Asked/Added Questions From NCERT: Science

Question 1. Asked on :10 April 2021:05:15:52 PM

सामान्य तत्व किसे कहते है ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar
ऐसे तत्त्व जिनकी कोर कक्षाएँ पूर्णत:एवं बाह्यतम कक्षा अपूर्णत: इलेक्ट्रानो से भरी होती है , उन्हे सामान्य तत्व कहते है |

-Answered by Raj Kumar On 14 April 2021:12:02:59 PM

Question 2. Asked on :10 April 2021:05:12:18 PM

समस्थानिक किसे कहते है ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar

एक ही तत्त्व के ऐसे परमाणु जिसकी द्रव्यमान संख्या भिन्न - भिन्न एवं परमाणु संख्या एक सामान हो , उन्हे समस्थानिक कहते है |

-Answered by Raj Kumar On 14 April 2021:12:49:42 PM

Question 3. Asked on :10 April 2021:05:07:50 PM

संक्रमण तत्व किसे कहते है ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar

जिन तत्वों के बाह्यतम कक्षा एवं बाह्यतम कक्षा से पहले वाली कक्षा से अपूर्ण रूप से भरी हो उसे संक्रमण धातु या तत्व कहते है |

-Answered by Raj Kumar On 14 April 2021:12:59:45 PM

Question 4. Asked on :10 April 2021:05:01:20 PM

आधुनिक आवर्त सारणी मे कितने आवर्त और कितने उर्ध्व स्तंभ (समूह) हैं ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Shruti Srivastva

18 समूह और 7 आवृत

-Answered by Shruti Srivastva On 13 April 2021:12:55:56 PM

Question 5. Asked on :10 April 2021:04:57:15 PM

अक्रिय गैसे किसे कहते है ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Shruti Srivastva

18 समूह के सभी तत्त्व

-Answered by Shruti Srivastva On 13 April 2021:12:56:40 PM

Question 6. Asked on :10 April 2021:04:54:05 PM

अष्टक का नियम बताए ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar

यदि तत्वों को उनके बढ़ते हुए परमाणु द्रव्यमान के क्रम मे रखा जाए तो प्रत्येक आठवाँ तत्व एवं प्रथम तत्व के समानता पायी जाती है | इसे न्युलैडस का अष्टक का नियम कहते है |

-Answered by Raj Kumar On 14 April 2021:01:04:42 PM

Question 7. Asked on :10 April 2021:04:52:06 PM

संयोजकता किसे कहते है ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar
किसी तत्व की दुसरे तत्वों से संयोग करने की क्षमता को संयोजकता कहते है | किसी तत्व की संयोजकता उसकी संयोजी इलक़ट्रनो की मदद से ज्ञात की जाती है |

-Answered by Raj Kumar On 12 April 2021:05:06:27 PM

Question 8. Asked on :10 April 2021:04:44:30 PM

आधुनिक आवर्त सारणी के नियम बताइये ?

-Added by Raj Kumar Science » तत्वों का आवर्त वर्गीकरण

Answer:

Raj Kumar

" तत्वों के भौतिक एवं रासायनिक गुण उनके परमाणु संख्या के आवर्त फलन होते है |" इसे आधुनिक आवर्त सारणी नियम कहते है |

-Answered by Raj Kumar On 14 April 2021:01:12:58 PM

Question 9. Asked on :10 April 2021:02:23:42 PM

धातुओ के भौतिक गुणधर्म बताए ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar

(1) पारा को छोड़कर अन्य सभी धातुएँ सामान्य ताप पर ठोस अवस्था मे होती है |

(2) धातुओ कि अपनी विशेष चमक होती है |

(3) ये ताप एवं विधुत कि सुचालक होती है |

(4) ये अघातवर्ध्य तथा तन्य होती है |

-Answered by Raj Kumar On 10 April 2021:04:23:02 PM

Question 10. Asked on :10 April 2021:02:21:09 PM

आवर्त सारणी मे धातुओ एवं अधातुओ को कहा रखा जाता है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar

आवर्त सारणी मे धातुओ को बायीं तरफ तथा मध्य मे रखा जाता है जबकि अधातुओ को दायी तरफ रखा गया है |

-Answered by Raj Kumar On 10 April 2021:04:23:22 PM

Question 11. Asked on :10 April 2021:02:17:57 PM

कैरट किसे कहते है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar

यह सोने की शुद्धता आंकने कि इकाई है | इस इकाई मे 100% शुद्ध सोने को 24 कैरट कहते है |

