RRB Group D 2025 Question Paper (10-Aug-2026) (Shift 3)

Question 1

Which of the following statements best explains why striking a bell in a vacuum does NOT produce sound we can hear?

Accepted Answer

Sound needs a medium to travel from the bell to our ears

Answer

Light from the bell reaches our ears instead

Answer

The bell does not vibrate in a vacuum

Answer

The bell's material prevents sound from traveling

Question 2

Most of the energy fixed by autotrophs is ______ at each trophic level.

Accepted Answer

Lost to the environment as heat

Answer

Converted into organic matter

Answer

Utilized for locomotion

Answer

Stored in the organism

Question 3

Which of the following best describes the image formed by a concave mirror when the object is placed just beyond the focal point but before the center of curvature?

Accepted Answer

Real, inverted, and magnified

Answer

Virtual, inverted, and magnified

Answer

Virtual, upright, and diminished

Answer

Real, upright, and same size

Question 4

A patient with severe lung disease has reduced oxygen intake. Which cellular pathway is likely to be upregulated in their muscle cells during exertion, and what product accumulates as a result?

Accepted Answer

Anaerobic conversion of pyruvate to lactic acid, leading to lactic acid accumulation

Answer

Direct conversion of glucose to ATP without any by-products

Answer

Anaerobic conversion of pyruvate to ethanol and carbon dioxide

Answer

Aerobic breakdown of pyruvate to carbon dioxide and water

Question 5

The commonly used catalysts for hydrogenation reactions are _________ and _________.

Accepted Answer

palladium, nickel

Answer

nickel, sodium hydroxide

Answer

palladium, conc. sulphuric acid

Answer

conc. sulphuric acid, nickel

RRB Group D 2025 Question Paper (10-Aug-2026) (Shift 3)

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