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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.
| 50001. |
On what factors does the heating effect of electric current depends |
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Answer» According to Joule\'s law of heating, heat produced in the wire is directly proportional to the square of current, resistance of wire and time for which the current flows through the circuit.So, the heat produced depends upon:\tCurrent in the wire\tThe resistance of the wire\tTime for which the current flows through the wire Resistance TimeAmount of current Earlier ans. Was factors of resistance Sorry 1)lenght of the wire2)area of cross section 3)temperature4)nature of material |
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| 50002. |
Name the mechanism of regulating the production and release of precise quantity of harmone |
| Answer» Feedback mechanism ? | |
| 50003. |
Full detail explanation of science chapter 3 class 10 cbse board |
| Answer» Search it...frm Utube....#EDUMANTRA.? | |
| 50004. |
What is the name of the alcohol and acid that can be made from the ester ch3-coo-ch2-ch3 |
| Answer» C2h5oh alcohol and c2h5cooh this acid can be made from ester | |
| 50005. |
How we can attempt test of test series provided by this website? |
| Answer» On the homepage it is displayed - TEST SERIES | |
| 50006. |
What is terminology of concave mirror and convex mirror |
| Answer» \tSome terms related to spherical mirrors:\tThe centre of curvature (C) of a spherical mirror is the centre of the hollow sphere of glass, of which the spherical mirror is a part.\tThe radius of curvature (R) of a spherical mirror is the radius of the hollow sphere of glass, of which the spherical mirror is a part.\tThe pole (P) of a spherical mirror is the centre of the mirror.\tThe principal axis of a spherical mirror is a straight line passing through the centre of curvature C and pole P of the spherical mirror.\tThe principal focus (F) of a concave mirror is a point on the principal axis at which the rays of light incident on the mirror, in a direction parallel to the principal axis, actually meet after reflection from the mirror.\tThe principal focus (F) of a convex mirror is a point on the principal axis from which the rays of light incident on the mirror, in a direction parallel to the principal axis, appear to diverge after reflection from the mirror.\tThe focal length (f) of a mirror is the distance between its pole (P) and principal focus (F).For spherical mirrors of small aperture, R = 2f. | |
| 50007. |
Molten or aqueous state of ionic compound conduct electricity?Why |
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Answer» Molten Beaceuse molten sate have no ions but ionic compund have ions so they conduct electticity |
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| 50008. |
Why direction of current opposite to flow of electron? |
| Answer» In circuits using metallic wires, electrons constitute the flow of charges. However, electrons were not known at the time when the phenomenon of electricity was first observed. So, electric current was considered to be the flow of positive charges and the direction of flow of positive charges was taken to be the direction of electric current. The conventional direction of electric current is the one in which positive charges move orderly. | |
| 50009. |
Friends exam ki tayari kasi chal rahi hai |
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Answer» Awesome Good morning :-P okay:( Kuchh acchi nhi chal rahi yrr bas dar lag raha hai ? Bht acchi.. Hello Acchi Yeh bro Diksha agar aap insta pe ho to plz id dedo?mujhe kuch batana hai?? Achi hai tym nahi milta social media ke lia:(diksha 1130ke baad aaja Nicuuu Aap ka toh board ha Achi..... |
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| 50010. |
Write ancient method of water harvesting in two states of India |
| Answer» Rainwater harvesting is the collection of rain water falling on land for recharging the ground water. The structures of rain water harvesting are: Khadin, Tanks, Kulhs, Ponds, Eris, Tals and Kattas.Some of the ancient \'water harvesting structures\' used in different rural regions of our country are:\xa0\tStateWater harvesting structuresRajasthanKhadin, tanks, NadisMaharashtraBandharas, TalsUttar PradeshBhundhisMadhya PradeshBhundhisBiharAhars, PynesHimachal PradeshKulhsJammuPondsTamil NaduErisKeralsSurangams KarnatakaKattas\t\xa0 | |
| 50011. |
Explain why planets do not twinkle but stars twinkle? |
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Answer» Planets are much closer to the earth,and are thus seen as extended sources.? Planets, just like the Sun, do not twinkle. ... Due to the planets\' closeness to Earth, the light coming from these celestial bodies does not bend much due to Earth\'s atmosphere. Therefore, the light coming from our solar system\'s planets does not appear to twinkle like stars. |