-Answered by Raj Kumar On 10 April 2021:02:40:48 PM

Question 12. Asked on :10 April 2021:02:15:46 PM

भर्जन किसे कहते है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar

सल्फाइड अयस्क को वायु की उपस्तिथि मे अधिक ताप पर गर्म करने पर यह ऑक्साइड मे परिवर्तित हो जाता है | इस प्रक्रिया को भर्जन कहते है |

-Answered by Raj Kumar On 10 April 2021:04:09:07 PM

Question 13. Asked on :10 April 2021:02:13:44 PM

सोनरता किसे कहते है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar

चोट करने पर एक विशेष ध्वनि उत्पन्न करना सोनरता या सोनोरस (ध्वानिक) कहलाता है

-Answered by Raj Kumar On 10 April 2021:04:16:14 PM

Question 14. Asked on :10 April 2021:02:11:11 PM

धात्विक चमक किसे कहते है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Raj Kumar
धातुओ कि सतह उनकी शुद्ध अवस्था मे चमकदार होती है | इस गुण को धात्विक चमक कहते है |

-Answered by Raj Kumar On 10 April 2021:04:04:54 PM

Question 15. Asked on :10 April 2021:02:02:43 PM

खनिज किसे कहते है ?

-Added by Raj Kumar Science » धातु एवं अधातु

Answer:

Shruti Srivastva

वे तत्त्व जो प्राकर्तिक भुपप्प्ती पर प्राकर्तिक रूप से पाए जाते है

-Answered by Shruti Srivastva On 13 April 2021:12:57:40 PM

Question 16. Asked on :10 April 2021:01:26:00 PM

संक्षारण क्या है तथा उसके रोकथाम के उपाय बताइए ?

-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Raj Kumar

संक्षारण - जब कोई धातु अपने आसपास अम्ल , नमी आदि के संपर्क मे आती है तब यह संक्षारित होती है और इस प्रक्रिया को संक्षारण कहते है |

संक्षारण की रोकथाम के उपाये -

(i) तेल लगाकर (ii) पेंट लगाकर

(iii) गंधकीकरन द्वारा (iv)वार्निश के उपयोग द्वारा

-Answered by Raj Kumar On 14 April 2021:01:18:04 PM

Question 17. Asked on :10 April 2021:01:23:38 PM

संयुक्त अभिक्रिया किसे कहते हैं ?

-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Raj Kumar

वह अभिक्रिया जिसमे दो या दो से अधिक अभिकारक मिलकर एकल उत्पाद का निर्माण करते है उसे संयुक्त अभिक्रिया कहते है

-Answered by Raj Kumar On 10 April 2021:01:43:07 PM

Question 18. Asked on :10 April 2021:01:21:13 PM

अभिकारक क्या है ?

-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Raj Kumar

वे पदार्थ जो रासायनिक अभिक्रिया मे भाग लेते है , अभिकारक कहलाते है |

-Answered by Raj Kumar On 10 April 2021:01:47:15 PM

Question 19. Asked on :10 April 2021:01:18:20 PM

संतुलित रासायनिक समीकरण क्या हैं ?

-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Master Mind
वह रासायनिक समीकरण जिसके अभिकारक और उत्पाद के ओर के सभी प्रकार के अणुओं और परमाणुओं की संख्या सामान हो तो ऐसे समीकरण को संतुलित रासायनिक समीकरण कहते हैं | जैसे -

2HNO₃ + Ca (OH)₂ → Ca(NO₃)₂ +2H₂O

इसमें अभिकारक और उत्पाद के ओर के सभी परमाणुओं की संख्या समान है अत: यह संतुलित रासायनिक समीकरण है |

-Answered by Master Mind On 10 April 2021:02:09:09 PM

Question 20. Asked on :10 April 2021:01:10:25 PM

समीकरण किसे कहते हैं

-Added by Raj Kumar Science » रासयिनिक अभिक्रियाए और समीकरण

Answer:

Raj Kumar

जब किसी रासयनिक अभिक्रिया को संकेतो अथवा सूत्रों के माध्यम से व्यक्त किया जाता है तो इसे समीकरण या रासायनिक समीकरण कहते है

-Answered by Raj Kumar On 10 April 2021:01:34:30 PM

Question 21. Asked on :10 April 2021:12:48:49 PM

शब्द समीकरण क्या दर्शाता है

-Added by Raj Kumar Science » रसयानिक अभिक्रियाएँ अवम समीकरण

Answer:

Raj Kumar

कोई शब्द् समीकरण अभिकारकों के उत्पादों में परिवर्तन को इस के मध्य एक तीर के निशान द्वारा दर्शाता है शब्द समीकरण कहते हैं

-Answered by Raj Kumar On 10 April 2021:01:04:28 PM

Question 22. Asked on :10 April 2021:12:41:56 PM

कंकाली रासयानिक समीकरण क्या है ?

