NEET UG Properties of Matter & Heat: Kinetic Theory of Gases – Chapter Test

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Difficulty: 7 medium · 13 hard

Kinetic Theory of Gases MCQ questions with answers

The first 3 of 20 questions. Unlock the series for the rest, each with a solution.

1. Q1. Which one of the following gases is monatomic?

   निम्नलिखित में से कौन-सी गैस एकपरमाणुक है?

   • A. CO₂
   • B. He
   • C. O₂
   • D. N₂
   Solution

   Helium is a noble gas existing as single atoms (monatomic); N₂ and O₂ are diatomic and CO₂ is triatomic.

   हीलियम एक उत्कृष्ट गैस है जो एकल परमाणुओं के रूप में विद्यमान रहती है (एकपरमाणुक); N₂ और O₂ द्विपरमाणुक हैं तथा CO₂ त्रिपरमाणुक है।

2. Q2. If the absolute temperature of a fixed mass of ideal gas is doubled, the rms speed of its molecules becomes:

   यदि एक निश्चित द्रव्यमान की आदर्श गैस का परम तापमान दोगुना कर दिया जाए, तो इसके अणुओं की rms चाल हो जाती है:

   • A. √2 times the original / मूल का √2 गुना
   • B. 4 times the original / मूल का 4 गुना
   • C. 2√2 times the original / मूल का 2√2 गुना
   • D. 2 times the original / मूल का 2 गुना
   Solution

   Since v_rms ∝ √T, doubling T multiplies the rms speed by √2.

   क्योंकि v_rms ∝ √T, T को दोगुना करने से rms चाल √2 गुना हो जाती है।

3. Q3. At the same temperature, the ratio of the rms speed of hydrogen molecules (molar mass 2 g mol⁻¹) to that of oxygen molecules (molar mass 32 g mol⁻¹) is:

   समान तापमान पर, हाइड्रोजन अणुओं (मोलर द्रव्यमान 2 g mol⁻¹) की rms चाल का ऑक्सीजन अणुओं (मोलर द्रव्यमान 32 g mol⁻¹) की rms चाल से अनुपात है:

   • A. 0.25
   • B. 2
   • C. 4
   • D. 16
   Solution

   v_rms ∝ 1/√M, so the ratio is √(32/2) = √16 = 4.

   v_rms ∝ 1/√M, अतः अनुपात √(32/2) = √16 = 4 है।

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