Saved Bookmarks
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.
| 55301. |
How does scum form ?? |
|
Answer» Scum forms when long chain of carbon reacts wiyh calcium and magnesium found in hard water When a soap is used in hard water, a solid substance we call scum forms. This is because charged calcium and magnesium particles (called ions ) present in the water react with soap to form an insoluble substance. Scum builds up on clothes, baths and sinks. Detergents do not form scum. |
|
| 55302. |
Why chlorine float on water |
|
Answer» It consist of oil .... may be It might be less denser than water I just guessed it |
|
| 55303. |
What are hydro power plant |
|
Answer» \tDams are constructed at heights to obstruct the flow of water and store it. The stored water has Potential Energy.\tWater stored in heights now is allowed to flow to low levels. The potential energy is converted to kinetic energy and moves the turbines.\tElectricity is produced.\tThis is called Hydroelectricity because the potential energy of water which is stored at elevated heights is converted into kinetic energy of flowing water which in turn is converted electricity\tIt is a renewable source of energy, since rainfall comes over and over again.\tMost of the electricity in India is generated in this method. Since there are not many natural waterfalls, dams are constructed to store water at heights and then allowed to fall and this energy is used to move turbines and thereby generate electricity. The power plants which convert the kinetic energy of flowing water into electricity are called hydro power plant |
|
| 55304. |
Electronic cnfiguration ofthe element having atonic number 21 |
|
Answer» Scandium has the following electric configurationK cell~2L cell~8M cell~8N cell~3. 2, 8, 8, 3Scandium |
|
| 55305. |
What is mirror and how many type of them |
|
Answer» Any transparent material which is silvered from one side is called mirror.There are two types of mirror:1) plane mirror2) curved mirror A piece of special flat glass that u can look into in order to see urself . And the two types of mirror are convex mirror and concave mirror Mirror :a piece of special flat glass that you can look into in order to see yourself or what is behind you. There are three type of mirror (i) Concave mirror (ii)Convex mirror (iii) Plane mirror |
|
| 55306. |
Explain oxidation reaction with the example of methanol and ethanol |
| Answer» Ethanol undergoes oxidation in presence of Potassium dichromate to form intially ethanal and finally formsfurther oxidised ethanoic acid.CH3-CH2-OH + K2Cr2O7 → CH3-CHO →CH3-COOH | |
| 55307. |
what do you mean by homologioues siries explain one example |
| Answer» A homologous series means the organic compounds which can be represented by same general formula with a same functional group.It shows similar trends in their properties.... E.g :- alkanes is represented by the same general formula CnH2n+2 and alcohols by CnH2n+1OH... | |
| 55308. |
explain saturated and unsaturated hydrocarbon with structural and chemical formula till five carbon |
| Answer» Saturated hydrocarbons: Hydrocarbons having single bonds are known as Saturated hydrocarbons. Saturated hydrocarbons are known as ALKANE. These are also known as paraffin. Example: Methane, Ethane, Propane, etc.Unsaturated hydrocarbon: Unsaturated hydrocarbons are of two types of Hydrocarbon with double bond and hydrocarbon with triple bond.Hydrocarbon with double bond: Hydrocarbons having at least one double bond are known as ALKENE. Example: Ethylene, Propylene, Butylene, etc.Hydrocarbon with triple bond: Hydrocarbons having at least one triple bond are known as ALKYNE. Example: Ethyne, Propyne, Butyne, etc. | |
| 55309. |
Explain cool and bond with the help electrons structure in methane and nitrogen |
| Answer» | |
| 55310. |
explain autottrops of carbon |
|
Answer» Autotrops of carbon is mainly diamond nd graphite The substance made up of carbon which have same chemical properties but differ in their structural formula is known as autotrops of carbon. Such as.diamond graphite fullerene |
|
| 55311. |
what is amphotric oxide |
|
Answer» It is an oxide that can act as either an or base in a reaction to produce a salt n water. Amphoterism depends on the oxidation states available to a chemical species. Because metals have multiple oxidation states, they form amphoteric oxides and hydroxides. Oxides of those metals that show both acidic and basic property. |