-Added by Raj Kumar Science » रसयानिक अभिक्रियाएँ अवम समीकरण

Answer:

Raj Kumar

यदि अभिक्रिया के बाद एवं पहले समीकरण के दोनों और का द्रव्यमान बराबर नहीं होता है तो ऐसा समीकरण कंकाली रासायनिक समीकरण कहलाता है

-Answered by Raj Kumar On 10 April 2021:12:58:33 PM

Question 23. Asked on :09 April 2021:05:16:25 PM

गुरुत्वाकर्षण बल किसे कहते हैं ?

-Added by Raj Kumar Science » गुरुत्वाकर्षण

Answer:

Raj Kumar

ब्रहमांड मे पदार्थ का प्रत्येक कण प्रत्येक दुसरे कण को अपनी ओर आकर्षित करता है | इस सर्वव्यापी आकर्षण बल को गुरुत्वाकर्षण बल कहते है

-Answered by Raj Kumar On 09 April 2021:05:20:06 PM

Question 24. Asked on :30 September 2020:03:59:14 AM

एक 50 g द्रव्यमान की गोली 4 kg द्रव्यमान की रायफल से 35 ms-1 के प्रारंभिक वेग से छोड़ी जाती है। रायफल के प्रारंभिक प्रतिक्षेपित वेग की गणना कीजिए।

-Added by Master Mind Science » Force And Laws Of Motion

Answer:

Master Mind

रायफल का द्रव्यमान M = 4 kg

गोली का द्रव्यमान m = 50 g = 0.050 kg

गोली का प्रारंभिक वेग u = 0 ms^-1

गोली की अंतिम वेग v = 35 ms^-1

राइफल का प्रारंभिक वेग U = 0 ms^-1

राइफल का प्रतिक्षेपित वेग V = ?

गोली छूटने के पहले का संवेग = MU + mu

= 4 × 0 + 0.050 × 0

= 0 kg ms^-1

गोली छूटने के बाद का संवेग = MV + mv

= 4 × V + 0.050 × 35

= 4V + 1.750 kg ms^-1

संवेग संरक्षण के नियम से

गोली छूटने के बाद का संवेग = गोली छूटने के पहले का संवेग

4V + 1.750 = 0

4V = - 1.750

V = - 1.7504 = - 0.4375 ms^-1

-Answered by Master Mind On 30 September 2020:03:59:53 AM

Question 25. Asked on :30 September 2020:02:19:34 AM

किसी व्यक्ति का औसत श्रव्य परास 20 Hz से 20 kHz है। इन दो आवृत्तियों के लिए ध्वनि तरंगों की तरंगदैर्घ्य ज्ञात कीजिए। वायु में ध्वनि का वेग 344 m s^–1 लीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

-Answered by Master Mind On 30 September 2020:02:20:34 AM

Question 26. Asked on :30 September 2020:02:16:51 AM

दो बालक किसी ऐलुमिनियम पाइप के दो सिरों पर हैं। एक बालक पाइप के एक सिरे पर पत्थर से आघात करता है। दूसरे सिरे पर स्थित बालक तक वायु तथा ऐलुमिनियम से होकर जाने वाली ध्वनि तरंगों द्वारा लिए गए समय का अनुपात ज्ञात कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

-Answered by Master Mind On 30 September 2020:02:19:12 AM

Question 27. Asked on :30 September 2020:02:15:28 AM

किसी ध्वनि ड्डोत की आवृत्ति 100 Hz है। एक मिनट में यह कितनी बार कंपन करेगा?

