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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.
| 49851. |
What is lattest paper style of class x for boadd exam 2020? |
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Answer» On this app or at www.cbse.nic.com See the sample papers |
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| 49852. |
What are universal indicators |
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Answer» It is a special type of indicatoer which not only detect that the given substance is acid or base it also detect that it is strong acid, strong base , weak acid or weak base . ph is universal indicator. Universal indicator is a pH indicator that transitions through numbers 3-12 (on the pH chart) to indicate the acidity or alkalinity of solutions.\xa0Details:\tpH value: Approximately 7A universal indicator is typically composed of water, methanol, propan-1-ol, phenolphthalein sodium salt, methyl red sodium salt, bromothymol blue monosodium salt, and thymol blue monosodium salt . |
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| 49853. |
The Number of covalent bond present in pentane |
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Answer» 16 16 16 16 The ans is 16 16.. |
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| 49854. |
Is it important to study science from ncert line to line ?????? |
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Answer» But in board exam the questions will be not given which questions which are in ncert question.it is only benificial for low student but in competitive exam you must be stusy in the best extra books. U can do some imp points for the topoc. It may or may not. They can even form questions from lines Is it not possible to clear topic from s chand and study ncert question???? Yes because in board exam questions are based on only ncert |
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| 49855. |
What is genotype and phenotype ratio of monohybride and di-hybride cross |
| Answer» आइये उदाहरण के द्वारा जानते हैं: - Tt, Tt, Tt, tt; यहाँ T dominant है और t recessive तब इसका जीनोटाइपिक ratio1: 2 है: और इसका फेनोटाइपिक ratio 3: 1 है इसी तरह डी-हाइब्रिड क्रॉस में है। | |
| 49856. |
Can anyone tell me the formula of pyruvic acid? |
| Answer» C3H6O3 | |
| 49857. |
Difference between the acquired traits and inherited traits |
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Answer» Formula of lactic acid Acquired traits -*Do not bring changes .*Cannot undergo direct evolution.*Cannot be passed on to the progeny.Inherited traits-*Bring changes.*Can undergo direct evolution.*Can be passed on to the progeny. Inherited traits are those traits which we get from our parents but in acquired traits which we gain ourselves. |
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| 49858. |
Difference between excretion and egestion |
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Answer» Excretion is the removal of liquid waste from our body while egestion is the removal of solid waste from our bodies. digeste food remove by the west form through the body |
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| 49859. |
What happened when eggs shells are dissolved in nitric acid? |
| Answer» Answer : Since egg shell is made of calcium carbonate. And we know that when calcium carbonate (CaCO3) reacts with nitric acid (HNO3) then carbon dioxide, calcium nitrate and water are formed. So same reaction happens when nitric acid is added to an eggshell. | |
| 49860. |
Law of Cartesian |
| Answer» Cartesian Sign Convention:\xa0In the case of spherical mirror all signs are taken from Pole of the spherical mirror, which is often called origin or origin point. This sign convention is known as New Cartesian Sign Convention.Sign is taken as – (negative) from pole of a spherical mirror towards object along the principal axis. This means sign is always taken as – (negative) in front of a spherical mirror. For example; the distance of object is always taken as – (negative) in case of both types of spherical mirror, i.e. concave and convex mirrors.\tSign is taken as + (positive) behind the spherical mirror. For example if an image is formed behind the mirror, the distance of image is taken as + (positive) from pole along the principal axis.\tThe height of is taken as + (positive) above the principal axis and taken as – (negative) below the principal axis. | |
| 49861. |
What colour does the sky appear to an astronaut and why |
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Answer» Sky appear black to the astronaut because there were not any outer atomsphere to diperse light and light enter into their eye without any dispersion. The sky appears black to astronauts because their is no atmosphere to refrect blue color The sky color appears to the astronauts is black. because original color of the sky is black due to the scattering of blue color in the sky. we have seen the blue color sky. |
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| 49862. |
Silver articles becomes black on prolonged exposure to air. This is due to the formation og? |
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Answer» As we know that silver is the most unreactive metal but on the prolonged exposure it react with hydrogen sulphide and form silver sulphide and become black.That form a layer on silver article that\'s also prevent silver article from fruther corrosion Silver sulphide... Silver article become black because silver reacts with H2s gas present in air to form black coating of Ag2SWhen the silver react with the hydrogen sulfide gas that is present in the air to form a black coating of silver sulfide. Silver sulfide are insoluble in all the solvents.The balanced chemical reaction will be,{tex}2Ag(s)+H_2S(g)\\rightarrow Ag_2S(s)+H_2(g){/tex}By the stoichiometry, 2 moles of silver react with the 1 mole of hydrogen gas to give 1 mole of silver sulfide and 2 moles of hydrogen gas.\xa0 |
