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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your Class 11 knowledge and support exam preparation. Choose a topic below to get started.
| 1201. |
Differentiate between adhesive and cohesive force. |
| Answer» Thanq so.....much priya....???<br>Eg for adhesive force- there is large force between paper molecules and gum molecules. Adhesive force is between different molecules force and cohesive is exerted my same two molecules to each other<br>Aman can u give me best example.....<br>Adhesive force is a type of force that acts between the particles of different substances......Cohesive force is a type of force that acts between same type of particles....<br>adhesive force:- force of attraction acting b/w the molecules of different substances.cohesive force:- force of attraction amongst the molecules of the same substance. | |
| 1202. |
Difference between periodic motion and the oscillation motion??? |
| Answer» In the periodic motion body motion repeats after a definite ti.e if interval but in a oscillatory motion body moves back and forth repeatedly after a definite time of interval<br>Periodic Motion ➡️ A motion which repeat itself over nd over again after a regular interval of time. On the other hand.. Oscillation motion ➡️A motion in which body moves back nd fourth repeatedly about a fixed point. | |
| 1203. |
Why take the value for density of water at 4°C |
| Answer» 1gram per cubic centimeter | |
| 1204. |
What is origin of intermolecular force |
| Answer» Mujhe to nahi lagta yakshi<br>Well.....are u alright!!??????????<br>Laufjgmxlurayrojfaikdnvzuprtfffffffgggggyyytreddfggjjts nyssqdghk | |
| 1205. |
State and prove work energy thorm |
| Answer» The work-energy theorem states that the work done by all forces acting on a particle equals the change in the particle\'s kinetic energy.Now for infinitesimal displacement calculations and forces whether variable or constant, we can write from the definition of work,dW=FdxNow let the total work done is W, and the displacement is fromx0toxIntegrating the both sides we get,∫0WdW=∫x0xFdxW=∫x0xFdxW=m∫x0xdvdtdxW=m∫v0vvdvW=12mv2−12mv20W=ΔEk(Proved)Hence this will help u | |
| 1206. |
All important derivations of class 12 |
| Answer» ???<br>I think so that its mars<br>Kaun si duniya mai hai aap?????yeh 2019 chal raha hai......aap earth pr hai..........pta hai??????????<br>Its 11 ??<br>it\'s 11th ???<br>class 12 ka derivations ? ?? | |
| 1207. |
All log rules and define |
| Answer» | |
| 1208. |
Bernouli principle |
| Answer» \tFor a streamline fluid flow, the sum of the pressure (P), the kinetic energy per unit volume (ρv2/2) and the potential energy per unit volume (ρgh) remain constant.\tMathematically:- P+ ρv2/2 + ρgh = constant\twhere P= pressure ,E./ Volume=1/2mv2/V = 1/2v2(m/V) = 1/2ρv2E./Volume = mgh/V = (m/V)gh = ρgh\t\t | |
| 1209. |
Can you provide lab manual of class 11 of lens |
| Answer» ????<br>Here ???????<br>Here???????¿... | |
| 1210. |
Derive the projectile motion?? |
| Answer» Let a projectile be thrown up with a velocity u at angle angle w. Velocity of projectile along the horizontal is u∗cos(w) and velocity along the vertical is u∗sin(w).During the motion of the projectile there is no force acting in the horizontal direction. There is only the force of gravity acting in the vertically downward direction. So horizontal component of velocity remains same. Only the vertical component changes. Also the net displacement of the particle is 0.s=ut+(gt2)/2We use this equation in the vector form0=u∗sin(w)∗t−(gt2)/2Solving this you get t=2u∗sin(w)/gThis is the time of flight of the projectile.During this time the horizontal range covered is R=u∗cos(w)∗2u∗sin(w)/gSimplifying this you get R=(u2)∗sin(2w)/gAt the highest point of the projectile the vertical component of the velocity becomes 0.So now we use the formula v2=u2−2as0=(u∗sin(w))2−2ghSolving this you get h=((u∗sin(w))2)/2gHope that was useful. | |
| 1211. |
what should be the the nature of specific heat of the cooleant |
| Answer» | |
| 1212. |
What is newton second law of motion?? |
| Answer» The rate of change of momentum of a body is proportional to the applied force and takes place in the direction in which the force acts. i. e, F=ma. | |
| 1213. |
I am not able to understand new second law of motion |
| Answer» | |
| 1214. |
What is an ideal fluid?? |
| Answer» Yah...ideal fluid is non-viscous and incompressible..<br>An ideal fluid is non- viscous, incompressible and its flow is steady and irrotational<br>A non-viscous fluid is an ideal fluid... There is nothing ideal ...<br>Can u explain it??<br>Is it right??<br>A fluid which follows ideal gas and fluid laws is called ideal fluid. | |
