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InterviewSolution
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.
| 66501. |
What are metal halides? |
| Answer» Some type of haloalkanes | |
| 66502. |
Name the mirrer that can give an erect and enlarged image of an object |
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Answer» Concave mirror Answer is concace mirror Bro mirror ki speling nahi ati hai kya Its Concave mirror Concave mirrer |
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| 66503. |
Y alcohol doesn\'t conduct electricity? |
| Answer» Due to not release of H+ ions when dissolved in water | |
| 66504. |
State the condition for no refraction.with prove. |
| Answer» | |
| 66505. |
State two ways by which the speed of rotation of an electric motor can be increased |
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Answer» And by increase and decrease magnetic field By giving more v and I |
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| 66506. |
Why do we boil leaf in alcohol while testing for starch?? |
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Answer» Because alcohol breaks down the chlorophyll taking green colour out of the leaf. So, when we put iodine solution in the leaf one of them will turn blue ensuring the presence of starch. To remove chlorophyll content from it as ethanol absorbs its chlorophyll Because alcohol extract chlorophyll from leaves |
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| 66507. |
What is mean by chamical reaction |
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Answer» Process in which two or more chemical combine or divide and mix to form new chemical substance with new and different property from the reactants. Chemical reaction are the process in which new substance and new property are formed The process in which the original substances (reactants) loose their nature and identity (by breaking of bonds) and form new chemical substances (products)by formation of new bond. Chemical reaction are the process in which two reactants combine and formed one product is called chemical reaction Chemical change occurs that chemical reaction |
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| 66508. |
How does nitrogen and oxygen form diatomic molecules? |
| Answer» | |
| 66509. |
How to understand a element is in a group of metalloids ? |
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Answer» Bus mil gayi ji aapko kya karna hai DEPENDS ON ITS NATURE METAL OR NON METAL AND ITS VALENCEY IS FOR Hope it helps you !!!If its valency is 4 ,then it is a metalloids...?? |
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| 66510. |
Wht is scum?? |
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Answer» That substance which is left on water surface when soap is disaolved in water it is white in color White dirty substance formed on reaction of soap with hard water is called scum. Same as vipul When soap react with hard water it form scum |
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| 66511. |
why eka_boron does not show similar properties like scandium |
| Answer» | |
| 66512. |
why sunrise is delay in winter season while earlier in summer season |
| Answer» | |
| 66513. |
How washing soda is obtained from baking soda? Write balanced chemical equation. |
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Answer» can u tell plz i m not able too find .... where It is provided in ncert |
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| 66514. |
Whar are the ways in which the depletion of ozone layer can be reduce |
| Answer» ●Using HYDROFLUROCARBONS.●Bann use of CFCs.●Precautions and carefull measures while burning any fuel | |
| 66515. |
Explain the preperation of bleaching powder and baking soda |
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Answer» Brine sol.+Nh3 +Co2=NaHCo3 Ca(OH)2 + Cl2 - CaOCl2 + H2OWhen calcium hydroxide is reacted with chlorine, bleaching powder is obtained. |
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| 66516. |
Write a importance of fuse |
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Answer» Fuse is a safety device which protects circuit and appliances from unduly high current.It gets melt due to high current and breaks circuit. it is saftey device to our circuit It protects the electrical appliances from high current. It breaks the circuit by melting from high current . |
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| 66517. |
Difference between permanent magnet and electro margnet ? |
| Answer» Permanent magnet:- 1.It has the weak force of attraction.2.we cannot change the pole of permanent magnet.3.and we also cannot change its magnetic force because it is permanent.Electro magnet:- 1. It is also known as temporary magnet. it has the strong force of attraction.2.we can change the position of poles.3.we can change its magnetic force by passing more current. | |
| 66518. |
What is mean by nastic movement |
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Answer» The directionless movements of plants caused due to the external variations in environment are termed as nastic movements.Various types of nastic movements are:i. Seismonsatic movements: The movement of a plant or its part in response to touch or any kind of shock. Example - the folding or drooping of leaves of ‘touch-me-not’ plant.ii. Nyctinastic movements: The movements of plants that occur in response to presence or absence of light (photonastic movements) or variation in temperature (thermonastic movements). The non directional movement of plants part is called nastic movement Non directional response to the external environment which may or may not be growth movements r called nastic movement. |