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| 49863. |
Why light passing through c.c revert back? |
| Answer» Centre of curvature of a concave mirror retraces its path (gets reflected along the same path), because as the ray of light passes through centre of curvature of a concave mirror it strikes the mirror along the normal i.e. it incidences on to the mirror at 90 degree. Hence the incident ray coincides with the normal. Therefore angle of incidence = 0 so, as we know according to law of reflectionangle of reflection = 0, hence the angle of reflection too become zero degree, thus ray of light retraces its path. | |
| 49864. |
The use of vaseline in the experiment to show that CO2 is given out during respiration, is to? |
| Answer» To block the air flow from different places.. | |
| 49865. |
What is graphina |
| Answer» | |
| 49866. |
What is permananent magnet? |
| Answer» These types of magnets can retain their magnetism and magnetic properties for a longer time. Strongly magnetized hard materials make up permanent magnets. A perfect example of a permanent magnet is the\xa0Bar Magnet. This magnet widely explains the behavior of magnets. Actually, we call permanent magnets as Bar Magnets\xa0also. | |
| 49867. |
Name 4 stake holders |
| Answer» 1)..local tribals or villagers who r living nearby forests 2)...the forest department 3)..the industrialists 4)..and the wildlife and most of the people in world..... | |
| 49868. |
ch. 2 all activity with solution |
| Answer» | |
| 49869. |
How make soap in india |
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Answer» L k G and UKG full form Animal fat or vegetable oil act as glyceride or glyceryl ester. And sodium hydroxide and potassium hydroxide act as bases.Take about 30 ml of vegetable oil in a beaker. Then add 60 ml of 20% sodium hydroxide solution to it.This mixture is heated slowly till it boils. After the mixture has boiled for five to ten minutes add 5grams of sodium chloride in order to separate soap from the solution. Allow the solution to cool. The creamy layer floating on top of the solution is the soap. Thus soap is prepared by hydrolysing fat or oil with bases such as sodium hydroxide or potassium hydroxide. This process of soap preparation is known as saponification Caustic sod |
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| 49870. |
What\'s alkine |
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Answer» Water soluable bases known as the alkaline Alkaline means basic character or bases. |
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| 49871. |
What\'s 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 the series in which compounds have same chemical properties and same structure but differ by one carbon and two hydrogen |
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| 49872. |
What\'s alkalis? |
| Answer» Water soluble bases are called alkalis | |
| 49873. |
What are the causes of overloading |
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Answer» When too many appliances for heavy appliances are connected to a single socket Three factors which can cause overloading are(i) When the live wire and the neutral wire come into direct contact.(ii) Accidental hike in the supply voltage.(iii) By connecting too many appliances to a single socket. |
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| 49874. |
What is the cromozon |
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Answer» Chromosome are the thread like structures which contains information of our heridetary genes A chromosome is an organized structure of DNA and protein found in the nucleus of cells. It is a single piece of coiled DNA containing many genes. These are considered to be the vehicles of heredity as they carry genes. Genes are small points on the chromosome responsible for one character of an individual. It is a thread like structur inside the cell Chromosome is a thread like structure in the nucleus of a cell formed of DNA which carries the genes... |
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| 49875. |
Formula of resistivity |
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Answer» Rho= Resistance.Area/Length Resistivity or specific resistance is resistance of a conducting material of unit length and having unit area of cross section. It is a property of material and depends on nature of material.SI unit is Ohm-m (Ω.m) Resistivity = Resistance× length/area.. |
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| 49876. |
Why are metal reducing agent where as non metal are oxidising agent |
| Answer» Because metals are electro positive means thy are electron dinners. Non metals are electro negative measurement thy are electron Esepters. | |
| 49877. |
Draw the isomers of butane , C4H10. |
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Answer» Ch3-ch-ch3-ch3 Its ok @ashish raushan.... Not an idea about how to share the image Can have another way to recive the image or ans CH4-CH3-CH3-CH3 |
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| 49878. |
Under what condition permanent electromagnet is obtained if a current carrying solenoid is used |