| 1215. |
Is ray optics is included in the syllabua |
| Answer» It is excluded from 12th and included in 11th<br>From this year<br>from this year or last year<br>Yes | |
| 1216. |
VVI.derivation for the lesson thermodynamics and kinetic theory of gases. |
| Answer» Sahi bat boli Apne<br>Haan ye toh sahi bola<br>soo all ncert content is important<br>VVI. ki ni ho ri,,, all are important as it is 11th Jo lgta hai nhi ayega vhi definitely aata hai. | |
| 1217. |
What is critical angel?? |
| Answer» the critical angle is defined as the angle of incidence that provides an angle of refraction of 90-degrees. Make particular note that the critical angle is an angle of incidence value. For the water-air boundary, the critical angle is 48.6-degrees. Hope this will help u ??? | |
| 1218. |
Define Third law of time period and derive ? |
| Answer» Hope this will help u<br>Kepler’s 3rd Law of Periods:This law is known as the law of Periods. The square of the time period of the planet is directly proportional to the cube of the semimajor axis of its orbit.T² ∝ a³That means the time ‘ t ‘ is directly proportional to the cube of the major axis. Let us derive the equation of Kepler’s 3rd law. Let us suppose,m = mass of the planetM = mass of the Sunv = velocity in the orbitSo, there has to be a force of gravitation between the Sun and the planet.F = GmMr²Since it is moving in an elliptical orbit, there has to be a centripetal force.Fc = mv²r²Now, F = Fc⇒ GMr = v²Also, v = circumferencetime = 2πrtCombining the above equations, we get⇒ GMr = 4π²r²T²T² = 4π2r3)GM⇒ T² ∝ r³ | |
| 1219. |
Applications of TIR |
| Answer» It is widely used in optical fibre, production of diamond,<br>naa bhai simple answer hai... ? ? ? by the way thanks ?. ?<br>Nice answer darshana<br>TIR is widely used in the brilliance of diamond, mirage, glass prism and optical fibre.<br>Ray optics ka question hai kya | |
| 1220. |
What is the mean for a perfectly rigid body |
| Answer» A perfectly rigid body means no matter how much load you apply it is neither going to deform nor any shape change. The high school kinematics and dynamics we study inherently assumes that body is perfectly rigid and no amount of force is going to change its shape. | |
| 1221. |
Why molar specific heat at const. Pressure is greater than molar specific heat at const.volume? |
| Answer» Well the case is simple molar specific heat is amount of heat required to raise the temp of a substance 1mole to 1 celcius so at constant volume particles have no more space to move around so their kinetic energy increases hence increase in temp would be like temp of kinetic energy of particles due to not expanding + heat given. but in case of constant pressure volume will increase causing cooling effect which also needs to be neutralized by heat so total temp would be like heat given to neutralize cooling effect of expanding + heat to rise temp to 1 celcius hence this molar specific heat is greater clearly | |
| 1222. |
Will ray optics comes in board examination of 12th class or not? |
| Answer» No it will not come<br>No it will not come<br>No, it will not<br>Hello dipanshu.....kya tum mujhey jaantey ho????????<br>Of course not | |
| 1223. |
Who proposed the heliocentric model of planetary system what was the proposition |
| Answer» Copernicus(1473-1543) put forward the \'Heliocentric\' theory which states that:"The sun is at the centre of planetary system". | |
| 1224. |
What is law of equipartition of energy? |
| Answer» | |
| 1225. |
Explain regelation? |
| Answer» The phenomenon in which ice melts when pressure is increased and again freezes when pressure is removed is called regelation (re=again ; gelare = freeze) . | |
| 1226. |
What is the time period of second pendulum ? |
| Answer» It is precisely 2 seconds 1 second for swing in one direction and 1 second for return swing..a frequency of 1/2 Hz | |
| 1227. |
Define orbital velocity of satelite |
| Answer» Orbital Velocity of a satellite is the minimum velocity it has to maintain to continue its circular motion in its orbit. We know for a circular motion to continue, a force called centripetal force is required to work upon the object in circular motion. And this force is a real and acts towards the centre of the circle. As this is a real force it’s to be supplied by a real mechanism or system. A satellite moves in a circular track and the centripetal force acting on it is supplied by the gravitational force acting between the earth and the satellite. | |