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| 50012. |
What are vascular bundles |
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Answer» A vascular bundle is a part of the transport system in vascular plants. Vascular bundle is a unit strand of the vascular system in stems and leaves of higher plants, consisting essentially of xylem and phloem. Usually vascular bundle has phloem on the outside and xylem on the inside. Xylem and phloem tissue together known as vascular bundles. |
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| 50013. |
Describe two examples of different oxidations of ethanol. Name the products obtained in each case. |
| Answer» The two examples of different oxidations of ethanol are as follows:(i) When Ethanol is burnt readily in air with blue flame.The products obtained are carbon dioxide, water and release of heat and light.The chemical reaction is as follows:C2H5OH + 3O2 \xa0→ 2CO2 + 3H2O + heat + light(ii) When Ethanol is heated with alk. Potassium Permanganate solution KMnO4 or Potassium dichromate solution K2Cr2O7, the ethanol is oxidized to form the product as Ethanoic acid. | |
| 50014. |
What is meant by a sturated hydrocarbon? |
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Answer» A hydrocarbon in which the carbon atom connected by single bond In which corbons are connected with single bond is known as saturated hydrocarbon . Hudrocarbons with siingls bond between the carbon atoms are called saturated gydrocarbonz |
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| 50015. |
Define ‘evolution’. Describe Darwin’s theory of evolution. |
| Answer» Evolution : Evolution is the process of cumulative change in the heritable characteristics of a population.Darwin\'s Theory :All species of organisms arise and develop through natural selection of small, inherited variations that increase the individual\'s ability to complete, survive and reproduce. | |
| 50016. |
What is a *** chromosome? |
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Answer» Xx,Xy(in male) *** chromosomes of male is XY.....and of female is....XX... |
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| 50017. |
What are faraday\'s laws |
| Answer» Faraday’s first law of electromagnetic induction states thatwhenever a conductor is placed in the varying magnetic field, electromagnetic fields are induced known as induced emf. If the conductor circuit is closed, a current is also induced which are called induced current.Faraday’s Second LawFaraday’s second law of electromagnetic induction states thatthe induced emf in a coil is equal to the rate of change of flux linkage. Here the flux is nothing but the product of the number of turns in the coil and flux connected with the coil. | |
| 50018. |
What is the relation between work done and potential |
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Answer» Electric potential difference is known as voltage, which is equal to the work done per unit charge to move the charge between two points against static electric field.Voltage = work done/ Charge\xa0 Potential of 1 volt is applied to move 1 unit charge(work) from 1 point to otherV=W/T |
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| 50019. |
What do you mean by double fertilization in plant |
| Answer» Double fertilization : It occurs when one male nucleus fertilizes (fuses) with egg cell to form zygote cell and other male nucleus fuses (fertilizes) with two polar nuclei to cause triple fusion. As these two types of fertilizations take place at the same time in the ovule of the plant, it is known as double fertilization.After fertilization:(i) Ovary develops into fruit.(ii) Ovules develop into seeds. | |
| 50020. |
Why sodium and potassium is kept in kerosene oil |
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Answer» Sodium metal is highly reactive. If it is kept open it can explosively react with oxygen, carbon dioxide and moisture present in the air. They catch fire and start burning.To prevent this explosive reaction and the After Effects sodium is kept immersed in kerosene oil.Lithium, Sodium and potassium are also kept in kerosene oil they are also very reactive and catch fire easily. It is high reactive element it highly react with air in our atmoosphere |
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| 50021. |
How does we get ethanol from ethanal ? |
| Answer» By esterification process | |
| 50022. |
Define genotype |
| Answer» Charateristics of gene and not the changes in appearance? | |
| 50023. |
State one industrial application of reduction process |
| Answer» Addion of hydrogen and removel of oxygen | |
| 50024. |
What is alkene |
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Answer» It have double bond btw carbon atom ,it is unsaturated hydrocarbon and its formula is CnH2n Its double bond btw carbon atoms Triple bond btw carbon atoms...it is an unsaturated hydrocarbon |
