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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.
| 9951. |
Derive stokes formula dimintial analysis |
| Answer» F=k(eta)a(vel.)b(radius)c[MLT(-2)]=[ML(-1)T(-1)]a [LT(-1)]b [L]c[MLT(-2)=[M(a)] [L(-a+b+c)] [T(-a-b)]Now solve for the powers in M,L,T...... | |
| 9952. |
How to find centre of mass? Derivation. |
| Answer» Let in a system of many particles the co-ordinates of centre of mass of the system be (Xcm,Ycm,Zcm) then position vector of centre of mass would be Rcm=Xcmi+Ycmj+Zcmk (1)and position vectors of various particles would be EQ (2) Motion of centre of massDifferentiating equation 1 we get p is the vector sum of linear momentum of various particles of the system or it is the total linear momentum of the system.If no external force is acting on the system then its linear momentum remains constant. Hence in absence of external forceIn the absence of external force velocity of centre of mass of the system remains constant or we can say that centre of mass moves with the constant velocity in absence of external force.Hence from equation 18 we came to know that the total linear momentum of the system is equal to the product of the total mass of the system and the velocity of the centre of mass of the system which remains constant.Thus in the absence of the external force it is not necessary that momentum of individual particles of system like p1 , p2 , p3 . . . . . . . . . . . pn etc. remains constant but their vector sum always remains constant | |
| 9953. |
The percentage error in the volume of a cube is 8%. Find percentage error in the total area of cube. |
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Answer» Sorry its 16/3 4% |
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| 9954. |
P versus V graph for adiabatic isothermal isochoric and isobaric processes. |
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| 9955. |
Which is more important in physics :derivations,conceptual or numericals |
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Answer» Derivation and conceptual All of these important in physics |
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| 9956. |
Difference between reflection and refraction? |
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Answer» Reflection takes place in mirror anf refraction is lens.Reflection required a polished aurface but refraction does not.Reflection is of 2 types regular and irregular but refraction is not divided such It is a property of light in which light coming from source strike an interface and after striking ,it will bend in same medium in such a manner that angle of incidence and reflection are equal. ☺️☺️☺️ Refraction. Light coming from source strike an interface and after striking light will enter in second medium.If second medium is denser, it will bend towards normal. If rarer ,light will bend away from normal.??? Thanks vaishnavi but i want some more differences, it\'s a 3 marks question. The phenomenon of bouncing back of light in same medium is reflection and when the light ray passes from one medium to another this phenomenon is called refraction |
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| 9957. |
What is isolated system |
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Answer» In which neither mass nor energy transfers In which neither mass is exchanged nor heat is transfered from system |
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| 9958. |
What is carnot cycle and is derivation |
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| 9959. |
Explain refrigerator principle. |
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Answer» https://www.butterflyfields.com › resources The compressor constricts the refrigerant vapor, raising its pressure and temperature, and pushes it into the coils of the condenser on the outside of the refrigerator. ... The refrigerant absorbs the heat inside the fridge when it flows through the evaporator coils, cooling down the air inside the fridge. |
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| 9960. |
Dree of freedom |
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Answer» for monoatomic 3 diatomic 5 more than 6present how freely a small particle can move in any axis one x ais or in y or in z 7825914739 we shall joined as a freind |
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| 9961. |
What are the most important topics of physics |
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Answer» Thermal physics except they gave written all Collision and work enrgy theorem system of particles. and thermodynamics. .. mechanical properties. , optics, waves and oscillation , motion, |
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| 9962. |
Why is physics????? |
| Answer» Physics is a branch of science which explain about the natural phenomenon based on the experience ,experiment and mathematicaly analysis.........☺ | |
| 9963. |
Why newton\'s law of gravitation is said to be universal law? |
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Answer» Because it is based on the law of gravitation and gravity acts on the whole world..... that\'s why it is said to be universal law... Because it is universally accepted... |
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| 9964. |
Define the term elasticitg |
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Answer» property of a solid to oppose the effect of deforming force and to regain its natural shape after deformed In simple language:-The property of the rigid body to restores its original shape and size after the removal of ext. Force....is called ELASTICITY......??........BY THE WAY ,ur answer is also correct tripti? Elasticity is a property of solid by virtue of which a perticular body opposes ( the force which was applied on it) and regain its original shape and size... |
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| 9965. |
What is the adiabatic relation between p,v and t |
| Answer» Adiabatic reaction is where heat is constant.The relationship between- By ideal gas equation v=Rnt/p | |
| 9966. |
Why do statinory waves do not transport energy |
| Answer» as they are standing waves means from two sides wave comes and due to very small energy diff statinary waves become a line wave | |
| 9967. |
What\'s the physical significance of moment of inertia. |
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Answer» Thanku se kaam nahi chalega....... Thankyou Moment of inertia is a measure of how difficult it is to rotate a particular body about a given axis. significance: Greater the mass concentrated away from the axis, greater the moment of inertia. Greater the mass concentrated away from the axis, greater the moment of inertia |
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| 9968. |
If kinetic energy of a body increase by 300% by what will the linear momentum of a body increases. |
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| 9969. |
What is tensile strength? |
