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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.
| 49651. |
Oxide formula of carbon |
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Answer» CO2and CO Carbon dioxide and carbon mono oxide |
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| 49652. |
What do you understand by reractive index |
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Answer» Thanks A ray of light changes its direction when it enters from one medium to another medium. This happens because speed of light is different in different media. For example; the speed of light is 3 x 108 m/s (2.99x108 m/s) in vacuum and it is 2.98 x 108 m/s in air.Refractive Index is the extent of change of direction of light in a given pair of media. The refractive index is a relative value of speed of light in the given pair of media. Thus, to calculate the refractive Index the speed of light in two media is taken. |
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| 49653. |
Why is twinkling stars |
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Answer» The continuously changing atmosphere is able to cause variation in the light coming from. Sai star due to reflection because of which the star appear to be twinkling. Due to atmospheric refraction, because the star light to reach the human eye in many layer of Earth Due to atmospheric refraction , they look different from their appparent position. And they look at different position from their original position....... Why is twinkling stars Due to Atmospheric refraction.... |
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| 49654. |
Is ethanol C2H5OH acidic in nature ???? |
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Answer» Yes it shows acidic characters in some cases like esterification Lekin yaar when we mix it with water it neither liberates H+ ions nor OH- ions .So its contradictory ? Yes absolutely Nahi bahi No Yo No, because it has OH group with the alkyl group having H ions so ethanol is neutral as H and OH together makes H2O that is neutral with a pH of 7 Yes Yep? Yes ethanol is acidic in nature because it turns blue Litmus to red when he was reacted with ethanoic acid after the Oxidation reaction you should check ethanol is an acidic in nature |
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| 49655. |
Cbse question papaer 2017 |
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| 49656. |
What is code of monohybrid and dihybrid crosses (biology) |
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Answer» \xa0 Monohybrid cross is a cross between parents differing in only one trait or in which only one trait is being considered. Dihybrid cross is a cross between parents\xa0in which two pairs of contrasting characters are studied simultaneously for the inheritance pattern. What mean code |
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| 49657. |
Write differences between resistance and resistivity? |
| Answer» \tSl. No.Differentiating PropertyResistanceResistivity1DefinitionResistance is the physical property of a substance because of which it opposes the flow of current i.e. electrons.Resistivity is the physical property of a particular substance which is having particular dimensions.2ProportionalityResistance is directly proportional to the length and temperature while it is inversely proportional to the cross-sectional area of the material.Resistivity is only proportional to the nature and temperature of the particular material.3SymbolRρ4FormulaR = V/I or, R = ρ(L/A)\xa0V = Voltage, I = Current, ρ = Resistivityρ = (R×A)/L\xa0R = Resistance, L= Length, A = Cross-sectional area5SI UnitsThe SI unit of resistance is OhmsThe SI unit of resistivity is Ohms-meter.6ApplicationsThe property of resistance is used in several places like heaters, fuses, sensors, etc.Electrical resistivity measurement is used as a quality control test for calcareous soil.\t | |
| 49658. |
Answer me If I become a forest officer what would I do??? |
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Answer» ? You should strictly prohibit the cutting of trees, you should encourage people to plant more trees, you should spread awareness of trees, you should also tell everyone the importance of trees...e.t.c. Good question |
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| 49659. |
Part which secreat hormone as well as digestive juice |
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Answer» Pancreas Pancrease Pancreas,Since it secreses pancreatic juice (digestive juice) and insulin(hormone). Pancreas |
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| 49660. |
What is mean by chloroform? |
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Answer» It is a compound of a carbon Trichloromethane CHCL.3 and also known as methylamine trichloride Chloroform is a compound of carbon |
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| 49661. |
When is the force experienced by a current carrying conductor place in a magnetic field is largest |
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Answer» When it is kept perpendicular to the magnetic field lines At poles The force on current carrying wire is maximum only when the wire is perpendicular to the direction of magnetic field. When the direction of force is perpendicular to the direction of current and magnetic field. When the conductor is placed nearer to the magnet |
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| 49662. |
What is the use of oxidation in our daily life |
| Answer» Oxidation: The reaction which involves addition of oxygen (or) removal hydrogen or increase in the oxidation state of central atom is called oxidation reaction.Ex:(i) Formation of rust on the Metal surface.(ii) Burning of Fuels.(iii) Burning of Carbon.(iv) Burning of Hydrocarbons.(v) House-hold aluminum utensils over period of time undergoes oxidation process.(vi) Digestion of food.(vii) Formation of water from Hydrogen and Oxygen. | |
| 49663. |
Send questions |
| Answer» Which chapter?? | |
| 49664. |
What is myopia ? What are the causes of myopia? |
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Answer» I hope it will help u... Myopia is that defectbof vision due to which a person can\'t see the distance object clearly but he/she can see the nearby object clearly.........CAUSE OF MYOPIA........1..Due to excessive curvature of eye lens.......2..Due to eye ball be too long When person can not see the distant objects clearly is called myopia.Elongation of eye ball& Increase in focal length Myopia is the defect of the eye vision due to which a person can see the near by objects clearly but cannot see the far objects so distinctly.Causes of myopia: Myopia is caused:—due to the elongation of the eyeball.—due to decrease in the focal length of the eye lens.Myopia can be corrected by using a concave lens of suitable focal length in the spectacles of such a person. Myopia is a type of eye dieases.the person suffering from myopia can\'t see distinct object clearly. It can be correct by using cocave lens.a |