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| 66519. |
Fresh milk has a ph of 6 . How does ph will change as it turns to curd ? Explain your answer |
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Answer» When milk changes into curd (yogurt), its pH value decreases.This\xa0is because, during curd formation, Iactic acid is produced which rnakes it acidic.Curd is sour in taste and becomes acidic. Therefore, its pH will decrease from pH of 6 to a lower value.\xa0 When milk is turned into curd then its pH value will decrease due to the production of lactic acid in curd which is acidic in nature pH will changes to more acidic because of the formation of lactic acid when it changes to curd. ph will be lower than before as milk turns acidic when tirns to curd |
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| 66520. |
Give an example of a flower which contains both and carpeles |
| Answer» Thosa are bisexual flowers For Example- Hibiscus, Mustard? | |
| 66521. |
I want the marking scheme of every chapter. |
| Answer» | |
| 66522. |
Draw and describe the structure of human kidney.(5 marks question) |
| Answer» Kidneys are bean-shaped and located at the back of abdomen, one on either side of backbone.Its inner concave surface has a depression called hilum through which renal artery enters and renal vein leaves the kidney. Kidney has two regions: outer cortex and inner medulla. Each kidney has a large number of filtering units called nephrons | |
| 66523. |
In electrolysis refining which gas was produced at anode and cathode? |
| Answer» I think chlorine at anode and hydrogen at cathode | |
| 66524. |
what is the catalyst used in decomposition of potassium chlorate |
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Answer» Catalyst is use to fast the reaction When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. This reaction is used for the preparation of oxygen.2 KClO3(s) {tex}\\;\\xrightarrow{Heat}{/tex} 2KCl(s) + 3O2(g)If the decomposition is carried out in the presence of manganese dioxide (MnO2), it takes place at a lower temperature. In this case, MnO2 is used as a catalyst. Magnese(iv) oxide pls tell the answer |
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| 66525. |
whu do fireflies glow at night |
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Answer» ,. Due to the oxidation of protien luciferin Fireflies body has a chemical reaction in their body . when the oxygen combines with calcium, ATP, and luciferin in presence of luciferase, a enzyme, then the light produce.Fire flies have a special kind of substance, i.e. luciferin that undergoes oxidation in the presence of air and an enzyme. This reaction is accompanied by emission of light. Therefore, fire flies glow at night. abhi toh practice karo....bas wo hi aapki madat kar sakti h the tip is simple...understand the question first and then try to make the figgure....if you are able tp make the figure then the question would be simply done Because, a chemical name, luciferin which reacts, in the atmosphere, with oxygen and mg( magnesium) ions , the reaction takes olace producing light. |
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| 66526. |
Is u is negative in lens formulae |
| Answer» Yes u is always negative in lens and mirror formula.......... | |
| 66527. |
Describe the cleansing action of soap |
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Answer» \tWhen soap is dissolved in water, its hydrophobic ends attach themselves to dirt and remove it from the cloth.\tFirst, the molecules of soap arrange themselves in micelle formation and trap the dirt at the centre of the cluster.\tThese micelles remain suspended in water like particles in a colloidal solution.\tThe various micelles present in water do not come together to form a precipitate as each micelle repels the other because of the ion-ion repulsion.\tThus, the dust particles remain trapped in micelles (which remain suspended) and are easily rinsed away with water.\xa0\tHence, soap micelles remove dirt by dissolving it in water. Cleansing Action Of Soaps\xa0And Detergents. ... The molecule of\xa0soapconstitutes sodium or potassium salts of long chain carboxylic acids. In the case of\xa0soaps\xa0the carbon chain dissolves in oil and the ionic end dissolves in water. |
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| 66528. |
What is the Difference between saponification and esterfication |
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Answer» Sponification is the process of making soap by hydrolysis of fats and oils with alkali where as Esterification is the process in which ester is formed by reaction ethanol with ethanoic acid Esters are sweet smelling compounds with functional group COO . The reaction which results in the formation of esters are known as esterification reaction Saponification reactions are used to manufacture soapAcidic or bacis hydrolysis of ester is termed as saponification reaction Esterification: A process in which an alcohol and a carboxylic acid\xa0react in the presence of conc. H2SO4 to form an ester.CH3COOH + C2H5OH →\xa0CH3COOC2H5 + H2OEsters are used in ice creams and\xa0perfumes.\xa0Saponification: A process in which an ester reacts with sodium\xa0hydroxide to form sodium salt of an acid and alcohol. An ester\xa0reacts in the presence of an acid or a base to give back the\xa0alcohol and carboxylic acid.CH3COOC2H5 + NaOH → C2H5OH + CH3COONaSaponification process is used in preparation of soap.\xa0 Saponification is a reaction in which ester reacts with sodium hydroxide to form sodium ethanoate which is used in soap industries whereas in easterification ethanoic acid reacts with ethanol to form easter which is used in perfume industries. |
