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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.
| 4451. |
State and prove bernouli\'s theorem |
| Answer» Bernoulli’s Principle\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\tDerive: Bernoulli’s equationAssumptions:\tFluid flow through a pipe of varying width.\tPipe is located at changing heights.\tFluid is incompressible.\tFlow is laminar.\tNo energy is lost due to friction:applicable only to non-viscous fluids.\tMathematically: -\tConsider the fluid initially lying between B and D. In an infinitesimal timeinterval Δt, this fluid would have moved.\tSuppose v1= speed at B and v2= speedat D, initial distance moved by fluid from to C=v1Δt.In the same interval Δtfluid distance moved by D to E = v2Δt.P1= Pressureat A1, P2=Pressure at A2.Work done on the fluid atleft end (BC) W1 = P1A1(v1Δt).Work done by the fluid at the other end (DE)W2 = P2A2(v2Δt)\t\t\tNet work done on the fluid is W1 – W2 = (P1A1v1Δt− P2A2v2Δt)\tBy the Equation of continuity Av=constant.\tP1A1 v1Δt - P2A2v2Δt where A1v1Δt =P1ΔV and A2v2Δt = P2ΔV.\t\t\tTherefore Work done = (P1− P2) ΔVequation (a)\tPart of this work goes in changing Kinetic energy, ΔK = (½)m (v22 – v12) and part in gravitational potential energy,ΔU =mg (h2 − h1).\t\t\tThe total change in energy ΔE= ΔK +ΔU = (½) m (v22 – v12) + mg (h2 − h1). (i)\tDensity of the fluid ρ =m/V or m=ρV\tTherefore in small interval of time Δt, small change in mass Δm\tΔm=ρΔV (ii)\t\t\tPutting the value from equation (ii) to (i)\tΔE = 1/2 ρΔV (v22 – v12) + ρgΔV (h2 − h1) equation(b)\tBy using work-energy theorem: W = ΔE\tFrom (a) and (b)(P1-P2) ΔV =(1/2) ρΔV (v22 – v12) + ρgΔV (h2 − h1)P1-P2 = 1/2ρv22 - 1/2ρv12+ρgh2 -ρgh1(By cancelling ΔV from both the sides).\t\t\tAfter rearranging we get,P1 + (1/2) ρ v12 + ρg h1 = (1/2) ρ v22 + ρg h2\tP+(1/2) ρv2+ρg h = constant.\tThis is the Bernoulli’s equation. | |
| 4452. |
What is full form of physivs |
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| 4453. |
derivation on banking of road |
| Answer» Check ncret thier is separate topic in box | |
| 4454. |
Define scientific method |
| Answer» The Scientific method is a process with the help of which scientists try to investigate, verify or construct an accurate and reliable version of any natural phenomena. They are done by creating an objective framework for the purpose of scientific inquiry and analyzing the results scientifically to come to a conclusion which either supports or contradicts the observation made at the beginning. | |
| 4455. |
Bending of cyclist |
| Answer» In order to take a safe turn, the cyclist has to bend a little from his vertical position. In this case, a component of the reaction provides the required centripetal force.If q is angle made by the cyclist with the vertical thenIn actual practice, the value of q is slightly less because the force of friction also contributes towards the centripetal force. | |
| 4456. |
What is Mayer\'s formula |
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Answer» It\'s simple relation between cp cv and R Cp-cv=r is mayors formula When Hydrogen and nitrogen react with each other to form ammonia. This process called mayers formula The difference between the specific heat of a gas at constant pressure( cp ) and its specific heat at constant( cv ) volume is equal to the universal gas constant(R) divided by the molecular weight(M) of the gas. i.e. cp−cv = R/M .This relation is known as Mayer\'s formula |
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| 4457. |
What RMS speed ? |
| Answer» The r.m.s. speed of the molecules of a gas is defined as the square root of the mean of the squared velocities of the molecules of a gas. No, r.m,s. speed is different from the average speed. | |
| 4458. |
Drive an expression for pressure exerted by a soap bubble. |
| Answer» The expression is 4s/R | |
| 4459. |
Define heat engine |
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| 4460. |
What is strain and stress |
| Answer» The internal restoring force acting per unit area of a body is called stress..... The change in configuration to original configuration is called strain | |
| 4461. |
what are the important questions of physics to pass in final exam |
| Answer» Visit @ https://www.youtube.com/channel/UCxdF11QbKfQUYXAF2qca-jA.Where i will upload soon | |
| 4462. |
Important uses of satellite |
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Answer» Thanx ma\'am \tthey can be used to make star maps\tthey can be used to study mysterious phenomena such as black holes and quasars\tthey can be used to take pictures of the planets in the solar system\tthey can be used to make maps of different planetary surfaces |
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| 4463. |
What are zeroth Law explain |
