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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.
| 3101. |
State vector addition and substraction methods along with their any five properties. |
| Answer» Addition\xa0of\xa0vectors\xa0satisfies two important properties.\tThe commutative law, which states the order of\xa0addition\xa0doesn\'t matter: a+b=b+a. ...\tThe associative law, which states that the\xa0sum\xa0of three\xa0vectors\xa0does not depend on which pair of\xa0vectors\xa0is added first: (a+b)+c=a+(b+c).\tTriangle\xa0law of vector addition\xa0states that when two\xa0vectors\xa0are represented as two sides of the triangle with the order of magnitude and direction, then the third side of the triangle represents the magnitude and direction of the resultant\xa0vector. | |
| 3102. |
in what direction should a passenger Run before trying to catch a slow running train and why |
| Answer» | |
| 3103. |
Define electricity in detail. |
| Answer» Why?<br>It is the form of energy which provides heat and power to operate a machine<br>Electricity is the flow of electrical power or charge<br>Don\'t use copy paste system plz<br>Circuit, cell, bulb, switch... Find out about the electrical terminology your primary-school child will be using in the classroom and try some hands-on activities to support learning about electricity at home.\xa0Electricity can be created in a variety of ways such as:\tburning fossil fuels (oil, gas, coal) at power stations,\tusing wind power generated by wind turbines,\tusing solar power generated by the sun,\tusing water power (sometimes called hydropower) generated by running or falling water.Electricity is transported to our homes, schools and places of work through wires and cables.Electricity can also be stored in batteries (sometimes called cells).\xa0 | |
| 3104. |
What is derived force |
| Answer» A derive force\xa0is a\xa0force\xa0which is either calculated using a mathematical process like using formulas and equations. It is a function of other more fundamental physical quantities.<br>?? Yogita<br>The forces which we see in our day to day life like muscular, friction, forces due to compression and elongation of springs and strings, fluid and gas pressure, electric, magnetic, interatomic and intermolecular forces are\xa0derived forces\xa0as their originations are due to a few fundamental forces in nature. | |
| 3105. |
d/dx(In(1+x^2)) |
| Answer» 2x/1+x^2 | |
| 3106. |
Define inertia. Discuss it\'s types with at least one example of each type. |
| Answer» The inherent property of a material body by virtue of which it cannot change, by itself , its state of rest or of uniform motion in a straight line is called Inertia.DIFFERENT TYPES OF INERTIA:-1) Inertia of rest - The tendency of a body to remain in its position of rest is called Inertia of rest.Example : A person standing in a bus falls backwards when the bus suddenly starts moving forward. When the bus moves , the lower part of his body begin to move along with the bus while the upper part of the body continue to remain in rest due to Inertia of rest. That is why , a person falls backwards when the bus starts.2) Inertia of motion - The tendency of a body to remain in the state of uniform motion in a straight line is called Inertia of motion.Example : When a bus suddenly stops, a person sitting in it falls forward. As the bus stops, the lower part of his body comes to rest along with the bus while the upper part of the body continue to remain in the motion due to Inertia and fall forward.3) Inertia of direction - The inability of the body to change by itself its direction of motion is called Inertia of direction.Example : When a bus takes a sharp turn, a person sitting in the bus experience a force acting away from the centre of the curved path due to his tendency to move in the original direction. He has to hold on a support to prevent himself from swaying away in the turning bus.<br>The tendency of a body to continue in its state of motion is called inertia of motion .Example: Rider Falls forwards when a galloping horse stop suddenly. When the horse stops, the Rider on account of inertia of motion, continues moving and hence falls in forward direction. | |