-Added by Master Mind Science » Sound

Answer:

Master Mind

-Answered by Master Mind On 30 September 2020:02:15:50 AM

Question 28. Asked on :30 September 2020:02:13:17 AM

500 मीटर ऊँची किसी मीनार की चोटी से एक पत्थर मीनार के आधार पर स्थित एक पानी के तालाब में गिराया जाता है। पानी में इसके गिरने की ध्वनि चोटी पर कब सुनाई देगी? (g = 10 m s^-2 तथा ध्वनि की चाल = 340 m s^-1)

-Added by Master Mind Science » Sound

Answer:

Master Mind

-Answered by Master Mind On 30 September 2020:02:14:12 AM

Question 29. Asked on :30 September 2020:02:11:42 AM

सोनार की कार्यविधि तथा उपयोगों का वर्णन कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

सोनार (SONAR) शब्द का पूरा नाम Sound Navigation And Ranging है |

सोनार एक युक्ति है। जिसमें जल में स्थित पिंडों की दूरी, दिशा, तथा चाल मापने के लिए पराध्वनि तरंगों का उपयोग किया जाता है। यह एक यंत्र है जिसमें एक प्रेषित्र तथा एक संसूचक होता है और इसे नाव या जहाज में लगाया जाता है।

सोनार तकनीक का उपयोग:

सोनार की तकनीक का उपयोग समुद्र की गहराई ज्ञात करने तथा जल के अंदर स्थित चट्टानो, घाटियों, पनडुब्बियों, हिमशैल, डुबे हुए जहाज आदि की जानकारी प्राप्त करने के लिए किया जाता है।

-Answered by Master Mind On 30 September 2020:02:12:17 AM

Question 30. Asked on :30 September 2020:02:09:38 AM

किसी धातु के ब्लॉक में दोषों का पता लगाने के लिए पराध्वनि का उपयोग कैसे किया जाता है वर्णन कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

धत्विक घटकों को प्रायः बड़े-बड़े भवनों, पुलों, मशीनों तथा वैज्ञानिक उपकरणों को बनाने के लिए उपयोग में लाया जाता है। धातु के ब्लॉकों में विद्यमान दरार या छिद्र जो बाहर से दिखाई नहीं देते, भवन या पुल की संरचना की मशबूती को कम कर देते हैं। पराध्वनि तरंगें धातु के ब्लॉक से गुजारी जाती हैं और प्रेषित तरंगों का पता लगाने के लिए संसूचकों का उपयोग किया जाता है। यदि थोड़ा-सा भी दोष होता है, तो पराध्वनि तरंगें परावर्तित हो जाती हैं जो दोष की उपस्थिति को दर्शाती है |

-Answered by Master Mind On 30 September 2020:02:10:20 AM

Question 31. Asked on :30 September 2020:02:07:31 AM

अनुरणन क्या है? इसे कैसे कम किया जा सकता है?

-Added by Master Mind Science » Sound

Answer:

Master Mind

ध्वनि का दीवारों से बारंबार परावर्तन जिसके कारण ध्वनि-निर्बंध होता है, अनुरणन कहलाता है |

अनुरणन के कारण ध्वनि साफ नहीं सुनाई देती है सुनने में बाधा उत्पन्न होता है | अनुरणन अवांछनीय है इसे कम करने की आवश्यकता होती है |

इसे निम्नलिखित तरीके से कम किया जा सकता है |

(i) इसे कम करने के लिए भवनों में पर्दे लटकाये जाते हैं, ताकि ध्वनि का अवशोषण हो सके |

(ii) कमरे या सभागारों में श्रोताओं की उपस्थिति बढ़ाने से, इससे भी ध्वनि का अवशोषण होता है |

(iii) इसे कम करने के लिए संपीडित फाइबर बोर्ड, खुरदरे प्लास्टर आदि लगाया जाता है |

(iv) सीटों के पदार्थ सही चुनाव भी ध्वनि अवशोषक के रूप में कार्य करते हैं |

-Answered by Master Mind On 30 September 2020:02:07:51 AM

Question 32. Asked on :30 September 2020:02:06:08 AM

चमगादड़ अपना शिकार पकड़ने के लिए पराध्वनि का उपयोग किस प्रकार करता है? वर्णन कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind

चमगादड़ गहन अंधकार में अपने भोजन को खोजने के लिए उड़ते समय पराध्वनि तरंगें उत्सर्जित करता है तथा परावर्तन के पश्चात् इनका संसूचन करता है। चमगादड़ द्वारा उत्पन्न उच्च तारत्व के पराध्वनि स्पंद अवरोधें या कीटों से परावर्तित होकर चमगादड़ के कानों तक पहुँचते हैं । इन परावर्तित स्पंदों की प्रकृति से चमगादड़ को पता चलता है कि अवरोध् या कीट कहाँ पर है और यह किस प्रकार का है पता लगा लेते है और आसानी से अपने शिकार तक पहुँच जाते हैं |