| 1228. |
Define static equillibrium |
| Answer» \xa0Static equilibrium: This is the type of equilibrium in which the resultant of all the forces acting on the body is zero, i.e. the net acceleration of the body is zero, and the velocity of body is also zero. It means that the body is at rest. So if a body is at rest and the net acceleration of it is zero, it means the body is in static equilibrium. | |
| 1229. |
Triple point of water |
| Answer» O. O1c, it is a temperature at which all the three phases that is solid, liquid, gas co-exists<br>The temperature and pressure at which a substance can exist in equilibrium state in solid liquid and gas.triple point of water is 273.16k 0.01°C or 32.5°F.. | |
| 1230. |
What is degree of freedom.explain it? |
| Answer» It is the minimum number of possibilities of the motion of the molecules. It value depends on the atomicity of the molecules.<br>A degree of freedom of a physical system is an independent parameter that is necessary to characterize the state of a physical system. In general, a degree of freedom may be any useful property that is not dependent on other variables.<br>The number of degrees of freedom of a dynamical system is defined as the total number of co-ordinates or independent variables required to describe the position and configuration of the system.Degrees of Freedom can be defined as independent displacements or rotations that specify the orientation of a body or system.<br>The degree of freedom refer to the maximum possible independent motion of the gas molecules. [Independent motion refer to translational,rotational,as well as vibrational motion. | |
| 1231. |
Define escape velocity |
| Answer» The minimum velocity at which a body is projected from the surface of earth which goes outside the gravitational field of earth...is called escape velocity...<br>the lowest velocity which a body must have in order to escape the gravitational attraction of a particular planet or other object. | |
| 1232. |
Postulates of kinetic theory of gases?? |
| Answer» Thank you ??? but i forgot to mention the points sorry<br>Very well....???<br>The following assumptions are made in developing Kinetic theory of gases. We will show that the Kinetic theory of gases developed with these assumptions explain the macroscopic properties of the materials.All gases consist of some basic units called molecules. The molecules are made up of single or group of atoms depending on the chemical nature of the gas. The molecules move in random direction with random speed. The molecules undergo collisions among themselves and to the walls of the container. These collisions are perfectly elastic. The collision time is very small compared to the average time spent by a molecule between two collisions. The size of the molecule is very small compared to the average intermolecular distance. Molecules do not exert any force among themselves or to the walls except during collision. The molecules obey Newton\'s Law of Motion. The number of gas molecules is so large that at every position of infinitesimal volume of the container, the density and distribution of different physical parameters are same. The above parameters are also independent of direction and time at a steady state.<br>Any four?? | |
| 1233. |
Project are projectile motion |
| Answer» ???<br>???<br>Means???? What u want to ask | |
| 1234. |
At what temperature the speed of sound in air will e 1.5 times its value at 27 degree C in air |
| Answer» | |
| 1235. |
Prove barnollise equation |
| Answer» | |
| 1236. |
What is angle of repose? How is it related to coefficient of maximum static friction? |
| Answer» The internal angle between the surface of the pile and the horizontal surface is known as the angle of repose and is related to the density, surface area and shapes of the particles, and the coefficient of friction of the material. Material with a low angle of repose forms flatter piles than material with a high angle of repose.The term has a related usage in mechanics, where it refers to the maximum angle at which an object can rest on an inclined plane without sliding down. This angle is equal to the arctangent of the coefficient of static friction μs between the surfaces. | |
| 1237. |
What is par sec |
| Answer» The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System. A parsec is defined as the distance at which one astronomical unit subtends an angle of one arcsecond, which corresponds to648000π astronomical units.One parsec is defined as the distance at which an arc of length one astronomical unit subtends an angle of one second of an arc .1 parsec = 3.08 x 1016m. | |
