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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.
| 901. |
School kab kulege |
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Answer» Nobody knows !!!!!! Pata nahin bro Pray buddy; all that i can say. |
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| 902. |
Are acids always aqueous |
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Answer» Dilute acids do not contain water and hence no H+ ions are released. No they are not. In reactions we generally take aqueous solution of acids because there they release H+ ions. |
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| 903. |
Which isotope is used in the treatment of cancer? |
| Answer» Yttrium-90 | |
| 904. |
Name any 2 small units of mass |
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Answer» \xa0gram (g) and miligram (mg) is a very small unit of mass. Hydrogen and helium Hydrogen helium |
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| 905. |
Explain nutrition in human body. |
| Answer» \xa01. In humans, digestion of food takes place in the alimentary canal, made up of various organs and glands.2. In the mouth, food is crushed into small particles through chewing and mixed with saliva, which contains amylase for digesting starch.3. Food passes through the pharynx and oesophagus to reach the stomach. Gastric juice contains pepsin (for digesting proteins), HCl and mucus.4. In the small intestine, carbohydrates, proteins and fats are completely digested into glucose, amino acids, fatty acids and glycerol.5. The villi of the small intestine absorb the digested food and supply it to every cell of the body.6. The undigested food is removed from the body through the ****. | |
| 906. |
What happen when metal react with water |
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Answer» Metal oxide and hydrogen gas is formed Metal oxide and hydrogen gas is formed When metal react with water it forms metal hydroxide and hydrogen gas. Metals\xa0form respective\xa0metal\xa0hydroxide and hydrogen gas when they\xa0react with water. Most of the\xa0metals\xa0do not\xa0react with water. However, alkali\xa0metals react\xa0vigorously with\xa0water. |
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| 907. |
What is watt?please do not send from google. |
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Answer» When an electrical appliance consumes electrical energy at the rate of 1 J per second , its power is said to be 1 watt1watt= 1volt × 1 ampere When an electrical appliance consumes electrical energy at the rate of 1 joule per second, its power is said to be 1 watt.1 watt = 1 volt x 1 ampere |
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| 908. |
Watt is inversely or directly proportional to resistance? |
| Answer» Inversaly | |
| 909. |
What is meant by:Electric charge is quantized??? |
| Answer» Quantization of charge implies that charge can assume only certain discrete values. That is to say the observed value of electric charge (q) of a particle will be integral multiples of (e)\xa01.6×10−19\xa0coulombs.i.e.q=ne\xa0where\xa0n=0,1,2,....\xa0(both positive and negative integers)The charge cannot assume any value between the integers.\xa0 | |
| 910. |
Actually who discover electricity? |
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Answer» Sir William Gilbert \xa0The first person to write a scientific account of electric effects was Sir William Gilbert(1504-1603). Gilbert\'s experiments led to a number of investigations by many pioneers in the development of electricity technology over the next 350 years.He put forward the name electrica for substances like amber (yellow resinous substance found on the shores of the Baltic sea) which when suitably rubbed attracts light bodies.\xa0It is the ancient Greeks who have observed that amber when rubbed with wool acquires a property that attracts light objects to it.It is Thales of Miletus whose scientific inquisitivenss is said to have known amber and its property.(600 BC)\xa0An American scientist Benjamin Franklin is known as the father of electricity(1706-1790).He performed the experiment of flying kite during a thunderstorm which led to the finding that lighting ang electricity is related which led to the invention of lightening rods.\xa0Later in 1800, Italian-born physicist Alessandro Volta constructed the voltaic pile,later known as the electric battery, the first device to produce a steady electric current.He found that certain chemical reactions could produce electricity.The credit for generating electric current on a practical scale goes to the famous English scientist, Michael Faraday.He found out that electricity could be produced through magnetism by motion.\xa0Thomas Alva Edison invented the\xa0practical incandescent light bulb |
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| 911. |
Define about garbage disposal |