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| 66529. |
what are variegated leaves...give examples |
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Answer» A variegated leaf contains some part which is green and some part which is not green. The green part of the leaf is green in colour to the presence of chlorophyll and can perform photosynthesis, non green part does not have chlorophyll and hence is non-photosynthetic. Variegated leaves are those leaves which contain, both green and non green parts......, ex- adam\'s needle. |
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| 66530. |
What are different theory of origin of life? |
| Answer» 588745 | |
| 66531. |
Which bacteria is present in the human intestine? |
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Answer» Microbiyta Coliform bacteria Firmicutes, Bacteroidetes,Actinobacteria,Proteobacteria |
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| 66532. |
What is ozone layer depletion |
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Answer» Ozone layer contains O3 molecules. Due to cfc\'s O3 molecule gets divided into O2 and O. This creates whole on the ozone layer . This is called ozone layer depletion The thick layer of ozone is depletion by dangerour gases such as CFC and so on . CFC gase is release out by AC and REFRIGERATOR ,make it thin , which alloy to come UV ray from the sun and do many diseases like cataract e.t.c |
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| 66533. |
Please tell me about right hand thumb rule and left hand thumb rule |
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Answer» Right hand thumb rule is when u are holding a current carrying straight conductor in your right hand such that thumb points towards the direction of current then your fingers will wrap around conductor in direction of field lines of magnetic field Fleming’s Left Hand Rule: When a current carrying conductor comes under a magnetic field, there will be force acting on the conductor and on the other hand, when a conductor is forcefully brought under a magnetic field, there will be an induced current in the conductor. This is the working principle of a motor and a generator respectively. So, in a motor and a generator there is a relation between magnetic field, current and force.Fleming’s right hand rule: The direction of induced current in a conductor is given by Fleming’s right hand rule. It states that if we stretch the thumb, forefinger and the middle finger of right hand at right angle to one another in such a way that the forefinger points in the direction of magnetic field and the thumb points in the direction of motion of conductor then the middle finger will point in the direction of induced current. |
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| 66534. |
What is reflex arc and reflex action? |
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Answer» Reflex action is an involuntary action by the body.\xa0Reflex is an action generated by the body in response to the environment.Reflex arcs are formed in the spinal cord itself, although the information input goes on to reach the brain. Reflex action is the sudden response to the stimuli without the involvement of brain whereas the nerve pathway involves in a reflex action is called reflex arc. |
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| 66535. |
Why food chain contain only three or four process? |
| Answer» Any food chain contains not more than four or five tropic levels because according to 10%law, in each tropic level 10% of energy is passed to next level. So, upto fifth or fourth tropic level, no energy is left. | |
| 66536. |
What is esterification.....reaction...... Jai Dhama (Gujjar) samajh.... |
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Answer» Esterfication is a reaction between ethanoic acid and ethanol to form ester. Reaction of ethanoic acid and ethanol to give ester(ethyl ethanoate) is called easterification reaction. CH3COOH +C2H5OH GIVES CH3COOC2H5 |
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| 66537. |
Write four properties of homologous series. |
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Answer» Have same general formula,2 any to home logos difference by Ch 2 group and difference is 4 molecule molecular mass is 14 U, 3 have same chemical property,4 but show some gradual changes in physical properties Characteristics of homologous series:1. The members of a series have same functional group.2. Two consecutive members of a homologous series differs each other in their composition by –CH2unit.Example:Alcohol (-OH)CH3-OH , CH3-CH2-OH , CH3-CH2-CH2-OH3. The members of a homologous series can be represented by same general formula.Example: Alcohol è CnH2n+1OHAldehyde è CnH2n+1CHOCarboxylic acid è CnH2n+1COOH4. The members of a particular homologous series have almost same chemical properties due to presence of same functional group.5. The physical properties(like solubility, melting point, boiling point, state) of members of a homologous series either gradually increase or decrease with increase in molecular mass.6. The members of a homologous series can be prepared by same or common general method of preparation.7. The first member of homologous series generally shows certain different chemical behavior than other members of the series. |