| Answer» The conditions required to obtain permanent electromagnet when a current carrying solenoid is used are:● The rod inside solenoid should be made of a magnetic material like steel, soft iron etc. This type of material can retain the magnetic properties for a long time after magnetization.● Direct current should be used for solenoid.● The turns should be closely packed and large in number for producing a uniform strong magnetic field | |
| 49879. |
Why ionic compounds are hard |
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Answer» .................................................................................................................................................... Ionic compounds are hard because it is made of oppositely charge. So,its intermolecular structure are very compact and force of attraction is very high Because they have strong intermolecular forces of attraction. |
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| 49880. |
Scientific name of amar bei |
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Answer» Cascuta Cascuta |
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| 49881. |
Example of amphoteric oxide |
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Answer» Oxides of metals which have both acidic as well as basic behaviour are known as amphoteric oxides. Such metallic oxides react with acids as well as base to produce salt and water. Examples of Amphoteric oxides are aluminium oxide and zinc oxide. Al203 ( al. Oxide), ZnO Aluminium oxide and zinc oxide... |
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| 49882. |
Name two traditional water harvesting methods |
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Answer» Khadins, tanks, nadis in Rajasthan, bandharas, tals in Maharashtra, ahars and pynes in Bihar, surangams in Kerala, bundhis in Madhya Pradesh, eris in Tamil nadu, Kattas in Karnataka are some of the water harvesting system. Two traditional water harvesting methods are jhalaras and talab |
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| 49883. |
Create a terrestrial food chain depicting four trophic level |
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Answer» The first level is called producers and this consist of producers which are the green plants. Then comes the second level called the primary consumers like earthworms, which feeds on the green plants. Next is the secondary consumers like hens, birds which feeds on the earthworms. 4th level is the tertiary consumers including vultures, eagles, etc. Grass -insect-frog-snake-hawk |
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| 49884. |
what is human hormone |
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Answer» Hormone is a substance similar to nutrients which help in growth and development of the body It is a chemical substance which is released in our body by a gland called endocrine gland. Hormones are chemicals released by the body to control and regulate the activity of certain cells and organs. Special glands known as endocrine glands secrete these hormones. |
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| 49885. |
What is the minium and maximum focal length of eye lens of normal person |
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Answer» Minium focal length of eye lensis 25/11cm and maximum focal length of eye lens is25 cm Focal length of lens of eye is adjusted accordingly to see an object using ciliary muscles, this ability of eye is called power of accommodation.But, focal length of eye lens can be decreased to only a certain extent. Eye lens has a minimum limit to decrease its focal length. This limit is 25cm from eyes. Minimum focal lenth is 25cm and maximum is infinite |
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| 49886. |
What is the function of villi in human body |
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Answer» They increase the surface area of the small intestine upto 40 times. Villi are finger like projection present at the walls of small intestine to absorb food or nutrition. Thanks Villi are the tiny finger like projections, present in the wall of small intestine. They increase the surface area so that maximum absorption of food can take place. |
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| 49887. |
Who is producer and consumer and consumers different think part |
| Answer» \tProducers - Producers are the organisms which can be prepare their own food from simple inorganic substances like carbon dioxide and water by using sunlight energy in the presence of chlorophyll.\t\tExample - Green plants and certain blue-green algae. \tConsumers - Those organisms which consume food (eat food) prepared by producers are called consumers.\t\tExample - Lion and Tiger.(i) The animals which eat only plants are called herbivores. All herbivores are primary consumers. Example – Goat and cow.(ii) The small carnivores which feed on herbivores (primary consumers) are called secondary consumers. Example – Frog and bird.(iii) The Large carnivores (or top carnivores) which feed upon the small carnivores (secondary consumers) are called tertiary consumers. Example – Lion and tiger.(iv) Those animals which eat both plants and animals, are called omnivores. Example – Crow, dog, man, sparrow. | |
| 49888. |
What is total internal reflection of light |
| Answer» Complete refraction of a ray of light within a medium such as water or glass from the surroundings surfaces back into medium. Ur answer ? | |
| 49889. |