|
| 55312. |
Practical on evolution of carbon dioxide gas |
| Answer» | |
| 55313. |
Why ? twinkle |
| Answer» because of the light passes from many layers by which light reflect so stars seem twinkling | |
| 55314. |
Bb |
| Answer» What is Bb | |
| 55315. |
Different between blind spot and yellow spot |
| Answer» The spot at the back of the eye, from where optic nerve fibres leave is free from rods and cones. This spot is devoid of the ability for vision and is called blind spot. Yellow spot or area centralis or Macula lutea is in the exact centre of the retina. | |
| 55316. |
Define ellils? |
| Answer» Allels Every factor or gene found in pair. This pair of gene is said as allels.Example: TT, tt. | |
| 55317. |
Difference between monhybrid and dyhbrid |
| Answer» Monohybrid= if one trait is considered in hybridization than it is monohybrid cross.Dihybrid= if two trait are considered in hybridization than it is dihybrid cross. | |
| 55318. |
What are limitation of using wind energy |
| Answer» Wind energy has a drawback that it is contant energy source .Wind turbines produces noise and visual pollution .Not a profitable use of land . Threat to wildlife .U can elaborate these points . | |
| 55319. |
What is significantion of human faction |
| Answer» | |
| 55320. |
How is sperm secereats by ***** |
|
Answer» ***** Testis From vas defrens to ureter than comes out from ***** |
|
| 55321. |
What is exhaustable |
|
Answer» In simple words the things that get finished due to over use e.g petrol, coal ect ....... Something that can be vanished in due course of time. |
|
| 55322. |
what is preciption reaction |
| Answer» A type of reaction in which a precipitate i.e. a layer is insoluble metal in the solution is known as precipitation reaction. | |
| 55323. |
Short sentances on topic chipko movement |
|
Answer» \tThe Chipko movement started in Garhwal region of present Uttarakhand in 1870s.\tWomen and men in this region came together to protest against the indiscriminate felling of trees by the contractors.\tThey were opposed to the use of forests for commercial gains.\tGradually, the protest turned into a movement.\tThe government imposed a 15 year ban on felling green trees in the Himalayan forests. Hi |
|
| 55324. |
Necular fission |
|
Answer» 235 of Uranium is its atomic mass It is a type of nuclear reaction in which the nucleus of an atom is bombarded with a slow moving neutron. Example : Uranium-235 atom is bombarded with a neutron, the atom splits in to barium -142 and krypton-92 , ejects 3neutrons and releases tremendous amount of energy. |
|
| 55325. |
What are acids? Give three chemical properties of acids .Give the test for acids . |
| Answer» Acids are sour substance that chage blue litmus to red. Chemical properties: 1 reaction of acid and metal gives salt n water.2 reaction of acid with metal carbonate gives salt, co² , water.3 reaction of acid and base gives salt n water. | |
| 55326. |
Which phenomenon is responsible for increasing the apparent length of the day by 4 min |
| Answer» Atompheric refraction | |
| 55327. |
What are barrier methods |
| Answer» Copper T | |
| 55328. |
How sperm comes in contact with ova |
| Answer» | |
| 55329. |
What is blue print in reproduction |
|
Answer» DNA (deoxyribonucleic acid ) DNA |
|
| 55330. |
What is double fertilisation in flowering plant. |
| Answer» Fertilisation is the process of fussion of male and female gametes. In plants transfer of pollen grains from stigma to ovary. For this to happen a tube grows out of the pollen grain. The pollen travels through this tube through the style to reach ovary. The pollen tube enters the ovary through an opening called micropyle. Here it releases\xa02 male gametes in the embryo sac in which one male gamete fuses with one female gamete. This is known as syngamy. The other male gamete fuses with two other polar nuclei. This is known as triple fusion. Syngamy along with triple fusion is defined as double fusion. | |
| 55331. |
What are groups and periods. Write some features of groups and periods of modern periodic table |
|
