

InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
451. |
Give one word/words for the following statements:(a) Water fit for human consumption.................(b) The harmful substances dissolved in water.............. .(c) The change of states of water from one form to another...................(d) The gaseous form of water found in air................... (e) A mixture of common salt and ice.................(f) A substance which does not contain water................ (g) A property due to which a substance absorbs water without dissolving.................(h) Water molecules in loose chemical combination with other substances .............. |
Answer» (a) potable water (b) impurities (c) water cycle (d) water vapors (e) freezing mixture (f) anhydrous substances (g) hydroscopic (h) water of crystallization |
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452. |
Name three metals which do not react with water under normal conditions. |
Answer» Copper, tin and aluminium are the three metals which do not react with water under normal conditions. |
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453. |
Give two reasons to prove that water is a compound and not an element. |
Answer» Though water contains combustible hydrogen and supporter of combustion oxygen, water is neither a supporter of combustion nor a combustible substance. Water has a different property which hydrogen and oxygen do not have i.e., it is a very good fire extinguisher, compound does not show the properties of elements by which it is formed but it will have a different property since it is a new substance. By this one can prove that water is a compound. |
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454. |
Fill in blanks with suitable words :The chemical used to soften hard water is ……… |
Answer» The chemical used to soften hard water is sodium carbonate. |
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455. |
Fill in blanks with suitable words :The chemical name of Epsom salt is …… |
Answer» The chemical name of Epsom salt is sulfate (Magnesium). |
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456. |
Why are ice, liquid water and steam considered to have the same chemical substance ? |
Answer» Ice, liquid water and steam have same composition i.e. 2 parts hydrogen and one part oxygen by volume and same formula H2O, can be easily transformed from one state to other by heating or cooling. |
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457. |
What is water cycle ? What is its importance ? |
Answer» Water cycle : The change of water from one form to another in nature which results in continuous circulation of water from earth’s surface to the atmosphere and from the atmosphere back to the earth’s surface is called water cycle. Importance of water cycle: 1. It assures a continuous supply of water to us. 2. In controlling the climatic conditions all over the world. |
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458. |
How is a cloud formed ? |
Answer» Water from the surface of earth, lakes, seas, rivers, formed by plants (transpiration) etc. evaporates and rises high up in the atmosphere and condense into water droplets and collect to form cloud. |
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459. |
Activated sludge contain the following percentage of water A) 1% B) 2% C) 97% D) 100% |
Answer» Correct option is C) 97% |
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460. |
How much percentage of fresh water exist in glaciers? A) 1% B) 2% C) 3%D) 7% |
Answer» Correct option is B) 2% |
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461. |
The following is a rainfed crop A) JowarB) Redgram C) Green gram D) All of these |
Answer» Correct option is D) All of these |
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462. |
The following is a water conservation construction A) Percolation tank B) Contour trench C) Check dam D) All of these |
Answer» Correct option is D) All of these |
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463. |
The picture indicates thatA) Water pollutionB) Floods C) Water scarcity D) Rain |
Answer» Correct option is C) Water scarcity |
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464. |
