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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.
| 9751. |
If a solution turns blue black on adding iodine,what does it indicate? |
| Answer» presence of starch | |
| 9752. |
I want to understand about physics numerical |
| Answer» | |
| 9753. |
What is the charge on OXYGEN |
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Answer» Charge on oxygen is -2 ..(negative)..... The ionic charge on Oxygen is -2. The charge on oxygen is -2. Negative |
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| 9754. |
What do you mean by bisexual |
| Answer» Bisexual: In some animals like tapeworm, liver fluke, earthworm, leech, etc., the male and female reproductive organs are found in a single individual. Such organisms are called bisexual (hermaphrodite).Examples: (Hibiscus, mustard) when it contains both stamens and carpels. | |
| 9755. |
Chemical formula of gypsm |
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Answer» Gypsum is the crystalline mineral of hydrated calcium sulphate, CaSO4. 2H2O. It occurs in bulk form as alabaster, in fibrous form as satin spar, and as clear colorless crystals of selenite. It is used in making plaster of Paris, plaster and plaster board, and is an important constituent of Portland cement. what is gypsm? Caso4. 2 H2o |
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| 9756. |
Write the uses of Electromagnet |
| Answer» Uses of Electromagnets\tGenerators, motors, and transformers\tElectric buzzers and bells\tHeadphones and loudspeakers\tRelays and valves\tData storage devices like VCRs, tape recorders, hard discs, etc.\tInduction cooker\tMagnetic locks\tMRI machines\tParticle accelerators\tMass spectrometers | |
| 9757. |
How much syllabus we can cover during lockdown |
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Answer» Mostly science ,math ,english All subjects Min half |
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| 9758. |
Determine the direction of conventional current |
| Answer» Positive to negative | |
| 9759. |
What is the focal length of concave mirror of radius 30 cm if it dipped in water |
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Answer» f = R /2 , f= 30 / 2 , f= 15 cm 15cm |
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| 9760. |
Find out the no. Of e that will flow for charge of 4C |
| Answer» One coulomb =6*10^18 electronFour coulomb =4*6*10^18 | |
| 9761. |
What does one mean by exothermic and endothermic reaction?give example |
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Answer» When the heat is released during a reaction it is called exothermic reaction.when the heat is absorbed to take place a reaction it is called endothermic reaction Exothermic refers to release/evolution of heat after reactions take placeEndothermic refers to absorbing/utilising heat for reactions to take placeKindly correct me if i am wrong |
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| 9762. |
What is acid and base |
| Answer» Acids are those substances which dissociate H+ ion when dissolved.in water . WHEREAS Bases are the substances which dissociate OH- ion when disolved in water . | |
| 9763. |
Define ohm\'s law ?? V=IR |
| Answer» According to Ohm’s law, the current (I) flowing through a conductor is directly proportional to the potential difference (V) across its ends, provided its physical conditions remain the same.\xa0V µ IV/I = ConstantV/I = RV = IRwhere R is a constant of proportionality called resistance of the conductor.Resistance is the property of a conductor to resist the flow of charges through it. The S.I. unit of resistance is ohm (Ω).From R = V/I, 1 ohm = 1 volt/ampereThe property of the conduct due to which it opposes the flow of current through it is called as resistance of conductor.The current through a resistor is inversely proportional to its resistance. If the resistance is doubled the current gets halved. A component used to regulate current without changing the voltage source is called variable resistance. In an electric circuit, a device called rheostat is often used to change the resistance in the circuit. A conductor having some appreciable resistance is called a resistor. A component of identical size that offers a higher resistance is a poor conductor. An insulator of the same size offers even higher resistance. | |
| 9764. |
What is slaked lime and how is it formed?? |
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Answer» Abhay Singh thanks its a better answer Slaked lime is calcium hydroxide CaO+H2O react and form Ca[OH]2 Slaked lime is made by combining CaO with water so that the CaO converts to Calcium Hydroxide, Ca(OH)2. ... Lime mortar also combines with atmospheric CO2 to form back into Calcium Carbonate, CaCO3 or limestone. Ok did you understood ..... if you need further help tell me i will help you. ....... Wait giving you detailed answer |
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| 9765. |
What is a balanced chemical equation? Why should chemical equation be balanced |
