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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.
| 11301. |
discuss properties of cross product of two vectors? |
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| 11302. |
what is the angle of projection at which horizontal range and maximum height are equal? |
| Answer» 45 degrees | |
| 11303. |
2nd law of motion... Derivation? |
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Answer» Welcome sister No need for sorry... Vaise i know u Thnx..ankit Oh sorry ananya sharma this is your answer This statement is expressed in equation form as,a=FnetmThe above equation can be rearranged to a familiar form asF=maSince force is a vector, Newton’s second law can be written asF⃗ =ma⃗ The equation shows that the direction of the total acceleration vector points in the same direction as the net force vector.Deriving Newton’s Second LawForce is equal to the rate of change of momentumFor Changing MassLet us assume that we have a car at a point (0) defined by location X0 and time t0. The car has a mass m0 and travels with a velocity v0. After being subjected to a force F, the car moves to point 1 which is defined by location X1 and time t1. The mass and velocity of the car change during the travel to values m1 and v1. Newton’s second law helps us determine the new values of m1 and v1 if we know the value of the acting force.Taking the difference between point 1 and point 0, we get an equation for the force acting on the car as follows:F=m1v1−m0v0t1−t0Let us assume the mass to be constant. This assumption is good for a car because the only change in mass would be the fuel burned between point “1” and point “0”. The weight of the fuel is probably small relative to the weight of the rest of the car, especially if we only look at small changes in time. Meanwhile, if we were discussing the flight of a bottle rocket, then the mass does not remain constant and we can only look at changes in momentum.For Constant MassFor a constant mass, Newton’s second law can be equated as follows:F=mv1−v0t1−t0We know that acceleration is defined as the change in velocity divided by the change in time.The second law then reduces to a more familiar form as follows:F=maThe above equation tells us that an object will accelerate if it is subjected to an external force and the amount of force is directly proportional to the acceleration and inversely proportional to the mass of the object.What is a Net Force?A net force ΣF is the sum of all forces acting on a body. More precisely, it is the vector sum of all forces acting on a body. Calculating the net force acting on a horseConsider two forces of magnitude 30 N and 20 N that is exerted to the right and left respectively on the horse shown in the picture. If we assume the rightward direction as positive, then the net force on the horse can be calculated as follows: ∑F=30N−20N=10N ∑F=10Ntotheright |
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| 11304. |
Quantum number? |
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Answer» Ananya yadav? I m not ananya yadav... I m ananya sharma Welcome sister Thnx ankit This your answer ananya yadav a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values. |
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| 11305. |
Covid 19 is which type of virus? |
| Answer» Coronaviruses are a large family of viruses that are known to cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS). | |
| 11306. |
Differentiate between distance and displacement |
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Answer» Displacement is the shortest path between final and initial point Distance: it is the actual path travelled by the body during course of motion* sI unit is metreDimension [m°L1T°] \t\xa0Distance Displacement1. It is the length of path traversed by the object in a certain time. \xa0\xa0\xa0\xa02. It is a scalar quantity that is it has only the magnitude.\xa03. It depends on the path followed by the object.\xa04. It is always positive.\xa0\xa05. It can be more than or equal to the magnitude of displacementIt is the distance traveled by the object in a specified direction in a certain time (that is the distance between the final and initial positions).\xa0It is a vector quantity that is it has both the magnitude and direction.\xa0It does not depend on the path followed by the object.\xa0It can be positive, negative and even zero.\xa0Its magnitude can be less than or equal to the distance\t Short length is known as distance while longer one is known as displacement |
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| 11307. |
Is fundamental pq and supplementary pq dimensionless units |
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Answer» Fundamental physical quantity have dimension& unit as well , supplementary quantity are dimensionless but have units Yes ofcourse because it involves thetha which is demensionless No |
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| 11308. |
Which of the following has meter Kelvin as unit Ridbergs constant or Weings constant |
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| 11309. |
Where i check the answers of sample paper |
| Answer» By link or scan | |
| 11310. |
What are units fundamental units derived units and System of units |
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| Answer» The units which are independent of each other are known as Fundamental Units. Derived Units are derived from Fundamental Units. For example, meter is a fundamental unit of length and second is a fundamental unit of time. However, meter per second (ms-1) is a derived unit of velocity. There are seven fundamental units as given in the below table: | No. | Quantity | Fundamental Unit | Symbol | \t\t\t1.Lengthmetrem2.Masskilogramkg3.TimesecondS4.TemperatureKelvinkg5Electric currentampereA\t|
|---|---|---|---|---|---|
| 11311. |
Define the SI unit of solid angle. |
| Answer» \xa0A\xa0steradianis the SI unit of solid angle.It can be defined as the solid angle substended at a center of an unit,sphere by a unit area on its surface.For a general sphere of radius r, any portion on its surface with area A=r\u200b\u200b\u200b\u200b\u200b\u200b2 | |
