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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.
| 2551. |
What happen when dilute hydrochloric acid is added to iron filling? |
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Answer» When dilute Hydrochloric acid is added to iron filings, iron chloride & hydrogen gas is produced. The iron displaces hydrogen from hydrochloric acid to form iron (II) chloride & hydrogen gas. Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas:\xa0Fe(s) + 2 HCl(aq) → FeCl 2 (aq) + H 2 (g) The H 2 gas from the reaction of 2.2 g of iron with excess acid is collected in a 10.0-L flask at 25 °C. When dilute Hydrochloric acid is added to iron filings, iron chloride & hydrogen gas is produced. The iron displaces hydrogen from hydrochloric acid to form iron (II) chloride & hydrogen gas. Iron reacts with hydrochloric acid to produce iron(II) chloride and hydrogen gas:Fe(s) + 2 HCl(aq) → FeCl 2 (aq) + H 2 (g) The H 2 gas from the reaction of 2.2 g of iron with excess acid is collected in a 10.0-L flask at 25 °C. |
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| 2552. |
What is balanced chemical equation ? Why should chemical equation balanced |
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Answer» The no. Of atoms of each element is equal on reactant side and product side,is cakled balanced chemical equation. Chemical equation should be balanced because only a balanced equation can tells us the relative quantity of different reactants and product involved in it,example:Zn+H2SO4-ZNSO4+H2. A balanced chemical equation has an equal number of atoms of different elements in the reactants and products. It has equal masses of various elements in the reactants and products.Example: Zn + H2SO4 - ZnSO4 + H2\xa0\tBalancing the Chemical Equations:\tIn a balanced chemical equation, the total number of atoms of each element of the reactants on the left hand side of the equation is equal to the number of atoms of the products formed on the right hand side of the equation.\tThe total mass of the reactants is equal to the total mass of the products or the number of atoms of each element before the reaction and after the reaction is equal. |
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| 2553. |
Give an example of double displacement reaction |
| Answer» Those reactions in which two compounds react by an exchange of ions to form two new compounds are called double displacement reactions.Example: AgNO3 (aq) + NaCl (aq) -\xa0AgCl (s)+ NaNO3 (aq)When silver nitrate solution is added to sodium chloride solution, then a white precipitate of silver chloride is formed alongwith sodium nitrate solution. In this reaction, two compounds, silver nitrate and sodium chloride, react to form two new compounds,, silver chloride and sodium nitrate. | |
| 2554. |
What is sextual reproduction ? |
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Answer» Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another to produce an organism composed of cells with two sets of chromosomes.\xa0Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. Sexual reproduction does not occur in prokaryotes (organisms without cell nuclei), but they have processes with similar effects such as bacterial conjugation, transformation and transduction, which may have been precursors to sexual reproduction in early eukaryotes. Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete with a single set of chromosomes combines with another to produce an organism composed of cells with two sets of chromosomes.\xa0Sexual reproduction is the most common life cycle in multicellular eukaryotes, such as animals, fungi and plants. Sexual reproduction does not occur in prokaryotes (organisms without cell nuclei), but they have processes with similar effects such as bacterial conjugation, transformation and transduction, which may have been precursors to sexual reproduction in early eukaryotes. |
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| 2555. |
What is sucrose? |
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Answer» Sucrose provide your body with the energy required to perform physical and mental function. Your body break down food such a sucrose and starch into fructose and glucose during digestion .the fructose and glucose are metabolized to your body to release energy to your cell ??? Sucrose is the sugar which is known as table sugar. Sucrose is found in all photosynthetic plants. It is commercially obtained from sugarcane and sugar beets via an industrial process. The molecular formula of sucrose is C12H22O11. Sucrose comprises α form of glucose and β form of fructose. It is formed by condensation the reducing carbon atoms of glucose (C1 – α) and fructose (C2 -β). The glycosidic in a sucrose molecule linkage is 1α-2β linkage. On hydrolysis by acids or invertase enzyme, sucrose gives one molecule each of D-Glucose and D-Fructose. Sucrose is dextrorotatory, with a specific rotation of +66.5%, D-glucose has a positive specific rotation of, [α]D = +53°, while D-fructose has negative rotation of [α]D = -92°. The hydrolyzed mixer has an equal concentration of glucose and fructose with negative rotation. Hence the mixture is called invert sugar.\tSucrose is combined at the hemiacetal oxygen and does not have a free hemiacetal hydroxide.\tSucrose is a non-reducing sugar.\tDoes not show mutarotation (α to β conversion).\tSucrose also does not form osazones for the same reason. |