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| 49665. |
What is live wire |
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Answer» It is red in colour Having pd at 220-300V Having p.d. of 220V |
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| 49666. |
How variation is caused in an organism |
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Answer» Due to DNA The difference in DNA from F1 to F2......so on cause variation in an organism Change in DNA of germ cell cause variations due to any environmental condition. |
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| 49667. |
Give the examples of autoreduction |
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| 49668. |
Why there\'s only four trophic level in nature |
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Answer» Any food chain has a maximum of only 4 or 5 trophic levels.This is because according to the 10% law of transfer of energy, only 10% of the energy of any organism at a perticular trophic level is available to another organism at the higher trophic level.So, their is very less energy available for the organism at the 4th or the 5th trophic level. Acording to 10%law only 10% of energy is required organism |
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| 49669. |
What are the characterstics of carbon and its compound |
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| 49670. |
List two different between acquired traits and inherited traits by giving an example of each |
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Answer» ♧Aquired traits ●The traitswhich are aquired by an individual during his/her life style and are not propogated to the upcoming generation.●these traits are not associated with the DNA of an individual ■for eg proficiency over a languave ♧Inherited trait ●they are the traits which are inherited by an individual from its previous generation in form of genes and can possibly be carried in future genertion.●these traits are assosiated with the DNA of an individual ■for eg eyes, ear,nose,hair,skin what is sodium kept immersed inkerosen |
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| 49671. |
Why magnesium does not react with cold water? |
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Answer» Because it becomes coated with magnesium hydroxide which is insoluble, so prevent water coming in contact with water. Because magnesium becomes coated with Magnesium hydroxide which is insoluble, hence do not react with cold water. |
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| 49672. |
Modern periodic laws |
| Answer» propeties of element are periodic fuction of their atomic number | |
| 49673. |
Give the function of armature, brushes and split rings in an electric motor |
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Answer» Brushes - It conducts current between stationary wires and moving parts, most commonly in a rotating shaft. Split rings - It helps to reverse the direction of current in circuit. Amarture- It is a rectangular iron core wrapped by the copper coil through which electricity passes and due to magnetic field it experiences a force and rotates. |
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| 49674. |
Why acid should be added to water not water in acid why |
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Answer» Because adding water to acid is a highly exothermic reaction which produces a large amount of heat which can be harmful and the solution can split out of the test tube. Because adding water in a test tube filled with acid will cause exothermic reaction which would produce a lot of heat which would be harmful Becoz adding water in acid is a highly exothermic reaction.When we add water in acid,it produces a lot of heat which may cause the apparatus tu blast and cause accidents |
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| 49675. |
Definition of hydrocarbon. |
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Answer» Hydrocarbon is an organic compound consisting of mainly carbon and hydrogen. Thnx for the solution Organic compounds which contains only carbon and hydrogen are known as hydrocarbon. |
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| 49676. |
What is the difference between locomotion and motion |
| Answer» \tLocomotionMovementMoving away from the original position of an organism is locomotion.Movement can happen with or without moving away from an organism’s original position.It is always voluntary.It can either be voluntary or involuntary.Locomotion takes place at the organism level.A movement takes place at the biological level.Locomotion doesn’t necessarily require energyMovement requires energy.\t | |
| 49677. |
What do you understand by bonds ? |
| Answer» Chemical bonding refers to the formation of chemical bond b/w two or more atoms , molecules , or ions to give rise to a chemical compound. | |
| 49678. |
Zinc libarate hydrogen gas with dilute hydrochloric acid, whereas copper does not. Explain why? |
| Answer» This is because of the reactivity of metal so that hydrogen gas is libreateď | |
| 49679. |
How i check class 10 cbse board examination paper pattern. |
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Answer» If it is true..then don\'t thanks this ans Sis u see it from arihant new edition sample paper..in this it is given standard and basic both https://images.app.goo.gl/uv4HA1UiSAUQeUkB8 |
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| 49680. |
What are covalant compound? |
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Answer» Covalant compound are formed by mutual sharing of electrons between two atoms of non- metals.Eg:-H^2 A covalent bond is formed between two non-metals that have similar electronegativities. Neither atom is "strong" enough to attract electrons from the other. For stabilization, they share their electrons from outer molecular orbit with others . Covalent bonding is a form of chemical bonding between two non metallic atoms which is characterized by the sharing of pairs of electrons between atoms and other covalent bonds.Example: Methane (CH4), Hydro Chloric acid (HCl) |
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| 49681. |
What is solenoid ? Draw the pattern of magnetic field line of |
| Answer» A coil of maby circualr turns of insulated copper wire wrapped closley in the djapr of cylinder this is called solenoid | |
