NCERT Solutions for Class 9 Science

Free Download NCERT Solutions for Class 9 Science all chapters in PDF for 2019 – 2020 CBSE Exams in हिंदी मीडियम and English Medium is available to download. NCERT Solutions and NCERT Solutions Apps Updated for new academic session 2019-20.


Class:9
Subject:Science – विज्ञान
Select the any chapter:
  1. Matter in Our Surroundings
  2. Is Matter Around Us Pure
  3. Atoms and Molecules
  4. Structure of the Atom
  5. The Fundamental Unit of Life
  6. Tissues
  7. Diversity in Living Organisms
  8. Motion
  9. Force and Laws of Motion
  10. Gravitation
  11. Work and Energy
  12. Sound
  13. Why do We Fall ill
  14. Natural Resources
  15. Improvement in Food Resources




NCERT Solutions Class 9 Science PDF

Chapter 1: Class 9 Chemistry

Select one of the following to see the online solutions for chapter 1 as well as for download. English and Hindi Solutions for Class 9 chapter 1 are given below.

Matter in Our Surroundings

हमारे आस – पास के पदार्थ

Chapter 2: Class 9 Chemistry

Select one of the following to see the online solutions for chapter 2 as well as for download. English and Hindi Solutions for Class 9 chapter 2 are given below.

Is Matter Around Us Pure?

क्या हमारे आस – पास के पदार्थ शुद्ध हैं?

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Chapter 3: Class 9 Chemistry

Select one of the following to see the online solutions for chapter 3 as well as for download. English and Hindi Solutions for Class 9 chapter 3 are given below.

Atoms and Molecules

परमाणु एवं अणु



Chapter 4: Class 9 Chemistry

Select one of the following to see the online solutions for chapter 4 as well as for download. English and Hindi Solutions for Class 9 chapter 4 are given below.

Structure of Atom

परमाणु की संरचना

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Chapter 5: Class 9 Biology

Select one of the following to see the online solutions for chapter 5 biology section as well as for download. English and Hindi Solutions for Class 9 chapter 5 are given below.

The Fundamental Unit of Life

जीवन की मौलिक इकाई

Chapter 6: Class 9 Biology

Select one of the following to see the online solutions for chapter 6 as well as for download. English and Hindi Solutions for Class 9 chapter 6 Biology for class 9 are given below.

Tissues

ऊत्तक

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Chapter 7: Class 9 Biology

Select one of the following to see the online solutions of Biology class 9 chapter 7 as well as for download. English and Hindi Solutions for Class 9 chapter 7 are given below.

Diversity in Living Organisms

जीवों में विविधता

Chapter 8: Class 9 Physics

Select one of the following to see the online solutions for chapter 8 as well as for download. English and Hindi Solutions for Class 9 chapter 8 are given below.

Motion

गति

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Chapter 9: Class 9 Physics

Select one of the following to see the online solutions for chapter 9 Physics for class 9 as well as for download. English and Hindi Solutions for Class 9 chapter 9 are given below.

Force and Laws of Motion

बल तथा गति के नियम


Chapter 10: Class 9 Physics

Select one of the following to see the online solutions for chapter 10 as well as for download. English and Hindi Solutions for Class 9 chapter 10 are given below.

Gravitation

गुरुत्वाकर्षण

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Chapter 11: Class 9 Physics

Select one of the following to see the online solutions for chapter 11 as well as for download. English and Hindi Solutions for Class 9 chapter 11 Physics for class 9 are given below.

Work and Energy

कार्य तथा ऊर्जा

Chapter 12: Class 9 Physics

NCERT Solutions for Class 9 Science Chapter 12 in Hindi Medium and English Medium PDF as well as to study online with extra books for exams preparation.

Sound

ध्वनि

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Chapter 13: Class 9 Biology

NCERT Solutions for Class 9 Science Chapter 13 in Hindi Medium and English Medium PDF as well as to study online with extra books for exams preparation.