| 1238. |
some important topics in chapter 11 12 nd 13... |
| Answer» thnx to all..<br>Chapter 13 – Kinetic TheoryImportant Topics:1. Behaviour of Gases2. Law of Equipartition Energy3. Mean Free Path4. Specific Heat capacity<br>Chapter 12 – ThermodynamicsImportant Topics:1. Zeroth Law of Thermodynamics2. First Law of Thermodynamics3. Heat Engines4. Second Law of Thermodynamics5. Carnot Engine<br>Chapter 11 – Thermal Properties of MatterImportant Topics:1. Ideal Gas Equation2. Thermal Expansion3. Specific Heat Capacity4. Calorimetry5. Latent Heat6. Heat Transfer7. Newton’s Law of Cooling | |
| 1239. |
Why are some insects able to walk on water? |
| Answer» Few spiders,bugs.... more than 1200 species can walk in water<br>The surface of any body of water behaves as though it is covered with an invisible skin, which allows small, light-weight insects to walk across it. This skin effect is caused by surface tension.<br>Oooo...really for example?? | |
| 1240. |
Displacement current |
| Answer» Answer:In electromagnetism, displacement current is a quantity that is defined in terms of the rate of change of electric displacement field. it is not an electric current of moving charges, but a time-varying electric field. | |
| 1241. |
Unit wise distribution |
| Answer» | |
| 1242. |
Procedures of vector addition |
| Answer» | |
| 1243. |
Define relative error nd its derivation |
| Answer» | |
| 1244. |
What is Tention? |
| Answer» Tension is a force related to the stretching of an object (the opposite of compression) . | |
| 1245. |
Where I found all derivation of gravitation |
| Answer» Sl arora<br>HC verma is also good<br>Sl arora is a good book<br>yes sl arora is good book<br>S.l arora reference book is good for it | |
| 1246. |
What is the dimension of a physical quantity corresponding to calorie. |
| Answer» Good ?<br>How are u bro<br>Hi Aman<br>???<br>???<br>dekh ker copy paste kerna hota hai,,, Hindi translation bhe copy ho gyi... ?<br>what is the dimension of a physical quantity corresponding to calorieResults in Englishकैलोरी के लिए इसी एक भौतिक मात्रा के आयाम क्या हैहिन्दी में नतीजेIn a popular use of the term calorie, dietitians loosely use it to mean the kilocalorie, sometimes called the kilogram calorie, or large Calorie (equal to 1,000 calories), in measuring the calorific, heating, or metabolizing value of foods. | |
| 1247. |
a spinning cricket ball in air does not follow a parabolic trajectory.explain why |
| Answer» Nice question also ✌✌?<br>Well explined priya ?????<br>spinning cricket ball in air does not follow a parabolic trajectory. ... This decreases the velocity of air flowing below the ball. Hence, the pressure on the upper side of the ball becomes lesser than that on the lower side. Hence curved path is followed<br>The velocity of the air below the ball is decreased because these two motions are opposing each other. Thus, the pressure on the upper side of the ball is lesser and there is an upward force that works upon the ball. This makes the ball follow a curved path and not a parabolic trajectory. | |
| 1248. |
Expression for traingle law of vector addition |
| Answer» thnx to all ji..for ur answers<br>thnx dear<br>if 2 vectors can be represented both in magnitude and direction by the 2 side of ⛛ taken in the same oder, then their resultant is represented completely, both in magnitude and direction, by the 3rd side of the ⛛ taken in the opposite oder.<br>Statement of Triangle LawIf 2 vectors acting simultaneously on a body are represented both in magnitude and direction by 2 sides of a triangle taken in an order then the resultant(both magnitude and direction) of these vectors is given by 3rd side of that triangle taken in opposite order.Derivation of the lawConsider two vectors P and Q acting on a body and represented both in magnitude and direction by sides OA and AB respectively of a triangle OAB. Let θ be the angle between P and Q. Let R be the resultant of vectors P and Q. Then, according to triangle law of vector addition, side OB represents the resultant of P and Q. | |
| 1249. |
What is the cause of excess pressure inside a soap bubble? |
| Answer» Beause higher pressure than the local atmosphere is required to make the bubble in the first place! This requirement comes from the need to counterbalance the surface tension | |
| 1250. |
Derive an expression for excessive pressure in a soap bubble |
| Answer» Due to excess pressure inside the liquid drop, the free surface of the drop will experience the net force in the outward direction due to which the drop expands. | |