| Answer» Waste disposal means removing, discarding, recycling or destroying unwanted materials called waste that is produced from agriculture, domestic usage or industrial products. Following the correct methods for waste disposal will ensure lesser pollution and hazards for the environment. Proper waste management is necessary with steps involving proper collection of waste and scientific treatments that may contribute less to water pollution, soil pollution and air pollution.Wastes can be of numerous types and much of the waste generated today is non-biodegradable waste. Globalization and industrialization have contributed to this hugely. The dumps with harmful substances in the waste can release toxic fumes and smoke. Therefore, the correct disposal for the particular kind of wastes is necessary, for example burning all kinds of wastes may lead to the above problem and cause harm to bodies. Also, dumping into rivers and filling land depressions without proper administration is not encouraged. Wastes including plastics, batteries, sanitary and oil products should be properly disposed of. Doing so may result in a hazardous environment and polluted atmosphere.\xa0Methods of Waste Disposal\xa0The various methods of waste disposal known are as follows:\t\tLandfill\t\t\tIncineration\t\t\tBiogas Generation\t\t\tComposting\t\t\tWaste compaction\t\t\tVermicomposting\t | |
| 912. |
What are pathogens |
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Answer» Pathogens are the micro-organisms that use to cause diseses in animals and plants as well as in humans. Eg- female anopheles which cause malaria in humans. Pathogens are microscopic organisms which causes disease in humans,plants or animals. Eg. Bacteria virus etc. Pathogens are bacterium, virus, or other microorganism that can cause disease. |
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| 913. |
write briefly about micro propagation ( tissue culture) |
| Answer» Micropropagation is the artificial process of producing plants vegetatively through tissue culture or cell culture techniques. In this artificial process of propagation, plants are produced invitro by asexual means of reproduction or by vegetative propagation.Plants can be produced both asexually i.e, via vegetative parts’ multiplication or sexually i.e., seed production. One of the means of asexual reproduction is by multiplying genetic replicas of plants that are referred to as clonal propagation wherein plants can be populated from a single individual through asexual means of reproduction.For the in vivo propagation of specific plants, asexual reproduction via multiplication of vegetative parts is the only resort since they do not generate functional seeds as seen in figs, grapes, bananas etc. Successful application of clonal propagation to the following is observed: potato, apple and many other ornamental plants. | |
| 914. |
How does plasmodium multiply ? Also draw it\'s diagram. |
| Answer» \xa0\tPlasmodium completes its life cycle in two hosts, therefore, it is called digenetic endoparasite.\tMan is its primary host in which it completes its asexual cycle.\xa0\tFemale\xa0Anopheles\xa0mosquito is its vector or secondary host in which it completes its sexual cycle.\tSporozoites are present in the salivary glands of female\xa0Anopheles\xa0mosquito.\tThey enter the human blood and reach the liver cells.\tIn liver cells, the sporozoites undergo asexual multiple fission and form new cells called merozoites.\tLiver cells burst out to release the merozoites.\tThese merozoites enter the RBCs and start the erythrocytic phase.\tMerozoites pass through trophozoite stage and\xa0signet ring trophozoite stage.\tSignet ring trophozoite ingests proteins of the cytoplasm of RBCs.\tIt forms food vacuoles inside which it secretes digestive enzymes.\tThese enzymes proteolysed blood haemoglobin and break it into protein globin and haematin pigment.\tGlobin protein gets digested by the trophozoite.\tUnused haematin forms malarial pigment called haemozoin.\tTrophozoite increases in size and becomes rounded called schizont.\tSchizont undergoes multiple fission and forms many daughter nuclei.\tHaemozoin granules accumulate in the cytoplasm of RBCs.\tRBCs burst to release merozoites and the haemozoin granules.\tThe release of haemozoin granules causes malarial fever.\tMerozoites lose the ability to reproduce and thus form gametes.\tThese gametes enter the female Anopheles mosquito.\tMale and female gametes undergo fertilization to form immobile zygotes\xa0\tLater zygotes become worm-like and motile called ookinete which pierces peritrophic membrane and reach the outer layer of the stomach.\tThe ookinete becomes rounded and encloses itself in a cyst and is called oocyst.\tOocyst takes nutrients from the wall of the stomach and increases in size.\tOocyst undergoes mitotic division and forms many micro daughter nuclei.\tIn the cytoplasm, large irregular non-contractile vacuoles are formed.\tDaughter nuclei arrange around the surface of the vacuoles and get enclosed by cytoplasm.\tInside oocyst, many lobes of cytoplasm are formed with the nucleus at its centre.\tEach lobe converts into the spindle-shaped structure and hangs down in the oocyst.\tOocyst bursts and sporozoites become free in the haemocoel.\tSporozoites swim in the haemolymph and reach salivary glands of the mosquito. | |