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| 50025. |
Fecl3 + NaOH - Fe(OH)3 + NaCl |
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Answer» FeCl3 +3 NaOH - Fe(OH)3 + 3NaCl 2FeCl3 + 6NaOH - 2Fe(OH)3 + 6NaCl Balance this chemical equation |
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| 50026. |
What is meant by saponification? |
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Answer» The process of making soap. M v raat m aaunga Bye.. Raat me ayegi shyd.. Ab bye Ooooo....m to tha hi ni Ha..shaam ko aayi thi..? Shreya aayi thi kya aaj Hello..shreyas bro.. Hi bro The process of making soap. Shreya aayi thi kya Shreya aayi thi aaj?? Hii diku Okh ...? Nationalism in India.....avg 10 mark Sst me important chapters sbhi h Hlo Hello ji... ????? Hii suhu Ooo aakash Yll meko important chap btado.....mene sab padh liya hh but ab revision krne k mn nahi kr rha ....? Social bohot boring lagta haiii? Yll social padhne k mn nahi kr rha..??? I was in akash for 2yrs Suhana kaha chali jaati hoo??? Ye dusra saal h...9th se hu.... Hello Ooh?kabse ho allen me? Haan Allen h na....dummy School h mera...is liye...itne late Hm bihar se h....avi kota m Preboards itne late?? ?tum kaha se ho? Mera preboard to 21 se h Oooo haan yaad aaya Hmm shayad nhi tune bas brainly ki id di thi,, M yhi hu avi Shreyas gye kya?? Hamari baat hui h phle....??? And i m frm delhi? Ummm...haan ok i m shirin (intro over)? ??? Are yaar gussana mt....i don\'t know who r u....sorry Ghanta mst sab***hai Mat pucho yaar pre2 hai abhi 13 ko? Teri to mst hogi n padhai Thik hi h.... Sorry net=slo? Padhai kesi chal rhi hai??? Shirin ??? ??? Hi suhu Suhana chali gyi? Ni bhula ??? Bhool gye??? Bye! In this reaction soap and detergent are formed Who r u Hlo shirin ?? Hlo shreyas? It is a process in which oil nd fats are converted into soaps and alcohol with the action of heat in the presence of aqueous alkali ☺️☺️ Sst bohot tough lagta ??? Sci k mst hua...??????...kl sst k hh ? Mei theek ,padhai hai bas?,,,,,sci kesa tha? Kesi ho... ?? Hyy Hlw suhana? Hi It is process of making soap ? |
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| 50027. |
Why are thermal power plants located near coal and oil fields? |
| Answer» To lower transportation cost of bulky things like coal. | |
| 50028. |
Defination of 1 watt...? |
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Answer» Ur wlc Thnxxx It is the power of an appliances which consumes energy at the rate of 1 joule per sec. |
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| 50029. |
Difference between dominant and recessive characters |
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Answer» Dominant traits get expressed and recessive do not ...they need both the gametes to be same eg:tt? Dominant are ....... and recessive are........... |
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| 50030. |
What is dialysis bag? |
| Answer» | |
| 50031. |
How ammonia is formed ? |
| Answer» Reaction for the reaction for the formation of ammonia:N2\xa0+ 3H2\xa0→ 2NH31 mole of N2\xa0and 3 moles of H2\xa0so total 4 moles of reactants give 2 moles of ammoniaSince we are provided that only 10% conversion takes place,0.4 moles of reactants will give 0.2 moles of ammoniaAt STP, in term of molar volume:0.4 x 22.4 = 8.96 L of reactants will produce 0.2 x 22.4 = 4.48 L of ammonia | |
| 50032. |
The PH of a sample of vegetable soup was found to be 6.5 . how is this soup likely to taste |
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Answer» It is acidic but it have less ph value so it is not more acidic Ph less than 7 is acidic....Soup taste will be sour means weakly acid hence, acidic in nature Very less acidic 0.5 next to neutral !!! |
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| 50033. |
What is lime light? |
| Answer» Limelight is a type of stage lighting. | |
| 50034. |
I need a blue print of science board exam... |
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Answer» Or you can check sample papers of science for board exam 2020 in cbse official website.• Link :- cbse .nic .in U will find it in stores nearby ur house... |
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| 50035. |
Formula of enamel coating |
| Answer» Capo4 | |
| 50036. |
Why did mendel choose pea plant for observation?? ? |
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Answer» Hi Hii deepika Peas were an ideal choice for Mendel to use because they had easily observable traits there were 7 of which he could manipulate. ... Mendel planned to selectively cross pollinate the peas with one another to study the traits passed on and the results from each pollination. Many charisteristic changes are visible eg:color of flowers? Helllo Gregor Mendel chose pea plant because the garden pea is an ideal subject in the study of genetics for the following reasons:(i)They grow quickly.(ii)They have a short life-cycle.(iii)They are easily self- and cross-pollinated and produces many offspring in one cross.(iv)They have easily observed characteristics. Hello.. ? ??.. observation experiment.. It was a bisexual flower |
