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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.
| 67651. |
Importants of periodic classigicatio |
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Answer» •It helps to study the property of elements.•The periodic table can be used to identify the matter already discovered by mankind. However, if new matter is discovered, then the atomic structure of the new matter can be compared to the elements in the table in order to classify the new material. •It describes the atomic properties of every known chemical element in a concise format, including the atomic number, atomic mass and relationships between the elements. Elements with similar chemical properties are arranged in columns in the periodic table. 1)it makes the study of vast number of elements easy2) it is aid to memory3)we can easily tell the properties of element by know it\'s position in periodic table |
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| 67652. |
What are insulators |
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Answer» An insulator is a non-conducting material that does not carry any charge. Examples of insulators are plastic and wood. Semi-conductors behave like insulators when they are cold, and like conductors when they are hot. The elements silicon and germanium are examples of semi-conductors. Substances which do not conduct electricity or do not allow it to pass current ⚡through them are known as insulators example-???? Any thing which do not conduct electricity is known as insulator.For example - Rubber,wood.etc |
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| 67653. |
Why forest is known as biodiversity hotspot. |
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Answer» As they have a variety of organosm Hot-spot is a place where the flora and fauna is present in high amount and in varied forms.As forest also contain a large varied amount of flora and fauna, that\'s why it is called the biodiversity Hot-spot. ☺️ Hotspot means an area full of biological diversities. Biodiversity is measured by the number of different lifeforms found in an area. In a forest various species are available which include bacteria, fungi, insects,birds,reptiles,and mammals. Forest ate therefore called biodiversity hotspot. |
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| 67654. |
Differentiate between eye and eyespots |
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Answer» An eyespot is a rudimentary organ which enables the organism to detect light (between daylight and darkness) whereas eye is a well-developed organ that enable us to get a clear image. Eyespots are seen in Planaria. Eye are complex structure made up of different tissues and cells whereas eye spots are merely dot-like structures which sense light. Eyes are the well developed organs that forms an image and enable us to see whereas eye spots are present just to distinguish between dy light and night timeThey are also called rudimentary organs.eg planaria has just 2 eye spots............... itna hi pta hai ? Please answer |
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| 67655. |
Example of Thermal decomposition reaction and electric decomposition |
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Answer» CaoH2...heat.................Cao+H2o Electric Decomposition- Ex- NaCl ----------- Na + Cl2 This reaction will be carried out by Electricity. Themal decomposition- Ex- KCLO3 -------- KCL + O2 This reaction will be carried out by heating. |
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| 67656. |
State two ways to prevent the rusting of iron |
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Answer» Anodising ,painting Galvanisation, painting, greasing Galvanisation,Greasing Galvanisation and painting Two ways to prevent the rusting of iron are:Oiling, greasing, or painting: By applying oil, grease, or paint, the surface becomes water proof and the moisture and oxygen present in the air cannot come into direct contact with iron. Hence, rusting is prevented.Galvanisation: An iron article is coated with a layer of zinc metal, which prevents the iron to come in contact with oxygen and moisture. Hence, rusting is prevented. |
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| 67657. |
Explain various trends in modern periodic table |
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Answer» The chemical element which arrange the atomic number And configuration the recurring chemical property .The 7 rows of the table is called periods Generally metal on the left or non-metel on the right okkkk Many trends like the position of noble gases were clearly and exactly defined,the were categorised on the basis of their increasing atomic number,property of element is periodic function of their atomic number called as periodic law was firstly authorised by henry mosely.,the position of metals,non metals and metalloids were clearly defined in periodic table. Various trends in the modern periodic table are: 1.Atomic radius trends on periodic table.2.Atomic and ionic radii.3.Mini-video on ion size.4.Ionization energy trends.5.Period trend for ionization energy.6.First and second ionization energy.7.Electron affinity: period trend.8.Electronegativity.? |
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| 67658. |
how micelles formed ?? |
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Answer» \xa0When soap is added to water, then the fatty acid ions aggregate to form spherical clustures which are called as micelles.\xa0They are forme during cleasing action of soap or detergent when they areused with water.The cleaning action of soap is due to micelle formation and emulsion formation. Inside water a unique orientation forms clusters of molecules in which the hydrophobic tails are in the interior of the cluster and the ionic ends on the surface of cluster. This results in the formation of micelle. OR hydrophillic, hydrophibic Micelles are lipids molecar that arrange themselves in a spherical form in a aquoes solution . The formation of micelles is a response to amphibitic nature of fatty acids By soap C17h35 |