| 915. |
Explain the human respiratory system? |
| Answer» \xa0\tRespiratory system is responsible for the process of respiration. It involves exchange of gases, i.e, oxygen and carbon dioxide between body and surrounding. The body can\'t store oxygen, so, it is vital process and it is occurs all the time.\tThe body takes up oxygen and passes it to whole body through blood.\tRespiratory system is divided into 2 major parts, upper respiratory tract and lower respiratory tract. \tUpper respiratory tract is composed of nose, pharynx and larynx.Nasal cavity traps the dust particles. Air passes to lungs through pharynx, and larynx is essential for speech\tLower respiratory tract is composed of the trachea, the lungs, and bronchioles including alveoli.\tTrachea is the main pathway to lungs. Lungs are main site of gaseous exchange, they gives oxygen to capillaries and exhale carbon dioxide, Bronchi supply the lungs with air. Bronchioles are the branches of bronchus. They further branches into primary and secondary bronchioles. And they finally terminate into alveoli. Diaphragm contracts and relaxes to allow air into the lungs. | |
| 916. |
What will happen if all deer removed from the given food chain? Plants---deer---tiger |
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Answer» The food chain is completely disturbed. The population of tiger decreases and the population of grass increasesDeer is a food for the tiger. If all the deer populations from the forest are removed , then there will be no sufficient food available to the tigers. Some of the tigers will die due to starvation and their population will decrease. This will disturb the food chain in which tigers operate. The hungry tigers can come out of the forest in search of food and may kill domestic animals or human beings. Since the deer are herbivorous, there absence will increase the grassland area also. This on the whole will disturb the balance of ecosystem. important question for class 10th biology 1st chapter |
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| 917. |
Explain ph scale and importance of ph scale in our daily life |
| Answer» “pH has a great importance in our daily life". This can be explained by the following examples-(i) Plants and animals are pH sensitive:\xa0Living organisms can survive only in narrow range of pH change.(ii) Tooth decay:\xa0Change in pH of our mouth causes tooth decay. Tooth decay start when the pH of mouth is lower than 5.5. Tooth enamel gets corroded when the pH in mouth is below 5.5.(iii) pH is our digestive system:\xa0(HCl) Hydrochloric acid is produced by our stomach that helps in the digestion of food. During digestion, if stomach produces too much acid, it will cause pain and irritation.(iv) pH of the soil:\xa0Plants require a specific pH range for their normal growth. | |
| 918. |
How is washing soda synthesized ? |
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Answer» All are copy paste natch Washing soda is synthesized through\xa0Solvay’s process.\xa0Solvay’s process involves the reaction of sodium chloride, ammonia and carbon dioxide in water. Carbon dioxide involved is produced through calcium carbonate and the calcium oxide left is used in recovering ammonia from\xa0ammonium chloride.At first, sodium bicarbonate is obtained which is then converted to sodium carbonate on heating. Finally, washing soda is produced by recrystallization of sodium carbonate.NaCl\xa0+\xa0NH3\xa0+\xa0CO2\xa0+\xa0H2O →\xa0NaHCO3\xa0+\xa0NH4Cl2\xa0NaHCO3\xa0→\xa0Na2CO3\xa0+\xa0H2O\xa0+\xa0CO2Na2CO3\xa0+ 10H2O →\xa0Na2CO3.10H2O soda is powder Washing soda is synthesized through\xa0Solvay’s process.\xa0Solvay’s process involves the reaction of sodium chloride, ammonia and carbon dioxide in water. Carbon dioxide involved is produced through calcium carbonate and the calcium oxide left is used in recovering ammonia from\xa0ammonium chloride.At first, sodium bicarbonate is obtained which is then converted to sodium carbonate on heating. Finally, washing soda is produced by recrystallization of sodium carbonate.\tNaCl\xa0+\xa0NH3\xa0+\xa0CO2\xa0+\xa0H2O →\xa0NaHCO3\xa0+\xa0NH4Cl\t2\xa0NaHCO3\xa0→\xa0Na2CO3\xa0+\xa0H2O\xa0+\xa0CO2\tNa2CO3\xa0+ 10H2O →\xa0Na2CO3.10H2O Washing soda is synthesized by the Solvay process.The\xa0steps\xa0are given below:\xa01. Sodium chloride(NaCl), ammonia( NH3) and carbon dioxide( CO2) are taken in water to form\xa0sodium bicarbonate( NaHCO3).2. Sodium bicarbonate is separated as it precipitates out from the solution as a solid. In presence of heat, it decomposes to form\xa0anhydrous sodium carbonate( soda ash).3.\xa0Recrystallization\xa0of the sodium carbonate obtained by dissolving in water.\xa0The process of formation of sodium carbonate is referred to as the Solvay process which is utilised to produce washing soda. |
