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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.
| 45451. |
What is the difference between carnivores and top carnivores. |
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Answer» Animals who eat both plants and animals are omnivores not carnivores Top carnivores are the top consumers in the food chainCarnivores are those who eats flesh of other animals Carnivores are those who eats only animals and top carnivores are eat all type of animals and plants |
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| 45452. |
Name all salts and formula |
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Answer» Common salt- NACLbleaching Powder- CaOCl2Baking soda- NaHCO3Washing soda- Na2CO3. 10H2O Names od salts in chap 3 areNaCl-sodium chlorideCaOCl2-calcium oxy chloride(bleaching powder)NaHCO3-sodium bicarbonateNa2CO3-sodium carbonate(washing soda)CaSO4.1/2H2O-plaster of paris |
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| 45453. |
Why DNA copying is important ? |
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Answer» DNA copying is important because#it contain information for inheritance of features from parent to next generation#DNA in the cell nucleas is the information source for making proteins#if the informayion is changed different proteins will be made and eventually lead to altered body designs DNA contains information for inheritance of feature from parents to next generation . DNA present in the nucleus of cell are information source of making protien . If the information is different the protein will make different that lead altered body design. |
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| 45454. |
What is fertilisation in plants |
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Answer» Fertilization in plants: In plants, pollination is followed by fertilization. Once the pollen grains are deposited on the stigma, it forms the pollen tube. The pollen tube grow through the ovules and reach the ovary where the egg cell is located. The pollen tube normally enters the ovule through a small opening called micropyle. Inside the ovule, the pollen tube releases two male gametes into the embryo sac. Same |
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| 45455. |
How the aquatic organisms respirate in water |
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Answer» Fish and sea animals usually have Gills that enable them to breathe underwater. The gills are organs that remove oxygen from the water. A fish breathes by taking water into it\'s mouth and letting it out through it\'s gills. Some exceptions are dolphins and whales because they are mammals and they must come to the ocean\'s surface to breathe. Aquatic organisms respirate by taking in the dissolved oxygen in the water. |
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| 45456. |
Name the essential component of a solar cooker that produces green house effect inside it ?? |
| Answer» Glass sheet | |
| 45457. |
Explain Mendel\'s concept of heredity, by giving three points? |
| Answer» Our understanding of how inherited traits are passed between generations comes from principles first proposed by Gregor Mendel in 1866. Mendel worked on pea plants, but his principles apply to traits in plants and animals – they can explain how we inherit our eye colour, hair colour and even tongue-rolling ability.Inheritance in pea plantsMendel followed the inheritance of 7 traits in pea plants (Pisum sativum). He chose traits that had 2 forms:\tPea shape (round or wrinkled)\tPea colour (yellow or green)\tFlower colour (purple or white)\tFlower position (terminal or axial)\tPlant height (tall or short)\tPod shape (inflated or constricted)\tPod colour (yellow or green). | |
| 45458. |
Why is sodium kept emmersed in kerosene oil? |
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Answer» sodium is kept in kerosene because it is a highly reactive metal and can react in air the kerosene helps to keep the air away from sodium thats why it is kept in kerosene Sodium and potassium are very reactive metals and and combine explosively with air as well as water. Hence, they catch fire if kept in open. Therefore, to prevent accidental fires and accidents, sodium is stored immersed in kerosene oil. Sodium is highly reactive metal it react with air to get burning ? flame.Hence it kept in kerosene. thanks That\'s why it is kept in kerosene oil Because if it reacts with air it starts burning |
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| 45459. |
What is least count of ameter |
| Answer» least count of the ammeter means that if an ammeter ranges 0 - 3 and consists 30 divisions then the value of each division called least count | |
| 45460. |
How analogous organs provide evidence for evolution |
| Answer» Analogous structures are those which are different in origin but similar in function. The existence of analogous structures suggest the occurrence of convergent evolution. It may be explained in terms of the environment, acting through the agency of natural selection, favouring those variations which confer increased survival and reproductive potential on those organisms which possess them. In this case different organs with different origins start performing similar functions and differ from their ancestral trait. | |
| 45461. |
Expalin xylum and phloem |