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| 2556. |
Why is magnesium sulphate dipped |
| Answer» Magnesium sulfate\xa0as a medication is used to treat and prevent low blood\xa0magnesium\xa0and seizures in women with eclampsia. It is also used in the treatment of torsades de pointes, severe asthma exacerbations, constipation, and barium poisoning. It is given by injection into a vein or muscle as well as by mouth.\xa0Magnesium sulfate\xa0injection is a naturally occurring mineral\xa0used\xa0to control low blood levels of\xa0magnesium.\xa0Magnesium sulfate\xa0injection is also\xa0used\xa0for pediatric acute nephritis and to prevent seizures in severe pre-eclampsia, eclampsia, or toxemia of pregnancy. | |
| 2557. |
Basic solution contain ____ ions |
| Answer» H+ ions | |
| 2558. |
What is the percentage of water on earth |
| Answer» The persentage of water on earth is 71% and almost of it 96.5% is salt water........ | |
| 2559. |
What is lungs |
| Answer» The lungs are the primary organs of the respiratory system in humans and many other animals including a few fish and some snails. | |
| 2560. |
Potential different between a live wire and nutrial wire |
| Answer» Potential difference between live wire and neutral wire is 220V. An electric fuse is placed in the path of the phase wire before it is connected to the electric meter. | |
| 2561. |
How we know about the substance is metal when it\'s atomic number is stable |
| Answer» | |
| 2562. |
Why ions are formed |
| Answer» ions are formed when atoms lose or gain electrons in order to fulfill octet rule and have full valence electrons shell. When the losses there electrons they become positively charged and name cation. When the gain electrons they are negatively charged and become anions. | |
| 2563. |
Why do plants need to ensure that there is sufficient intake of oxygen |
| Answer» Oxygen, for\xa0plants, is essential because\xa0it\xa0makes the process of respiration more efficient (known as aerobic respiration).\xa0Plant\xa0cells\xa0are\xa0respiring constantly. But, during times when they can\'t access light, most\xa0plants\xa0respire more than they photosynthesize, so they take in more\xa0oxygen\xa0than they produce.\xa0Respiration\xa0is the\xa0process of oxidation of food substances that release carbon dioxide; it takes place throughout\xa0the day.\xa0Photosynthesis takes place\xa0during day in\xa0presence of Sunlight only. Hence,\xa0plants\xa0release\xa0oxygen during day\xa0only\xa0while\xa0carbon dioxide\xa0is\xa0released\xa0during\xa0night.\xa0 | |
| 2564. |
In human body which part are not burn? |
| Answer» Nails | |
| 2565. |
Define inspiration and expiration. |
| Answer» \tInspiration and expiration are two processes involved in respiration. Inspiration is the process of taking in of the air and expiration is the breathing out of the air.\xa0\tDuring inspiration, there is an increase in the volume of the thoracic area. The diaphragm becomes flattened\xa0and there is the relaxation of the intercostal muscles. This allows the increase in the thoracic cavity and allows the lungs to expand and take the air inside.\xa0\tDuring expiration, there is a decrease in the volume of the thoracic cavity due to diaphragm being dome-shaped and contraction of the intercostal muscles. This allows the lungs to push the air outside. | |
| 2566. |
What is epiglottis ? |
| Answer» At the top of the trachea (or wind pipe) there is a flap of cartilage called epiglottis. The function of epiglottis is to cover the mouth of trachea (or wind pipe) when we swallow food so that the food may not enter the trachea (or wind pipe). | |
| 2567. |
State the product of respiration in human muscles? |
| Answer» Anaerobic respiration takes place in human muscles during vigorous physical exercise because oxygen gets used up faster in the muscle cells than can be supplied by the blood.\xa0The end-products of anaerobic respiration in muscles of human beings is lactic acid and in yeast cells, ethanol and carbon dioxide are released. Carbon dioxide and water are released during aerobic respiration. Large amount of energy is released in aerobic respiration as compared to anaerobic respiration. | |
| 2568. |
Discovery of electricity |
| Answer» Benjamin franklin | |
| 2569. |
Why should a magnesium ribbon cleaned before burning in air |
| Answer» Magnesium ribbon Need to be cleaned before burning in the air because magnesium metal reacts with oxygen and forms magnesium oxide and to prevent this layer of magnesium oxide magnesium ribbon needs to be cleaned before burning in the air | |
| 2570. |
Define the terms :incident ray, reflected ray and normal ray |
| Answer» \tIncident ray: A ray of light from a source that falls on the surface is called an incident ray of light.\tReflected ray: The ray of light that bounces back from the surface of an object is called a reflected ray of light.\tNormal at point of incidence: A line drawn perpendicular on the surface (i.e. making 90° angle with the surface) of an object at the point of incidence is called a normal point of incidence. | |