Compare the conductivity of a solution of `NaOH` in water and in alcohol. |
Answer» (i) comparison of polar nature of water and alcohol (ii) type of bonds present in sodium hydroxide (iii) relation between polarity and dielectric constant (iv) effect of dielectric constant on solubility (v) comparison of dielectric constants of water and alcohol |
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465. |
What is the latent heat of fusion and latent heat of vapourization of 10 g of ice and water resepectively?A. 800 cal, 800 calB. 540 cal, 540 calC. 800 cal, 5400 calD. 540 cal, 800 cal |
Answer» Correct Answer - C Latent heat of fusion of 10 g of ice is `10 xx 80` = 800 cal Latent heat of vapourization of 10 g of water is `10 xx 540` = 5400 cal |
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466. |
Compare the density of water at `4^(@)C` with that below and above `4^(@)C`. |
Answer» `({:("Temperature"," ""Density"),(0^(@)C "below" 4^(@)C," "lt1g//c c),(4^(@)C," "1g//c c),(gt4^(@)C," "lt1g//c c):})/` | |
467. |
Which among the following is a true solution ?A. vinegar in waterB. sulphur in waterC. aluminium paintD. starch solution |
Answer» Vinegar in water is a true solution since it is highly soluble in water. | |
468. |
What is a great national problem in India? And how can it be solved? भारत में एक बड़ी राष्ट्रीय समस्या क्या है? और इसका समाधान कैसे हो सकता है? |
Answer» The harnessing of our rivers is a great national problem because the water of these rivers now mostly runs to waste. Vast areas of land can be turned into fertile ones by well-planned action. नदियों के जल को काम में लेना एक बड़ी राष्ट्रीय समस्या है, क्योंकि इन नदियों का अधिकांश जल अंबे व्यर्थ बह जाता है। सुनियोजित कदम उठाकर एक बड़े भू-भाग को उपजाऊ भूमि में परिवर्तित किया जा सकता है। High level of illiteracy, lack of healthcare facilities, and limited access to resources are some of the basic problems in poor areas. Pollution and environmental issues are the other challenges that India is facing at present. Though India is working hard, there is a long way to go. |
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469. |
Why is systematic planting one of the most urgent needs of India? सुनियोजित वृक्षारोपण भारत की परमावश्यक आवश्यकताओं में से एक क्यों है? |
Answer» The systematic planting of suitable trees in every possible place is one of the urgent needs of India because they would prevent soil erosion and conserve rainwater of the country from flowing away to waste. प्रत्येक सम्भावित स्थान पर व्यवस्थित ढंग से उचित वृक्षारोपण भारत की परमावश्यक आवश्यकताओं में से एक है क्योंकि यह मिट्टी के कटाव को रोकेगा और देश के वर्षा जल को व्यर्थ बहने से रोककर उसे संरक्षित करेगा। |
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470. |
How was Egypt made by the river Nile?मिस्र का निर्माण नील नदी द्वारा किस प्रकार हुआ? |
Answer» The river Nile brought the finest silt in its flood waters from Abyssinia and Central Africa and created its valley in Egypt. This fertile valley proved a boon in the creation of the civilization of Egypt. Thus Egypt was made by the river Nile. नील नदी अपने बाढ़ के पानी के साथ अबीसीनिया एवं मध्य अफ्रीका से सर्वोच्च गुणवत्ता वाली मिट्टी बहा कर लाई और उसने मिस्र में अपनी घाटी का निर्माण किया। यह उपजाऊ घाटी मिस्र की सभ्यता के निर्माण में वरदान सिद्ध हुई । इस प्रकार मिस्र का निर्माण नील नदी द्वारा हुआ। |
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471. |
What major steps can be taken in order to conserve water? जल-संरक्षण के लिए कौन से उपाय किए जा सकते हैं? |
Answer» No agricultural and physiological activity is possible without water. India is primarily जल के बिना कृषि व अन्य किसी भी प्रकार की जैविक क्रिया सम्भव नहीं है। भारत मुख्य रूप से एक कृषिप्रधान देश है। हमारी अर्थव्यवस्था मुख्यतः कृषि पर आधारित है। भारत में कृषि मौसमी वर्षा पर निर्भर करती है। अधिकांशतः वर्षा अपर्याप्त होती है या अनियमित होती है इसलिए यहाँ कृषि बुरी तरह प्रभावित होती है। यदि जल संरक्षण किया जाए तो यह कृषि हेतु सिंचाई और विद्युत उत्पादन में बेहद लाभदायक सिद्ध होगा। संरक्षित जल सिंचाई में प्रत्यक्ष रूप से सहायक होगा, और जल से बनाई गई विद्युत भी ट्यूबवैल इत्यादि के माध्यम से भूमिगत जल उपलब्ध कराकर सिंचाई में सहायता करेगी। बहुत कम या बिल्कुल वर्षा न होने वाले समय में जीवन को जारी रखने के लिए जल-संरक्षण आवश्यक है। व्यर्थ पड़ा एक बड़ा भू-क्षेत्र जले के उचित उपयोग द्वारा उपजाऊ क्षेत्र में परिवर्तित किया जा सकता है । अतः जल संरक्षण हमारे देश के लिए आवश्यक है। |