Answer» The long form of periodic table consist of vertical columns called groups and horizontal rows called periods.Salient feature of the Modren periodic table are: 1. the periodic table has 18 vertical columns called groups. and seven horizontal rows called periods. 2. The elements of group 1,2, 13, 14, 15 , 16 and 17 are known as the main group or representative elements. 3.The elements of group 3,4,5,6,7,8,9, 10 ,11 and 12 are known as transition elements 4. Element 18 are called noble gases or inert gases. 5.The first period contains only 2 elements and is the shortest period. 6. The second and third period contain 8 elements and is called short period. 7. The fourth and fifth period contains 18 elements. these are long periods. 8. The sixth period contain 32 elements . it is longest period. 9. The seventh period is incomplete. 10. in group 3 of sixth period there is set of elements with atomic number 57 to 71 . they are known as lanthanides. 11. In group 3 of seventh period the elements with atomic number 89 -103 are known as actinides.
|
|
| 55332. |
What is estarification and sponification |
| Answer» Esterification : The reaction in which a carboxylic acid combines with an alcohol to form an ester is called esterification. Esters are formed.Saponification : The alkaline hydrolysis of esters is known as saponification. Soap is formed. | |
| 55333. |
Name a common nutrient that is absorbed in small intestine |
| Answer» The small intestine, despite its name, is the longest part of the gastrointestinal tract. It works with other organs of the digestive system to further digest food after it leaves the stomach and to absorb nutrients. The entire digestive system works together to turn the food you eat into energy. | |
| 55334. |
Explain law of segregation, law of independent assortment with examples? |
| Answer» Law of segregation - During gamete formation the genes of a particular character separate and enter different gametes. This is the law of segregation. This law is also called law of purity of gametes.Example: During gamete formation the paired factors (Tt) present in the F1 plant segregate independently and enter different gametes. So each gamete receives either T or t from the paired factors Tt, which are responsible for the expression of a single character.Law of independent assortment - This law is based on dihybrid experiment. According to this law, the genes for each pair of characters separate independently from those of other characters during gamete formation.Example: Consider a plant with yellow round (YYRR) seeds being crossed with another pea plant with green wrinkled (yyrr)\xa0seeds. During gamete formation of a dihybrid cross, the factors for yellow colour assort out independently of the factors for round shape.The gene Y may combine with the dominant gene R or the recessive gene r of the other character and enter a gamete. In the same way, the gene y may combine with the dominant gene R or the recessive gene r and enter another gamete. So the F1 dihybrid plants produce four types of gametes and they are YR, Yr, yR and yr. | |
| 55335. |
Define allotropy |
|
Answer» The phenomenon of existence of an element in 2 or more forms which have different physical properties but identical chemical properties The ability that certain substances have to exist in more than one physical form |
|
| 55336. |
What is parasitic and give one example. |
|
Answer» Parasitism is the association between two organisms in which one organism is benefitted and another organism is harmed.Parasites that feed on the external surface of the host organism are called ectoparasites.Example: The lice on humans and ticks on dogs Those who depend on others and feed on death and decay organismsEx-fungi |
|
| 55337. |
Describe structure of traditional water harvesting system with diagram |
| Answer» In largely level terrain, the water harvesting structures are mainly crescent shaped earthen embankments or low, straight concrete and rubble “check dams” built across seasonally flooded gullies. Monsoon rains fill ponds behind the structures. Only the largest structures hold water year round; most dry up six months or less after the monsoons. Their main purpose, however, is not to hold surface water but to recharge the groundwater beneath. The advantages of water stored in the ground are many. It does not evaporate, but spreads out to recharge wells and provides moisture for vegetation over a wide area. In addition, it does not provide breeding grounds for mosquitoes like stagnant water collected in ponds or artificial lakes. The groundwater is also relatively protected from contamination by human and animal waste. | |