| 11312. |
Derive: v^2-u^2 by calcus method |
| Answer» What is calcus method | |
| 11313. |
Is the displacement time graph and the position time graph represents the same things?Yes or no |
| Answer» No | |
| 11314. |
Find angle between two vectors A and B such that A=4i+6j-3k and B=2i +3j-4k |
| Answer» You just take dot product of vector A and vector B and equate it with ABCosø So then dot product of vectors A and B/AB =Cosø Finally, ø =cos inverse of vector A.vector B/AB | |
| 11315. |
Under which condition average velocity is equal to instantaneous velocity |
| Answer» Instantaneous velocity can be equal to average velocity when the acceleration is zero or velocity is constant because in this condition all the instantaneous velocities will be equal to each other and also equal to the average velocity. Or distance -time graph will be a straight line whose slope (velocity) is same at every point . | |
| 11316. |
Prove that the distance travelled by a body in the nth second is snth = u + a/2 (2n-1) |
| Answer» \xa01. Graphical Method:The distance travelled is the area of the shaded portion.\xa0= area of CDFG + area of BCDE= area of CDFG + area of ADE - Area of ACB2. Integration method: | |
| 11317. |
What is instantaneous velocity |
| Answer» Instantaneous velocity\xa0describes how fast an object is moving at different instants of time in a given time interval. It is also defined as average velocity for an\xa0infinitely small time interval.Here\xa0lim is taking operation of taking limit\xa0with time tending towards 0 or infinitely small.dx/dt is differential coefficient\xa0– Rate of change of position with respect to time at an instant. | |
| 11318. |
(LT^-1) (LT^-2) /M^-1T^-1 |
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Answer» What is physical quantity? M^1 L^2 T^-2 |
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| 11319. |
Anyone has syllabus?? |
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Answer» Hello Yes I have |
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| 11320. |
Find the dimension of gravitational constant \'G\' |
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Answer» M-1 L3 T-2 The dimensional formula of gravitational constant is given by,M-1\xa0L3\xa0T-2Where,\tM = Mass\tL = Length\tT = TimeDerivationFrom\xa0Newton’s law of gravitation,Force (F) = [GmM] × r-2Gravitational Constant (G) = F × r2\xa0× [Mm]-1 . . . . (1)Since, Force (F) = Mass × Acceleration = M × [LT-2]∴ The\xa0dimensional formula\xa0of force =\xa0M1\xa0L1\xa0T-2\xa0. . . . (2)On substituting equation (2) in equation (1) we get,Gravitational Constant (G) = F × r2\xa0× [Mm]-1Or, G = [M1\xa0L1\xa0T-2]\xa0× [L]2\xa0× [M]-2\xa0= [M-1\xa0L3\xa0T-2].Therefore, the gravitational constant is dimensionally represented as\xa0M-1\xa0L3\xa0T-2. |
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| 11321. |
If sin (theta /2 ) = 2 . Find theta in radian. |
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Answer» How much chapter have u covered 1.047 rad |
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| 11322. |
Find the dimension x,y,z from the equation a=xt+fty+mt^2z |
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| 11323. |
Light year is a unit of time true false |
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Answer» False False Because light year is distance travelled by light in the one year Light year is the unit of distance and it is the distance covered by the light in time of one year. So the given statement is false. |
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| 11324. |
What is the range of gravitational and electromagnetic force |
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Answer» Gravitional force is 10-39 powerElectromagnetic force is 10-2 \tNameRelative StrengthRangeOperates amongGravitational force10–39InfiniteAll objects in the universeElectromagnetic force10–2InfiniteCharged particles\t |
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| 11325. |
What is the coefficient of static friction called? |
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Answer» What is physics It is “The\xa0maximum ratio of applied force to normal force with no motion”\xa0we all know Frictional force is a\xa0force which opposes motion. If we keenly observe, once you apply force to move a body from rest, there exists a point up to which the body resist to move. To move the body the applied force should be greater to overcome this resistance. This maximum resistive force offered by the body against the applied force to continue its state of motion is called\xa0Coefficient Of Static Friction. |
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| 11326. |
Integration of 4 and 1 under root x dx |
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| 11327. |
Ankit jaldi batao |
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Answer» Iss app me kya hota hai?? ncert book (philiod) app |
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| 11328. |
How technology and physics depend each other |
| Answer» Both are related.... To see full answer missed call on 9472145683 | |
| 11329. |
Derivation of collisions in one dimension |
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| 11330. |
system of particles and rational number |
| Answer» rotational Motion ***** | |
| 11331. |
Name the physical quantities, which have units but no dimensions |
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Answer» Angle and solid angle Scalar quantity have units but no dimensionsI hope it will help you! ? Scalar quantities |
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| 11332. |
a= x2 Find v when x is 2m. Given - at x=0 , body is at rest.... |
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Answer» I\'m good and mine studies too... what about uhh? ?... Chemistry k liye... Unacademy ya physics wallah wale channel pe dekhna ek bar ?..... aur mereko nii pta ye Pksis name se kaun tha... Maine bhi dekha tha ?............ Few days ago , I noticed someone answered someone question with her name PKsis . You know her???? Can you guess? 8/3 .....how r u ..and what\'s about your study . PLZZ recommend me a chemistry teacher. Thanks..... vdv/dx=aso a=x^2vdv/dx=x^2by intigrationv^2/2=x^3/3so at 2m v=4/3^-1/2 |
