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Question 701

RRB JE 2026• Technical Abilities

Which statement best explains how ionic radius varies with charge and electronic configuration of ions?

  1. AOption (a)

    Electronic configuration plays no role in determining ionic size

  2. BOption (b)

    Higher positive charge leads to smaller ionic radius due to attraction

  3. COption (c)

    Ionic charge has no influence on magnitude of ionic radius

  4. DOption (d)

    Ionic radius remains constant regardless of ionic charge or structure

View answer & explanation

Correct answer

Answer: (a)A.

Electronic configuration plays no role in determining ionic size

Explanation not yet available.

Question 702

RRB JE 2026• Technical Abilities

The existence of cut-in voltage in a diode is mainly due to the presence of __________.

  1. AOption (a)

    Neutral atoms without charges

  2. BOption (b)

    External magnetic field only

  3. COption (c)

    Depletion barrier potential

  4. DOption (d)

    Infinite conductivity

View answer & explanation

Correct answer

Answer: (a)A.

Neutral atoms without charges

Explanation not yet available.

Question 703

RRB JE 2026• Technical Abilities

A food processing company must select materials for storage tanks used for acidic foods. Which approach is most suitable to minimize corrosion and ensure long-term safety?

  1. AOption (a)

    Painting the interior with non-metallic colors

  2. BOption (b)

    Using stainless steel for constructing the tanks

  3. COption (c)

    Placing silica gel packets inside the tanks

  4. DOption (d)

    Attaching aluminum strips to the tank walls

View answer & explanation

Correct answer

Answer: (a)A.

Painting the interior with non-metallic colors

Explanation not yet available.

Question 704

RRB JE 2026• Technical Abilities

Radioactive decay cannot be predicted exactly for a single nucleus because the process is __________.

  1. AOption (a)

    Controlled by temperature only

  2. BOption (b)

    Random in nature

  3. COption (c)

    Completely deterministic

  4. DOption (d)

    Dependent on chemical state always

View answer & explanation

Correct answer

Answer: (a)A.

Controlled by temperature only

Explanation not yet available.

Question 705

RRB JE 2026• Technical Abilities

Which combination of objective and eyepiece focal lengths will result in the highest magnifying power for a simple astronomical telescope?

  1. AOption (a)

    Long focal length eyepiece and short focal length objective

  2. BOption (b)

    Short focal length eyepiece and short focal length objective

  3. COption (c)

    Short focal length eyepiece and long focal length objective

  4. DOption (d)

    Long focal length eyepiece and long focal length objective

View answer & explanation

Correct answer

Answer: (a)A.

Long focal length eyepiece and short focal length objective

Explanation not yet available.

Question 706

RRB JE 2026• Technical Abilities

Two vectors have equal magnitudes. If the magnitude of their resultant is equal to the magnitude of either vector, what is the angle between the two vectors?

  1. AOption (a)

    60∘

  2. BOption (b)

    120∘

  3. COption (c)

    30∘

  4. DOption (d)

    180∘

View answer & explanation

Correct answer

Answer: (a)A.

60∘

Explanation not yet available.

Question 707

RRB JE 2026• Technical Abilities

Which statement best explains why exchange energy stabilizes half-filled subshell configurations?

  1. AOption (a)

    Exchange energy has no role in determining electronic stability

  2. BOption (b)

    Opposite spins create stronger exchange interactions increasing stability

  3. COption (c)

    Stability depends only on nuclear attraction to electrons

  4. DOption (d)

    Parallel spins allow exchange interactions increasing configuration stability

View answer & explanation

Correct answer

Answer: (a)A.

Exchange energy has no role in determining electronic stability

Explanation not yet available.

Question 708

RRB JE 2026• Technical Abilities

The magnetic field lines around an infinitely long straight current-carrying wire are _________.

  1. AOption (a)

    Straight parallel lines only

  2. BOption (b)

    Radially outward directed lines

  3. COption (c)

    Elliptical closed trajectories

  4. DOption (d)

    Concentric circular paths

View answer & explanation

Correct answer

Answer: (a)A.

Straight parallel lines only

Explanation not yet available.

Question 709

RRB JE 2026• Technical Abilities

A metal rod is tightly fitted between two rigid walls at room temperature. If the temperature increases, which outcome is most likely due to thermal expansion of solids?

  1. AOption (a)

    The rod will remain unaffected by the temperature change.

  2. BOption (b)

    The rod will be under tensile stress and stretch.

  3. COption (c)

    The rod will experience compressive stress and may buckle.

  4. DOption (d)

    The rod will freely increase in length without stress.

View answer & explanation

Correct answer

Answer: (a)A.

The rod will remain unaffected by the temperature change.

Explanation not yet available.

Question 710

RRB JE 2026• Technical Abilities

A car is at rest with its horn continuously sounding. If a person walks toward the car, how does the frequency of the sound heard by the person change?

  1. AOption (a)

    The frequency remains unchanged

  2. BOption (b)

    The frequency fluctuates continuously

  3. COption (c)

    The frequency decreases

  4. DOption (d)

    The frequency increases

View answer & explanation

Correct answer

Answer: (a)A.

The frequency remains unchanged

Explanation not yet available.
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