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| 919. |
Any Insulator is show 100 Resistivity? |
| Answer» | |
| 920. |
What is binary acid |
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Answer» Copy paste batch \tBinary\xa0acids\xa0are certain molecular compounds in which hydrogen is bonded with a nonmetal.\tThe names of\xa0binary\xa0acids\xa0begin with "hydro-" followed by the name of the other element, modified to end with "-ic."\tBinary\xa0acids\xa0are one of two classes of\xa0acids, the second being oxoacids (or oxyacids), which consist of hydrogen, oxygen, and a third element, which is often a non-metal. |
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| 921. |
What is mitrocondria |
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Answer» Mitrocondria is the power house of the cell. Copy paste mat karo Mitochondria are round "tube-like" organelles that provide energy to a cell in the form of ATP (Adenosine Triphosphate) for performing different chemical activities for the sustainance of life.The mitochondria is also called powerhouse of the cell.It is surrounded by two membranes.\tThe outer membrane is porous wherea the inner membrane has deep folds that provides a large surface to perform the chemical reactions required for the generation of ATP.\tThe inner membrane is compartmentalized into various cristae.\tThe ground substance or space enclosed by inner membrane is called matrix.\tMitochondria have their own DNA and ribosomes and are hence capable to produce some of their required proteins all by themselves. |
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| 922. |
We can call holozoic nutrition as complex mode of nutrition |
| Answer» Holozoic nutrition can be defined as a method of nutrition which involves the ingestion of some complex organic substances that may be in the solid or the liquid state. Here, certain parts of some plants or some animals or the organism as a whole are ingested. In this type of nutrition, the complex food is transferred into a specialized digestive system where it is broken down into small pieces in order to be absorbed. The 5 crucial stages that holozoic nutrition can be broken down into include:\xa0ingestion, digestion, absorption, assimilation, and egestion. | |
| 923. |
Explain the structure and function of nephron with diagram. That bowman capsule and all. |
| Answer» Nephrons are the microscopic structural and functional unit of the kidney. Nephrons are composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman’s capsule.Structure of a Nephrons:\tNephrons are the basic filtering units of kidneys.\tEach kidney possesses large number of nephrons, approximately 1-1.5 million.\tThe main components of the nephron are glomerulus, Bowman’s capsule, and a long renal tubule. | |
| 924. |
What is the chemical properties of acids and bases |
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Answer» The chemical properties of acids\xa0\tAcids change the colour of litmus from blue to red.\tThey convert the colour of Methyl Orange from Orange/Yellow to Pink.\tAcids turn the pink colour of Phenolphthalein to colourless.\tAcids can conduct\xa0electricity.\tSome Acids are highly corrosive in nature which means that they corrode or\xa0rust metals.\tAcids tend to evolve\xa0hydrogen gas\xa0whilst reacting with an active metal such as\xa0Zn,\xa0Mg, etc.\tThey produce H+ ions when mixed with water.\tAcids lose their acidity when mixed with a base.\tWhen equal amounts of acid and base are combined the process of neutralization occurs and salt and water is formed,\tThe pH value of acid is from 0-6. Learn the\xa0concept of pH value\xa0here.\tAcids are sour in taste.\tAcids react with carbonates and hydrogen carbonates to form a salt, water, and carbon dioxide gas.\tExtremely active metals such as\xa0Potassium\xa0(K), Calcium (Ca),\xa0Sodium\xa0(Na), etc tend to explode when combined with acids.In the chemical properties of bases\xa0\tThey are bitter in taste.\tBases lose their basicity when mixed with acids.\tBases react with acids to form salt and water. This process is called\xa0Neutralisation Reaction(Read).\tThey can conduct electricity.\tBases feel slippery or soapy.\tSome bases are great conductors of electricity.\tBases like sodium hydroxide, potassium hydroxide, etc are used as electrolytes.\tAlkalis are bases that produce hydroxyl ions (OH-) when mixed with water.\tStrong alkalis are highly corrosive in nature whereas other\xa0alkalis\xa0are mildly corrosive. Metal+ acids---》salt +hydrogen gas Properties?on what basis? |
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| 925. |
Where to get good notes of acid bases and salts? |