| 3107. |
Explain different methods to reduce friction. |
| Answer» Following are the different methods that are used for reducing the friction:\tFor objects that move in fluids such as boats, planes, cars, etc, the shape of their body is streamlined in order to reduce the friction between the body of the objects as the fluid.\tBy polishing the surface, as polishing makes the surface smooth and friction can be reduced.\tUsing lubricants such as oil or grease can reduce the friction between the surfaces.\tWhen objects are rolled over the surface, the friction between the rolled object and surface can be reduced by using ball bearings | |
| 3108. |
Friction is necessary evil. Justify. |
| Answer» Frictional force causes a lot of losses in general upkeep and wear and tear of machinery. Hence it is considered as a evil. But almost all crucial tasks cannot be carried out without the presence of friction. Basic activities like walking and writing on a surface are possible due to friction. Hence it is considered as a necessary evil . | |
| 3109. |
Is there anyone from Vidya Niketan High School Sarai maner ?I wants to know information |
| Answer» | |
| 3110. |
Expalne the phenomenon of rounding alevel road |
| Answer» When a vehicle goes\xa0round\xa0a curved\xa0road, it requires some centripetal force. While\xa0rounding\xa0the curve, the wheels of the vehicle have a tendency to leave the curved path and regain the straight line path. Force of friction between wheels and the\xa0roads\xa0opposes this tendency of the wheels. | |
| 3111. |
Write the short note on measurement of length mass and time |
| Answer» In this system,\xa0length\xa0is\xa0measured\xa0in centimeter, weight is\xa0measured\xa0in gram, and\xa0time\xa0is\xa0measured\xa0in seconds. MKS System: MKS stands for meter, kilogram and seconds.<br>Any mechanical quantity can be expressed in terms of three fundamental quantities,\xa0mass,\xa0length\xa0and\xa0time. For example, speed is a\xa0length\xa0divided by\xa0time. Force is\xa0mass\xa0times acceleration, and is therefore a\xa0mass\xa0times a distance divided by the square of a\xa0time.\xa0CGS System: It stands for centimeter, gram and seconds. In this system,\xa0length\xa0is\xa0measured\xa0in centimeter, weight is\xa0measured\xa0in gram, and\xa0time\xa0is\xa0measured\xa0in seconds. MKS System: MKS stands for meter, kilogram and seconds. Here,\xa0length\xa0is\xa0measured\xa0in meter, weight in kilogram and\xa0time\xa0in seconds.\xa0\xa0 | |
| 3112. |
Types of error ? explain. |
| Answer» Hii<br>Types of Errors- Systematic ErrorsErrors which can either be positive or negative are called\xa0Systematic errors. They are of following types:\tInstrument errors: These arise from imperfect design or calibration error in the instrument. Worn off scale, zero error in a weighing scale are some examples of instrument errors.\tImperfections in experimental techniques: If the technique is not accurate (for example measuring temperature of human body by placing thermometer under armpit resulting in lower temperature than actual) and due to the external conditions like temperature, wind, humidity, these kinds of errors occur.\tPersonal errors: Errors occurring due to human carelessness, lack of proper setting, taking down incorrect reading are called personal errors. | |
| 3113. |
Class 11 Plzz tell about free fall detailed analysis .. |
| Answer» Free FallThe motion of falling objects is the simplest and most common example of motion with changing velocity. If a coin and a piece of paper are simultaneously dropped side by side, the paper takes much longer to hit the ground. However, if you crumple the paper into a compact ball and drop the items again, it will look like both the coin and the paper hit the floor simultaneously. This is because the amount of force acting on an object is a function of not only its mass, but also area. Free fall is the motion of a body where its weight is the only force acting on an object.Free Fall: This clip shows an object in free fall.Galileo also observed this phenomena and realized that it disagreed with the Aristotle principle that heavier items fall more quickly. Galileo then hypothesized