Browse the questions, answers and explanations for SSC CGL in 2021.
3 questions · Page 1 of 1
Which gas is absorbed and which is released by plants during respiration?
O₂ absorbed, CO₂ released
CO₂ absorbed, O₂ released
N₂ absorbed, O₂ released
O₂ absorbed, N₂ released
Correct Answer: A — O₂ absorbed, CO₂ released
Explanation:
During respiration, plants (like animals) absorb O₂ and release CO₂. This is the reverse of photosynthesis.
Noble gases are placed in which group of the periodic table?
Group 1
Group 2
Group 17
Group 18
Correct Answer: D — Group 18
Explanation:
Noble gases (He, Ne, Ar, Kr, Xe, Rn) are in Group 18 and are chemically inert due to complete electron shells.
What is the approximate speed of sound in air at 0°C?
232 m/s
331 m/s
440 m/s
3 × 10⁸ m/s
Correct Answer: B — 331 m/s
Explanation:
The speed of sound in air at 0°C is approximately 331 m/s. It increases with temperature.