Answer» \xa0Acids\t\tAcids is defined as the one which produces hydrogen ions in water.\xa0For Example, Sulphuric Acid, Hydrochloric Acid etc.\t\t\tThey give sour taste.\t\t\tAcids turn blue litmus to red. This is used as confirmation test for the presence of acid.\t\t\tWhen acids react with metals, gases are evolved.\tReactions with Acids1. Reaction of Acid with MetalAcid + Metal → Salt + Hydrogen gasMg + H2\xa0SO4\xa0→ H2\xa0+ Mg SO42. Reaction of Acid with CarbonatesNa2\xa0CO3\xa0(s) + 2 HCl (aq) → 2NaCl (aq) + H2O(l) + CO2(g)3. Reaction of Acid with BicarbonatesNaHCO3\xa0(s) + HCl (aq) → NaCl(aq) + H2O (l) + CO2\xa0(g)Similarity between Acids and Bases\t\tBoth acids and base react with water. They produce ions in water\t\t\tBoth acids and bases acts as electrolytes, so are good conductors of electricity.\t\t\tBoth of them changes the colour of the litmus paper.\t |
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| 926. |
What is a solvay process? What are various raw materials involved? |
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Answer» The Solvay Process is a continuous process using limestone (CaCO3) to produce carbon dioxide (CO2) which reacts with ammonia (NH3) dissolved in brine (concentrated NaCl(aq)) to produce sodium carbonate.The steps in the Solvay Process are:i. Brine Purificationii. Sodium Hydrogen Carbonate Formationiii. Sodium Carbonate Formation iv. Ammonia RecoveryThe solvay process uses salt\xa0(NaCl), limestone (CaCO3\u200b), ammonia(NH3\u200b) and coke(C)\xa0as the raw materials. the raw materials in the Solvay process are the following:\tSodium chloride (NaCl)\xa0or commonly known as purified brine\tCalcium carbonate (CaCO3)\xa0or commonly known as limestone\tCoke\tAmmonia |
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| 927. |
How theoretically can membrane filtration can achieve efficiency |
| Answer» The predominant removal mechanism in\xa0membrane filtration\xa0is straining, or size exclusion, where the pores are 0.01 micrometers or larger, so the process\xa0can theoretically achieve\xa0perfect\xa0efficiency\xa0regardless of parameters such as the solution\'s pressure and concentration.Benefits of membrane filtration\tLower overall production\xa0costs. Membrane filtration systems are often less expensive than many other alternative technologies. ...\tHigh flexibility. ...\tHigh end product quality. | |
| 928. |
What is the significance of the emulsification of fats? |
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Answer» \t\xa0Emulsification is the process of breaking down of the large fat globules into smaller globules and make them water soluble.\t\xa0Emulsification of fats takes place in the gut with the help of the bile juice produced in liver.\t\xa0It is necessary as it is difficult for the enzymes (lipases) to act on large fat globules.\xa0\t\xa0Emulsion of fats increases the efficiency of enzyme action to break down fats into fatty acids and glycerol which are easily absorbed through small intestines. Bile salts help in the breakdown of oil droplets into small globules forming a milky emulsion. This process is called emulsification. This process facilitates further digestion of fats.#hope it is helpful... |
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| 929. |
What are the type of reflection? |
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Answer» There are two types of reflection, Regular reflection Diffused reflection. Regular reflection: Parallel beam of light hits the reflecting surface and reflects parallely in same direction. Takes place in smooth and highly polished surfaces. Image is formed in this type of reflection. Ex : Reflection on a plane mirror .Diffused reflection: Parallel beam of light hits the reflecting surface and reflects irregularly in different direction. Takes place in rough surfaces . Image is not formed in this type of reflection. Ex : Reflection on a wooden surface Regular and irregular reflection |
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| 930. |
Why some people will get water in their legs what is the problem and where does the water stores |
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Answer» Not by sweat some get problems like the leg will e swelled more I think so the water may comes out in the form of sweat,or it will be in the body itself ????? |
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| 931. |
What is kideny made up off? |
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Answer» Is kideny is not made up of epithelial tissues Nephrons Each\xa0of\xa0your\xa0kidneys\xa0is\xa0made up of\xa0about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule nephron |
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| 932. |
What is backing powder |
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Answer» Sodium bicarbonate undergoes *decomposition* reaction.By mistake I have typed displacement reaction. Please ignore it? It is *baking powder* not *backing powder.*Answer:-Baking powder is a mixture of baking soda(NaHCO3) along with an edible acid (i.e. either tartaric acid or citric acid).Baking powder is added to food make it soft and spongy (fluffy).When the food material is baked or heated, sodium bicarbonate(NaHCO3) undergoes displacement reaction and forms Sodium carbonate(Na2CO3) along with carbon dioxide gas(CO2) and water vapour(H2O).NaHCO3(s)+ heat----> Na2CO3(s)+H2O(g)+CO2(g)The carbon dioxide gas and water vapour leaves pores in the food material which makes it soft and spongy (fluffy).The tartaric/citric acid present in the baking powder neutralizes the base sodium carbonate and forms a neutral salt which provides flavour to the food material. Is it baking powder or backing powder |