What is Power accommodation |
| Answer» It is the maximum variation in power of eye lens for focussing near by or far objects clearly at retina. For a young adult it is about 4D. | |
| 49890. |
Calculate the total number of mole of atoms in 980gm of sulphuric acid |
| Answer» Sulphuric acid is H2SO4Molar mass= 2×1+32+4×16=98gmNo. of moles=given mass/molar massNo. of moles=980/98=10 moles | |
| 49891. |
What is thermal power plant? Explain it |
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Answer» In thermal power plants, steam at high pressure and high temperature is used to rotate large turbines. These turbines are connected to the generator which generates electricity. The steam later passed through condenser to cool it down and turn it into water. This water will again be used for producing steam A thermal power station is a power station in which heat energy is converted to electric power. In most places the turbine is steam-driven. Water is heated, turns into steam and spins a steam turbine which drives an electrical generator.After it passes through the turbine the steam is condensed in a condenser and recycled to where it was heated. This is known as a Rankine cycle. |
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| 49892. |
Why the current remains same in the series circuit |
| Answer» The amount of current in a series circuit is the same through any component in the circuit.This is because there is only one path for current flow in a series circuit. Because electric charge flows through conductors like marbles in a tube, the rate of flow (marble speed) at any point in the circuit (tube) at any specific point in time must be equal. | |
| 49893. |
Give arrhenius definition of an acid and base |
| Answer» Acids and bases are most important types of chemical compounds in the field of chemistry.There are many scientific definitions of these two types of chemical compounds.Among those definitions,the Arrhenius\'s definition is very popular.According to the theory of Arrhenius;Definition of acid and base are;1)Acid: A chemical compound which releases H+ ions in it\'s aqueous solution.2)Base: A chemical compound which releases OH- ions in it\'s aqueous solution. | |
| 49894. |
Importance of phisics |
| Answer» It is very important for our daily life | |
| 49895. |
How to convert ethanol to ethanal? |
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Answer» Ethanol is oxidised by acidified sodium dichromate in a test-tube reaction, firstly to form ethanal (acetaldehyde), and with further oxidation, ethanoic acid (acetic acid). Ethanol gets oxidised to ethanal with chromic anhydride dissolved in ethanoic acid. CH3CH2OH ---------------------------------> CH3CHO CrO3 in CH3COOH |
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| 49896. |
Which concept was not included in Charles Darwin\'s theory of natural selection explain |
| Answer» Darwin\'s theory of evolution is known as \'The Theory of Natural Selection\'. It can be described as follows:(i) Within any population there is natural variation. Some individuals have more favourable variations than others.(ii) Even though all species produce a large number of offspring\'s, populations remain fairly constant naturally.(iii) This is due to the struggle between members of the same species and different species for food, space and mate.(iv) The struggle for survival within populations eliminates the unfit individuals. The fit individuals possessing favourable variations survive and reproduce. This is called natural selection.(v) The individuals having favourable variations pass on these variations to their progeny from generation to generation.(vi) These variations when accumulated over a long period of time, lead to the origin of a new species. | |
| 49897. |
How ozone produced |
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Answer» In atmosphere, some OXYGEN (O2) absorbed energy from ultraviolet (UV) ray and split to for single oxygen atoms. This oxygen combined with remaining oxygen and form ozone (O3) molecule. Ozone is 03 molecule. It is formed when 02 molecule reacts with the free oxygen atom |
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| 49898. |
why the position of hydrogen does not stable in Modern Periodic Table? |
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Answer» U wlcm bro Thanku Because Hydrogen show both the property of metal and non metal and some time it react like halogen and sometime like alkali metal of group 1 Because hydrogen is a gas and also it is a non metal but even contain positive charge that,s why |
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| 49899. |
What is the 4 characteristic of isomarism |
| Answer» Isomers are compounds with same molecular formula but different structures. Four characteristics of isomers:\tIsomers have different physical properties.\tIsomers may have same or different chemical properties.\tAll isomers have the same number of atoms.\tIsomers have different structural arrangements. | |
| 49900. |
How to matle reacts with oxygen |
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Answer» Magnesium metal react with oxygen to form metal oxide . 2Mg+O2->2Mg0 Metals reacts with atmospheric oxygen and produces metal oxides that are basic in nature because they react with water to form bases. In case of rusting of iron, the iron reacts with the oxygen present in air and moisture and develops rust (hydrated iron (III) oxide). Metal react with o2 and form metal oxide |
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