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Answer» Xylem is one of the important tissues of the vascular system of plants. The main activity of this tissue is to transport minerals and water from roots and carry them to other parts of the plants. It has two separate chambers tracheids and vessels for transporting minerals and water. The term xylem is derived from the Greek word –\xa0xylon meaning wood.Phloem is also important as the xylem tissues for vascular system of plants. The main activity of this tissue is to transport nutrients and food from leaves to other growing parts of plants. The term phloem is derived from the Greek word – phloios meaning bark. Xylem is a tissue which transports water and minerals to the plants.......phloem transports food to the plants..... |
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| 45462. |
What do you mean by genotype and phenotype |
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Answer» Phenotype= physical appearance and genotype= the gene pair combination which gives the phenotype , that gene pair pattern is called genotype Phenotype= physical appearance Genotype = genitical structure Phenotype : it is the appearance of an individual. Genotype : it is the genetic constitution of an organisms which determines the character. The genotype is the part of the genetic makeup of a cell, and therefore of an organism or individual, which determines one of its characteristics.A phenotype is the composite of an organism\'s observable characteristics or traits, such as its morphology, development, biochemical or physiological properties, behavior, and products of behavior. |
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| 45463. |
How can i learn to solve numericals in science |
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Answer» Learn formula and put the values in formula........... And also do not forget abouts the units.... By learning the formulas ,understanding the question and by practicing Practice.... |
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| 45464. |
What is snell\'s law of refraction?? |
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Answer» Snell’s law is defined as “The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media”. Snell’s law formula is expressed as:sini/ sinr = constant = μ Sin i/sin r= n which is a constant. According to snell\'s law ,the ratio of sin i of angel of incidence and the sin i of angle of refraction is constant Sin i =constant sin i / sin r = n (constant) |
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| 45465. |
What is the effect of increasing H+ion con. On the PH value? |
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Answer» As when the acid gets diluted .means addition of H+ions in it . Hence it would become more basic And pH would increaseHope u got ur answer? Expain your answer It will become more basici.e the pH would increase |
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| 45466. |
What is meant by transperation |
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| 45467. |
Why mainly chlorine is used in subsitution reaction |
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| 45468. |
What is formula for washing soda?? |
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Answer» Na2CO3.10H2O Na2CO3.10H2O |
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| 45469. |
What is transportation during day and night seprately in plants |
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Answer» Thanx for telling i have to charge my phone ok bye But during night no transpiration occur so root pressure is responsible for transportation of water and minerals in plants...Now what is root pressure??? Day, night kuch nhi hota..... aisa.... transportation bs xylem, phloem se hota hai okkk.....Plants have two different types of \'transport\' tissue. Xylem transports water and solutes from the roots to the leaves, phloem transports food from the leaves to the rest of the plant. Transpiration is the process by which water evaporates from the leaves, which results in more water being drawn up from the roots... Where as phloem transport food and required minerals............. |
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| 45470. |
What is difference between soapification and esterification |
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Answer» * Esterification= it is a reaction in Which alcoholS like ethanol react with carboxylic aciDs like ethanoic acid on warming in presence of few drops of sulphuric acid to form a sweet smelling ester or ethyl ethanoate: * CH3cooH. + C2H5OH. ____ H2so4_____ch3cooc2h5 + H2O * Ester is the main ProDuct of eSterification.which is used as a flavoring agent and also use in making of perfumes, Etc.* saponification= The alkaline hydrolysis of Ester using alkali (water soluble base) like sodium hydroxide is known as saponification.* ch3coohc2h5. + NaoH. -----heat----- ch3coona + c2h5oh* esters are used as reactant .for preparation of soap.which is used to clean dirty cloths Esterification is the reaction b/w ethanol (C2H5OH) and ethanoic acid (CH3COOH) in the presence of a few drops of Sulphuric acid give ester and water.Ester is a sweet smelling substance.Sanponification is the reaction of ester in the presence of an alkali like NaOH to get back the alcphol,i.e, ethanol and sodium acetate(CH3COONa+). Saponification reaction in preperation of soapCH3COOH+Na--->CH3COONa+H2OEsterification is used to make esters which are sweet smelling subsance.Esterification is a reaction between an acid and alchohol.C2H5OH+CH3COOH->CH3COOC2H5 |