| 2571. |
How solar energy works? |
| Answer» \tSun\'s heat which falls on the earth can be harnessed for various heating and lighting purposes.\tMost of the sun\'s heat is absorbed is the atmosphere.\tOnly a very small portion reaches the earth and it is this energy that can be harnessed for energy purposes.\tA black surface absorbs more heat than a white surface.\tThis property is used in Solar cookers, Solar water heaters and Solar cells. | |
| 2572. |
Role of bile juice |
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Answer» it helps to break large fat globule into smaller one. this process is known as emulsification of fats Bile helps to emulsify fats (increasing surface area to help enzyme action), and thus aids in their absorption in the small intestine. It also makes the acidic food coming from the stomach alkaline, so as to enable the action of pancreatic enzymes. |
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| 2573. |
By what other name is the unit joule/coulomb called |
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Answer» Voltage Volt |
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| 2574. |
Which is the most reactive metal in the world |
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Answer» Cesium Cesium Potassium Francium |
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| 2575. |
The compound obtained on reaction of iron with steam is/are: |
| Answer» When a metal reacts with steam then the products formed are metal oxide and hydrogen gas.Metal + steam → Metal oxide + HydrogenWhen red hot iron reacts with steam to form iron(II,III) oxide and hydrogen.3Fe(s) + 4H2O(g) steam → Fe3O4 (s) + 4H2(g)\xa0 | |
| 2576. |
Define electricity and current electricity |
| Answer» Electric current: The flow of electric charges across a cross-section of a conductor constitutes an electric current. It is defined as the rate of flow of the electric charge through any section of a conductor. Electric currentharge/Time or I = Q/t Electric current is a scalar quantity. | |
| 2577. |
How do we decide that some thing is alive? |
| Answer» By breathing and movement in body | |
| 2578. |
Expain Transpiration |
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Answer» Thankyou both of them for answer Plants gets cool down by evaporating water from their body is called transpiration process in which plants get evaporated from the leaves is known as transpiration |
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| 2579. |
Definition of homologous series . |
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Answer» Homologous Series\tA series of carbon compounds in which same functional group substitutes the hydrogen atom is called a homologous series.\tThese compounds have similar chemical properties due to the addition of same kind of functional group throughout the chain.\tFor example, the series of alkanes i.e. Methane, ethane, propane, butane and so on is a homologous series. It is a sequance of compounds with same functional group and similar chemical properties. ?? |
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| 2580. |
What flame colour did you observe when the metal burnt ? |
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Answer» No Anushka its not red Red It depends on type of metal under observation,every metal has its own characterstics flame colour depending on its characteristics wavelength, for example Na metal has yellow and potassium shows violet colour= If my answer is remember to you so please reply and like |
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| 2581. |
DESCRIBE DOUBLE CIRCULATION OF BLOOD IN HUMAN BEINGS. |
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Answer» If you know about it then why asking to others These three components work to paases blood through the heart twice per circuit. The right pump sends deoxygenerated blood to lungs where it becomes oxy genated and return back to heart = This method is called double circulation of blood Double circulation is passage of the same blood through the heart once on right side and then on the left side in order to complete one cycle.?????? ??????????? ??? ??? ??????????:-1. ????????? ???????????:- It is movement of blood from heart to the lungs and back. Deoxygenated blood of the body enters the right auricle, passes into right ventricle which pumps it into pulmonary arch. With the help of two separate pulmonary arteries the blood passes into the lungs. Here, it is oxygenated. Oxygenated blood comes back to left auricle of heart through four pulmonary veins, two from each lungs.2. ???????? ??????????? :- It is the circilation of the blood between heart and different parts of the body except lungs. Oxygenated blood receive by left auricle passes into left ventricle. The left ventricle pumps it into aorta for supply into different body parts including walls of the heart by means of arteries. The human ciculatory system has three key components:blood vessels , blood and heart |
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| 2582. |
Who discovered modern periodic table? |
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Answer» Neil borh Damitri Mendeleev |
