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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.
| 59401. |
Why blue colour of copper sulphate crystals disappear on heating |
| Answer» Copper sulphate crystals contain water of crystallisaton. Water of crystallization is the fixed number of water molecules present in one formula unit of a compound. Copper sulphate crystal contains five water molecules in one formula unit. When we heat the copper sulphate crystals then this water is removed and the colour of crystals turn white. | |
| 59402. |
s chand book all exercise solution |
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| 59403. |
Why aquatic plants do not survive in deep water |
| Answer» | |
| 59404. |
How to digest fat, protien, carbohydrates in human body |
| Answer» Digestion and absorption of carbohydrates : Carbohydrates are one of the basic nutrients in the human diet. There are two types of carbohydrates that can be digested by the human digestive system– sugar and starch. Sugar is broken down in the GI tract by the small intestine and three enzymes present in the mouth namely, Lactase, Sucrase, and Maltase.Digestion and Absorption of Proteins: Proteins are extremely important for the growth and replenishment of body cells and tissues. The digestion of proteins takes place in the stomach with the help of protease and pepsin enzymes, which breaks down the proteins into amino acids. The process is facilitated by the hydrochloric acid present in the stomach.\xa0 | |
| 59405. |
how does the resistance of wire vary with its area of cross section? |
| Answer» The resistance of a conductor is inversely proportional to its area of cross section. | |
| 59406. |
Write any two advantages and disadvantage of nuclear power plant |
| Answer» Advantages: Space needed for operating a nuclear power plant is less as compared to other conventional power plants for production of same amount of energy. .Further the nuclear power plants will conserve the fossil fuels such as coal, oil, gas etc. for other energy need. There is increased reliability of operation. | |
| 59407. |
Explain the working of nuclear power plant |
| Answer» | |
| 59408. |
Why is calcium sulphate hemihydrate called plaster of paris? |
| Answer» Plaster of Paris gets its name from large gypsum deposits in Montmartre in Paris. We know that plaster of Paris, which is chemically calcium sulphate hemihydrate is obtained by heating gypsum. So the origin of the name \'Plaster of Paris\' is the fact that the source material gypsum is found in large deposits at Montmartre in Paris. | |
| 59409. |
What is the role of acid in digestion |
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Answer» 1) It converts PH ions into acidic form so that digested enzyme can work on it. 2) It kills bacteria. Make food acidic to activate pepsin, help to kill microorganisms if present in food |
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| 59410. |
what causes muscle cramps during heavy activity |
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Answer» During heavy activity our body requires more energy and due to insufficient supply of oxygen it does anaerobic respiration to full fill it\'s demand. • muscle cell respire anaerobically and breakdown of glucose produces lactic acid. • accumulation of lactic acid causes muscle cramps. Formation of lactic acid due to anaerobic respiration occur in insufficient supply of oxygen in cells |
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| 59411. |
What happens to the crystal of washing soda when exposed to air ? |
| Answer» Chemical formula of washing soda is Na2CO3.10 H2OWhen sodium carbonate crystals are exposed to air They lose water of crystallization and turn to white powder. This process of loosing water of crystallization when exposed to air is called efflorescence.Na2CO3 .10H2O → Na2CO3 + 10 H2O | |
| 59412. |
How are oxygen and carbon dioxide in humman beings? How are lungs designl |
| Answer» Exchange of gases takes place between the alveoli of lungs and the surrounding blood capillaries. The two main gases exchanged are oxygen and carbon-dioxide. Oxygen is absorbed by the blood capillaries from the lungs alveoli by diffusion while carbon-dioxide is absorbed by the lungs alveoli from blood capillaries by diffusion.\xa0Transport of oxygen and carbon-dioxide occurs with the help of respiratory pigment called hemoglobin.Hemoglobin, the iron containing respiratory pigment is a red colored pigment of blood, which has a very high affinity for oxygen. Hemoglobin though is purple colored but oxy-hemoglobin is of bright red color. Oxygen is transported from lungs to the body cells in the form of oxy-hemoglobin.Carbon-dioxide is transported from the body cell to the lungs in the forms of carboxy-hemoglobin, carbonic acid, bicarbonates of sodium and potassium. | |