that there is an upward force exerted by air in addition to the downward force of gravity. If air resistance and friction are negligible, then in a given location (because gravity changes with location), all objects fall toward the center of Earth with the\xa0same constant acceleration,\xa0independent of their mass, that constant acceleration is gravity. Air resistance opposes the motion of an object through the air, while friction opposes motion between objects and the medium through which they are traveling. The acceleration of free-falling objects is referred to as the acceleration due to gravity\xa0gg. As we said earlier, gravity varies depending on location and altitude on Earth (or any other planet), but the average acceleration due to gravity on Earth is 9.8\xa0ms2ms2.\xa0This value is also often expressed as a negative acceleration in mathematical calculations due to the downward direction of gravity.EquationsThe best way to see the basic features of motion involving gravity is to start by considering straight up and down motion with no air resistance or friction. This means that if the object is dropped, we know the initial velocity is zero. Once the object is in motion, the object is in free-fall. Under these circumstances, the motion is one-dimensional and has constant acceleration,\xa0gg. The kinematic equations for objects experiencing free fall are:v=v0−gty=y0+v0t−12gt2v2=v20−2g(y−y0),v=v0−gty=y0+v0t−12gt2v2=v02−2g(y−y0),where\xa0v=velocity,\xa0g=gravity,\xa0t=time, and\xa0y=vertical displacement. | |
| 3114. |
Ncert solution of physics chapter 2 |
| Answer» Example or exercises | |
| 3115. |
The SI units |
| Answer» The seven SI base units, which are comprised of:Length - meter (m)Time - second (s)Amount of substance - mole (mole)Electric current - ampere (A)Temperature - kelvin (K)Luminous intensity - candela (cd)Mass - kilogram (kg)<br>The International System of Units (SI units)The SI units has seven base units and all the other are derived from these seven base units and are called derived units\tBase Physical quantitySymbolSI unitsLengthlMeter (m)MassmKilogram(kg)TimetSec(s)TemperatureTKelvin(K)Electric currentIAmpere(A)Amount of SubstanceNMole(M)Luminous intensityIvCandela(cd)\tSpeed, Volume, density can be derived from these base Units.Some Common Physical quantity and their derived units\tPhysical QuantitySymbolNameUnitMassm , MkilogramkgLinear positionLength, DistanceRadiusx, rl, dRmetermTimet,secondsAreaA-m2VolumeV-m3Density\xa0-kg/m3Linear velocityv, u, c-m/sLinear momentump-kg*m/sLinear accelerationa-m/s2ForceFnewtonN=kg*m/s2ImpulseI-N*sWorkEnergyWEjouleJ=N*mPowerPwattW=J/s\tSI Unit system allow the use of prefix to show multiples or sub multiple of units\tPrefixes in SI system MultiplePrefixSymbol10-12picop10-9nanon10-6microμ10-3millim10-2centic10-1decid10decada102hectoh103kilok106megaM109gigaG1012teraT\t | |
| 3116. |
Ncert philloid app me kya hota hai |
| Answer» Ok thanks | |
| 3117. |
Write the unit vector in the direction of A= 5i+j-2k? |
| Answer» Unit vector = Given Vector/its magnitudeMagnitude of given vector = √25+1+4 =√30 (root 30)So unit vector in the direction of given vector will be 5/√30 î +1√30 j - 2/√30 k | |
| 3118. |
Best book for physics except NCERT |
| Answer» S.cand<br>ABC<br>ABC<br>HC VermaIrodo<br>S. L. Arora | |
| 3119. |
Example of law of conservation of linear momentum |
| Answer» Two bodies of mass M and m are moving in opposite directions with the velocities v. If they collide and move together after the collision, we have to find the velocity of the system.Since there is no external force acting on the system of two bodies, momentum will be conserved.Initial momentum = Final momentum(Mv – mv) = (M+m)VFinalFrom this equation, we can easily find the final velocity of the system. | |
| 3120. |
Find the relative error in z if z=A4 B1/3/cd3/2 |
| Answer» | |
| 3121. |
What is instrumental error?? |