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472. |
Why is the collection and utilisation of rainwater vitally important? वर्षा जल का एकत्रीकरण और उपयोग अत्यधिक महत्त्वपूर्ण क्यों है? |
Answer» Much of rainwater flows down into the sea. A large amount of rainwater flows waste and cause soil erosion. So we need to collect it wisely to provide water to all and to check soil erosion. Therefore its collection and utilisation are vitally important for a country’s economy. वर्षा का अधिकांश जल समुद्र में बहकर चला जाता है। वर्षा जल की बड़ी मात्रा व्यर्थ ही बह जाती है एवं मृदा अपरदन करती है। इसलिए हमें सभी को जल उपलब्ध कराने के लिए एवं मृदा अपरदन को रोकने के लिए इसका बुद्धिमत्तापूर्वक संग्रहण करना आवश्यक है। इसलिए देशकी अर्थव्यवस्था के लिए, इसका एकत्रीकरण और उपयोग अत्यधिक महत्त्वपूर्ण है। |
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473. |
Water is the basis of life. Elaborate with reference to human, animal and plant life. जल जीवन का आधार है । मानव, पशु व वनस्पति जीवन के सन्दर्भ में इस कथन की व्याख्या कीजिए। |
Answer» Every human being, every animal and every plant contains a substantial proportion of free or combined water in its body. No kind of physiological activity is possible in which water does not play an essential part. Water is necessary for human as well as animal life to let it go on. The same way, moisture in the soil is equally necessary for the life and growth of plants. Thus water is the basis of life both directly and indirectly. All types of vegetation need water to grow and to flourish. Then all animals drink water and also take it in the form of plants as their food. So it happens with all humans. They also can’t live without water. Besides, they take in the water when they eat plants as their food. प्रत्येक मनुष्य, प्रत्येक पशु और प्रत्येक पौधे के शरीर में स्वतन्त्र अथवा यौगिक के रूप में जल की पर्याप्त मात्रा होती है। ऐसी कोई भी शारीरिक गतिविधि सम्भव नहीं है जिसमें जल की आवश्यक भूमिका न होती हो। जल मनुष्य व पशु जीवन को बनाये रखने के लिए आवश्यक है। इसी प्रकार पौधों के जीवन व वृद्धि के लिए मिट्टी में नमी भी उतनी ही आवश्यक है। इस प्रकार जल प्रत्यक्ष व अप्रत्यक्ष दोनों रूपों से जीवन का आधार है। प्रत्येक प्रकार की वनस्पति को उगने व फलने-फूलने के लिए जले आवश्यक होता है। फिर सभी पशु जल पीते हैं और पौधों के रूप में अपने भोजन में भी जल ग्रहण करते हैं। ऐसा ही मनुष्यों के साथ भी होता है। वे भी जल के बिना जीवित नहीं रह सकते। इसके अलावा, भोजन के रूप में पौधों को खाकर भी वे जल ग्रहण करते हैं। |
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474. |
What are the successive steps in the process of soil erosion? मृदा अपरदन की प्रक्रिया के क्रमशः चरण क्या हैं? |
Answer» The earliest steps in the process of soil erosion generally go unnoticed. Then the soil is cut up and washed away and deep gullies and ravines are seen in the earth. Thus a very precious layer of soil is washed away. मृदा-अपरदन की प्रक्रिया के सबसे प्रारम्भिक चरणों पर सामान्यतः किसी का ध्यान नहीं जाता है । फिर मिट्टी कटकर बह जाती है और जमीन में गहरी नालियाँ एवं कन्दराएँ सी दिखाई देने लगती हैं । मिट्टी की बहुत मूल्यवान परत बह जाती है। |
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475. |
State whether the following statements are True or False. Write ‘T’ for true and ‘F’ for false: 1. Water has the power to carry silt. 2. Water has played an important role in shaping the course of the earth’s history. 3. Water is not the basis of life. 4. Conservation of water and afforestation are not connected with each other. 5. Soil erosion is harmful to successful agriculture. |
Answer» 1. (True) 2. (True) 3. (False) 4. (False) 5. (True) |
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476. |
What are the major uses of water for the development of modern age? आधुनिक युग के विकास के लिए जल के मुख्य उपयोग क्या-क्या हैं? |