-Answered by Master Mind On 30 September 2020:02:06:49 AM

Question 33. Asked on :30 September 2020:02:02:43 AM

एक पनडुब्बी पर लगी एक सोनार युक्ति, संकेत भेजती है और उनकी प्रतिध्वनि 5 s पश्चात् ग्रहण करती है। यदि पनडुब्बी से वस्तु की दूरी 3625 m हो तो ध्वनि की चाल की गणना कीजिए।

-Added by Master Mind Science » Sound

Answer:

Master Mind
पनडुब्बी से वस्तु की दुरी d = 3625 m

प्रतिध्वनि का समय t = 5 sec

पानी में ध्वनि की चाल v = ?

d = v × t2

v × t = 2d

v = 2dt

पानी में ध्वनि की चाल = 2 × 36255 = 1450 ms^-1

-Answered by Master Mind On 30 September 2020:02:04:30 AM

Question 34. Asked on :20 August 2020:06:10:37 PM

What is non-metal?

-Added by Shruti Srivastva Science » Metal And Non Metals

Answer:

nisha sheikh
Non-metals are the elements which form negative ions by accepting or gaining electrons. An element or substance that is not a metal.

-Answered by nisha sheikh On 22 August 2020:09:52:04 AM

Question 35. Asked on :20 August 2020:06:10:13 PM

What is metal?

-Added by Shruti Srivastva Science » Metal And Non Metals

Answer:

nisha sheikh

Solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity (e.g. iron, gold, silver, and aluminium, and alloys such as steel).

-Answered by nisha sheikh On 22 August 2020:09:54:16 AM

Question 36. Asked on :06 August 2020:05:42:36 PM

What are matter?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

Matter, material substance that constitutes the observable universe and, together with energy, forms the basis of all objective phenomena.

-Answered by Shruti Srivastva On 23 September 2020:05:34:26 PM

Question 37. Asked on :06 August 2020:05:41:11 PM

What is matter?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Question 38. Asked on :06 August 2020:05:40:54 PM

What are solute?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
In order to be a true solution, a mixture must be stable. ... This is because the dissolved particles in a solution are very small, usually less than 1 nm in diameter. Solute particles can be atoms, ions, or molecules, depending on the type of substance that has been dissolved.

-Answered by Shruti Srivastva On 23 September 2020:05:35:38 PM

Question 39. Asked on :06 August 2020:05:40:16 PM

What is solute?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:36:05 PM

Question 40. Asked on :06 August 2020:05:39:47 PM

What are heterogeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
A heterogeneous mixture is a mixture that is non-uniform and contains smaller component parts.

-Answered by Shruti Srivastva On 23 September 2020:05:36:51 PM

Question 41. Asked on :06 August 2020:05:39:25 PM

What is heterogeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
A heterogeneous mixture is a mixture that is non-uniform and contains smaller component parts.

-Answered by Shruti Srivastva On 23 September 2020:05:37:06 PM

Question 42. Asked on :06 August 2020:05:39:08 PM

What are hoemegeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
A homogeneous mixture is a mixture throughout the solution in which the composition is uniform. The saltwater mentioned above is homogeneous due to the even distribution of the dissolved salt throughout the entire sample of saltwater.

-Answered by Shruti Srivastva On 23 September 2020:05:37:19 PM

Question 43. Asked on :06 August 2020:05:38:48 PM

What is homegeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:39:49 PM

Question 44. Asked on :06 August 2020:05:37:47 PM

What are solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

Solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter, but solutions of gases and solids are possible.

-Answered by Shruti Srivastva On 23 September 2020:05:40:20 PM

Question 45. Asked on :06 August 2020:05:37:19 PM

What is solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

-Answered by Shruti Srivastva On 23 September 2020:05:40:36 PM

Question 46. Asked on :06 August 2020:05:37:00 PM

What are tissue?

-Added by Shruti Srivastva Science » Cell Structure And Function

Answer:

Shruti Srivastva
Group of cell.

-Answered by Shruti Srivastva On 27 August 2020:06:01:03 PM

Question 47. Asked on :06 August 2020:05:35:28 PM

What is tissue?

-Added by Shruti Srivastva Science » Cell Structure And Function

Answer:

Shruti Srivastva
Group of the cell doing a specific function.