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| 933. |
Nature provision of neutralization option |
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| 934. |
Control and coordination chapter has been reduced by CBSE board or not ??? |
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Answer» According to the syllabus of class 10 2020-2021 controy and coordination chapter has deductedw Yes, Control and Co-ordination Chapter has been reduced by CBSE Yes full chapter is deleted from cbse class 10th Yes, control and coordination chapter had been reduced by CBSE |
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| 935. |
Why do herbivores have longer, small intestine than carnivores? |
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Answer» Beacaue herbivores have to digest cellulose but but in carnivores. meat is digested easily Herbivore have large small intestine to digest much complex cellulose. Herbivores have longer small intestine to allow the cellulose to be digested completely. Herbivores have longer intestine than carnivores to digest grass. The intestine would host many small bacteria that process and breakdown cellulose into glucose.#Hope it is helpful. Because herbivore have large volume of their stoumach than carnivores and also eat more food |
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| 936. |
The metal which melts when kept on palm |
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Answer» Gallium There are two metals they are gallium and casieum GALLIUM has a temperature 85.6℉ which is enough to melt gallium on our palm.#Hope helpful... a n s w e r\tGallium is a metal that melts when kept on the palm.\tGallium\xa0melts when kept\xa0on\xa0palm because they have a very low\xa0melting point and just the heat in our\xa0palm can melt\xa0them easily. Gallium is\xa0a metal\xa0that\xa0melts when kept\xa0on the\xa0palm. |
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| 937. |
Electric power is inversely proportional to 1.resistance 2.voltage3.current 4.temperature |
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Answer» Electric power is inversely proportional to resistance by the formula P = V^2 / R. Higher the power lower the resistance and lower the power higher the resistance. Consider\xa0P=V2/R\xa0here, Power P is inversely proportional to Resistance R. which implies that-For any constant Potential difference\tWhen power is high, resistance will be low.\tWhen power is low, the resistance will be high. |
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| 938. |
What happens to the resistance of a conductor when temperature is increased |
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Answer» It increases Resistance also because they are proportional to each other by ohm\'s law When the temperature of metallic conductor increases, the velocity of free electrons increases but it also cause increase in amplitude of vibration of metallic atoms which cause some extra resistance in the path of free electron. Hence resistance increases with increase in the temperature. Resistance also increase |
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| 939. |
Which of the following terms does not represent electrical power in a circuit1.I2R2.IR23.VI4.V/R |
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Answer» Electric power in terms of current = IR2 and in terms of voltage = V2/R and in terms of voltage and current both = VI I2R |
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| 940. |
Joule/Columbia is the same as? 1.watt2.volt3.ampher4.ohm |
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Answer» Volt Volt V The other name of unit joule/coulomb is called Volt. 1. Wàtt |
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| 941. |
What is double reaction |
| Answer» Double Displacement Reaction:Reactions in which ions are exchanged between two reactants forming new compounds are called double displacement reactions.AB + CD → AC + BDExample:\xa0When solution of barium chloride reacts with the solution of sodium sulphate, white precipitate of barium sulphate is formed along with sodium chloride.BaCl2\xa0+ Na2SO4\xa0→ BaSO4\xa0+ 2NaCl | |
| 942. |
How to draw electronic dot structure of carbon?? |