Answer» Water is no doubt the elixir of life as it is essential to sustain all kinds of plant, animal and human life. Along with this life-giving quality, water has great potential as a means of development of modern age. The harnessing of water supplies makes possible the development of hydroelectric power. The availability of electric power makes a big difference in the quality of life. It enables the economy to be improved in various directions. In particular, it enables underground water to be tapped to a great extent. Water also provides the cheapest form of transport by boats and barges within a country. This type of transport is not only cheap but also good for the environment as it does not cause any kind of environmental pollution. Thus water is very useful for the development of modern age. जल निस्सन्देह जीवन का अमृत है क्योंकि यह सब प्रकार के वनस्पति, जीव वे मानव-जीवन के लिए आवश्यक है। जल में इस जीवनदायी विशेषता के अतिरिक्त आधुनिक युग के विकास कार्यों की भी बड़ी सम्भावनाएँ हैं। जल आपूर्ति के साधनों पर नियन्त्रण से जल-विद्युत शक्ति का विकास सम्भव होता है। विद्युत-शक्ति की उपलब्धता से जीवन की गुणवत्ता में बड़ा अन्तर आता है। विशेष रूप से, इससे भूमिगत जल का बड़ी मात्रा में उपयोग सम्भव होता है। जल नावों वे डोंगियों के द्वारा किसी देश के अन्दर सबसे सस्ता यातायात उपलब्ध कराता है । इस प्रकार का यातायात सस्ता होने के साथ ही पर्यावरण की दृष्टि से भी उत्तम है क्योंकि यह किसी प्रकार का पर्यावरणीय प्रदूषण उत्पन्न नहीं करता है। इस प्रकार जल आधुनिक युग के विकास के लिए बहुत उपयोगी है। |
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477. |
Describe the formation of silt by river water. नदी के पानी के द्वारा गाद बनने की प्रक्रिया का वर्णन कीजिए । |
Answer» Rivers carry fairly large and heavy particles with their floodwater. Flowing with water too long distances, these particles are rubbed together. This way they turn into very fine quality clay silt. नदियाँ अपने बाढ़ के पानी में काफी बड़े व भारी कण बहाकर ले जाती हैं । लम्बी दूरी तक पानी के साथ बहते हुए ये कण आपस में रगड़ते रहते हैं। इस प्रकार वे बहुत उत्तम गुणवत्ता की मिट्टी या गाद में परिवर्तित हो जाते हैं । |
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478. |
Water is the basis of life’- how? ‘जल जीवन का आधार है’-कैसे? |
Answer» All animals, human beings and plants contain a substantial proportion of water in some of the other form. No physiological and agricultural activity is possible without water. Thus water is the basis of life. सभी जानवरों, मनुष्यों, और वनस्पतियों में किसी न किसी रूप में पर्याप्त मात्रा में जल विद्यमान रहता है। कोई भी जैविक व कृषि सम्बन्धी क्रिया जल के बिना सम्भव नहीं है। इस प्रकार जल जीवन का आधार है। |
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479. |
What happens when silt-laden water gets mixed with the salt water of the sea? जब गादयुक्त मटमैला जल समुद्र के खारे जल से मिलता है तो क्या होता है? |
Answer» When the silt-laden water of the river mixes with the salt water of the sea, rapid precipitation of the suspended matter takes place. And we see the water changing colour. जब नदी का गादयुक्त मटमैला जल समुद्र के खारे जल से मिलता है तो जल में घुले पदार्थों का अवक्षेपण तेजी से होता है, और हम जल को रंगे बदलते हुए देखते हैं। The rapid precipitation of the suspended matter takes place when the silt laden water mixes with salt water of sea.Explanation: the colour of water changes successively the muddy red or brown colour of silt through varying shades of yellow and green finally changes into the blue colour of the sea. |
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480. |
What are the measures suggested to check soil erosion? मृदा अपरदन की रोकथाम हेतु क्या उपाय सुझाये गए हैं? |
Answer» The measures suggested checking soil erosion are terracing of land, the construction of bunds to check the flow of water, the practice of contour cultivation, and the planting of appropriate vegetation. मृदा अपरदन की रोकथाम हेतु सुझाये गये उपाय हैं- भूमि को सोपानकृत करना, जल बहाव रोकने हेतु बन्धों का निर्माण, सीढ़ीदार खेती करना, और उपयुक्त वृक्षारोपण। |
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481. |
What is sewage? Explain why it is harmful to discharge untreated sewage into rivers or seas? |
Answer» 1. All the waste water released by homes, industries, hospitals, offices and other users are collectively called Sewage. 2. Sewage is a liquid waste. 3. Most of it is water, which has dissolved and suspended impurities, disease-causing bacteria and other microbes. These impurities are called contaminants. 4. If this is discharged into canals, it causes a lot of harm to animals, human beings, aquatic animals and plants if this water used. |