-Answered by Shruti Srivastva On 27 August 2020:06:01:27 PM

Question 48. Asked on :06 August 2020:05:26:54 PM

Write difference between evaporation and boiling?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
Evaporation is a normal process that occurs when the liquid form changes into the gaseous form; while causing an increase in the pressure or temperature. Boiling is an unnatural process where the liquid gets heated up and vaporized due to continuous heating of the liquid.

-Answered by Shruti Srivastva On 23 September 2020:05:41:39 PM

Question 49. Asked on :06 August 2020:05:26:20 PM

Write one example of heterogeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

concrete.

-Answered by Shruti Srivastva On 23 September 2020:05:41:55 PM

Question 50. Asked on :06 August 2020:05:25:43 PM

Write one example of homegeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

oil and water.

-Answered by Shruti Srivastva On 23 September 2020:05:42:35 PM

Question 51. Asked on :06 August 2020:05:25:14 PM

Write one example of suspension?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
muddy water.

-Answered by Shruti Srivastva On 23 September 2020:05:43:19 PM

Question 52. Asked on :06 August 2020:05:24:40 PM

Write one example of solution?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

sugar solution

-Answered by Shruti Srivastva On 23 September 2020:05:43:37 PM

Question 53. Asked on :06 August 2020:05:24:21 PM

What are solute?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva
A solute is a substance that can be dissolved by a solvent to create a solution. A solute can come in many forms. It can be gas, liquid, or solid. The solvent, or substance that dissolves the solute, breaks the solute apart and distributes the solute molecules equally.\

-Answered by Shruti Srivastva On 23 September 2020:05:44:05 PM

Question 54. Asked on :06 August 2020:05:22:45 PM

Is suspension is homegeneous or heterogeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

heterogeneous

-Answered by Shruti Srivastva On 23 September 2020:05:44:49 PM

Question 55. Asked on :06 August 2020:05:22:12 PM

Is suspension is heterogeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

yes.

-Answered by Shruti Srivastva On 23 September 2020:05:45:24 PM

Question 56. Asked on :06 August 2020:05:21:36 PM

Is suspension is homegeneous?

-Added by Shruti Srivastva Science » Is Matter Around Us Pure

Answer:

Shruti Srivastva

-Answered by Shruti Srivastva On 23 September 2020:05:45:44 PM

Question 57. Asked on :06 August 2020:05:20:58 PM

Is solution homegenous or heterogenous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva

homegenous

-Answered by Shruti Srivastva On 23 September 2020:05:45:54 PM

Question 58. Asked on :06 August 2020:05:20:27 PM

Is solution is heterogeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
no

-Answered by Shruti Srivastva On 23 September 2020:05:46:07 PM

Question 59. Asked on :06 August 2020:05:19:55 PM

Is solution is homegeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
yes

-Answered by Shruti Srivastva On 23 September 2020:05:46:26 PM

Question 60. Asked on :06 August 2020:05:19:27 PM

What are suspension?

-Added by Shruti Srivastva Science » Atoms And Molecules

Answer:

Shruti Srivastva
A suspension is a heterogeneous mixture in which the solute particles do not dissolve, but get suspended throughout the bulk of the solvent, left floating around freely in the medium

-Answered by Shruti Srivastva On 23 September 2020:05:46:43 PM

Question 61. Asked on :06 August 2020:05:19:09 PM

What is suspension?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:47:01 PM

Question 62. Asked on :06 August 2020:05:18:22 PM

What are solution?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
Solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility. The term solution is commonly applied to the liquid state of matter

-Answered by Shruti Srivastva On 23 September 2020:05:47:13 PM

Question 63. Asked on :06 August 2020:05:17:55 PM

What is solution?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:47:36 PM

Question 64. Asked on :06 August 2020:05:16:38 PM

Write the differnce betweeen homegeneous and heterogeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
A homogeneous mixture is a solid, liquid or gaseous mixture that has the same proportions of its components throughout any given sample. Conversely, a heterogeneous mixture has components in which proportions vary throughout the sample.

-Answered by Shruti Srivastva On 23 September 2020:05:47:48 PM

Question 65. Asked on :06 August 2020:05:16:05 PM

What are heterogeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
A heterogeneous mixture is simply any mixture that is not uniform in composition - it's a non-uniform mixture of smaller constituent parts. ... You can find many examples of heterogeneous mixtures in solid, liquid and gaseous form throughout nature.

