Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 111-120 of 600 questions.
Which is the correct chemical symbol of argon?
C. (Ar)
The symbol of argon is (Ar). It is an inert gas.
The correct answer is C. (Ar). The symbol of argon is (Ar). It is an inert gas.
आर्गन का संकेत (Ar) है। यह एक निष्क्रिय गैस है।
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How is the amount of water vapour in the atmosphere?
D. स्थान और समय के अनुसार बदलती हैVaries with place and time
Water vapour is a variable element. Its amount changes with temperature and humidity.
The correct answer is D. स्थान और समय के अनुसार बदलती है / Varies with place and time. Water vapour is a variable element. Its amount changes with temperature and humidity.
जलवाष्प परिवर्तनशील तत्व है। इसकी मात्रा तापमान और आर्द्रता के अनुसार बदलती है।
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Which atmospheric element increases through evaporation?
A. जलवाष्पWater vapour
In evaporation water changes into gas and enters the atmosphere. This increases water vapour.
The correct answer is A. जलवाष्प / Water vapour. In evaporation water changes into gas and enters the atmosphere. This increases water vapour.
वाष्पीकरण में जल गैस रूप में बदलकर वायुमंडल में जाता है। इसी से जलवाष्प बढ़ती है।
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What can provide condensation nuclei for cloud droplets?
B. धूल कणDust particles
Dust particles provide centers for water vapour to condense. This can form cloud droplets.
The correct answer is B. धूल कण / Dust particles. Dust particles provide centers for water vapour to condense. This can form cloud droplets.
धूल कण जलवाष्प को संघनित होने के लिए केंद्र देते हैं। इससे बादल बूंदें बन सकती हैं।
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Which atmospheric gas is necessary for food formation in plants?
C. कार्बन डाइऑक्साइडCarbon dioxide
Plants take carbon dioxide in photosynthesis. This helps them make food.
The correct answer is C. कार्बन डाइऑक्साइड / Carbon dioxide. Plants take carbon dioxide in photosynthesis. This helps them make food.
पौधे प्रकाश संश्लेषण में कार्बन डाइऑक्साइड लेते हैं। इससे वे भोजन बनाते हैं।
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Which gas is mainly required for respiration in living beings?
D. ऑक्सीजनOxygen
Most living beings take oxygen for respiration. Therefore oxygen is essential for life.
The correct answer is D. ऑक्सीजन / Oxygen. Most living beings take oxygen for respiration. Therefore oxygen is essential for life.
अधिकांश जीव श्वसन के लिए ऑक्सीजन लेते हैं। इसलिए ऑक्सीजन जीवन के लिए आवश्यक है।
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Which gas ranks third among the main gases of the atmosphere?
A. आर्गनArgon
After nitrogen and oxygen argon is found in notable amount. Its amount is about zero point nine three percent.
The correct answer is A. आर्गन / Argon. After nitrogen and oxygen argon is found in notable amount. Its amount is about zero point nine three percent.
नाइट्रोजन और ऑक्सीजन के बाद आर्गन अधिक मात्रा में मिलती है। इसकी मात्रा लगभग शून्य दशमलव नौ तीन प्रतिशत है।
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Methane in the atmosphere is an example of what?
B. ट्रेस हरितगृह गैसTrace greenhouse gas
Methane is present in small amount but contributes to the greenhouse effect. It is considered a trace gas.
The correct answer is B. ट्रेस हरितगृह गैस / Trace greenhouse gas. Methane is present in small amount but contributes to the greenhouse effect. It is considered a trace gas.
मीथेन कम मात्रा में पाई जाती है लेकिन हरितगृह प्रभाव में योगदान देती है। इसे ट्रेस गैस माना जाता है।
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What is the approximate percentage of nitrogen in air?
C. अठहत्तर प्रतिशतSeventy eight percent
Nitrogen is about seventy eight percent. It is the largest gaseous part of air.
The correct answer is C. अठहत्तर प्रतिशत / Seventy eight percent. Nitrogen is about seventy eight percent. It is the largest gaseous part of air.
नाइट्रोजन लगभग अठहत्तर प्रतिशत होती है। यह वायु की सबसे बड़ी गैसीय मात्रा है।
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What is the approximate percentage of oxygen in air?
D. इक्कीस प्रतिशतTwenty one percent
Oxygen is about twenty one percent. Remember nitrogen and oxygen percentages together for exams.
The correct answer is D. इक्कीस प्रतिशत / Twenty one percent. Oxygen is about twenty one percent. Remember nitrogen and oxygen percentages together for exams.
ऑक्सीजन लगभग इक्कीस प्रतिशत होती है। परीक्षा में नाइट्रोजन और ऑक्सीजन के प्रतिशत साथ याद रखें।
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