| Answer» Zeroth Law of Thermodynamics\tZeroth law of thermodynamics states that when two systems are in thermal equilibrium through a third system separately then they are in thermal equilibrium with each other also.\tForeg: - Consider two systems A and B which are separated by an adiabatic wall. Heat flow happens between systems A and C, and between B and C, due to which all 3 systems attain thermal equilibrium.\t\t\tZeroth Law of Thermodynamics suggested that there should be some physical quantity which should have same value for the system to be in thermal equilibrium.\tThis physical quantity which determines whether system is in equilibrium or not is Temperature.\tTemperature is the quantity which determines whether the system is in thermal equilibrium with the neighbouring system.\tWhen the temperature becomes equal then the flow of heat stops. | |
| 4464. |
2018 cbse final question paper |
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| 4465. |
Effect of altitude |
| Answer» Acceleration due to gravity decreases with increase in height or altitude or we can say \'g\' is inversely proportional to altitude. Percentage of decrease is 2h/R ×100 where h is height upto which object is taken and R is radius of earth. | |
| 4466. |
Express Newton\'s law of cooling mathematically |
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| 4467. |
Expression for the orbital velocity |
| Answer» V=√2Gm/R+h | |
| 4468. |
What is the importance of thermodynamic ? |
| Answer» It is related to heat and energy | |
| 4469. |
Why we read about thermodynamics in physics |
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| 4470. |
Why rain drops are spherical in shape? |
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Answer» Because the surface area of sphere is lowest with largest volume Due to its surface tention. Nooo |
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| 4471. |
define Pascal\'s law |
| Answer» It states that the object will exerted by same pressure by a viscous liquid if all the particles are supposed to be at same height | |
| 4472. |
how to solve the problem of oscillation and waves |
| Answer» Google it | |
| 4473. |
Explain banking of roads & bending of cyclists |
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Answer» Hii babe Uuuummmmaaaaahhhhhhhhhhhhhh.......????????????????????????????? I love you......meri aadat.... ????????????????????????????????? Chl bbyeee...kl baat krte h... Ohh....koi baat nhi...aaj tera mn na h toh mai ke kr sku hu Chhore....maan ja yrr...aaja re... Oh Vansh....plzzz....yaar....haath jodu hu....aaja onln....plzz....plzz....plzz...plzz...plzzz...plzz Le* Lagta h dar tu chhod ne jae....jae toh jaanu saang ke jae... Aree chhore....ke dikt se....aaja ne... Aana ho aaja....na mai sou hu....bbyee Ya aachi baat na h......ek toh late aavega...fer...jldi ae nu kh dega ki kl ye h kl vo h....fer offln hojaga....??????? Hppppp......mt aa....krle aapne mn ki....?????? Oye chhore....aaja ne.....kyu tadpave h.... ????....aaja aab....kyu gussa dilave h.....aapni nind chhod ke terete baat krn ne onln aai...ibb tu aata ae na... Solly....mei jaan.....aagar gussa h toh....kindly ignore it if u r not angry with me... Kya hua....??? Lvu uh too....mere rassgulle Uuuummmmaaaaahhhhhhhhhhhhhh....????? ??????? ye tere liye....?? Same to u.....mere gabru... Love u Ummaahhhh Happy rose ????day aayushi |
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| 4474. |
What\'s the formula of tangential acceleration |
| Answer» The rate of change of tangential velocity of a particle in a circular orbit is known as Tangential acceleration. It directs towards tangent to the path of the body.Tangential Acceleration Formula\tat=Δv/Δt\tTangential Acceleration Formula In Terms Of Distance\tat=d2s/dt2 Or at=v.dv/ds\t\tat is the tangential acceleration\tΔv is the change in the angular velocity\tΔt is the change in time\tv is the linear velocity\ts is the distance covered\tt is teh time taken | |
| 4475. |
How to derive the formula of centripetal acceleration???? |
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| 4476. |
What\'s the difference between centripetal and centrifugal acceleration?????? |
| Answer» Centripetal acceleration is towards the centre.....nd centrifugal acceleration is away form the centre...centripetal is inward....centrifugal is outward.. | |
| 4477. |
How does carnot cycle operater |
| Answer» A Carnot cycle is defined as an ideal reversible closed thermodynamic cycle in which there are four successive operations involved and they are isothermal expansion, adiabatic expansion, isothermal compression, and adiabatic compression. During these operations, the expansion and compression of substance can be done up to desired point and back to initial state. | |
| 4478. |
Define carnote engine and their working |
| Answer» It is a heat engine which converts heat energy into meachnical energy is known as CARNOT Engine | |