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Answer» When the L.H.S and R. H. S side of a chemical equation is equal then we can say that it is a balanced equation A balanced equation shows that the no.of atoms of element or compound are equal...to verify 2 law.law of constant proportion A balanced chemical reaction is a reaction in which the mass of all atoms/molecules of an element/compound ar equal on both sides. Chemical equations should be balanced to verify law of constant mass. |
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| 9766. |
C3H8 +O2 = 3Co2 + H2o |
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Answer» C3H8+5O2------>3Co2+4H2o C3H8 + 5O2 ---------> 3CO2 + 4H2O |
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| 9767. |
How chlorophyll work in photosy |
| Answer» Chlorophyll absorbs the sunlight to take process further | |
| 9768. |
What is fossils fuel |
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Answer» Fuel which is formed from dead and decaying matter over a very long span of geological time . It is fuel formed from dead and decaying organismes The fuel which is formed by dead and decay organisms, that is known as fossil fuel The fuel coms from fossils of dead organi Resources |
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| 9769. |
Meaning of versatile |
| Answer» An object having various uses or A person having different characteristic qualities. | |
| 9770. |
The movement of a plant part in response to a gravity is called |
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Answer» Geotropism which comes under chemotropism(movement of a plant part in response to any of the external factors. Geotropism |
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| 9771. |
What are covilent bond |
| Answer» Elements having very high ionisation energies are incapable of transferring electrons and elements having very low electron affinity cannot take up electrons. The atoms of such elements tend to share their electrons with the atoms of other elements or with other atoms of the same element in a way that both the atoms obtain octet configuration in their respective valence shell and thus achieve stability. Such association through sharing of electron pairs among different or same kinds is known as Covalent Bond. | |
| 9772. |
What is dudoneum and ileum |
| Answer» The duodenum is the first part of the small intestine. It is located between the stomach and the middle part of the small intestine, or the jejunum. The food mixed with the acids in the stomach moves into the duodenum. Here, the food gets mixed with bile from the gall bladder and digestive juices from the pancreas. | |
| 9773. |
Define cell respiration |
| Answer» Cellular respiration is a set of metabolic reactions occurring inside the cells to convert biochemical energy obtained from the food into a chemical compound called adenosine triphosphate (ATP).\xa0Metabolism refers to a set of chemical reactions carried out for maintaining the living state of the cells in an organism. These can be divided into two categories:\tCatabolism – the process of breaking molecules to obtain energy.\tAnabolism – the process of synthesizing all compounds required by the cells. | |
| 9774. |
Mje samaj nhi a rha kya question karu |
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Answer» to mat kar Woh question Kar jisse teri phat jaye Then no need to type anything..?... |
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| 9775. |
Give a proper defination of salt. |
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Answer» Thanks to all?? Na+cl- Salt is a product of any chemical reaction between a base and an acid.It contains a cation of base and an anion of an acid. Organic salts are obtained by sea or ocean.Acidic salts it are formed by acid.Basic salts it are formed by bases.When acid and bases react they form salts. Na+cl- |
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| 9776. |
What is starching |
| Answer» Starching your clothes adds crispness and structure, providing body to cotton and linen items. It also creates a higher resistance to wrinkling and soiling. Using starch will also ease ironing. Durable synthetics can be “starched,” but should not be be treated with grocery spray starch. | |
| 9777. |
What is the difference between word equation and chemical equation? Which one is more informative? |
| Answer» A word equation describes a chemical reaction using the names of chemicals only. For instance, the word equation for respiration is:glucose + oxygen => carbon dioxide + waterA formula equation is a visual representation of a reaction using chemical formulas. A chemical formula is an expression that states the number and types of atoms that make up any given molecule using the symbols for the elements and sub-scripted numbers.Chemical equation uses chemical formulae instead of names and is balanced. An example of this would be methane burning in oxygen:CH4 + 2O2 →CO2 + 2H2O | |
| 9778. |
What are gustatory and olfactory receptors |
| Answer» Gustatory receptors are present on the papillae of the tongue and are used for detecting taste. Olfactory receptors are present on the olfactory epithelium of the nasal cavity. These are used in the detection of various smells. Sensory signals are sent by these receptors to the brain by sensory nerves. | |
| 9779. |
What do you mean by translocation |
