Full forms of memory technologies.

1. DDR SDRAM = Double Data Rate Synchronous Dynamic Random Access Memory.
2. "Synchronous" means the memory works in step with the system clock; "Double Data Rate" means data is transferred on both the rising and falling edges of the clock, doubling the bandwidth of ordinary SDRAM.
3. Options with "Systematic" or "Dynamic Data Rate" are not real terms.

Yaad rakhein: SDRAM = Synchronous DRAM; DDR = Double Data Rate (data on both clock edges). Versions: DDR, DDR2, DDR3, DDR4, DDR5.

Answer: (C) Double Data Rate Synchronous Dynamic Random Access Memory

Concept: $n$th term of an A.P.: $a_n=a+(n-1)d$. The difference of two terms gives $d$ directly: $a_m-a_n=(m-n)d$.

1. $a_{28}-a_{15}=416-208=208=13d$ → $d=16$.
2. $a_{49}=a_{28}+(49-28)d=416+21\times 16=416+336=752$.
3. Check via $a$: $a=208-14\times 16=-16$; $a_{49}=-16+48\times 16=752$ ✓.

Trick: Jump directly from a known term: $a_{49}=a_{28}+21d$ – no need to find $a$.

Answer: (C) 752

Concept: Force per unit length between two parallel conductors: $\frac{F}{L}=\frac{{\mu }_0{I}_1{I}_2}{2\pi d}$, i.e. $F\propto \frac{I_1{I}_2}{d}$ for fixed length.

1. Initially $I_1=I_2=I$, distance $d$: $F_1=3\text{N}$.
2. New currents $2I$ and $2I$ → product becomes $4$ times; distance $\frac{d}{2}$ → force becomes $2$ times.
3. $F_2=3\times 4\times 2=24\text{N}$.

Trick: Doubling both currents ×4, halving the gap ×2 → total ×8. Like currents attract, opposite currents repel.

Answer: (B) 24 N