| Answer» This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.htmlFew rules to keep homework help section safe, clean and informative.Don\'t post personal information, mobile numbers and other details.Don\'t use this platform for chatting, social networking and making friends. This platform is meant only for asking subject specific and study related questions.Be nice and polite and avoid rude and abusive language. Avoid inappropriate language and attention, vulgar terms and anything sexually suggestive. Avoid harassment and bullying.Ask specific question which are clear and concise.Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.<br>?? ?? kritika gupta<br>It refers to the combined accuracy and precision of measuring instruments or the difference between the actual value and the value indicated by the instrument(error).......... | |
| 3122. |
Dh |
| Answer» What is the dh??<br>Hii I am new here<br>Dh | |
| 3123. |
a=-kIxIfind velocity given intital x=ov tends to zero |
| Answer» | |
| 3124. |
Order of magnitude in units and measurements |
| Answer» | |
| 3125. |
What is error? Give some example. |
| Answer» It is the difference between the actual value and the value measured<br>Something which is uncertain between the measurement is called error. It can be instrumental error or other error happens due to paralax method.<br>Difference between measurements. Or uncertainty between different measurements. | |
| 3126. |
What is scientific approach? |
| Answer» <article data-post-id="6079" data-topic-id="5172" data-user-id="2" id="post_1">The systematic observations, controlled experiments, qualitative reasoning, mathematical proofs and prediction is called scientific method.</article> | |
| 3127. |
Why work done by centripetal force is zero |
| Answer» because the angle between centriperal force and displacement at every point is 90.And work =force×displacement×cos(theta)<br>Because it is a central forceAnd under the central forces or cycle work done will be zero | |
| 3128. |
State and explain lamis theorem |
| Answer» Lami’s Theorem states, “When three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two forces”. Referring to the above diagram, consider three forces A, B, C acting on a particle or rigid body making angles α, β and γ with each other.In the mathematical or equation form, it is expressed as,{tex}\\frac{A}{sin\\alpha} = \\frac{B}{sin\\beta} = \\frac{C}{sin\\gamma}{/tex} | |
| 3129. |
Vector A • × (vector B× vector C) |
| Answer» | |
| 3130. |
Physics Notes |
| Answer» For PHYSICS notes follow Dinesh new millennium book<br>You will got on this app | |
| 3131. |
If force ‘F’ and velocity ‘V’ and time ‘T’ are fundamental quantities . Find the dimension of ‘E’. |
| Answer» we have to find dimension of E in terms of F V and T. so E=[FVT]<br>[ML²T-2]<br>Energy stands for E | |
| 3132. |
Law about vectors |
| Answer» | |
| 3133. |
State Coulomb\'s law of force between two electric charges |
| Answer» \xa0Coulomb\'s law in electrostatic states that a charge at rest\xa0q1\u200b\xa0applies a force\xa0F\xa0on the other charge\xa0q2\u200b, also at rest, which are separated by a distance\xa0r\xa0such that the force is directly proportional to the product of both charges and inversely proportional to the square of the distance between them.∴\xa0F∝ q1\u200bq2\u200b\xa0and\xa0F ∝ 1/ r21Thus we get\xa0F ∝ q1\u200bq2\u200b\u200b/r2⟹\xa0F = kq1\u200bq2\u200b\u200b/r2\xa0where\xa0k= 1/4πϵo\u200b\u200b\xa0 | |
| 3134. |
Ankit jaldi batao kon si app |
| Answer» Iss app per to books hai<br>Ok | |
| 3135. |
Friends |
| Answer» Konsi app<br>Annu yadav<br>Kha gyi<br>No Annu yadav | |
| 3136. |
Notes chapter 2 |
| Answer» | |
| 3137. |
general instructions |
| Answer» Hi.<br>Sona tum meri hona<br>Hi sona<br>Hi<br>Hello sona | |
| 3138. |
Anyone please tell me when schools will reopen? |
| Answer» May be on 1st September | |
| 3139. |
If the radius of earth is 640km what will be it\'s order of magnitude |
| Answer» Madarchood Teri gannd me mera loda<br>answer\xa0: 10^7 m is the order of magnitude of the radius of the earth.explanation\xa0:\xa0order of magnitude\xa0:-\xa0it is used scientific notation. if any number X in such a way that X = m × 10^n , where m belongs to\xa0\xa0then,\xa010ⁿ is known as order of magnitude.here given, earth\'s radius 6400 kmit can be written as 6400000m [ as we know, 1 km = 1000m]so, 6400 km = 6400000 mnow, 6400000m = 0.64 × 10^7 mhere you can see √10/10 ≤ 0.64 ≤ √10so, 10^7m is the order of magnitude.Thanku | |