| 4479. |
What is blue print of physics in 2019 20 |
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| 4480. |
How to make investigation file |
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| 4481. |
What is law of flotation |
| Answer» It states that a body will float in a liquid if weight of the liquid displaced by the immersed part of the body is equal or greater than the weight of the body. | |
| 4482. |
What is degree of freedom??.. |
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Answer» \tDegrees of Freedom can be defined as independent displacements or rotations that specify the orientation of a body or system.\tA molecule free to move in space needs three coordinates to specify its location.\tIf it is constrained to move in a plane it needs to.\tIf constrained to move along a line, it needs just one coordinate to locate it.\tFor example:-Consider a room and if we tie a thick rope from one wall to another.Take a ball which is moving straight on the rope.The ball has only 1 degree of freedom. It can move only in one particular dimension. Consider if the ball is on the floor which is two-dimensional, then the ball can move along 2 directions.The ball has 2 degree of freedoms. Consider if we throw the ball in space which is 3 dimensional. Then the ball can move in 3 dimensions.Therefore degree of freedom tells us in how many ways a body can move or rotate or vibrate.\t\t Just remember the values Number of ways in which molecule can store energy |
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| 4483. |
What is themostat? |
| Answer» Thermostat is a device which is used to maintain a desired temperature in a system like refrigerator, air-conditioner, iron and in a number of devices. PRINCIPLE. Thermostat works on the principle of thermal expansion of solid materials. | |
| 4484. |
If a aeroplane will take 100 member than what will happen |
| Answer» Then it charges for only 100 members ......And the wondering thing is that all reach airpot safely | |
| 4485. |
A uniform steel bar if mass 5 kg and length 1.5 m |
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| 4486. |
Why pillars with disturbed ends are used instead of round pillars |
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| 4487. |
write the dimencial impulses of the name physical quantit havin same dimension |
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| 4488. |
prove thatMV^2/R+h=GMm/(r+h)^2 |
| Answer» F=mv^2/R+h. _eq.1. (Centripital force)F=GMm/(R+h)^2. _eq.2From eq 1 and 2Mv^2/r+h=GMm/(r+h)^2I hope it is understandible | |
| 4489. |
Example of latent heat . |
| Answer» Eg of latent heat of fusion: Ice changes to water, eg of latent heat of vapourisation : water changes into water vapour, eg of latent heat of sublimation is sublimation of naphthalene. | |
| 4490. |
Application of viscosity? |
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| 4491. |
what is use of projectile |
| Answer» For throwing any object from any vertical or horizontal distance | |
| 4492. |
What is the meaning of Kesquare divided by Gmrsquare |
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| 4493. |
how banking of road can be sloved? |
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Answer» Look it in physics pradeep With pen paper & mind |
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| 4494. |
Explain 3 newton law from calculas method |
| Answer» First law of newtona=dv/dtadt=dvDifferenciating both sidea[t]^t1-t2=[v]^v-ua[t-0]=[v-u]at=v-uV=u+atSecond law of newton v=dx/dt. [v=u+at]u+at=dx/dtudt+atdt=dxDifferenciating both sideu[t]^t-0+a[t^2]^t-0=[x]^x-0u[t-0]+a[t^2-0/2]=[x-0]ut+1/2at^2=x. Wherex=displacementx=ut+1/2at^2 | |
| 4495. |
13.7 |
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| 4496. |
How igeta final year paper 2016-17 with answers |
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| 4497. |
On an average the human heart is found to beat 75 times in minute . Calculate its frequency |
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| 4498. |
What is projectile motion?? |
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Answer» tanxx prince. Hope it is helpful Projectile motion is a form of motion experienced by an object or particle your that is projected near the Earth\'s surface and moves along a curved path under the action of gravity only. This curved path was shown by Galileo to be a parabola. |
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| 4499. |
Types of the waves |
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Answer» Two types of waves are there mechanical and non mechanical waves There are 2 types of waves...1. Transverse waves2. Longitudinal waves |
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| 4500. |
Important questions for ipe |
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