| 59413. |
what is valence electron? |
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Answer» The numbre of electron present in outermost orbit is calleld valance electron The number of electron present in outermost (last) orbit of an atom is called as valence electrons. |
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| 59414. |
30 oxidation reactions |
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| 59415. |
Inner surface of cut ball is which type of mirror? |
| Answer» If inner surface of cut ball is considered as reflecting then it wil be concave mirror. | |
| 59416. |
How is carbohydrates, fats and protein digested in the human digestive system |
| Answer» It is digest by hcl and bile juice | |
| 59417. |
Fill in the blanks organc. Exiyms. FunctionLiver small intestine stomach mouth panceres |
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| 59418. |
Physics chapter 5 numerical |
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| 59419. |
When do we call a body has positive charge |
| Answer» When it loses an electron. | |
| 59420. |
What are the two types of autotrphism and their difference? |
| Answer» The two types of Autotrophism are Photoautotrphism and Chemoautotrophism.Photoautotropism :-- The process of food preparation by the help of the energy got by sunlight ☀ in order to make organic compounds.Ex : PLANT, CYANOBACTERIA(BLUE GREEN ALGAE) and etc.Chemoautotrophism :--The process of obtaining energy from the inorganic chemical processes.Ex : PROTEOBACTERIA, GAMMAPROTEOBACTERIA and etc. | |
| 59421. |
Why combustion can be oxidation |
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Answer» What Combustion is the complete oxidation of organic compound into carbon dioxide and water molecules in presence of oxygen gas whereas oxidation is the addition of oxygen in a compound or addition with an element. It is also defined as reaction in which there is loss of electron from an atom or ion. Combustion reactions involve heat and light whereas oxidation reaction does not involve heat. All combustion reactions are oxidizing since they absorb Oxygen for the reaction to take place but all oxidation reactions are not combustion reactions. |
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| 59422. |
Why red litmus change into blue and why blue litmus change into red |
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Answer» Litmus is extracted from lichens. It has a mauve (purple) colour in distilled water.When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. So, it is used to test the acidic or basic nature of solutions. Due to the solution of base and acid Red litmus changes into blue if the solution taken is a base.Blue litmus changes into red if the solution taken is an acid |
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| 59423. |
Observe the image of a distant object say a distant tree in a plane mirror |
| Answer» Virtual and erect laterally inverted | |
| 59424. |
Notes on pollution with diagram |
| Answer» Pollution can be defined as the introduction of substances that contaminates the environment and cause adverse effects on the natural surrounding. Pollution not only damages the ecology but also affects the living conditions of living beings to a great extent. The substances that cause pollution are called pollutants which can be solid, liquid or gases.The major forms of pollution include land, air and water. In recent times, noise, light and plastic pollutions are also garnering huge attention from the environmentalists. Each of these types is explained below.\tWater Pollution: The contamination of water bodies with harmful pollutants refers to water pollutions. The introduction of contaminants is generally due to human activities like improper sewage treatment, oil spills in water bodies, etc.\tAir Pollution: Air pollution refers to the addition of contaminants (chemicals, harmful gases, particulates, biological substances, etc.) in the atmosphere which pose a great threat to both society and health.\tSoil Pollution: Soil pollution, also called soil contamination refers to the degradation of land due to the presence of chemicals or other human-made substances in the soil. The xenobiotic substances alter the natural composition of soil and affect it negatively.\tNoise Pollution: Noise pollution is generally man-made and refers to the excessive amount of noise in the surrounding that causes disruption in the natural balance. In terms of decibels, noise is a sound which is above 80 decibels. | |
| 59425. |
Why are most carbon compounds poor conductor of electricity |
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Answer» Carbon compounds are poor conductors of electricity as they form a covalent bond and thus so it does not give rise to free electrons or ions in aqueous solution. Because most carbon compounds did not have free electron |