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482. |
Fill in the blanks and give reasons. a) Cleaning of water is a process of removing ………… b) Waste water released by houses is called c) Dried ………… is used as manure. d) Drains get blocked by ………… and ………… ………… |
Answer» a) Impurities – This is to remove the wastage to get purified water. b) Sewage This is a liquid waste which causes harmful bacteria and other microbes. c) Sludge – The soft wet earth or subtances which are used as manure. d) Oil and fat The impurities stagnated in water which releases some oil and fats like fossil fuels. |
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483. |
Worlds water day is on A) 22nd March B) 20th March C) 22nd April D) 20th April |
Answer» Correct option is A) 22nd March |
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484. |
What happens when sodium is dipped in water? |
Answer» Sodium piece rushes here and there reacting with water violently. It gradually diminishes in size and finally disappears. It dissolves in water forming sodium hydroxide and hydrogen. |
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485. |
What is the source of Waste water ? |
Answer» Wastewater is generated at homes, industries, etc. by different human activities. |
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486. |
Write the equation for the reaction between potassium and water. |
Answer» 2k + 2H2O → 2kOH + H2 ↑ |
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487. |
How was the well dug? |
Answer»
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488. |
What is sewage ? |
Answer» All the wastewater released by homes, industries, hospitals, offices, and other users is collectively called Sewage. Sewage is a liquid waste. Most of it is water, which has dissolved and suspended impurities, disease-causing bacteria, and other microbes. |
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489. |
What happens when water is heated? |
Answer» When we heat water, it turns into water vapour. |
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490. |
Have you seen a bore well being dug? Write the process. |
Answer»
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491. |
Rusting is quick in rainy season why? |
Answer» Rusting is quick in rainy season because the humidity will be more in rainy season, which promote rusting.. |
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492. |
We depend on _____for water. |
Answer» We depend on rain for water. |
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493. |
What are the content of sewage water ? |
Answer» Sewage water contains inorganic, organic, and bacterial as well as other microbial contaminants. |
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494. |
What are changes in rainy and summer season? |
Answer» The water levels in wells or other water sources go up during the rainy season and down during the summer season. |
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495. |
Solid-state of water is present in ………………….. A) Oceans B) Rivers C) Glaciers D) Mountains |
Answer» correct option is C) Glaciers |
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496. |
Can you convert water into ice? Explain what should we do. |
Answer» Yes. We can convert water into ice. Fill the ice cube box with water and kept it in the refrigerator for some time. After some time, the water converts into ice. |
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497. |
What happens if ice is kept in the open air? |
Answer» If we kept ice in the open air it melts and converts into water. |
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498. |
What is sewage ? |
Answer» Sewage is a liquid waste. |
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499. |
What is biological process ? |
Answer» Aeration causes organisms that break down waste to grow faster thus it leads to what is called a ‘Biological process’. |
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500. |
Which of the following process convert water into ice? A) Condensation B) Precipitation C) Evaporation D) Transpiration |
Answer» correct option is A) Condensation |
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