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| 67659. |
what is the role of split ring in an electric motor |
| Answer» Electric motor is a device which converts the electrical energy into mechanical energy.In an electric motor the split ring commutator is used to reverse the direction of current in the coil. During the working of an electric motor whenever the coil passes from the vertical position, the direction of current through the coil has to be reversed, so that the coil continues to rotate in the same direction.Hence it reverses the direction of current in the coil after evry half rotation of the coil and thus the direction of couple rotating the coil remains unchanged and the coil continues to rotate in the same direction. | |
| 67660. |
Dot structure |
| Answer» Kon se compound ka | |
| 67661. |
Why mucus is present in our nostrils? |
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Answer» Mucus and hair present in the nostrils are parts of our body, which filter the air we breathe in, preventing the dust filled air to go in our lungs. As the air passes through the nasal passages, the mucus and hair provide heat and moisture. They also secreates the pigment which gives the mucus it\'s yellow colour mucus scraeted these glands Dissolves odour as the entire the nose The olfactory receptor mucus which enter the nasal passage OK thanx Mucus filter the air we breathe in, preventing the dust filled air to go in our lungs.......... Mucus present in our nostrils because of filtering the air |
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| 67662. |
Which machine is used to measure current accept ammeter? |
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Answer» Galvanometer is meansure the magnitude and direction of the current An ammeter (from Ampere Meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters. Galvanometer |
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| 67663. |
Which formula is used to calculate resistance if potential difference and power is given? |
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Answer» Power =( POTENTIAL DIFFERENCE) raised power 2 / RESISTANCE P = V square / R V=IR is used the resistor can be found it Resistance multiplying by the flowing of current OR the unit of PD is volt P=V*V/R |
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| 67664. |
Name two tissues that provide control and coordination in multi cellular animals? |
| Answer» 1)Nervous system 2)endocrine system | |
| 67665. |
Name two sets of nerves that constitute the peripheral nervous system? |
| Answer» 1)cranial nerves2)spinal nerves | |
| 67666. |
Why reactivity series is only of metals why not of non metals |
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Answer» because non metals are less reactive or totally unreactive non metal ka bhi hota hai but ham log ko platinum tak hi padhna hai .hydrogen non metal hi hai jo reactivity series me hai It\'s their choice. |
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| 67667. |
Can anyone tell me about excretion |
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Answer» Thanx The process of removal of harmfull metabollic waste from the body Thanks Thanku Harmful to the human body as they can be toxic To the body They are various organ to help in excreation to such Wasts the body They are kidney lungs skin Eyes etc.We know that blood transport food water and air to differents parts of the body |
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| 67668. |
Which metal oxide is used for printing black and white print on paper? |
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Answer» Yeah silver bromide Its silver bromide Don\'t know? |
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| 67669. |
What is periods?What if a male do reproduction with female during periods? |
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Answer» Nothing can happen when male met female during periods Priods is known as menstrual cycle in which the wall of andomererum break and realese throuch utrus with ovun Baby |
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| 67670. |
Diffrentiate between arteries, veins and capillaries. (3 mrks) |
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Answer» Arteries carry blood away from the heart to various organs of the body.Veins collect the blood from different organs and bring it back to the heart.Capillaries exchange of material between the blood and surrounding cells takes place across the thin walls of capillaries. Arteries - 1) Arteries are thicker than veins and cappilaries.2) They carry oxigenated blood except pulmonary artery.3) Valves are absent.Veins - 1)Veins are thin than artery but thick than capillary.2)They carry deoxgenated blood.3)Valves are present.Capillaries - 1)Capillaries are thinnest blood vessels.2)Capillaries carry oxygen and nutrients to the tissues.3)Valves are absent. |
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| 67671. |
Why we have two eyes for vision comparing not one ? |
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Answer» Because it gives us 3d vision also for judging distances more accurately We have two eyes for the most wider vision..... |
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| 67672. |
How to score 100 /100 in science |
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Answer» Bro, there is no specific \'mantra\' for scoring 100 on 100 in any subject.....every student is different and thus success mantras are different for everybody..........scoring well depends on the fact that whether your study schedule suits you or not..........so do what suits you the best All the bestt See if you are having any phobia of science so 4 hrs daily read science....so you will not had a phobia of science and by this you can score 100/100...Just read the chapters with full concentration and thoroughly... By studying |
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| 67673. |