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Answer» Translocation is the process of transportation of soluble food prepared during photosynthesis from leaves to other parts of plants . Translocation is a biological process that occurs in all plants and involves the movement of water and other soluble nutrients through the xylem and phloem from one part of the plant to another. |
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| 9780. |
State the difference in colour of sun during sunrise/sunset and noon. Give explanation for each |
| Answer» During sunrise/sunset it appears red as light has to travel a long distance from the sun through the atmosphere to reach the eye of the observer. Red light is scattered least due to its long wavelength than blue light hence it appears red to the observer. But at noon it appears white as the sun is directly over our head and light rays have to travel short distances without much scattering of any particular the colour of light. Hence it appears white. | |
| 9781. |
I just wanted to ask what are the changes occur in CBSE 2020-21 |
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Answer» All students can do self study at home I don\'t think so that any change in cbse 2020-21 All the chapter are complesary but i think paper has been late and any update are got by government. |
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| 9782. |
Process of food making in plants |
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Answer» Simple photosynthesis Photosynthesis.. Yes photosynthesis Photosynthesis They(plants) use sunlight , water and minerals from soil, carbon dioxide and clorophyll to prepare food and release oxygen Photosynthesis |
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| 9783. |
What do u mean by rickets |
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Answer» Ggh A deficiency disease that affects the young during the period of skeletal growth, is characterized especially by soft and deformed bones, and is caused by failure to assimilate and use calcium and phosphorus normally due to inadequate sunlight or vitamin D. Lack of vitamin D results in reduced absorption of calcium and phosphorus. Difficulty maintaining proper calcium and phosphorus levels in bones can cause rickets(disease). It\'s a disease due to the lack of vitamin D |
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| 9784. |
State why concave lens diverges the ray of parallel beam of light |
| Answer» How much syllabus of physics u have completed | |
| 9785. |
What is plant nutrition |
| Answer» Plant nutrition is the study of the chemical elements and compounds necessary for plant growth, plant metabolism and their external supply. In its absence the plant is unable to complete a normal life cycle, or that the element is part of some essential plant constituent or metabolite. | |
| 9786. |
Water helps in separation of oppositely charged ions from their ionic compound give reason |
| Answer» Because it contains ions in water which moves to the opposite electrodes when electricity is passed through the solution. this is possible in molten state since the electrostatic forces of attraction between the oppositely charged ions are overcome due to the heat. | |
| 9787. |
What happens when blue crystals of coppersulphate is heated ? |
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Answer» It first loses 5 H20 and then this reaction takes place :- CuSo4 -> CuO+So2+So3+O2 and change of blue color solution. The heat causes blue copper sulphate (also known as hydrated copper sulphate) to decompose forming anhydrous copper sulphate and water. Anhydrous copper sulphate formed is white in colour. Answer:The compound which is blue earlier turns into a colourless solid. |
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| 9788. |
Principles of metallurgy |
| Answer» Principles of Metallurgy:The metallurgical process can be classified as the following:1. Crushing and grinding: The first process in metallurgy is crushing of ores into a fine powder in a crusher or ball mill. This process is known as pulverization.2. The concentration of ores: The process of removing impurities from ore is known as a concentration of minerals or ore dressing. In metallurgy, we concentrate the ores mainly by the following methods.3. Hydrolytic method: In this method, we pour the ore over a sloping, vibrating corrugated table with grooves. A jet of water is allowed to flow over the surface. The denser ore particles settle in the grooves, and the impurities are washed away by water.4. Magnetic separation: In this case, the crushed ore is placed on a conveyor belt. This belt rotates around two wheels in which one of the wheels is magnetic, and therefore the magnetic particles get attracted to the magnetic wheel and fall apart from the non-magnetic particles.5. Froth floatation: In this process, we take the crushed ore in a large tank which contains oil and water. A current of compressed air is passed through it. The ore gets wet by oil and is separated from the impurities in the form of froth. Ore is lighter, and so it comes on the surface and impurities are left behind. | |
| 9789. |
Explain the mechanism of breathing in human beings? |
