RRB Group D 2025 Question Paper (10-Aug-2026) (Shift 1)

Question 1

An object is placed at the center of curvature of a concave mirror. If the mirror is now partially covered with an opaque material, what change will occur in the image?

Accepted Answer

The image will remain at the same position but will become less bright

Answer

The image will shift closer to the mirror and become smaller

Answer

The image will disappear completely

Answer

The image will move farther from the mirror and become inverted

Question 2

In a chemical reaction, 12g of carbon reacts completely with 32g of oxygen to form carbon dioxide. If only 40g of carbon dioxide is collected, which of the following is the correct conclusion based on the Law of Conservation of Mass?

Accepted Answer

Carbon dioxide gas escaped during the reaction, so mass was not fully collected.

Answer

The reaction is incomplete because 4g of mass is unaccounted for.

Answer

The law of conservation of mass does not apply to gas formation.

Answer

Mass is always lost as energy, so the final mass decreases.

Question 3

Which of the following pairs of atoms are isobars?

Accepted Answer

$^{40}_{20}\text{Ca}$ and $^{40}_{18}\text{Ar}$

Answer

$^{35}_{17}\text{Cl}$ and $^{37}_{17}\text{Cl}$

Answer

$^{23}_{11}\text{Na}$ and $^{24}_{12}\text{Mg}$

Answer

$^{14}_{6}\text{C}$ and $^{12}_{6}\text{C}$

Question 4

Which process in animals takes place in the absence of oxygen and releases a smaller amount of energy?

Accepted Answer

Anaerobic respiration

Answer

Transpiration

Answer

Aerobic respiration

Answer

Photosynthesis

Question 5

A weather balloon rises from sea level to 15 km altitude. The point of the temperature reverse from decreasing to increasing, and reason for this change is:

Accepted Answer

At the start of the stratosphere due to ozone absorption of UV

Answer

At the midpoint of the troposphere due to nitrogen distribution

Answer

At the base of the mesosphere due to air pressure changes

Answer

At the top of the troposphere due to greenhouse gases

RRB Group D 2025 Question Paper (10-Aug-2026) (Shift 1)

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