how do plants excrets waste products |
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Answer» 1. CO2 and O2 is excreted from the stomata.2. Liquid waste is removed through transpiration3. Some waste is losted in the form of gums and resins4. Some waste is released in the soil by the roots. By transpiration,by leaf fall, by excreting waste as gum |
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| 67674. |
When fe react with oxygen then why fe3o4 is formed |
| Answer» Iron actually does not react with cold or hot water. It reacts with steam and gets oxidised to iron(II)(III)oxide i.e. FeO.Fe2O3.This is combinely written as Fe3O4. It is also named as ferrosoferric oxide.Actually no compound like Fe3O4 is formed. | |
| 67675. |
What are difference between mitosis and mitotic |
| Answer» MitosisThe process of cell division in which the chromosome number is remained same is known as mitosis.The daughter cell is exactly same as parent cell.Mitosis have one round of prophase, meta phase , anaphase and telophase\xa0MeiosisThe process in which the chromosome number becomes half in the cell is known as meiosisThe daughter cell is slightly different from parent cell.Meiosis have two rounds of prophase, meta phase , anaphase and telophase\xa0 | |
| 67676. |
How mehanoic acid form from methane |
| Answer» Methane is CH4Acid-COOHMethanoic acid Will be HCOOH | |
| 67677. |
State maxwell right hand thumb rule |
| Answer» According to Maxwell’s right hand thumb rule: Imagine that you are grasping the currentcarrying wire in your right hand so that your thumb points in the direction of current, then the direction in which your fingers encircle the wire will give the direction of magnetic field lines around the wire.Let AB be the straight wire carrying current in the vertically upward direction from A to B. To find out the direction of the magnetic field lines produced by this current, we imagine that we are grasping the current carrying wire in our right hand as shown in fig. so that our thumb points in the direction of current towards B. Now, the direction in which our fingers are folded gives the direction of magnetic field lines. In this case, the direction of magnetic field lines is in the anticlockwise direction. | |
| 67678. |
When does the snell\'s law fail |
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Answer» When it is perpendicular at normal Sin r/sin i At the point of total internal reflection.When the sin of the angle of reflection is greater than one.When light moves from a dense to a less dense medium, such as from water to air, Snell\'s law cannot be used to calculate the refracted angle when the resolved sine value is higher than 1. At this point, light is reflected in the incident medium, known as internal reflection. Before the ray totally internally reflects, the light refracts at the\xa0critical angle |
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| 67679. |
What is the reflection and refraction? |
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Answer» Reflection is bouncing back of lightButRefraction is bending back of light Bouncing back of light is called reflectionBending of light is called refraction The image that you seen in mirror in water or shiny surface is called reflection a change of direction that light undergoes when it enter in a medium in different density from the one through which it hasbeen travelling is called refraction. Reflection- The bouncing back of light as it fall on smooth surface.Refraction- The bending of the ray of light as it passes from one medium to the another. |
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| 67680. |
What is scum ? |
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Answer» Hard water contain ions of magnesium and calcium reacts with soap to form insoluble precipitates called as scum.....? Soap scum or lime soap is the white solid composed of calcium stearate, magnesium stearate, and similar insoluble compounds that results from the addition of soap and other anionic surfactants to hard water. Hard water contains calcium and magnesium ions, which react with the surfactant anion to give metallic or lime soaps:2 C17H35COO−Na+ + Ca2+ → (C17H35COO)2Ca + 2 Na+In this reaction, the sodium cation in soap is replaced by calcium to form calcium stearate.Lime soaps build deposits on fibres, washing machines, and sinks. Synthetic surfactants are less susceptible to the effects of hard water. Most detergents contain builders that prevent the formation of lime soaps. |
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| 67681. |
What is evolution???????? |
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| 67682. |
Qualified for NTSE? |
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Answer» Yup!!!!! Yes |
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| 67683. |
What is the bond structure of cyclopropane,propeneand propyene |
| Answer» Cyclopropane C // \\\\ C = C | |
| 67684. |
Pickles and curd not stored in copper utencils why |
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Answer» As they produce hydrogen gasWe know that metals when react with acids producs hydrogen gasSince pickles and curd contains acetic and lactic acid respectively therefore they produces hydrogen of which consumption is very harmful..... Because curd & pinkles are acidic in nature & copper is metallic that why it react with it to release some toxic substances that harmful for us |
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| 67685. |
Diffrence between reduse and repurpose? |
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| 67686. |
Whats the function of seminal vesicles |
| Answer» \tSeminal vesicles , prostate gland and Cowper\'s gland are the accessory glands in the male reproductive system in human beings.\tThe function of SEMINAL VESICLES is to store sperms and to secrete seminal fluid that makes the sperm active.\xa0 | |
| 67687. |
In heredity and evolution how many question are come and how mark from this chapter |
