Star formation, formation of planets, and our solar system

01By what name is the early disk in the formation of the solar system known?

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Answer and explanation

Correct answer: A. Solar disk

The early rotating disk of gas and dust surrounding the young Sun is called the solar nebula or protoplanetary disk. In the wording of this question, “solar disk” is the intended name, so option A is correct. Material in this disk moved around the forming Sun, collided, and gradually accumulated into larger bodies that eventually became planets, moons, asteroids, and other objects. The forest, water, and rock cycles are Earth-system concepts and do not describe the disk from which the solar system developed. A precise scientific treatment may distinguish the solar nebula from the later protoplanetary disk, but among these choices A is the only relevant answer.

Practice questions

01By what name is the early disk in the formation of the solar system known?सौरमंडल के निर्माण में प्रारंभिक चक्र को किस नाम से जाना जाता है?

02Why can a comet show a tail when it comes near the Sun?धूमकेतु सूर्य के पास आने पर पूंछ क्यों दिखा सकता है?

03Why did bodies in the asteroid belt not become a complete planet?ग्रहाणु बेल्ट में पिंड पूर्ण ग्रह क्यों नहीं बन पाए?

04What is called a meteor?उल्का किसे कहा जाता है?

05What is a space body called if it survives and falls on Earth?पृथ्वी पर गिरकर बच जाने वाला अंतरिक्ष पिंड क्या कहलाता है?

06The modern explanation of Moon formation is linked with which event?चंद्रमा के निर्माण की आधुनिक व्याख्या किस घटना से जोड़ी जाती है?

07Why was the early Earth very hot?प्रारंभिक पृथ्वी बहुत गर्म क्यों थी?

08Which statement correctly shows the role of gravity in planet formation?ग्रह निर्माण में गुरुत्वाकर्षण की भूमिका किस कथन में सही है?

09What makes the dwarf planet category different in the solar system?सौरमंडल में बौने ग्रह की श्रेणी किस बात से अलग होती है?

10What is the correct beginning of the order of planets by distance from the Sun?ग्रहों के नाम सूर्य से दूरी के क्रम में याद करने का सही आरंभ कौन सा है?

11Which planet is also called the Blue Planet?किस ग्रह को नीला ग्रह भी कहा जाता है?

12Which planet is called the morning and evening star?किस ग्रह को सुबह और शाम का तारा कहा जाता है?

13Which planet has very high surface temperature mainly due to its dense atmosphere?किस ग्रह की सतह पर तापमान बहुत अधिक होने का मुख्य कारण घना वायुमंडल है?

14In gas giant planets what is dominant instead of a solid surface?गैसीय विशाल ग्रहों में ठोस सतह के बजाय क्या प्रमुख होता है?

15Why did the cloud of dust and gas contract during the birth of the solar system?सौरमंडल के जन्म के समय धूल और गैस का बादल किस कारण सिकुड़ा?

16What is a good example of leftover small rocky bodies after planet formation?ग्रह निर्माण के बाद बचे छोटे चट्टानी पिंडों का अच्छा उदाहरण कौन सा है?

17The Kuiper Belt is more linked with which type of bodies?कुइपर बेल्ट किस प्रकार के पिंडों से अधिक जुड़ी है?

19When small bodies collide with a planet and merge into it what increases?जब छोटे पिंड ग्रह से टकराकर उसमें मिल जाते हैं तो ग्रह का क्या बढ़ता है?

20In planet formation what is the next general stage after a protoplanet?ग्रह बनने की प्रक्रिया में आदिग्रह का अगला सामान्य चरण क्या है?

21Due to the Sun's gravity planets remain in which path?सूर्य के गुरुत्वाकर्षण से ग्रह किस मार्ग में बने रहते हैं?

22What is one reason for the higher density of terrestrial planets?स्थलीय ग्रहों की अधिक घनता का एक कारण क्या है?

23The arrangement that keeps planets around the Sun is explained by what?सौरमंडल में ग्रहों को सूर्य के चारों ओर टिकाए रखने वाली व्यवस्था किससे समझी जाती है?

24What is one general reason outer planets have many satellites?बाहरी ग्रहों के अनेक उपग्रह होने का एक सामान्य कारण क्या है?

25The temperature difference in the early solar system helps explain what?प्रारंभिक सौरमंडल में तापमान का अंतर किस बात को समझाने में मदद करता है?

Analytics choices

01By what name is the early disk in the formation of the solar system known?

02Why can a comet show a tail when it comes near the Sun?

03Why did bodies in the asteroid belt not become a complete planet?

04What is called a meteor?

05What is a space body called if it survives and falls on Earth?

06The modern explanation of Moon formation is linked with which event?

07Why was the early Earth very hot?

08Which statement correctly shows the role of gravity in planet formation?

09What makes the dwarf planet category different in the solar system?

10What is the correct beginning of the order of planets by distance from the Sun?

11Which planet is also called the Blue Planet?

12Which planet is called the morning and evening star?

13Which planet has very high surface temperature mainly due to its dense atmosphere?

14In gas giant planets what is dominant instead of a solid surface?

15Why did the cloud of dust and gas contract during the birth of the solar system?

16What is a good example of leftover small rocky bodies after planet formation?

17The Kuiper Belt is more linked with which type of bodies?

19When small bodies collide with a planet and merge into it what increases?

20In planet formation what is the next general stage after a protoplanet?

21Due to the Sun's gravity planets remain in which path?

22What is one reason for the higher density of terrestrial planets?

23The arrangement that keeps planets around the Sun is explained by what?

24What is one general reason outer planets have many satellites?

25The temperature difference in the early solar system helps explain what?