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| 2583. |
What is raonbow formation in sky |
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Answer» A rainbow is a meteorogical phenomenon that is caused by reflection, refraction and dispersion of light in water droplet resulting in a sepctrum of light appearing in the sky it take in the form of multicolour carculer arc. Rainbow caused by sunlight always apper in the section of sky directly opposite to the sun By sun and water explanation is given in text book |
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| 2584. |
2hat is rainbow formation of sky |
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Answer» \tA rainbow is a natural spectrum of sunlight in the form of bows appearing in the sky when the sun shines on rain drops.\tIt is combined result of reflection, refraction and dispersion of sunlight from water droplets, in atmosphere.\tAlways it formed in the direction opposite to the sun.\tTo see a rainbow, the sun must behind us and the water droplets falls infront of us.\tWhen a sunlight enters into a spherical rain¬drop, it is refracted and dispersed. The different colours of light bent in different angles.\tWhen different colours of light fall on the back inner surface of drop, it (water drop) reflects (different colours of light) internally (total internal reflection).\tThe water drops again refracts the different colours, when it comes out from the raindrop.\tAfter leaving this different colours from the raindrop as rainbow, reach our eye. Thus, we see a rainbow. Type correctly okkkk |
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| 2585. |
What is the role of HCL and mucus in stomach? |
| Answer» HCL makes the food acidic.Mucus protect the inner lining part of the stomach from the HCL. | |
| 2586. |
Which gland is known as master galand? |
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Answer» What is it structure? Pituitary gland Pitiutary gland |
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| 2587. |
Which is the male *** cell |
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Answer» Sperm Sperm |
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| 2588. |
how to produce electricity free |
| Answer» This concept of\xa0free\xa0energy\xa0can\xa0be made using magnets or simple motors. The technology of magnets and motors used in generation of power has been around us ever since\xa0we\xa0started\xa0generating electricity\xa0using conventional sources of energy. The simplest generator consists of just a coil of wire and a bar\xa0magnet. When you push the\xa0magnet\xa0through the middle of the coil, an electric current is produced in the wire. The current flows in one direction as the\xa0magnet\xa0is pushed in, and in the other direction as the\xa0magnet\xa0is removed. | |
| 2589. |
Properties of ionic compounds |
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Answer» Properties of ionic compounds are as follows.\tIonic compounds are solids and hard due to the strong attracting force between the positive and negative ions. These compounds are generally brittle and break into pieces on application of pressure.\tIonic compounds have high melting and boiling points because a application of significant amount of energy can break the strong inter-ionic attraction.\tIonic compounds are soluble in water but insoluble in solvents like kerosene, petrol, etc.\tConduction of electricity through a solution is possible when there is movement of charged particles. Ionic compounds in the solid state do not conduct electricity because movement of ions in the solid is not possible due to their rigid structure.\tA solution of an ionic compound in water contains ions, which move to the opposite electrodes when electricity is passed through the solution. Ionic compounds conduct electricity in the molten state as in the molten state the electrostatic forces of attraction between the oppositely charged ions overcome due to the heat. Thus, the ions move freely and conduct electricity. Ionic compounds are stronger which means that they doesn\'t break easily. Solution of ionic compounds are a good conductor of electricity. |
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| 2590. |
Why light falls into different colours by prism |
| Answer» A light ray is refracted (bent) when it passes from one medium to another at an angle and its speed changes. At the interface, it is bent in one direction if the material it enters is denser (when light slows down) and in the other direction if the material is less dense (when light speeds up). Because different wavelengths (colors) of light travel through a medium at different speeds, the amount of bending is different for different wavelengths. Violet is bent the most and red the least because violet light has a shorter wavelength, and short wavelengths travel more slowly through a medium than longer ones do. Because white light is made up of all visible wavelengths, its colors can be separated (dispersed) by this difference in behavior.\xa0 | |
| 2591. |
How is science is helpful in our daily life?? |