| 55338. |
What is a cotyledon |
| Answer» Cotyledons are the stored food inside the seed of a plant which the baby plant uses for its growth and energy fulfillment. | |
| 55339. |
Diff. B/w biodegradable and non biodegradable substance |
|
Answer» Decomposable from bacteria is biodegradable substances and which is not is non biodegradable The substance which is decomposed by the certain bacteria and the non biodegradable are the substances which are not decomposed by the bacteria Those substances which can decompose by essential agent is called biodegradable substance and viceversa |
|
| 55340. |
Why herbivorous animals have long small intestine? |
|
Answer» In order to digest cellulose which is a complex stuff Because herbivores animals eat food having complex cellolus and to break down into small pieces for proper digestion they have to be in small intestine for longer time so small intestine is to be long Because grass and plant foods take more time to digest properly Grass and plant foods takes more time to digest properly |
|
| 55341. |
What is generator?write its priniciple |
|
Answer» Generator is a device which convert mechanical energy into electrical energy its principle is generate electric charges It is a device that converts mechanical energy to electrical energy. It is based on the principle of electromagnetic induction which states that when there is a relative motion b/w magnetic field and coil then it will induce current. An instrument which converts mechanical energy to electric energy |
|
| 55342. |
Define the term \'electrolysis.\' |
| Answer» Electrolysis is the process by which ionic substances are decomposed into simpler substances when an electric current is passed through them. In the medieval times, aluminium was almost as precious as silver. Its extraction was not known and pure aluminium was extremely hard to come by. The application of electrolysis turned aluminium from a precious metal to one of the most largely used metals by humans. Aluminium is extracted from its ore by the process of electrolytic decomposition and deposition. | |
| 55343. |
importance of decomposition reaction |
| Answer» 1.Thermal decomposition is used for the production of calcium oxide (quick lime ) from calcium carbonate which is a major constituent of cement.2. Rancidity can be prevented by adding antioxidants to food containing fat and oil, e.g. butylated hydroxy anisole is added to butter as antioxidant.3. It can be prevented by packaging fat and oil containing foods in nitrogen gas.4. Molten NaCl is electrolytically decomposed to form sodium metal.5. Aluminium metal is obtained by electric decomposition of bauxite ore mixed with cryolite. | |
| 55344. |
Are evolution and progess similar and equal? if not then give reasons.. |
|
Answer» No i want reasons.. please No |
|
| 55345. |
What is imp. DNA copying during reproduction? |
| Answer» It transport the characteristics of their parents or fore fathers | |
| 55346. |
Name any one catalyst |
| Answer» Hydrogen peroxide | |
| 55347. |
What is umbillical cord? |
| Answer» The tube that connects a baby to its mother before it is born. | |
| 55348. |
What is reflex actions . |
|
Answer» Reflection is bouncing back of light or any object is known as reflection. ... if a doing action of reflection then it is known as reflex actions Hope it helps ☺ your welcome Yes thank you Aarna chaudhari I wish this will help u for understanding reflex action is an involuntary and instant movement ex : digestion, excretion etc... |
|
| 55349. |
What is vanderwall forces |
| Answer» Van der Waals forces, relatively weak electric forces that attract neutral molecules to one another in gases, in liquefied and solidified gases, and in almost all organic liquids and solids. The forces are named for the Dutch physicist Johannes Diderik van der Waals, who in 1873 first postulated these intermolecular forces in developing a theory to account for the properties of real gases. Solids that are held together by van der Waals forces characteristically have lower melting points and are softer than those held together by the stronger ionic, covalent, and metallic bonds. | |
| 55350. |
What is a critical angle ???? ...... Plz explain through a prism . |
| Answer» | |