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| 59426. |
What is the total resistance in the given figure |
| Answer» The circuit please | |
| 59427. |
How is the principal of eledtric motar |
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Answer» Electric motor is a device that converts electricity into mechanical energy.\xa0Working principle of electric motor: \xa0Electric motor works on the principle that when an insulated conductor coil is placed in a magnetic field and the current is passed through it, a force acts on the coil which rotates continuously. When a current carrying conductor is placed in an external magnetic field , then it experiences a torque (force) which rotates the conductor. Sorry electric motar |
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| 59428. |
About types of respiration |
| Answer» Aerobic and ana | |
| 59429. |
What is differntiation ? |
| Answer» The action or process of differentiating or distinguishing between two or more things or people. | |
| 59430. |
How does the resistance of a wire vary with its :(a) area of cross-section ?(b) diameter ? |
| Answer» Resistance is inversely proportional to the area of cross section of the wire. The more the area of cross section of the wire,the less is the resistance and the less the area,the more is the resistance.If the diameter of the current carrying conductor or wire will be more, then the electrons will get more space to move through the conductor. So if the diameter increases, then the resistance decreases. So, yes, resistance varies with diameter. | |
| 59431. |
Give one example to show how the resistance depends on the nature of material of the conductor . |
| Answer» Copper wire conducts more than a silicon wire, this is due to the nature of the material of the conductor. | |
| 59432. |
Chapter 1st balance the equation NH3+O2 - NO+H2O |
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Answer» 2NH3+4O2- 2NO+3H2O Sorry shivansh handa aapka abhi bhi sahi nahi h Sorry my first balance equation was wrong and these was right balance equation 2NH3+4O2-2NO+3H2O 2NH3+3O2-2NO+H2O |
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| 59433. |
When zinc react with hydrochloric acid it gives? |
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Answer» Zinc granules give hydrogen gas; along with zinc chloride; when they react with hydrochloric acid.Zn + 2HCl → ZnCl2 + H2OThus, when hydrochloric acid is used at the place of sulphuric acid, zinc chloride is formed in place of zinc sulphate; along with hydrogen gas and reaction takes place at the same rate. Zinc cholride and hydrogen gas |
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| 59434. |
Though bile juice contains no digestive enzymes, but is important for the digestion of food. Explain |
| Answer» Bile juice contains no digestive enzymes, yet it is important for digestion. ... Bile juice has bile pigments such as bilirubin and biliverdin. These break down large fat globules into smaller globules so that the pancreatic enzymes can easily act on them. | |
| 59435. |
Explain the statement बिल does not contain any enzyme but it is essential for digestion |
| Answer» Bile does not contain any enzyme but it is essential for digestion because bile is alkaline and contain salts which helps to emulsify the fat present in the food. So, the\xa0bile perform two functions:\tThe food coming from the stomach is acidic and has to be made alkaline for the pancreatic enzymes to act.\tThe bile salts breakdown the fat present in the food into smaller globules. This increases the efficiency of enzymes in the small intestine to digest the food effectively. | |
| 59436. |
Aluminum is reactive metal but is still used for packing food articles |
| Answer» Because it wrap the food...so it is resist from environment nd soo oxygen couldn\'t pss through it nd by this food can\'t get contaminated. | |
| 59437. |
Acid nd base???? |
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Answer» ACIDS# sour in taste.# produced H+ ions when soluble in water.BASE# bitter in taste.# produced OH- ions when soluble in water सावर इन टेस्ट कॉल्ड एसिड एंड बिटर इन टेस्ट कॉल्ड बेस Substance which release H+ ions in aqueous solution are called acids.......Substances which release OH- ions in aqueous solution are called bases Acids are sour in taste and base are bitter in taste Hi |
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| 59438. |
Define acid and bases |
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Answer» Acida are substances which are sour in taste and turns blue litmus red and base are substances which are bitter in taste and turns red litmus blue An acid is a material that can release a proton or hydrogen ion (H +). Hydrogen chloride in water solution ionizes and becomes hydrogen ions and chloride ions. If that is the case, a base, or alkali, is a material that can donate a hydroxide ion (OH-). |