| 3140. |
How can we drive projectile method? |
| Answer» | |
| 3141. |
Write where physics is used in society |
| Answer» Physics is used in our everyday life .Ex :car moving on the road , people moving and so on . | |
| 3142. |
What is deffent betweens derived and basic unit |
| Answer» The units that are independent are called fundamental unit The units which are derived from fundamental unit is called derived units<br>The units which can neither be derived from other units nor they can be further resolved into simpler units are called fundamental units. Examples: Mass, length etc.Those units which can be expressed in terms of the fundamental units are called derived units. Example: speed, velocity, acceleration etc. | |
| 3143. |
Find differenciation of 3x^2/sinΦ. |
| Answer» -6x.sin^-2x<br>Hello | |
| 3144. |
How to find tan^-1 (12/3) |
| Answer» | |
| 3145. |
Find the dimension of capacitance |
| Answer» The dimensional formula for capacitance is {tex}M^{-1} L^{-2} T^{4} I^2.{/tex}Capacitance can be defined as the ratio of the change in an electric charge to the corresponding change in its electric potential in a system.\xa0 | |
| 3146. |
Hi guys..kha ho sab..??? |
| Answer» Hello jaanu<br>Apne ghr p?<br>Yhi hai?<br>Hi | |
| 3147. |
Dimension of friction |
| Answer» The dimensional formula of coefficient of friction is given by,[M0\xa0L0\xa0T0]Where,\tM = Mass\tL = Length\tT = TimeDerivationCoefficient of friction (μ) = Frictional Force × [Normal Force]-1\xa0. . . . (1)Since, Force (F) = Mass\xa0× acceleration =\xa0Mass\xa0× velocity\xa0× [Time]-1And, velocity = Displacement\xa0× [Time]-1∴ The dimensions\xa0of Force = [M] × [LT-1]\xa0× [T]-1\xa0= [M1\xa0L1\xa0T-2] . . . . (2)On substituting equation (2) in equation (1) we get,Coefficient of friction (μ) = Frictional Force × [Normal Force]-1Or, μ = [M1\xa0L1\xa0T-2]\xa0× [M1\xa0L1\xa0T-2]-1\xa0= [M0\xa0L0\xa0T0].Therefore, the coefficient of friction is dimensionally represented as\xa0[M0\xa0L0\xa0T0]. | |
| 3148. |
A train 200m long is moving with a velocity 72km/h. Find the time taken by train to cross the bridge |
| Answer» This is because 200/20 = 10 m/s<br>The answer is 10 seconds<br>I think some mistake in your question. Length of bridge is also given in question. Not sure but check it<br>1123328829.09.2019India LanguagesSecondary School+5\xa0ptsAnsweredA train 200 m long moving with a speed of 72 km/hr . Time required by train to cross a bridge which is 1 km long is :2SEE ANSWERSLog in\xa0to add commentAnswer5.0/53lunchspiderAmbitious20\xa0answers482\xa0people helpedAnswer:60 s or 1 minExplanation:Speed of train is= 20m/sSo...In order to cross the bridge 1km long,Train would have to cover the bridge lenght and the train\'s length itself.So...Total distance the train would have to travel= 1000m+200m=1200mAnd..therefore,Time taken by the train to travel 1200m=1200/20 s= 60sHence the train would take 60s or 1 min to cross the bridge. | |
| 3149. |
Prove that the isothermal elasticity of an ideal gas is equal to its initial pressure? |
| Answer» For isothermal process PV = K ................(1) [ T = Constant ]differentiating equation (1) [ K = nRT = Constant ] Pdv + vdp = 0 ⇒ Pdv = − v dp P= −vdpdv P= −B [ B −Bulk modulus ] Hence isothermal elasticity is equal to pressure . | |
| 3150. |
All 3 laws of kinametics including formula? |
| Answer» Kinetic Theory and Gas PressureThe pressure of a gas is the result of continuous bombardment of the gas molecules against the walls of the container. According to the kinetic theory, the pressure P exerted by an ideal gas is given by• Boyle’s LawAccording to this law, the volume (V) of a fixed mass of a gas is inversely proportional to the pressure (P) of the gas, provided\xa0temperature of the gas is kept constant.• Charle’s LawAccording to this law, the volume (V) of a given mass of a gas is directly proportional to thetemperature of the gas, provided pressure of the gas remains constant.• Gay Lussac’s Law (or Pressure Law)According to this law, the pressure P of a given mass of a gas is directly proportional to its absolute temperature T, provided the volume V of the gas remains constant. | |