| Answer» In our daily life, science is useful as below.\tThe food you eat.(grown in farms, where fertilizers and pesticides are used, with farm equipments and transported to where you are)\tThe cloths you wear.(made of synthetic or natural fibers, colored, made in factories)\tThe house you stay in.(made of concrete, which is made of cement)\tThe transport you use for moving around (bicycle, motorbike, car, bus, train, ship, airplane etc)\tThe medicine you take when you are sick.\tThe fire you use for cooking ( started by a match stick and sustained by petroleum based fuel).\tEntertainments you enjoy(movies, music, TV aka technology)\tElectricity.\tDifferent materials you use in your daily life(metal, wood, plastic you name it, to reach you in its current form, each went through many manufacturing processes.)\tInternet facilities | |
| 2592. |
What is chemicsl energy ? |
| Answer» Chemical energy\xa0is\xa0energy\xa0stored in the bonds of\xa0chemical\xa0compounds, like atoms and molecules. This\xa0energy\xa0is released when a\xa0chemical\xa0reaction takes place. Usually, once\xa0chemical energy\xa0has been released from a substance, that substance is transformed into a completely new substance.\xa0Examples of matter containing\xa0chemical energy\xa0include: Coal: Combustion reaction converts\xa0chemical energy\xa0into light and heat. Wood: Combustion reaction converts\xa0chemical energy\xa0into light and heat. Petroleum: Can be burned to release light and heat or changed into another form of\xa0chemical energy, such as gasoline. | |
| 2593. |
How can i easily remember chemical equation |
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Answer» Practice make man perfect?✨ Practise & practise or revise Practice and faith |
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| 2594. |
i am having. douth in writing. equation |
| Answer» Better you learn the valency of the electrons | |
| 2595. |
How can we understand that chemical equations and reactions? |
| Answer» Chemical reactions are the processes in which new substances with new properties are formed. Example - When magnesium ribbon is heated, it burns in air to form a white powder called magnesium oxide.2Mg + O2\xa02MgODuring a chemical reaction, atoms of one element do not change into those of another element. Only a rearrangement of atoms takes place in a chemical reaction. In a chemical reaction, reactants are transformed into products. The substances which take place in a chemical reaction are called reactants. The new substances produced as a result of chemical reaction are called products.\xa0The method of representing a chemical reaction with the help of symbols and formulae of substances involved in it is called a chemical equation.Example: Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn + H2SO4\xa0ZnSO4 + H2 | |
| 2596. |
Why salts are classify into different families |
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Answer» Salts are formed by the reaction of acids and base. And a salt contains positive and negative radicals both. On the basis of positive and negative radicals, salts can be categorized into family.If two salts have same positive or negative radicals, they are called to be of same family.In other words, if salts formed by the reaction of same acid with different bases, then all salts so formed belong to the same family. On the other hand if salts formed by the reaction same base with different acids, then all salts so formed have same negative radicals, and all such salts are called to be belonged to the same family.Example:In Sodium chloride and sodium sulphate, sodium which is positive radical is same in both of the salts. Thus, sodium chloride and sodium sulphate belongs to the sodium family.Similarly, in sodium chloride and potassium chloride, chloride which is negative radical is same. Thus, sodium chloride and potassium chloride both belong to chloride family. Because different salt use in different ways |
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| 2597. |
Which hormone secreted from the interior pituitary helps in secondary sexual character in males? |
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Answer» FSH and LH No Testosterone. Testrostone |
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| 2598. |
How is the process of pollination Different from fertilisation? |
| Answer» Pollination take place in plants whereas fertilisation take place in humansPollination is the process by which plants transfer their pollen grain from anther to stigma and fertilisation is the process in which male gamate and female gamate fuse together to form zygote | |
| 2599. |
What is mean by precipitation reaction? Explain by the examples. |
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Answer» When two reactant in solution react and one or more of the product in soluble or form the precipitate reaction for example:when a solution of iron chloride and ammonium hydrogen is mixed a brown precipitate of iron hydrogen are formed The reaction between silver nitrate (AgNO3) and sodium chloride (NaCl), results in the formation of silver chloride (AgCl) that is an insoluble salt. The reaction in which a solid ( precipitate) compound is formed as by product. |
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| 2600. |
Why do we apply paint on iron article? |
| Answer» To protect it from rusting | |