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| 50037. |
Explain the mechanism of extraction of metals according to their reactivity? |
| Answer» Extraction of Metals:Different methods are used for extracting metals belonging to category of highly reactive metals, moderately reactive metals and less reactive metals. This is because the extraction of a metal from its concentrated ore is essentially a process of reduction of the metal compound present in the ore. For example: Manganese metal is obtained by the reduction of its oxide with aluminium powder and not carbon. This is because carbon is less reactive than manganese. Carbon, which is a non-metal, is more reactive than zinc and it can be placed just above Zn in the reactivity series. Hence, carbon can reduce the oxides of zinc and all other metals below zinc to form metals. The reactivity of elements differs for different metals.Extraction of Less Reactive Metals:The less reactive metals are extracted by the reduction of their oxides by heat alone.Example: Mercury (II) sulphide ore is roasted in air when mercury (II) oxide is formed. When this mercury (II) oxide is heated to about 300° C, it decomposes to form mercury metal.\xa0Extraction of Moderately Reactive Metals:The moderately reactive metals in the middle of the reactivity series are extracted by the reduction of their oxides with carbon, aluminium, sodium or calcium.It is easier to obtain metals from their oxides (by reduction) than from carbonates or sulphides. So, before reduction can be done, the ore is converted into a metal oxide. The concentrated ores can be converted into metal oxides by the process of calcination or roasting.Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert it into a metal oxide.For example: When zinc carbonate is heated strongly in the absence of air, it decomposes to form zinc oxide and carbon dioxide.\xa0Extracting Metals towards the Top of the Activity Series:Metals high up in the reactivity series are very reactive. These metals have a strong affinity for oxygen. So, oxides of sodium, magnesium, calcium and aluminium cannot be reduced by carbon.These metals are obtained by electrolytic reduction. | |
| 50038. |
Why switch is always connected in live wire? |
| Answer» A switch is meant for the \'on-off\' of the device. It is always connected to live wire so that the appliance could be connected to high potential point through the live wire. The\xa0neutral wire doesn\'t have any voltage until it is connected to the live wire. So, it is always better to cut off the supply which is given from the live wire. | |
| 50039. |
Tracing the path of ray of light through a glass prism |
| Answer» When a ray of light passes through a prism, it bends towards the base of prism.The angle between incident ray and emergent ray is called angle of deviation. | |
| 50040. |
How a child reproduce throgh men and women describe briefly |
| Answer» On reaching puberty, one egg is produced every month by one of the ovaries in the females. The egg is carried from the ovary to the womb through a thin oviduct or fallopian tube. The two oviducts unite into an elastic bag-like structure known as the uterus. The uterus opens into the ****** through the cervix. The sperms of the male enter through the vaginal passage during sexual intercourse. They travel upwards and reach the oviduct where they may encounter the egg. The fertilised egg, the zygote, gets implanted in the lining of the uterus, and starts dividing. | |
| 50041. |
Derive OHM\'s law mathematically?? |
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Answer» V is directly proportional with I V= IRWhere R is proportionality constant V=IR |
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| 50042. |
Breaking and making of bonds in chemical reaction is called as |
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Answer» Thank you for your answer The making of bonds is called chemical bonding and the breaking of bond is called chemical disassociation. |
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| 50043. |
What is the first member of homologus series of ketone functional group |
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Answer» The functional group ketone is said to have\xa0one carbonyl group lies between two carbon atoms.Hence the first member of the functional group ketone must have three carbon atoms.Therefore the first member\xa0of the ketone is propanone. Propanone Cho |
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| 50044. |
If an object is moved from f to 2f of a concave mirror .The distance travelled by image is______ |
