A student lists the following stages in the formation of the present-day atmosphere of the Earth: (i) loss of the primordial atmosphere of hydrogen and helium, (ii) release of gases from the interior through degassing, (iii) formation of oceans by condensation of water vapour, (iv) build-up of oxygen through photosynthesis. Which is the correct chronological order?

(i) → (ii) → (iii) → (iv)

(i) → (iii) → (ii) → (iv)

(iii) → (i) → (ii) → (iv)

(ii) → (i) → (iv) → (iii)

The early earth was a hot, rocky body, yet today it has a layered internal structure with a dense core and lighter outer layers. Which process best explains how this layering developed?

Differentiation, in which heavier materials such as iron sank to the centre while lighter materials rose towards the surface

Condensation of water vapour, which pushed the heavier rocks upward

Accretion, in which lighter planetesimals piled up over a heavier crust

Outgassing, in which gases escaped from the interior and settled into layers

Chapter testGeographyIncluded in the seriesTest 5 of 16

CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth

CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth is an online chapter test in the CBSE Class 11 Humanities pattern, covering The Origin and Evolution of the Earth. Attempt it on SeatBeat with a timer like the real exam, then see a detailed solution for every question and your score and weak-topic analysis.

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Topics in this test

Topic	Subject	Questions
The Origin and Evolution of the Earth	Geography	30

Difficulty: 8 medium · 22 hard

The Origin and Evolution of the Earth MCQ questions with answers

The first 3 of 30 questions. Unlock the series for the rest, each with a solution.

Q1. A student lists the following stages in the formation of the present-day atmosphere of the Earth: (i) loss of the primordial atmosphere of hydrogen and helium, (ii) release of gases from the interior through degassing, (iii) formation of oceans by condensation of water vapour, (iv) build-up of oxygen through photosynthesis. Which is the correct chronological order?
एक विद्यार्थी पृथ्वी के वर्तमान वायुमंडल के निर्माण के निम्नलिखित चरणों को सूचीबद्ध करता है: (i) हाइड्रोजन और हीलियम के आदिम वायुमंडल का लोप, (ii) आंतरिक भाग से गैसों का विगैसीकरण (degassing) द्वारा निष्कासन, (iii) जलवाष्प के संघनन से महासागरों का निर्माण, (iv) प्रकाश-संश्लेषण के माध्यम से ऑक्सीजन का संचयन। सही कालानुक्रमिक क्रम कौन-सा है?
- A. (i) → (iii) → (ii) → (iv)
- B. (iii) → (i) → (ii) → (iv)
- C. (i) → (ii) → (iii) → (iv)
- D. (ii) → (i) → (iv) → (iii)
Solution
The early hydrogen-helium atmosphere was stripped away first, then degassing released gases, water vapour condensed to form oceans, and much later photosynthesis added oxygen.
प्रारंभिक हाइड्रोजन-हीलियम वायुमंडल सबसे पहले हट गया, फिर विगैसीकरण ने गैसों को मुक्त किया, जलवाष्प संघनित होकर महासागरों का निर्माण हुआ, और बहुत बाद में प्रकाश-संश्लेषण ने ऑक्सीजन जोड़ी।
Q2. The earth's early atmosphere, formed mainly by outgassing, contained water vapour, nitrogen, carbon dioxide, methane and ammonia. Which of the following was the 'odd one out', being largely absent from this early atmosphere?
मुख्यतः गैस-उत्सर्जन से बने पृथ्वी के आरंभिक वायुमंडल में जलवाष्प, नाइट्रोजन, कार्बन डाइऑक्साइड, मीथेन और अमोनिया थे। निम्नलिखित में से कौन-सा 'अपवाद' था, जो इस आरंभिक वायुमंडल में अधिकांशतः अनुपस्थित था?
- A. Free oxygen / मुक्त ऑक्सीजन
- B. Methane / मीथेन
- C. Ammonia / अमोनिया
- D. Carbon dioxide / कार्बन डाइऑक्साइड
Solution
Free oxygen was almost absent from the early atmosphere; it increased much later mainly through photosynthesis by living organisms.
मुक्त ऑक्सीजन आरंभिक वायुमंडल में लगभग अनुपस्थित थी; यह बहुत बाद में मुख्यतः जीवों द्वारा प्रकाश-संश्लेषण के माध्यम से बढ़ी।
Q3. The early earth was a hot, rocky body, yet today it has a layered internal structure with a dense core and lighter outer layers. Which process best explains how this layering developed?
आरंभिक पृथ्वी एक गर्म, चट्टानी पिंड थी, फिर भी आज इसकी आंतरिक संरचना परतदार है जिसमें एक सघन क्रोड और हल्की बाहरी परतें हैं। कौन-सी प्रक्रिया इस परतीकरण के विकास की सर्वोत्तम व्याख्या करती है?
- A. Condensation of water vapour, which pushed the heavier rocks upward / जलवाष्प का संघनन, जिसने भारी चट्टानों को ऊपर धकेला
- B. Accretion, in which lighter planetesimals piled up over a heavier crust / अभिवृद्धि (एक्रीशन), जिसमें हल्के ग्रहाणु एक भारी भूपर्पटी पर ढेर होते गए
- C. Outgassing, in which gases escaped from the interior and settled into layers / गैस-उत्सर्जन, जिसमें गैसें आंतरिक भाग से निकलकर परतों में बैठ गईं
- D. Differentiation, in which heavier materials such as iron sank to the centre while lighter materials rose towards the surface / विभेदन (डिफरेंशिएशन), जिसमें लोहे जैसे भारी पदार्थ केंद्र की ओर धँस गए जबकि हल्के पदार्थ सतह की ओर उठ गए
Solution
When the earth was hot and partly molten, heavier materials like iron sank towards the centre while lighter materials rose, a sorting known as differentiation.
जब पृथ्वी गर्म और आंशिक रूप से पिघली हुई थी, तब लोहे जैसे भारी पदार्थ केंद्र की ओर धँस गए जबकि हल्के पदार्थ ऊपर उठ गए; इस छँटाई को विभेदन (डिफरेंशिएशन) कहते हैं।

Frequently asked questions

How many questions are in the CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth?

30 questions for 30 marks, to be answered in 20 minutes.

Is there negative marking in the CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth?

No — wrong answers are not penalised in this test.

Which topics does the CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth cover?

The Origin and Evolution of the Earth (30 questions).

Is the CBSE Class 11 Humanities Geography · Ch 2: The Origin and Evolution of the Earth free?

It is part of the CBSE Class 11 Humanities (Arts) Test Series 2027 — Chapter-wise + Full Tests (16 tests, ₹199). You can first try Economics · Ch 1: Introduction for free.

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