विज्ञान से सम्बन्धित टॉप महत्वपूर्ण प्रश्नोत्तर

यांत्रिकी Part-1 । भौतिक विज्ञान

• डेसिबल किसे नापने के लिए प्रयोग में लाया जाता है? -वातावरण में ध्वनि
• ऐम्पियर क्या नापने की इकाई है? -करेन्ट

यंग प्रत्यास्थता गुणांक का SI मात्रक है। -न्यूटन/मी2
• मात्रकों की अन्तर्राष्ट्रीय पद्धति कब लागू की गई -1971 ई

• खाद्य ऊर्जा को हम किस इकाई में माप सकते हैं? -कैलोरी
• विद्युत मात्रा की इकाई है -ऐम्पियर

SI पद्धति में लैंस की शक्ति की इकाई क्या है? -डायोप्टर
• कैण्डेला मात्रक है । -ज्योति तीव्रता

• जूल इकाई है -ऊर्जा
• ल्यूमेन किसका मात्रक है? -ज्योति फ्लक्स का.

• ‘क्यूरी’ (Curie) किसकी इकाई का नाम है? -रेडियोएक्टिव धर्मिता
• दाब का मात्रक है -पास्कल

• प्रकाश वर्ष इकाई है।-दूरी की
• जड़त्व का माप क्या है -द्रव्यमान

• एंगस्ट्राम क्या मापता है? -तरंगदैर्ध्य
• किसने न्यूटन से पूर्व ही बता दिया था कि सभी वस्तुएँ पृथ्वी की ओर गुरुत्वाकर्षित होती हैं? -ब्रह्मगुप्त

• यदि एक पेंडुलम से दोलन करने वाली घड़ी को पृथ्वी से चन्द्रमा पर ले जाएँ, तो घड़ी होगी -सुस्त
• प्रकाश वोल्टीय सेल के प्रयोग से सौर ऊर्जा का रूपान्तरण करने से किसका उत्पादन होता है? -प्रकाशीय ऊर्जा

• जब हम रबड़ के गद्दे वाली सीट पर बैठते हैं या गददे पर लेटते हैं तो उसका आकार परिवर्तित हो जाता है। ऐसे पदार्थ में पायी जाती है। -स्थितिज ऊर्जा
• उत्प्लावकता से सम्बन्धित वैज्ञानिक है -आर्किमिडीज

• द्रव में आंशिक या पूर्णत: डूबे हुए किसी ठोस द्वारा प्राप्त उछाल की मात्रा निर्भर करती है। -ठोस द्वारा हटाये गए द्रव की मात्रा पर
• जल पृष्ठ पर लोहे के टुकड़े के न तैरने का कारण है । -लोहे द्वारा विस्थापित जल का भार लोहे के भार से कम होता है।

• वेग, संवेग और कोणीय वेग कैसी राशि है? -सदिश राशि
• अदिश राशि है -ऊर्जा

• बल गुणनफल है -द्रव्यमान और त्वरण का
• जब कोई व्यक्ति चन्द्रमा पर उतरता है तो उसके शरीर में उपस्थित -भार घट जाता है तथा मात्रा अपरिवर्तित रहती है

• किसी पिण्ड के उस गुणधर्म को क्या कहते हैं जिससे वह सीधी रेखा में विराम या एकसमान गति की स्थिति में किसी भी परिवर्तन का विरोध करता-जड़त्व
• न्यूटन के पहले नियम को कहते हैं -जड़त्व का नियम

• पारसेक (Parsec) इकाई है । -दूरी की
• वायुमण्डल में बादलों के तैरने का कारण है -घनत्व

• समुद्र में प्लवन करते आइसबर्ग का कितना भाग समुद्र की सतह से ऊपर रहता है? -1/10
• जब कोई नाव नदी से समुद्र में प्रवेश करती है -थोड़ी ऊपर की ओर उठ जाती है

• पानी का घनत्व अधिकतम होता है – 4°C
• वस्तु की मात्रा बदलने पर अपरिवर्तित रहेगा –घनत्व

• तैराक को नदी के मुकाबले समुद्री पानी में तैरना आसान क्यों लगता है? -समुद्री पानी का घनत्व साधारण पानी से ज्यादा होता है
• यदि पृथ्वी का द्रव्यमान वही रहे और त्रिज्या 1% कम हो जाए, तब पृथ्वी के तल पर ‘g’ का मान-2% बढ़ जाएगा

• बोली प्रमेय आधारित है -ऊर्जा संरक्षण पर
• लोहे की सुई पानी की सतह पर तैरती है। इस परिघटना का कारण है – पृष्ठ तनाव

• ब्लाटिंग पेपर द्वारा स्याही के सोखने में शामिल है – केशिकीय अभिक्रिया परिघटना
• यदि हम भूमध्य रेखा से धुत्रों की आरे जाते हैं, तो g का मान – बढ़ता है

• शरीर का वजन -ध्रुवों पर अधिकतम होता है
• एक अंतरिक्ष यात्री पृथ्वी तल की तुलना में चन्द्र तल पर अधिक ऊँची छलांग लगा सकता है, क्योंकि चन्द्र तल पर गुरुत्वाकर्षण बल पृथ्वी तल की तुलना में अत्यल्प है

• जब एक पत्थर को चाँद की सतह से पृथ्वी पर लाया जाता है, तो -इसका भार बदल जाएगा, परन्तु द्रव्यमान नहीं
• किसी लिफ्ट में बैठे हुए व्यक्ति को अपना भार कब अधिक मालूम पड़ता -जब लिफ्ट त्वरित गति से ऊपर जा रही हो

• एक व्यक्ति पूर्णत: चिकने बर्फ के क्षैतिज समतल के मध्य में विराम स्थिति में है। न्यूटन के किस/किन नियम/नियमों का उपयोग करके वह अपने – आपको तट तक ला सकता है? -तीसरा गति नियम
• 20 kg के वजन को जमीन के ऊपर 1 मी की ऊँचाई पर पकड़े रखने के लिए किया गया कार्य है – शून्य जूल एक व्यक्ति एक दीवार को धक्का देता है, पर उसे विस्थापित करने में असफल रहता है, तो वह करता है -कोई भी कार्य नहीं

• पहाड़ी पर चढ़ता एक व्यक्ति आगे की ओर झुक जाता है, क्योंकि -शक्ति संरक्षण हेतु
• पीसा की ऐतिहासिक मीनार तिरछी होते हुए भी नहीं गिरती है, क्योंकि -इसके गुरुत्वकेन्द्र से जाने वाली ऊर्ध्वाधर रेखा आधार से होकर जाती है।

• एक ऊँची इमारत से एक गेंद 9.8 मी/सेकण्ड2 के एकसमान त्वरण के साथ गिरायी जाती है। 3 सेकण्ड के बाद उसका वेग क्या होगा? -29.4 मी/से

 
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