| Answer» In heridity chapterMonohybrid and dihybrid cross is v.v.v imp .You should do this thoroughlyAnd one que that how mendleev showed that dominant traits and recessive are independentOkI hope u got ur answer.....? | |
| 67688. |
What is meant by sustainable management ?why is reuse considered as better than recycling |
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Answer» Sustainable development encourages forms of growth that meets current basic human needs while preserving the resource for the future generations. Reuse is better than recycle because in recycle we uses some energy but in reuse we simply use things again and again. Sustainable Management: It is a pattern of management that promises the use of natural resources in such a way that they meet the human needs in the present as well as in the future.Advantage of Reuse over RecyclingRecycling requires a large amount of energy and money. Reuse, on the other hand, simply involves using things, again and again, preserves the embodied energy originally used in manufacturing an item. Reuse also creates less air and water pollution than recycling. Hence, reuse is preferred over recycling. Economic development is conducted without depletion of natural resources is called sustainable development . |
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| 67689. |
Give the chemical test to distinguish between the saturated and unsaturated hydrocarbon |
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Answer» A chemical test to distinguish between saturated and unsaturated hydrocarbon.Bromine water test - Unsaturated hydrocarbon gives addition reaction with Br2. So the colour of Br2-water gets decolourized.R-C=C=R + Br2\xa0--> R-BrC-CBr-Rwhereas,Saturated hydrocarbons do not react with Br2-water so the colour of Br2\xa0-water does not get decolourised. Can someone plz tell me about that bromine water test...I just got confused. ... Bromine test Saturated hydrocarbon burns with blue flame in sufficient oxygen.But unsaturated hydrocarbon burns with yellow smoky flame. Bromine water test |
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| 67690. |
Name the unit of (a)electrical resistance (b)restivity |
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Answer» (a)ohm(b)ohm meter (a) ohm (b) ohm meter (b) ohm metre. (a) ohm a) ohmb) ohm |
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| 67691. |
Function of oxitocin |
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| 67692. |
What is heridity from bio |
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Answer» It is part of chapter heredity and evolution The process of inheritance of traits from parents to progeny is called heredity. |
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| 67693. |
Largest cell present in our human body? |
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Answer» Nueron Ovum in females... It is 1000 micrometer in diameter Neuron Circulation of water on the earth water cycle Ova in females |
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| 67694. |
What did galileo invented |
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Answer» Telescope... May be He invented galileo\'s microscope.... |
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| 67695. |
Circulation of water on the earth water cycle |
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Answer» From water -evaporation -condensation - precipitation -percolation Water-water vapour-cloud-condensing of water-rain |
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| 67696. |
State any two methods of artificial vegetative propagation with examples....... |
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Answer» Layering,cutting and crafting. Layering kabata do yre. Grafting in apple and layering in grapes. |
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| 67697. |
What is the weightage of each chapter in science for 2019 board exam? |
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Answer» How to provide here..???? Yu can get it frm google... |
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| 67698. |
Why do we apply oil on iron hook kept in storage |
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Answer» To stop the action of air and moisture on iron ... To prevent it from getting corroded by atmospheric components.......... So as to prevent it frm rusting To prevent them from rusting To prevent it from rusting |
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| 67699. |
What were the drawbacks of Newland\'s law of octaves? |
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Answer» Thanks to both of you. 1. It was not applicable throughout the arrangement. It was applicable up to calcium only. The properties of the element listed after calcium showed no resemblance to the properties of the element above them................. 2.According to Newland, only 56 elements exist in nature, but after discovery there were more than 56 element............... 3.The position of cobalt and nickel in the group of the elements (F, CL) of different properties could not be explained............. 4. Placing of iron far away from cobalt and nickel, which have similar properties as iron, could also not be explained. Drawbacks of Newlands octave rules are (1).Newlands law was applicable to the classification of elements upto calcium only(2).Newland assumed that only 56 elements exist in nature and no more elements would be discovered in future(3).In order to fit elements into his tables,newland put even 2 elemnts together in one slot.Tanmay more! |
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| 67700. |
What happened when light ray incident perpendicular on a mirror and why ? |
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Answer» Ray will retrace its path as the angle of incidence becomes equal to the angle made by normal Light ray will retrace its path.Because angle of incident equal to angle of reflection It will retrace the path |
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