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| 45471. |
Chemical formula of acetone |
| Answer» CH3COCH3functional group-ketone | |
| 45472. |
How much atp energy is realised when aerobic respiration occurs |
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Answer» 36-38 atp molecule 38 atp molecules 36-38ATP(1ATP=673kcal) |
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| 45473. |
Tindal effect |
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Answer» The scattering beam of light through colloidal solution The scattering of light through colloidal particles is called Tyndall effect. Its given on last page of human eye chapter NCERT Scattering of beam of light is known as tyndall effect I think it\'s in 9th class |
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| 45474. |
What is fertility time in female? |
| Answer» Fertility between sperm and ovum is done within 24hours from when sperm is released. | |
| 45475. |
Two components of peripheral nervous system |
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Answer» Somatic nervous system and automatic nervous system Cranial nerves(12 pairs) , Spinal nerves (31 pairs) Autonomic nervous system and voluntary nervous system |
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| 45476. |
Give the evidences on the basis of which it is concluded that birds have evolved from reptiles? |
| Answer» The structure of claws and wings of reptiles are mostly same but their functions are different | |
| 45477. |
What is autosomes and allosomes? |
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Answer» Autosomes are those chromosome in which there are not *** chromosome Autosomes are those chromosomes which are not *** chromosome there are 22 pair of autosomes..... |
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| 45478. |
What is e.m.f.?Describe how e.m.f. can be induced in a wire. |
| Answer» Electro motive force, it can be induced by back - forthing a magnet towards wire regularly. | |
| 45479. |
What does the degree of closeness of the field lines represent?? |
| Answer» It\'s strength. .Closer the field lines , stronger the magnetic force..and vice versa. | |
| 45480. |
Chemicals used for making soap |
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Answer» Ester and Noah ester and NaoH...can make a soap Glycerides |
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| 45481. |
Why is pure ironnot used for making Permanent magnet ? |
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Answer» Because pure iron get oxidises and get rusted easily in air. As the soft Iron cannot retain the electro magnetism after electric flow is stopped in the coil wound around the soft iron soft iron not used for making a permanent magnet. so the permanent magnets are made by the magnetic substances which can retain magnetism and have more retentivity like steel. |
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| 45482. |
To dry the hcl gas in humid climate...for experiment....from which sol it should be passed???? |
| Answer» Calcium chloride. | |
| 45483. |
Which metal have highest density |
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Answer» It\'s osmium Osmium |
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| 45484. |
what are phytoplankton |
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Answer» Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow. Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water. Phytoplankton also require inorganic nutrients such as nitrates, phosphates, and sulfur which they convert into proteins, fats, and carbohydrates. Phytoplankton are lowest level organism in food chain |
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| 45485. |
Why metals conduct electricity and glass does not? |
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Answer» Metals have free flowing electronic charge which helps them to conduct electricity Metals have free flow of electrons |
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| 45486. |
Longest cell in our body |
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Answer» Neuron Neuron longest cell in human body.... Thnks i just conforming Neuron |
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| 45487. |
Difference between Skull and Cranium |
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Answer» Yes it helped...i understood the difference between them...????? Maybe this answer help u Skull is the protective bony box for brain and cranium is the top part of skull |
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| 45488. |
If i only do oswaal sample papers than how many marks i can score in 10 board Science |
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Answer» Do last year question papers instead of sample papers....Alakh Pandey Sir\'s friend\'s students got 99%,99.5% so on by solving last ten years question papers.....???? 70% approximately it can be also 65% for more good marks u need to study ncert thorougly.....all d best? |
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| 45489. |
Name the common nutreants |