| Answer» Ultimate strength | |
| 9970. |
The velocities of three molecules are 3v,4v and 5v,then find root mean square velocity |
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| 9971. |
If acceleration in S.H.M. is given by a= -bx then find its time period. |
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Answer» Sorry my physics is very weak You can tell me On 7 |
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| 9972. |
A force of 50 N is applied on a circular surface of radius 1 cm.then find stress. |
| Answer» Stress =f/a area = 22/7*1*1=50*7/22=15.9=16 | |
| 9973. |
The displacement of harmonic oscillator is Y=0.5 sin 100^t cm.then find amplitude and time period. |
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| 9974. |
The displacement of harmonic oscillator is Y=0.5 sin 100 ; |
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| 9975. |
Find the coefficient of carnot engine |
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| 9976. |
If friction does not depend upon area than why rolling friction is less than friction |
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| 9977. |
Coefficient of performance of refrigerator |
| Answer» Q1-Q2/t | |
| 9978. |
How much marks each chapter consist? |
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| 9979. |
If x=a+bt+ct^2,where xis in meters and it is in second,what is the dimensional formula of c. |
| Answer» Dimensional formula of c is= M^1 T^-2 | |
| 9980. |
Limitations of bernouli\'s principle & pascal\'s law |
| Answer» * Bernoulli\'s equation is applicable only to the incompressible .* Bernoulli\'s equation is applicable only to the streamline flow of a fluid and not when the flow is turbulent | |
| 9981. |
Drive the lens makers formula for a double convex lense |
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| 9982. |
(1+h/R)^-2=? |
| Answer» It is the formula of variation in \'g\' due to height | |
| 9983. |
Why an air bubble in water rises from bottom to top in grows in size ? |
| Answer» Because the aquatic plants produce oxygen by the process of photosynthesis and that oxygen is absirbed by water and thats how fiahes get oxygen and the remaining oxygen is transfered to atmosphere and as much oxygen as bigger the bubble | |
| 9984. |
What is kinetic interpretation of temperature |
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| 9985. |
is there any chapter of class 12 added in class 11 physics ? |
| Answer» Yes..ray optics is added | |
| 9986. |
When a body accelerates by @t, what is the velocity after time \'t\', when it starts from rest? |
| Answer» according to v = u +a*tas the body starts fro rest sou = 0so final velocity v after t time is\xa0v= a*t | |
| 9987. |
Definition for banking of roads. |
| Answer» When the road is made isn\'t plane but slightly titled by some angle either to the right side or left side, it is called banking of roads | |
| 9988. |
Cp- cv=r derive |
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Answer» It is Mayer\'s equation.Derivation:ΔU = ΔQ + ΔW ΔU = Cv ΔT (At pressure is constant)ΔQ = Cp ΔT (At pressure is constant)ΔW = -P ΔV (Negative since the calculation been complete)Pv = RT (1 mole of gas)Because of pressure is constant, R is also constantChange in V will make change in TPΔV = R ΔTCv ΔT = CpΔT - RΔTDivided by ΔTCv = Cp - RCp - Cv = R U=q-wnr∆t=ncp∆t - ncv∆tr=cp-cv( n and ∆t will be cancelled out) |
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| 9989. |
Derive an expression for excess pressure inside a liquid bubble? |
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Answer» let us consider a hollow bubble of radius \'r\' and internal diameter \'d\' and thickness \'t\'.let s= surface tension;\xa0P= pressure intensity inside liquid bubble;d= internal diameter of the bubble;t= thickness;let us cut the soap bubble into two halvestensile force acting along the surface( inner and outer) circumferential of the cutting portion and is given byF=s*3.14*d+s*3.14*(d+t)as t< | |
| 9990. |
Calculate the total number of electrons present in 100gm of water. Also find the total charge |
| Answer» we know that 1 molecule of water have (1*2+8=10) electrons.no. of water molecules in 18gm of water is equal to avogadro number ie., 6.022*1023\xa0H2O molecules.100gm = 100*6.022*1023\xa0/ 18we got no of molecules in 100 gm is 100*6.022*1023/ 18 H2O molecules.thus number of electrons in 100gm of water ie., 100*6.022*1023/18 H2O molecules is = 100*6.022*1023*10/18 = 334.55*1023\xa0electronscharge on each electron is -1.9*10-19\xa0coulombtotal charge = 334.55*1023*(-1.9*10-19);total charge = 635.65*104 Coulomb. | |
| 9991. |
What are theApplications of elastic behaviour of materials? |
| Answer» Following are the applications of elastic behaviour of materials as:1. Shock Absorber in machinery items as well as in automobiles.2. Bridges and columns are constructed by considering\xa0the elastic behaviour of material as per load capacity.3. Every development or manufacturing is done by considering the elastic behaviour of material according to the applying load. | |
| 9992. |
State the conditions under which a force does no work. |
| Answer» When the force produces 0 displacement and when the displacement is perpendicular to the force applied | |
| 9993. |
A bullet fired at an angle 60degree with the horizontal hits the ground 4 km |
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| 9994. |
Fandamental and base quantities |
| Answer» There are 7 basic fudamental units - length, mass, time, electric current temperature, amount of substance, and luminous intensity. | |
| 9995. |
What will happen if an elastic material is subjected to a stress greater then elastic limit load? |
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Answer» It can\'t deformed and finally fracture in Then there will be occurence of strain ib material that is the material will deform |
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| 9996. |
Different between the dimon &gold? |
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Answer» First one is allowing other one is metal first one has lower electrical conductance other one has higher first one has higher thermodynamic stability first one has sp3 hybridisation\'s of carbon which for covalent bonds second one has metallic bonding in between atoms Diamond is diamond and gold is gold ????? |
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| 9997. |
Whay is the formula of force |
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Answer» Ok.. nope Darshana Did u use grade up? Force = MASS × ACCELERATION Force = Mass ×Acceleration. |
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| 9998. |
What is the angle made by a vectorA is equal to 2iCAP + 2J cap with the x axis |
| Answer» 45 degree | |
| 9999. |
2016 set2 |
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| 10000. |
Plz tell how to refresh the page to get new questions |
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