| 49682. |
Function of glomerulus |
| Answer» It helps in filteration of impure blood and passes the urea , some glucose and water to tubule | |
| 49683. |
Give reason :- An element carbon forms a very large number of compounds |
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Answer» TetravalencyCatenation This is so because carbon has a property of:- 1catenation which allows it to form chains with other carbon atoms 2tetravalency ,it means it has valency of 4 which helps it to form covalent bonds with monovalent elemnts3small size,it helps it by giving it stablity in large compounds |
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| 49684. |
What is focal legth |
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Answer» The focal length of a lens is the distance between optical centre and principal focus of the lens. Distance between focus and pole |
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| 49685. |
What do u mean by coordination,?? |
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Answer» The working together of the various organs of an organism in a systematic manner due to which it produce response to the stimulus is called coordination Coordination means that any things which are mutually dicided then do the work . For eg a nerve coordinate with the brain |
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| 49686. |
Why we say SAVE TIGERS not Save Lions |
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Answer» Thanks <(sorry)> Tiger is killed by many people for making clathes ,switter etc so it said |
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| 49687. |
How types of etanol |
| Answer» <(Sorry)> | |
| 49688. |
Cbse marking scheme of 2019-2020 |
| Answer» Refer to the sample papers of science. | |
| 49689. |
Explain the mechanism of gaseous exchange between tissues and blood |
| Answer» when we take oxygen show the nasal cavity. then the oxygen goes to the alveoli that is sac like structure present in the lungs. Here by the process of diffusion exchange of gases between the blood and the alveoli takes place.Then the blood goes to the heart.And heart pumps that pure blood to the other part of the body or the targeted site.When the blood goes to the site or the tissues. Then again the process of diffusion takes place for the exchange of the gases (Oxygen and Carbon dioxide).In the blood there is high concentration of oxygen then the tissue. On other hand, in tissue there is high concentration of carbon dioxide than the blood. Hence by the diffusion the exchange of gases takes place.In the blood where high concentration of carbon dioxide present goes to the heart. Heart pumps the blood to the lungs for purification. This pathway continuous goes on. | |
| 49690. |
What will the possible isomers structure for 2,3 dimethylpentanol |
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| 49691. |
State the principal behind electric generator |
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Answer» Electromagnetic induction The electric generator works on the principle that when a conductor is moved in a magnetic field then the current is induced in the conductor or in other words electricity can be generated by rotating a coil inside magnetic field. Electric generator works on the principal of electromagnetic induction. |
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| 49692. |
What are estere ??¿¿ |
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Answer» Esters are sweet smelling compounds. They are formed by the reaction of a carboxylic acid with an alcohol in the presence of conc. sulphuric acid. For example, ethyl ethanoate is prepared by reacting ethanoic acid and ethanol in the presence of conc.sulphuric acid. Esters are usually volatile liquids having sweet smell or pleasant smell. |
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| 49693. |
Explain why copper wire cannot be used as a fuse wire? |
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Answer» Copper wire cannot be used as fuse wire because it is not high melting and boiling point A fuse is a thin wire made of a material which have low melting point so that it melts and breaks off the circuit if the current exceeds the safety limit. A copper wire cannot be used as a fuse wire because it has a high melting point. It will not melt easily when a high electric current passes through it and may damage the electrical appliances. |
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| 49694. |
State modern periodic law of classification of element |
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Answer» Properties of elements are a periodic function of their atomic number....... Modern periodic law states that “Properties of elements are a periodic function of their atomic number”.(i) There are 18 groups in the modern periodic table and(ii) 7 periods in the modern periodic table. |
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| 49695. |
Can commerce student become software engineer |
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Answer» No, not at all Na भाई.... He can only become CA OR IPS..... And etc |
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| 49696. |
Electron dot structure of ketonone |
| Answer» Can\'t be send here??? | |
| 49697. |
Does alluminium form hydroxide with reacting with water |
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Answer» No because as soon as it comes in the contact of air it reacts with oxygen in the air to form aluminium oxide It forms oxide when it reacts with water( in the gaseous state i.e steam) No it forms oxide |
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| 49698. |
How many hours food is stored in stomach |
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Answer» 6 hours in this time period the food is converted into a pre - digested form of chyme. 3 hours 2houts Approximately 3 hours. |
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| 49699. |
What is used for whitewash cao or ca(oh)2 |
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Answer» CaO is used Cso Ca(OH)2 is used for white wash. |
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| 49700. |
How to convert oil to ghee |
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Answer» Hydrogenation is the process of converting vegetable oil to vegetable ghee. During hydrogenation, vegetable oils are reacted with hydrogen gas at about 60°C. A nickel catalyst is used to speed up the reaction. The double bonds are converted to single bonds in the reaction. In this way, unsaturated fats can be made into saturated fats i.e. oil is converted into fats. By hydrogenation process... |
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