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Answer» The common nutrients be carbohydrates fats vitamins roughage protien Carbohydrates - our main source of energy.Fats - one source of energy and important in relation to fat soluble vitamins.Roughage (Fiber) - the fibrous indigestible portion of our diet essential to health of the digestive system.Minerals - those inorganic elements occurring in the body and which are critical to its normal functions.Proteins - essential to growth and repair of muscle and other body tissues.Vitamins - water and fat soluble vitamins play important roles in many chemical processes in the body.Water - essential to normal body function - as a vehicle for carrying other nutrients and because 60% of the human body is water. |
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| 45490. |
Chemical properties of Ethanoic acid & Ethanol |
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| 45491. |
MnO2 + 4HCl – MnCl2 +2 H2O + Cl2Name oxidised. Reduced oxidizing agent and reducing agent.. |
| Answer» In the reaction\xa0MnO2 + 4HCl -> MnCl2 + Cl2 + 2H2O , Cl (chlorine) is the substance which is oxidized from the HCl, and it is the reducing agent for the MnO2 as well. As Cl is the oxidized substance in HCl, thus it is the oxidizing agent in the reaction | |
| 45492. |
Why sun light appears white in noon |
| Answer» At noon, the sun is overhead in the sky and the light coming from the sun travels a relatively shorter distance through the atmosphere to reach the earth. In this case the blue light is not scattered much. As the light coming from the overhead sun contains almost all its component colours in the right proportion, the sun appears white to us at noon. | |
| 45493. |
Which metal oxide is used for printing black and white print on the paper? |
| Answer» Agcl....Agbr | |
| 45494. |
What is atomic number ?what is the atomic no of phosporus |
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Answer» \tThe total number of protons in the nucleus of an atom gives us the atomic number of that atom.\tIt is represented with the letter ‘Z.’\tAll the atoms of a particular element have the same number of protons, and hence the same atomic number.\tAtoms of different elements have different atomic numbers.\tFor example, all atoms of Carbon have the atomic number of 6, whereas all atoms of Oxygen have 8 protons in their nucleus.Atomic number of phosporus is 15. Atomic no. of phosphorous is 15 The atomic no of phosphorus is 15 the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place in the periodic table. |
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| 45495. |
Difference between clome and offspring |
| Answer» Key difference between offspring and clone is that offspring is product of sexual reproduction, biparental derived from two parents, meiosis occurs during formation of gametes, and due to recombination and segregation of gene offspring exhibits genetic variation whereas clone is the product of act of asexual mode of reproduction, monoparental derived from single parent, formed by only mitosis cell division, exactly resemble the parents and there is no recombination and segregation of genes so no genetic variation exhibits. | |
| 45496. |
Which bond is stronger in ionic or covalent and why? |
| Answer» Covalent have strong inter atomic bond bot dont have inter molecular bond.therefore it has low melting and boiling point.ionic bond have strong intermolecular force and so it has high melting and boiling point | |
| 45497. |
Why elements of different groups show different chemical properties |
| Answer» Valence eletrons are different for different elements | |
| 45498. |
How evoluation and classification are inter linked |
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Answer» Classification menas grouping of an organisms on the bases of particular characteristics. If an organisms have 2 or more chraracteristics in common they are more closely realated and if they are more closely related then they have a common ancestor. Consider the following eg. A girl and her brother is closely related because they have a common ancestor in the first generation namely their parents. A girl and her brother are also closely related because they also have a common ancestor in the second generation namely their grandparents but less closely related than her a girl and her real brother. Evolution menas a slow and gradual change which are brought about in living organisms with the passage of time when change from simple to more complex forms. The above discussion clearly proves that evolution and classification are interlinked with each other which is similar like creating an evolutionary tree. Homologous seriesAnalogous seriesIt may help to trace evolution of an organismSo classification is interlinked |
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| 45499. |
Which one is more reactive metal in magnesium or barium? |
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Answer» As we move down the group reactivity increases beacause number of shells increases and the valence electrons of larger atomic size can be losed easily therefore barium is more reactive than magnesium Plz give me reason.... Barium |
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| 45500. |
Why do some hydrocarbon burns with yellow and blue flame |
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Answer» Because the percentage of carbon in butane which is comparably low is completely oxidised by the oxygen present in air \tSaturated hydrocarbons generally give a clean blue flame because complete combustion of these substances takes place.\tSaturated hydrocarbons burn with a yellow flame with lots of black smoke due to the incomplete combustion of carbon contents. |
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