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Question 691

RRB JE 2026• Technical Abilities

Read the below Assertion and Reason and choose the correct option.

Assertion (A): Bleaching powder is used as an oxidising agent in chemical industries.

Reason (R): Bleaching powder is produced by the action of chlorine on dry slaked lime.

  1. AOption (a)

    Both A and R are true, and R is the correct explanation of A

  2. BOption (b)

    A is true, but R is false

  3. COption (c)

    A is false, but R is true

  4. DOption (d)

    Both A and R are true, but R is not the correct explanation of A

View answer & explanation

Correct answer

Answer: (a)A.

Both A and R are true, and R is the correct explanation of A

Explanation not yet available.

Question 692

RRB JE 2026• Technical Abilities

A particle moves with uniform acceleration and has an initial velocity u. It covers distances s and 2s in two successive equal time intervals t. What is the acceleration of the particle?

  1. AOption (a)

    \( \frac{3s}{4t^2} \)

  2. BOption (b)

    \( \frac{s}{t^2} \)

  3. COption (c)

    \( \frac{2s}{t^2} \)

  4. DOption (d)

    \( \frac{2s}{3t^2} \)

View answer & explanation

Correct answer

Answer: (a)A.

\( \frac{3s}{4t^2} \)

Explanation not yet available.

Question 693

RRB JE 2026• Technical Abilities

Stoichiometry in chemistry is mainly concerned with calculation of which of the following?

  1. AOption (a)

    Reactions without using balanced chemical equation relationships

  2. BOption (b)

    Reactant and product amounts using balanced chemical equations

  3. COption (c)

    Calculations ignoring mole concept in chemical reaction analysis

  4. DOption (d)

    Physical properties of substances without chemical reaction calculations

View answer & explanation

Correct answer

Answer: (a)A.

Reactions without using balanced chemical equation relationships

Explanation not yet available.

Question 694

RRB JE 2026• Technical Abilities

You have three test tubes: one with dilute HCl, one with NaOH solution, and one with distilled water. Using both red and blue litmus papers, which observation correctly identifies the test tube containing the acidic solution?

  1. AOption (a)

    Turns both red and blue litmus blue

  2. BOption (b)

    No change in red, turns blue litmus red

  3. COption (c)

    No change in both red and blue litmus

  4. DOption (d)

    Turns red litmus blue

View answer & explanation

Correct answer

Answer: (a)A.

Turns both red and blue litmus blue

Explanation not yet available.

Question 695

RRB JE 2026• Technical Abilities

If a hydrocarbon undergoes oxidation in the laboratory and a sweet-smelling liquid is produced, which class of compound is most likely formed?

  1. AOption (a)

    An ester is most likely formed during the reaction

  2. BOption (b)

    A ketone is most likely formed during the reaction

  3. COption (c)

    An amide is most likely formed during the reaction

  4. DOption (d)

    An alkene is most likely formed during the reaction

View answer & explanation

Correct answer

Answer: (a)A.

An ester is most likely formed during the reaction

Explanation not yet available.

Question 696

RRB JE 2026• Technical Abilities

Which statement correctly explains the relationship between pH and hydronium ion concentration?

  1. AOption (a)

    Higher the hydronium ion concentration, lower is the pH

  2. BOption (b)

    Lower the hydronium ion concentration, lower is the pH

  3. COption (c)

    Higher the hydronium ion concentration, higher is the pH

  4. DOption (d)

    pH is independent of ion concentration

View answer & explanation

Correct answer

Answer: (a)A.

Higher the hydronium ion concentration, lower is the pH

Explanation not yet available.

Question 697

RRB JE 2026• Technical Abilities

Which equation below is NOT dimensionally consistent?

  1. AOption (a)

    s = vt

  2. BOption (b)

    s = ut + (1/2) at2

  3. COption (c)

    s = (v2 - u2)/2a

  4. DOption (d)

    s = ut2 + (1/2) at

View answer & explanation

Correct answer

Answer: (a)A.

s = vt

Explanation not yet available.

Question 698

RRB JE 2026• Technical Abilities

A particle of mass m starts from rest and moves with constant acceleration 'a'. After travelling a distance 's', what is its kinetic energy?

  1. AOption (a)

    \(\frac{1}{2}\) mas

  2. BOption (b)

    \(\frac{1}{2}\) ma2

  3. COption (c)

    mas

  4. DOption (d)

    2 mas

View answer & explanation

Correct answer

Answer: (a)A.

\(\frac{1}{2}\) mas

Explanation not yet available.

Question 699

RRB JE 2026• Technical Abilities

When a hot metal block is placed in a cooler liquid inside a calorimeter, which property of the metal primarily determines how readily heat is conducted through the block to its surface?

  1. AOption (a)

    The absolute volume metrics of the metal block

  2. BOption (b)

    The thermal conductivity of the metal block

  3. COption (c)

    The specific heat capacity of the metal block

  4. DOption (d)

    The internal density profile of the metal block

View answer & explanation

Correct answer

Answer: (a)A.

The absolute volume metrics of the metal block

Explanation not yet available.

Question 700

RRB JE 2026• Technical Abilities

Why are half-filled orbitals considered more stable?

  1. AOption (a)

    Stability does not depend on electron arrangement

  2. BOption (b)

    Equal electron distribution reduces repulsion in orbitals

  3. COption (c)

    Half-filled orbitals are always less stable

  4. DOption (d)

    Unequal electron distribution increases atomic instability

View answer & explanation

Correct answer

Answer: (a)A.

Stability does not depend on electron arrangement

Explanation not yet available.
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