| Answer» The process of taking air into and expelling it from the lungs is called breathing.The action of breathing in and out is due to changes of pressure within the thorax, in comparison with the outside. This action is also known as external respiration. When we inhale the intercostal muscles (between the ribs) and diaphragm contract to expand the chest cavity. The diaphragm flattens and moves downwards and the intercostal muscles move the rib cage upwards and out.This increase in size decreases the internal air pressure and so air from the outside (at a now higher pressure that inside the thorax) rushes into the lungs to equalise the pressures.When we exhale the diaphragm and intercostal muscles relax and return to their resting positions. This reduces the size of the thoracic cavity, thereby increasing the pressure and forcing air out of the lungs. | |
| 9790. |
What are enzyme |
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Answer» Engymes are bio catalist Enzymes are soluble protein molecules that can speed up chemical reactions in cells. These reactions include respiration, photosynthesis and making new proteins. For this reason enzymes are sometimes called biological catalysts. Oxidation:\xa0A chemical reaction which involves\xa0addition of oxygen or removal of\xa0hydrogen or loss of electron(s)\xa0is\xa0called as oxidation.2Mg + O2 →2MgO (addition of oxygen)H2S + Br2 → 2HBr + S (removal of hydrogen)Fe2+ → Fe3+ + e- (loss of electron) |
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| 9791. |
S chand book physics solution |
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Answer» You should go to play/app Store and download the app of solutions. Serch it on google not here Play store pe search kro vha app h usse download krr lo..... ?????????????????????search on google, not here. ?? |
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| 9792. |
Explain the process of nutrition in amoeba? |
| Answer» Amoeba takes in food using temporary finger like extension of the cell surface which fuse over the food particles forming a food vacuole | |
| 9793. |
Which of the following is a conductor metal make a metal metal quads metal double metal quotes |
| Answer» | |
| 9794. |
What is limitations of mendelev\'s periodic table?? |
| Answer» Limitations of Mendeléev’s classification\tNo fixed position could be assigned to hydrogen in the Periodic Table.\tIsotopes discovered long after Mendeléev periodic classification of\telements imparted a challenge to Mendeleev’s Periodic Law.\tThe atomic masses of elements did not increase in a steady manner while going from one element to other which made it difficult to predict the number of elements that could be discovered between two elements. | |
| 9795. |
Why should balance a skeletal chemical equation |
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Answer» According to the law of conservation of mass, mass can\'t be created nor be destroyed means the total mass of the reactant is equal to the total mass of product and to verify or to follow this law we balances a skeletal chemical equation. To follow law of conservation of mass It is the unbalanced chemical equations where the mass is not same on both side of equations Skeletal chemical equation should be balanced to follow the law of conservation of mass |
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| 9796. |
The rate of chemical reaction increases on increasing the surface area of reactants ,why? |
| Answer» Reactant\xa0concentration, the physical state of the reactants, and surface area,\xa0temperature, and the presence of a\xa0catalyst\xa0are the four main factors that affect reaction rate.\xa0Reaction rates\xa0can be affected by several factors, including\xa0concentration, temperature,\xa0surface area\xa0and presence of a catalyst. Increasing\xa0concentration\xa0increases the number of effective collisions.\xa0Increasing the surface area\xa0of a solid\xa0reactant\xa0exposes more of its particles to attack. This results in an\xa0increased\xa0chance of collisions between\xa0reactant\xa0particles, so there are more collisions in any given time and\xa0the rate\xa0of\xa0reaction increases. | |
| 9797. |
Which receptors are present in our sense organ. |
| Answer» Sensory receptors | |
| 9798. |
What is meaning of host |
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Answer» The organism from whose body food is obtained Host : the organisms on which parasites live and gain food. Thereby affecting the health of the host. HOST are nothing who live on living organisms for food. Such as lies in human head and also parasites The person who is the head in some things. |
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| 9799. |
Where is dumbell shaped stomata presrny |
| Answer» When the guard cells lose water, they shrink and the stomata will close. Guard cells also have large vacuoles. The cells that surround the guard cells are known as subsidiary or accessory cells. The guard cells in dicot plants are kidney shaped and dumbbell shaped in monocots. | |
| 9800. |
What is photosynthetic nutrition? |
| Answer» It a a mode of nutrition followed by plants as they are autotrophic so they prepare food themselves. | |