-Answered by Shruti Srivastva On 23 September 2020:05:48:13 PM

Question 66. Asked on :06 August 2020:05:15:41 PM

What is heterogeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:48:53 PM

Question 67. Asked on :06 August 2020:05:15:13 PM

What are homegenous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
omogeneous mixtures are also referred to as solutions. While we normally think of solutions as liquids, such as soft drinks and lemonade, they can actually be in the form of solids, liquids, and gases. Homogeneous mixtures can also be a combination of these forms, as in a liquid-gas mixture.

-Answered by Shruti Srivastva On 23 September 2020:05:49:08 PM

Question 68. Asked on :06 August 2020:05:13:44 PM

What is homegeneous?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:49:34 PM

Question 69. Asked on :06 August 2020:05:13:23 PM

What are molecule?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
A molecule can be thought of as a group of atoms stuck together through chemical bonds. Different types of atoms can form different numbers of bonds. Molecules can be as small as 2 atoms stuck together, or as is the case for some proteins, can contain millions of atoms covalently bound.

-Answered by Shruti Srivastva On 23 September 2020:05:49:54 PM

Question 70. Asked on :06 August 2020:05:13:02 PM

What is molecule?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:50:35 PM

Question 71. Asked on :06 August 2020:05:12:40 PM

What are atom?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

Shruti Srivastva
An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.

-Answered by Shruti Srivastva On 23 September 2020:05:50:48 PM

Question 72. Asked on :06 August 2020:05:11:58 PM

What is atom?

-Added by Shruti Srivastva Science » Atom And Molecules

Answer:

-Answered by Shruti Srivastva On 23 September 2020:05:51:08 PM

Question 73. Asked on :03 June 2020:11:57:39 AM

What is central dogma?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva
The central dogma of molecular biology describes the two-step process, transcription and translation, by which the information in genes flows into proteins: DNA → RNA → protein. Transcription is the synthesis of an RNA copy of a segment of DNA. RNA is synthesized by the enzyme RNA polymerase.

-Answered by Shruti Srivastva On 23 September 2020:05:51:19 PM

Question 74. Asked on :03 June 2020:11:55:37 AM

Which organism have the largest number of chromosomes?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

Ophigolossum

-Answered by Shruti Srivastva On 03 June 2020:11:56:19 AM

Question 75. Asked on :03 June 2020:11:53:56 AM

Which organism have the lowest number of chromosomes?

-Added by Shruti Srivastva Science » Cells

Answer:

Shruti Srivastva

Mymercetia

-Answered by Shruti Srivastva On 03 June 2020:11:55:14 AM

Question 76. Asked on :03 June 2020:11:52:15 AM

Which organism have the smallest number of chromosomes?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

Mymercetia

-Answered by Shruti Srivastva On 03 June 2020:11:53:29 AM

Question 77. Asked on :03 June 2020:11:43:30 AM

When chromosomes can be seen?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

When cell is about to divide.

-Answered by Shruti Srivastva On 03 June 2020:11:45:28 AM

Question 78. Asked on :03 June 2020:11:41:49 AM

What is the full form of RNA?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

Ribonucleic acid

-Answered by Shruti Srivastva On 03 June 2020:11:42:45 AM

Question 79. Asked on :03 June 2020:11:38:28 AM

Ribonucleic acid

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva
Ribonucleic acid (RNA) is a molecule similar to DNA. Unlike DNA, RNA is single-stranded. An RNA strand has a backbone made of alternating sugar (ribose) and phosphate groups. Attached to each sugar is one of four bases--adenine (A), uracil (U), cytosine (C), or guanine (G

-Answered by Shruti Srivastva On 23 September 2020:05:51:52 PM

Question 80. Asked on :03 June 2020:11:32:34 AM

How many chromosomes are in human beings?

-Added by Shruti Srivastva Science » Cell

Answer:

Shruti Srivastva

-Answered by Shruti Srivastva On 03 June 2020:11:36:28 AM

Question 81. Asked on :02 June 2020:02:19:03 AM

Tea plantation required rainfall of_______.

-Added by Master Purushottam Science » Crop Production And Management

Answer:

Shruti Srivastva

Tea plantation required annual rainfall

-Answered by Shruti Srivastva On 03 June 2020:11:50:12 AM

Question 82. Asked on :31 May 2020:12:29:50 AM

Arrange the states of matter according their rate of diffusion.