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| 66538. |
Distinguish between term overloading and short circuiting as used in domestic circuit. |
| Answer» When excess current come in a circuit is called overloading and When live wire and nutral wire suddenly come in contact is called short circuit | |
| 66539. |
By what other name is the unit joule / coulomb called. |
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Answer» It is unit of potential difference Volt.. It is a unit of voltage |
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| 66540. |
Which is better recycle or reuse give reason with example |
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Answer» Reuse is better because in recycling also we r wasting few amount of energy. But reuse is done without any disadvantages. I think reuse bcoz it is easier to minimise pollution |
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| 66541. |
Why is small intestine in herbivores larger than in carnivorous |
| Answer» Because diet of herbivores are green plants which r made up of cellulose and hard to digest whereas carnivorous eat flesh and meat which is soft to digest. | |
| 66542. |
Give a short note about the feedback mechanism. |
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Answer» The excess or deficiency of harmones in the body has a harmfull effect on our body.Feedback mechanism makes sure that harmones are secreted in precise quantiries and at right time. Feedback mechanism regulates the timing and amount of secretion of the harmones by glands. It prevent from hyposecretion and hypersecretion. |
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| 66543. |
give reason Flow of energy in a food chain is unidirectional. S |
| Answer» if u know answer then tell plzz | |
| 66544. |
State two effects caused by refraction of light |
| Answer» | |
| 66545. |
when a beam of light is passedthrough a glass prism it split in to its component colours why |
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Answer» Due to refraction of light or scattering of light Due to refraction , the white light splits into 7 different colours when it is passed through a glass prism... It splits the colour in the order = Violet, Indigo, Blue, Green, Yellow, Orange,Red.... |
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| 66546. |
Differentiate between hydrogenation reaction and substitution reaction. |
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Answer» Substitution reaction -the reaction in which 1or more hydrogen atoms are replaced by some other atoms such as chlorine in presence of sunlight. Hydrogenation reaction- Reaction in which hydrogen is added to an unsaturated hydrocarbon in presence of catalysts such as nickel or palladium to obtain saturated hydrocarbon In hydregeneration hydrogen atom is added (adiction reaction) & in substitution reaction H atom is removed/displayed by a Hallogen (Cl,Br,etc..)✌ Virat Chapter?? |
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| 66547. |
Explain the role of kidney in excertion |
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Answer» Kidney have nephrons which filter the blood and removes the toxic from it ... It also helps in concentration of urine and its formation... Kidney have nefrons which filterate the blood and remove toxic material from it |
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| 66548. |
What is difference between magnetic field and magnetic lines |
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Answer» Magnet field is the are in which magnetic properties can be seen in other words are in which a magnet applying force & magnetic field is compost of magnetic lines coming from north pole to south pole outside the magnet forming circle\'s with different radius & common center thats why they dosent intersect each other ( if you dont understand this example the see NCERT CH- MAGNET PAGE SECOND LAST PARAGRAPH) Magnetic field in which magntism can be measuredMagnetic line it is a curved & straight along north to south pole |
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| 66549. |
What is Homeostatics???? |
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Answer» Its nit included in slyabus dont waste time if you are in CBSCE syllabus I read it from Arihant all in one book Is it an NCERT book questions ? but its not possible as ncert only have homologous Life processes ::: functions of kidney. Chapter? |
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| 66550. |
Differentiate between scavengers and decomposers. See u guys tomorrow. |
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Answer» Give your answer Ingle if you ,don\'t upload picture. Scavenger- they feed on dead plants and carcass of animals .they help to keep the earth\'s surface clean examples are crow , vultures, etc.Decomposers are are microorganisms that break down complex organic substances into simple organic substances. they convert the dead and decaying plant and animal remains into humas.they feed on the remains left by the scavengers . they too help to keep the forest surface clean\xa0 |
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