Search Previous Year Questions

Find real questions from previous competitive exam papers with answers and solutions.

Browse complete papers
9450 matching questions · Page 69
Clear

Question 681

RRB JE 2026• Technical Abilities

Read the following Assertion (A) and Reason (R) carefully and choose the correct option.

Assertion (A): Dry HCl gas does not show acidic behaviour.

Reason (R): HCl produces hydrogen ions only in the presence of water.

  1. AOption (a)

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

  2. BOption (b)

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

  3. COption (c)

    A is false, but R is true

  4. DOption (d)

    A is true, but R is false

View answer & explanation

Correct answer

Answer: (a)A.

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

Explanation not yet available.

Question 682

RRB JE 2026• Technical Abilities

A particle moves 8 m east, then 15 m north, and finally 8 m west. What is the ratio of the total distance travelled to the magnitude of the net displacement?

  1. AOption (a)

    16:15

  2. BOption (b)

    31:8

  3. COption (c)

    15:31

  4. DOption (d)

    31:15

View answer & explanation

Correct answer

Answer: (a)A.

16:15

Explanation not yet available.

Question 683

RRB JE 2026• Technical Abilities

Isotopes of the same element possess different atomic masses because they contain different numbers of ________.

  1. AOption (a)

    Positive ions in orbit

  2. BOption (b)

    Neutrons inside nucleus

  3. COption (c)

    Electrons in outer shell

  4. DOption (d)

    Protons inside nucleus

View answer & explanation

Correct answer

Answer: (a)A.

Positive ions in orbit

Explanation not yet available.

Question 684

RRB JE 2026• Technical Abilities

A chemistry student is asked to explain why ethanoic acid is often stored in tightly sealed bottles. Which property of ethanoic acid best justifies this storage practice?

  1. AOption (a)

    Ethanoic acid is volatile and can evaporate if not sealed tightly

  2. BOption (b)

    Ethanoic acid reacts with plastic to form toxic gases

  3. COption (c)

    Ethanoic acid decomposes into water and carbon dioxide quickly

  4. DOption (d)

    Ethanoic acid solidifies at room temperature when exposed to air

View answer & explanation

Correct answer

Answer: (a)A.

Ethanoic acid is volatile and can evaporate if not sealed tightly

Explanation not yet available.

Question 685

RRB JE 2026• Technical Abilities

Which combination of environmental factors would most likely accelerate the corrosion of an unprotected iron bridge?

  1. AOption (a)

    High humidity and presence of acidic pollutants

  2. BOption (b)

    Continuous sunlight with dry air exposure

  3. COption (c)

    Cold temperatures and low atmospheric pressure

  4. DOption (d)

    Low humidity and absence of pollutants

View answer & explanation

Correct answer

Answer: (a)A.

High humidity and presence of acidic pollutants

Explanation not yet available.

Question 686

RRB JE 2026• Technical Abilities

According to the Heisenberg uncertainty principle, what happens when the precision in measuring position increases?

  1. AOption (a)

    Measurements remain unaffected by uncertainty principle limits

  2. BOption (b)

    Both variables can be measured accurately simultaneously always

  3. COption (c)

    Greater precision in one variable leads to greater uncertainty in other

  4. DOption (d)

    Uncertainty decreases for both variables simultaneously

View answer & explanation

Correct answer

Answer: (a)A.

Measurements remain unaffected by uncertainty principle limits

Explanation not yet available.

Question 687

RRB JE 2026• Technical Abilities

Why is molality preferred over molarity in colligative property calculations under varying temperature conditions?

  1. AOption (a)

    Both molality and molarity remain unaffected by temperature variations

  2. BOption (b)

    Molarity remains unaffected by temperature changes unlike molality values

  3. COption (c)

    Molality remains unaffected by temperature changes unlike molarity values

  4. DOption (d)

    Molality depends directly on solution volume changes with temperature

View answer & explanation

Correct answer

Answer: (a)A.

Both molality and molarity remain unaffected by temperature variations

Explanation not yet available.

Question 688

RRB JE 2026• Technical Abilities

What do electron shells represent in atomic structure?

  1. AOption (a)

    All electrons have identical energy values

  2. BOption (b)

    Electrons move randomly without defined shells

  3. COption (c)

    Electron shells do not exist in atoms

  4. DOption (d)

    Electrons occupy fixed energy level shells

View answer & explanation

Correct answer

Answer: (a)A.

All electrons have identical energy values

Explanation not yet available.

Question 689

RRB JE 2026• Technical Abilities

Which statement correctly explains the modern periodic law of elements?

  1. AOption (a)

    Properties repeat periodically with increasing atomic number values

  2. BOption (b)

    Properties vary randomly without any periodic trend observed

  3. COption (c)

    Atomic number has no effect on chemical properties

  4. DOption (d)

    Properties depend only on atomic mass values of elements

View answer & explanation

Correct answer

Answer: (a)A.

Properties repeat periodically with increasing atomic number values

Explanation not yet available.

Question 690

RRB JE 2026• Technical Abilities

Which of the following statements correctly describe similarities between a bar magnet and a current-carrying solenoid?

  1. Both have North and South poles.

  2. Both produce a nearly uniform magnetic field inside.

  3. Both require permanent magnetic material only.

  4. Both follow the right-hand rule for determining the direction of the magnetic field.

  1. AOption (a)

    2 and 3 only

  2. BOption (b)

    1, 2, 3 and 4

  3. COption (c)

    1 and 2 only

  4. DOption (d)

    1 and 3 only

View answer & explanation

Correct answer

Answer: (a)A.

2 and 3 only

Explanation not yet available.
Page 69