Why do We Fall ill

हम बीमार क्यों होते हैं

Chapter 14: Class 9 Science

NCERT Solutions for Class 9 Science Chapter 14 in Hindi Medium and English Medium PDF as well as to study online with extra books for exams preparation.

Natural Resources

प्राकृतिक संपदा

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Chapter 15:  Class 9 Biology

NCERT Solutions for Class 9 Science Chapter 15 (Biology Section) in Hindi Medium and English Medium PDF as well as to study online with extra books for exams preparation.

Improvement in Food Resources

खाद्य संसाधनों में सुधार

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  1. MCQ practice questions from Practical -1 English Medium
  2. MCQ practice questions from Practical -2 English Medium
  3. MCQ practice questions from Practical -1 Hindi Medium
  4. MCQ practice questions from Practical -2 Hindi Medium

Buy Books & Solutions Online

In the same section assignments, Previous years questions with solutions are also given. Important questions according to the latest NCERT Syllabus from popular books Lakhmir Singh and Manjit Kaur, S Chand, Pradeep’ fundamental book, Together with Science, U – Like and other important books will be included in the assignments. NCERT Books Solutions for UP Board are also given. If you need answers of questions related to any chapter, please upload through FORUM, we will provide solutions with in 48 hours.

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Naphthalene balls disappear with time without leaving any solid. Why?

Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid.

Water at room temperature is a liquid. Give reason.

Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape.

What do you understand by a Saturated solution?

Saturated Solution: A solution in which no more of the solid (solute) can be dissolved at a given temperature is called a saturated solution. Suppose 50 gm of a solute is the maximum amount that can be dissolved in 100 gm water at 298 K. Then 150 gm of solution so obtained is the saturated solution at 298 K.

पदार्थ से आप क्या समझते हैं?

एक या एक से अधिक शुद्ध तत्वों या यौगिकों से मिलकर बना मिश्रण, पदार्थ कहलाता है। वे पदार्थ जो एक ही प्रकार के अणुओं और परमाणुओं से मिलकर बने होते हैं तथा सभी कणों की रासायनिक प्रकृति समान होती है, शुद्ध पदार्थ कहलाते हैं।

When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of oxygen? Which law of chemical combinations will govern your answer?

Carbon + Oxygen → Carbon dioxide
3g of carbon reacts with 8 g of oxygen to produce 11g of carbon dioxide. If 3g of carbon is burnt in 50g of oxygen, then 3g of carbon will react with 8 g of oxygen. The remaining 42 g of oxygen will be left un-reactive. In this case also, only 11g of carbon dioxide will be formed. The above answer is governed by the law of constant proportions.

हाइड्रोजन एवं ऑक्सीजन द्रव्यमान के अनुसार 1:8 के अनुपात में संयोग करके जल निर्मित करते हैं। 3 g हाइड्रोजन गैस के साथ पूर्ण रूप से संयोग करने के लिए कितने ऑक्सीजन गैस के द्रव्यमान की आवश्यकता होगी?

हाइड्रोजन : ऑक्सीजन = 1:8
1 g हाइड्रोजन की सम्पूर्ण अभिक्रिया के लिए जरुरी ऑक्सीजन = 8 g
इसलिए, 3 g हाइड्रोजन की सम्पूर्ण अभिक्रिया के लिए जरुरी ऑक्सीजन = 8×3 = 24 g
अतः, 3 g हाइड्रोजन गैस के साथ पूर्ण रूप से संयोग करने के लिए 24 g ऑक्सीजन गैस के द्रव्यमान की आवश्यकता होगी।

What are the limitations of J.J. Thomson’s model of the atom?

According to J.J. Thomson’s model of an atom, an atom consists of a positively charged sphere with electrons embedded in it. However, it was later found that the positively charged particles reside at the center of the atom called the nucleus, and the electrons revolve around the nucleus.

What are the limitations of Rutherford’s model of the atom?