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Answer» Same as focal length might bw No Same as object distance. |
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| 50045. |
During a kreb cycle which cell organelles give enzymes....? |
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Answer» Krebb cycle is also part of class 10th.. cells generate energy during the process of aerobic respiration. It takes place in the mitochondria, using up oxygen and producing carbon dioxide and water as waste products, and ADP is converted to energy-rich ATP. Why are you not answering Kreb cycle is in class 11 Are you in class 11th ? |
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| 50046. |
What are morphological evdinces |
| Answer» Evidences of evolution:Some of the important sources which provide evidences for evolution are:(a) Analogous Organs: Organs which performs similar function but are different in structure and origin.Example - wings of a bird and wings of an insect.The presence of analogous organs indicates that even the organisms having organs with different structures can adapt to perform similar functions for their survival under hostile environmental conditions. Thus, the presence of analogous organs in different animals provide evidence for evolution by telling us that though they are not derived from common ancestors, they can still evolve to perform similar functions to survive, flourish and keep on evolving in the prevailing environment.(b) Homologous Organ: Organs which have different functions but similar structure and origin.Example - fore arm of frog, lizard, bird and human.The presence of homologous organs in different animals provides evidence for evolution by telling us that they are derived from the same ancestor who had the \'basic design\' of the organ on which all the homologous organs are based.(c) Fossils: The remains of dead animals or plants that lived in the remote past are known as fossils. The fossils provide evidence of evolution. For example, a fossil bird called Archaeopteryx looks like a bird but it has many features which are found in reptiles. This is because Archaeopteryx has feathered wings like those of birds but teeth and tail like those of reptiles. Therefore, Archaeopteryx is a connecting link between the reptiles and birds and suggests that birds have evolved from reptiles. Thus, fossils provide evidence that the present plants and animals have originated from the previously existing ones through the process of continuous evolution. | |
| 50047. |
Which chemical is used for artificial ripening? |
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Answer» Thanks☺ Artificial Ripening using ethylene gasEthylene is a hormone naturally produced within the fruits and regulates the fruit ripening by initiating and controlling a series of chemical and biochemical activities. |
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| 50048. |
Write the reaction of lead with heat????? |
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Answer» When lead nitrate [Pb(NO3)2] is heated, it forms lead oxide. The emission of brown fumes is also observed. Thesezbrown fumes are of nitrogen dioxide (NO2).The reaction that takes place is:Pb(NO3)2 + heat → 2PbO + 4NO2 + O2Lead nitrate lead Nitrogen Oxide dioxideThe above reaction is an example of decomposition reaction in which single reactant breaks down to give simpler products. PbO |
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| 50049. |
Define one ampere of current |
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Answer» When 1 columb charger flows in 1 second current is said to be 1 ampere The constant current which flowing in two infinetely long straight parallel conductors of negligible circular cross-section, placed in vacuum one metre apart, produces between them a force of 2× 10-7\xa0N per metre of their length. |
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| 50050. |
Difference between soaps ? and detergents |
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Answer» Soaps :\tSoaps are sodium or potassium salts of long chain carboxylic acids.\tSoaps have lesser cleansing action or quality as compared to detergents.\tSoaps are made from animal or plant fats.\tSoaps are more biodegradable.Detergents :\tDetergents are ammonium or solphonate salts of long chain carboxylic acids.\tDetergents have better cleansing action as compared to soaps.\tDetergents are made from petrochemicals.\tDetergents are less biodegradable. Next point mein koi bhi example likh lo?? Soaps are effective only in soft water while Detergents are effective in both hard and soft water. Soap is Sodium / Potassium salt of long chain of carboxylic acid while Detergents are ammonium / sulphonate salt of long chain of carboxylic acid |
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