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| 11333. |
what is pseudo force...? |
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Answer» if we want to apply newton\'s second law from non inertial frame (i.e. moving have some acceleration) then we have to apply pseudo force in opposite direction of motion of observer. Force by pseudo |
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| 11334. |
Dimension of stress n strain?? |
| Answer» The SI unit of stress is Newton per square meter. Or we can express the same in terms of Pascal.1 Pascal = 1 Pa = 1 N.m-2.While there is no unit for strain. It is a dimensionless quantity. This is because it is the ratio of change of length to the original length, and therefore it is unitless. | |
| 11335. |
Which book is best for NEET 11th and 12th physics practice. |
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Answer» MTG Publishers best book for neet prepration. class 11 < abc of pcb> Is USS good book??? |
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| 11336. |
Define solid angle and plane angle. |
| Answer» Plane angle is the measure around a point which is a 2D object. On the other hand, solid angles is for 3D objects. For example, angle of a triangle is a plane angle whereas angle made by the corner of a room is a solid angle. | |
| 11337. |
Can anyone tell me how to study for mcq in physics. |
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Answer» Read ncert deeply hello nawal I would suggest u to solve number of mcq based questions and u can find a lot of questions on different websites but if u ask me so I prefer learncbse.com if u will search for mcq regarding to any chapter on this website u will find a lot of question best way to improve physics is to solve a number of questions |
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| 11338. |
Chapter 2 ncert example 1 |
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| 11339. |
The energy of photon of radiation having wavelength 300 nm |
| Answer» Photons\xa0are electrically neutral.\xa0Photons\xa0have no mass, but they have\xa0energy\xa0E = hf = hc/λ. Here h = 6.626*10-34\xa0Js is a universal constant called Planck\'s constant. The\xa0energy\xa0of each\xa0photon\xa0is inversely proportional to the\xa0wavelength\xa0of the associated EM wave.\xa0The energy associated with a single photon is given by\xa0E = h ν\xa0, where\xa0E is\xa0the energy (SI units of\xa0J), h is\xa0Planck\'s constant\xa0(h = 6.626 x 10–34\xa0J\xa0s), and ν is the frequency of the radiation (SI units of s–1\xa0or Hertz, Hz)\xa0 | |
| 11340. |
Supplimentory units |
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Answer» Bro contact no do na plz name ke sath Supplementary units are the dimensionless units that are used along with the base units to form derived units in the International system. The class of supplementary contains only two purely geometrical units, that is the radian and the steradian. |
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| 11341. |
Ordered pair |
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Answer» Ordered paired is a set in which the arrangement of any number or alphabet in accenting order A pair of numbers in a specific order . For ex- (1,2) , (-4,12) |
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| 11342. |
Justify L+L=L,and L- L =L |
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| 11343. |
A physical quantity of dimension of length that can be formed out c, G and e²/4π£ |
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| 11344. |
If A=(12.0+-0.1)cm and B=(2.5+-0.5)cm.find (a) A+B;(b) A-B |
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| 11345. |
What do you mean by kinematics ¿¿?? |
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Answer» Hii you both kitte dino baad Fine sis.... Aap kaise ho... Kitna ℅aaya??? hello ✌?... How r uhhh? ? The branch of physics that deals with the study of motion is known as kinematics The study of motion is called kinematics |
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| 11346. |
Convert 1 newton mtodynes |
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Answer» Miya nassiruddin path ka sandesh kya h Convert 1 newton into dyne question ye tha Sorry 1 newton=100000 dyne Not motodynes here u write dyne |
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| 11347. |
P=b-x²/at |
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| 11348. |
What is the acceleration of a particle moving with uniform velocity of an object |
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Answer» Zero acceleration Acceleration is the rate of change in velocity expressed mathematically as dv/dt \u200b = a. An object moving at uniform or constant velocity has zero acceleration. |
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| 11349. |
2.09 roundoff |
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Answer» 2.1 2.2 3 2.1 2.1 |
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| 11350. |
What is alternation generation? Explain wid example. |
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Answer» Hindi Alternation of generations is common in plants, algae, and fungi. This can be compared to the sexual reproduction in animals where both haploid and diploid cells are found in every generation.Plants alternate between the diploid sporophyte and haploid gametophyte, and between\xa0asexual and sexual reproduction. Therefore, the life cycle of plants is known as alternation of generations. The ability of the plants to reproduce sexually and asexually helps them to adapt to different environments.\xa0In Bryophytes, the dominant generation is haploid and the gametophyte comprises the main plant. In tracheophytes, the dominant generation is diploid and the sporophyte comprises the main plant.\xa0 |
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