According to Rutherford’s model of an atom, electrons revolve around the nucleus in fixed orbits. But, an electron revolving in circular orbits will not be stable because during revolution, it will experience acceleration. Due to acceleration, the electrons will lose energy in the form of radiation and fall into the nucleus. In such a case, the atom would be highly unstable and collapse.

What would happen if the plasma membrane ruptures or breaks down?

Plasma membrane is a selectively permeable membrane of the cell that maintains its homeostasis, i.e., constant internal composition of the cell. If it ruptures or breaks down the constant internal chemical composition of the cell will be lost and it will not be able to perform its basic functions. Such a cell with ruptured plasma membrane is killed.

कोशिका की खोज किसने और कैसे की?

कोशिका की खोज सर्वप्रथम राबर्ट हुक ने की। उन्होंने 1665 में कॉर्क की पतली छीलन को अपने बनाए गए सूक्ष्मदर्शी में देखा जिसमें मधुमखी के छत्ते जैसे छोटी छोटी कोठरियाँ दिखायी दी जिन्हे उन्होंने (सेल) कोशिका नाम दिया।

Define the term ‘tissue’?

The group of cells similar in structure that work together to achieve a particular function forms a tissue. This group of cells has a common origin.

बहुकोशिक जीवों में ऊतकों का क्या उपयोग है?

बहुकोशिक जीवों में ऊतक भोजन का पाचन, स्वसन, उत्सर्जन, परिसंचरण, गमन तथा जनन आदि कार्य करते हैं।

अपने चारों ओर फैले जीव रूपों की विभिन्नता के तीन उदाहरण दें।

जीवों में तीन प्रकार विभिन्ता प्रायः देखी जाती हैं:
आकार: कुछ जीव जैसे बैक्टीरिया अतिसूक्ष्म होते है तो दूसरी ओर ह्वेल जैसे जीव कई मीटर तक लम्बे होते हैं।
जीवन काल: कुछ जीवों जैसे मच्छर का जीवन काल अति न्यून होता है जबकि कुछ पौधे सैकड़ों साल जिन्दा रहते है।
रंग: कुछ जीव रंगहीन (पारदर्शी तक) होते है तो कुछ विभिन्न आकर्षक रंगों युक्त होते हैं।

एक वस्तु के द्वारा कुछ दूरी तय की गयी। क्या इसका विस्थापन शून्य हो सकता हैं? अगर हाँ, तो अपने उत्तर को उदाहरण के द्वारा समझाएँ।

हाँ, विस्थापन शून्य हो सकता है, यदि वस्तु अपने प्रारंभिक स्थान पर वापस पहुँच जाए।
जैसे: वृत्ताकार मार्ग पर एक चक्कर लगाने के बाद वस्तु का विस्थापन।

An object experiences a net zero external unbalanced force. Is it possible for the object to be travelling with a non-zero velocity? If yes, state the conditions that must be placed on the magnitude and direction of the velocity. If no, provide a reason.

Yes. Even when an object experiences a net zero external unbalanced force, it is possible that the object is travelling with a non-zero velocity. This is possible only when the object has been moving with a constant velocity in a particular direction. Then, there is no net unbalanced force applied on the body. The object will keep moving with a non-zero velocity. To change the state of motion, a net non-zero external unbalanced force must be applied on the object.

गुरुत्वाकर्षण का सार्वत्रिक नियम बताइए।

गुरुत्वाकर्षण का सार्वत्रिक नियम: “विश्व का प्रत्येक पिंड प्रत्येक अन्य पिंड को एक बल से आकर्षित करता है, जो दोनों पिंडों के द्रव्यमानों के गुणनफल के समानुपाती तथा उनके बीच की दूरी के वर्ग के व्युत्क्रमानुपाती होता है। यह बल दोनों पिंडों को मिलाने वाली रेखा की दिशा में लगता है।“

11 thoughts on “NCERT Solutions for Class 9 Science”

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