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Answer» Side? Follow these simple steps to draw dot structures:\tDraw the atoms on paper and put dots around them to represent valence electrons of the atom. Be sure to have the correct number of electrons.\tIf the species is an ion, add or subtract electrons corresponding to the charge of the ion. Add an electron for every negative (-) charge, and subtract an electrons for every positive (+) charge.\tConsider bonding between atoms by sharing electrons, some may come from one atom.\tIf possible, apply the octet rule to your structure. Some structures don\'t obey the octet rule, but explain why.\tAssign formal charges to atoms in the structure.Let us consider the electron dot structure of carbon tetrachloride, which is a non-metallic halide.\xa0\tCarbon has four electrons in its outermost shell, so it requires four more electrons to complete its octet.\xa0\tChlorine has seven electrons in its outermost shell, so it requires one more electron to complete its octet.\tNow, Carbon shares its four electrons with four chlorine atoms to achieve stable electronic configuration of eight electrons. In the process the four chlorine atoms too acquire the stable electronic configuration. The electron dot structure of Carbon tetrachloride can be drawn as:\xa0 |
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| 943. |
Please explain water of crystallization. |
| Answer» Water of crystallisation is a fixed number of water molecules present in one formula unit of a salt. One formula unit of copper sulphate contains five water molecules (5H20). The water molecules which form part of the structure of a crystal are called water of crystallisation. When hydrated salts are heated strongly, they lose their water of crystallisation.On strong heating, blue copper sulphate crystals turn white (due to the loss of water of crystallisation). | |
| 944. |
Define the oxidation and reduction reaction with example |
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Answer» Oxidation means the gain of oxygen and loss of hydrogen. Reduction means the loss of oxygen and gain of hudrogen A reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.Consider the following redox reaction.\tBurning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.\tC6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l)\t\tReaction of zinc oxide and carbon.ZnO + C --> Zn + COIn this reaction carbon is oxidised to CO and ZnO is reduced to Zn. Oxidation- Reduction reactionA reaction in which one reactant undergoes oxidation whereas the other gets reduced during the course of reaction are termed as oxidation-reduction reactions or redox reactions. Oxidation refers to the loss of electrons or increase in oxidation state by a molecule, atom, or ion. Reduction refers to the gain of electrons or decrease in oxidation state by a molecule, atom, or ion.Consider the following redox reaction.\tBurning sugars, such as glucose (C6H12O6) and the fatty acids in the fats we eat.\tC6H12O6(aq) + 6 O2(g) --> 6 CO2(g) + 6 H2O(l)\t\tReaction of Manganese dioxide with hydrochloric acid involves redox reaction.\tReaction of zinc oxide and carbon.ZnO + C --> Zn + COIn this reaction carbon is oxidised to CO and ZnO is reduced to Zn. |
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| 945. |
The exchange of gas in the lungsTakes place by1.osmosis2.digestion3 peristalsis4 diffusion |
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Answer» Diffusion Diffusion |
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| 946. |
The chemical break down of nutrients that occurs inside the living cells of human is called_______? |
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Answer» Catabolism\xa0is the set of metabolic pathways that breaks down molecules into smaller units that are either oxidized to release energy or used in other anabolic reactions. Catabolism or catabolic reaction. Decomposition reaction in the term of chemistry |
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| 947. |
Pleura are the members surroundings1.heart2.liver3.lungs4.kidnet |
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Answer» The two lungs and their pleural sacs are situated in the thoracic cavity . The pleura is a thin, glistening, slippery serous membrane, inflammation of which is called pleurisy. The pleura lines the thoracic wall and diaphragm, where it is known as the parietal pleura. It is reflected onto the lung, where it is called the visceral pleura.So, option lungs is correct answer. Lungs |
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| 948. |
A flap like cartilage controls movement of air and food is1.glottis2.palate3.epiglottis4.larynx |
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Answer» The\xa0epiglottis\xa0is a leaf-shaped\xa0flap\xa0in the\xa0throat\xa0that prevents\xa0food\xa0from entering the windpipe and the lungs. It stands open during breathing, allowing\xa0air\xa0into the larynx. Epiglottis Epiglottis Epiglottis |
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| 949. |
The oxygen carrying pigment in the blood1.prothrombin2.fibrogen3.hemoglobin4.All of the above |
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Answer» Haemoglobin Haemoglobin Haemoglobin |
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| 950. |
Cluster of air sac in lungs are called________? |
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Answer» Alveoli Alveoli Alveoli |
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