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| 59439. |
Which type of movement present in oesophagus |
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Answer» Peristaltic movement The muscular movement that pushes the food down the oesaphagus is called peristalsis. Peristaltic movement Peristalti movement that is the step by step movement Peristalis movement Peristolic movement in present |
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| 59440. |
Balance this equation:- MNO2+HCl----- MNCl2+CL2+H2O |
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Answer» MNO2+4HCl→MNCl2+Cl2+2H2O MNO2+4HCL---------MNCl2+Cl2+2H2o MNO2+4HCl---- MNCl2+Cl2+H2O |
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| 59441. |
Solve minimum 15 numerical que. Related to electiv energy and heating effect of current |
| Answer» | |
| 59442. |
Please send me cbse answer key of science class 10 2019 all set |
| Answer» Check the solutions with papers here :\xa0https://mycbseguide.com/cbse-question-papers.html | |
| 59443. |
Can somebody say me the simple meaning of saprotrophic ,parasitic and holozic nutrition? |
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Answer» Saprophytic organisms absorb nutrients from dead matter.For ex-yeast mouldsParasite organism obtained nutrient From other organisms.Ex-tapeworm,leecheHolozoic organosm taking food called ingestion and food Nutrients absorb by body CellEx-dog,human The organisms which depend upon the dead and decaying matter for their nourishment (livelihood) are termed as SAPROPHYTES. Such mode of nutrition is called saprophytic mode of nutrition. For ex :— ?MUSHROOM?The organisms which depend upon other host organisms either inside or outside the body of the hosts for their nourishment are termed as PARASITES. Such nutrition is called parasitic nutrition.For ex :— MOSQUITOES.The mode of nutrition in which the organisms digest either solid or liquid inside the body through enzymes and other medium is termed as HOLOZOIC NUTRITION. For ex:— Humans,Amoeba. Saprotrophs are those organisms which feed on dead organic matter and this mode of nutrition id known as saprophytic mode. Saprotrophic organisms have no chlorophyll and hence, cannot make their own food. For example- mushroom, yeast.Parasitic- Organism that derive nutrients by living in or on their host are known as parasites and the mode of nutrition is known as parasitic mode of nutrition. For example- Cuscutta.Holozoic:- Those organism (like amoeba) which take their food in solid/liquid form and digest it inside their body, this mode of nutrition is known as holozoic. Saprophytes (plants) are those who feeds on dead ans decade matter. This type of nutririon is called saprophytic nutrition.Parasitic is the mode of nutrition in which organisms obtain thrir food from their HOST , eg.cascutta etc.Holozoic mode of nutrition is the type of nutrition in which organism takes in the complex food in their body and digest it . Inside and obtain energy. |
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| 59444. |
How much valve are present in the Heart |
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Answer» 4 Name of them are V1and V2 is inlet valve.V3 and V4 is outlet valve Four |
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| 59445. |
Send any innovative working model of science one in all very new . |
| Answer» | |
| 59446. |
Double displacement reaction? |
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Answer» The reaction in which two substance are react and exchange his ion and form a new substance is called Double Displacement Reactions Those reaction in which two compounds react by an exchange of ions to form two new compound are called double displacement reaction. The reactions in which there is an exchange of ions between the reactants are called double displacement reaction. |
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| 59447. |
What is nutrion? |
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Answer» Nutrion are defined the process in which obtained food to get complete our body required such as to obtained energy,repair our body structure and growth The process of providing or obtaining the food necessary for health and growth. |
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| 59448. |
Why enzymes are inactive form even when there is no food in our stomach |
| Answer» Because of HCL acid | |
| 59449. |
Why our body become hot in fever |
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| 59450. |
What is fullfom of ATP |
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Answer» Adenosine Tri phasphote Adenosine Tri-Phosphate Adenosine Triphosphate Adenosine Triphosphate..!! Adenosine Triphosphate |
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