-Added by Master Purushottam Science » Diffusion

Answer:

Nishant Verma

Rate of diffusion is a characteristics of matter based on movement of the particles. In occurs in all state of matter but it fastest in case of gases, followed by liquid and slowest in solids.

-Answered by Nishant Verma On 01 June 2020:02:49:13 PM

Question 83. Asked on :26 May 2020:01:58:58 PM

Write the unit of kelvin scale?

-Added by Manisha kumari Science » Matter In Our Surroundings

Answer:

Shruti Srivastva
273.16 K

-Answered by Shruti Srivastva On 24 August 2020:05:06:34 PM

Question 84. Asked on :26 May 2020:09:48:29 AM

What is plasmolysis?

-Added by Nishant Verma Science » Ch 5

Answer:

Nishant Verma

When a living plant cell loses water through osmosis to there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.

-Answered by Nishant Verma On 26 May 2020:09:49:06 AM

Question 85. Asked on :26 May 2020:09:31:44 AM

What is Endocytosis?

-Added by Nishant Verma Science » Ch 5

Answer:

Nishant Verma

The flexibility of the cell membrane also enables to cell to engulf in food and other materials from its external environment. Such process is known as Endocytosis.

-Answered by Nishant Verma On 26 May 2020:09:42:52 AM

Question 86. Asked on :26 May 2020:09:30:38 AM

Who discovered cell and when? And how?

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva

Robert Hooke.

-Answered by Shruti Srivastva On 24 August 2020:05:07:02 PM

Question 87. Asked on :26 May 2020:09:25:35 AM

Arrange the following substances in increasing order for forces of attraction between particles - water, sugar, oxygen.

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

Oxygen < Water < Sugar.

-Answered by Nishant Verma On 26 May 2020:09:29:11 AM

Question 88. Asked on :26 May 2020:09:24:46 AM

What type of clothes should we wear in Summer.

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva
Cotton cloth.

-Answered by Shruti Srivastva On 24 August 2020:05:07:44 PM

Question 89. Asked on :26 May 2020:09:13:58 AM

Why are be able to sip hot tea or more milk faster from a saucer rather than a cup?

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

A liquid has a larger surface in a saucer. than in a cup thus it vaporates faster and cool faster in a saucer than in a cup.

-Answered by Nishant Verma On 26 May 2020:09:15:49 AM

Question 90. Asked on :26 May 2020:08:54:05 AM

Suggest a method to liquify atmospheric gases?

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva
Condensation.

-Answered by Shruti Srivastva On 24 August 2020:05:08:23 PM

Question 91. Asked on :26 May 2020:08:52:50 AM

For any substances why does the temperature remain constant during the change of state?

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

The temperature remain constant during the change of state because by increasing the pressure and reducing the temperature.

-Answered by Nishant Verma On 26 May 2020:09:21:52 AM

Question 92. Asked on :26 May 2020:08:51:05 AM

What is thealting point of ice?

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva
0ºC

-Answered by Shruti Srivastva On 24 August 2020:05:09:14 PM

Question 93. Asked on :26 May 2020:08:34:30 AM

Which has more density of solid/liquid/gas?

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva
Solid.

-Answered by Shruti Srivastva On 24 August 2020:05:09:58 PM

Question 94. Asked on :26 May 2020:08:33:45 AM

Write different state of matter?

-Added by Nishant Verma Science » Ch 1

Answer:

Shruti Srivastva
Solid, Liquid and Gas.

-Answered by Shruti Srivastva On 24 August 2020:05:10:20 PM

Question 95. Asked on :25 May 2020:01:39:45 PM

What are the major division of the Planter? What are the basis for these divisions.

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

The major five divisions in kingdom plantea are:-

1. Thallophyta. 2. Bryophyta. 3.Pteridophyta. 4. Gynosperms. 5. Angiosperms.

(i) whether the plant body has well differentiated, distinct components.

(ii) Whether the differentiated plant body has special tissue for the transport of water and other substances.

(iii) The ability to bear seeds

(iv) Whether the seeds are enclosed within fruits.

-Answered by Nishant Verma On 25 May 2020:01:47:10 PM

Question 96. Asked on :25 May 2020:01:37:56 PM

How would you choose between two characters to be used for developing a hierarchy in classification?

-Added by Nishant Verma Science » Ch 1

Answer:

Nishant Verma

We choose that characters which depends on the first characterstics and determines the rest variety.

-Answered by Nishant Verma On 25 May 2020:01:45:32 PM

Question 97. Asked on :25 May 2020:01:36:30 PM