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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.
| 5151. |
Factor that\xa0rigid\xa0body depend |
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| 5152. |
Write the relation between two angles for which horizontal Ranges will be equal. |
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| 5153. |
Deduce the height at which the value of g is the same as at a depth of R÷2 ?\xa0 |
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| 5154. |
What is magnetic & azimuthal quantum number. |
| Answer» Ans. The Azimuthal Quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital. The azimuthal quantum number is the second of a set of quantum numbers which describe the unique quantum state of an electron (the others being the principal quantum number, following spectroscopic notation, the magnetic quantum number, and the spin quantum number). It is also known as the orbital angular momentum quantum number, orbital quantum number or second quantum number, and is symbolized as\xa0{tex}\\varphi{/tex}The Magnetic Quantum number, designated by the letter ml,[dubious ] is the third in a set of four quantum numbers (the principal quantum number, the azimuthal quantum number, the magnetic quantum number, and the spin quantum number) which describe the unique quantum state of an electron. The magnetic quantum number distinguishes the orbitals available within a subshell, and is used to calculate the azimuthal component of the orientation of orbital in space. Electrons in a particular subshell (such as s, p, d, or f) are defined by values of {tex}\\varphi{/tex}(0, 1, 2, or 3). The value of m can range from {tex}-\\varphi \\space to \\space \\varphi{/tex}\xa0inclusive of zero. | |
| 5155. |
state and prove bernoullis threom? |
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| 5156. |
How to\xa0prove work energy throem by calclues method\xa0 |
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| 5157. |
Convert 144km/ hr to m/s? |
| Answer» Ans.\xa0{tex}144Km/h = {144\\times 1000\\over 3600} = 40m/s{/tex} | |
| 5158. |
The dimensional formulae of wavelength and frequency of a wave\xa0 |
| Answer» Dimensional formula of wavelength = [M0L1T0]Dimensional formula of frequency = [M0L0T-1] | |
| 5159. |
The number of significant figures in 6.2000 multiplied by 10 to the power 8 s |
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| 5160. |
state and prove benoulli"s theorem.give tow application of it? |
| Answer» I just hate BERNOULLI | |
| 5161. |
How does internal resistance and EMF of a dry cell change with time |
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| 5162. |
1 parsec is equal to. .......... Light year |
| Answer» One parsec is the distance at which one astronomical unit subtends an angle of one arcsecond. A parsec is equal to about 3.26 light-years (31 trillion kilometres or 19 trillion miles) in length. | |
| 5163. |
The order of mass of univers is ..?\xa0 |
| Answer» ~1052 | |
| 5164. |
The dimensions of grevitaonal constant...........? |
| Answer» The dimensions of gravitational constant :\xa0{tex}L^3M^{-1}T^{-2}{/tex} | |
| 5165. |
\tWhich of the length measurement is most accurate...? (A)500.0cm (B)0.0005cm (C)6.00cm (D)0.0063256 |
| Answer» The most accurate measure is 0.005 mm. This is because the value has been measured up to three decimal places unlike the other two values. This means that 0.005 mm is actually closer to the value being measured than the other values as compared to the values that they represent.\xa0You can also check the same by writtng all these in scientific notation.\xa0 | |
| 5166. |
\tA vehicle moving with a speed of 72km/h cover distance in m/sec equal to...................? |
| Answer» 1 hour = 3600s\xa01 Km = 1000 mdistance covered in 3600 seconds = 72000mDistance covered in 1 second =\xa0{tex}{72000\\over 3600 } = 20m{/tex}So it is 20m/s | |
| 5167. |
The S.I. unit used to express the amount of substance is.................... |
| Answer» Mole | |
| 5168. |
Light year is a unit of................ |
| Answer» Light year is the unit of length used to express astronomical distance . | |
| 5169. |
1 light year is equal to............... |
| Answer» 9.46×1015 m | |
| 5170. |
\tthe dimensions of rate of flow is….? |
| Answer» Rate of flow is defined as the quantity of a fluid flowing per second through a section of a pipe or a channel.Rate of Flow ={tex}Volume \\over time {/tex}= m3/sPutting these values in above equation we get,Dimensional Formula of Rate of Flow= M0L3T-1 | |
| 5171. |
the value of 1 joule in erg...........? |
| Answer» 1 joule = 10000000 erg | |
| 5172. |
the order of the size of our galaxy is...........?\xa0 |
| Answer» Ans. The diameter of the Milky Way galaxy is about 9.5 x 1017 Km\xa0 | |
| 5173. |
\tHow elastic spring forces arise? |
| Answer» The elastic spring force arise due to the net attraction/repulsion between the neighboring atoms of the spring when the spring is elongated/compressed.This net attraction/ repulsion can be traced to the sum of electric forces between the charged constituents of the atoms. | |
| 5174. |
\tGive a method to measure size of the atom using Avogadro’s hypothesis?\xa0 |
| Answer» By Avogadro\'s hypothesis, the actual volume occupied by the atoms in one gram of a substance is 2/3rd of the volume occupied by 1 gram of the substance.Let us consider a sample of a substance of mass m and volume V. If M is its molecular weight and Avogadro number is N, thenNumber of atoms in the given sample =\xa0{tex}{N\\over M}× m = {Nm\\over M}{/tex}let each atom is a sphere of radius r..So\xa0Actual volume of the atoms in the given sample =\xa0{tex}{Nm\\over M}×{4\\over 3}\\pi r^3{/tex}\xa0By Avogadro\'s hypothesis{tex}{Nm\\over M}×{4\\over 3}\\pi r^3 = {2\\over 3}V{/tex}If\xa0{tex}\\rho{/tex}\xa0is density of substance . Then{tex}\\rho = {m\\over V} \\\\=> V = {m\\over \\rho}{/tex}{tex}=> {Nm\\over M}×{4\\over 3}\\pi r^3 = {2\\over 3}{m\\over \\rho}{/tex}{tex}r = \\left ({M\\over 2 \\pi N\\rho }\\right )^{1\\over 3}{/tex}Knowing values of M,N and\xa0{tex}\\rho{/tex}We can find radius\xa0 | |
| 5175. |
\tFind whether the formula given below in dimensionally correct.FS = 1/2mv2 – 1/2mu2 |
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Answer» ofcourse the above equation is dimensionally\xa0correct[F][S]=[m][v]2-[m][u]2[MLT-2][L]=[M][LT-1]2-[M][LT-1]2[ML2T-2]=[ML2T-2]+\xa0[ML2T-2]WE know subraction of same dimensions givse the same dimensionso[ML2T-2]=[ML2T-2]L.H.S.=R.H.Shence the above equation is dimensionally correct. Mebsion its measures. |
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| 5176. |
\tWhat do you understand by fundamental quantities and units? |
| Answer» \tThe quantities that do not depend on any other physical quantity for their measurement are known as fundamental quantities.These quantities do not take support of other physical quantities for its measurement. There are only 7 physical quantities.\tAfundamental unit is a unit of measurement for a measurable physical property from which every other unit for that quantity can be derived.Fundamental units are also known as base units. | |
| 5177. |
\tWhat are the advantage of SI system of units.? |
| Answer» The International System of Units, symbolized SI, is the simplified modern version of the metric system.\tNo conversions (only one unit for each quantity)\tNo numbers to memorize (derived units are defined without numerical factors)\tNo fractions (decimals only)\tNo long rows of zeros (prefixes eliminate them) Only 30 individual units (compared to hundreds of traditional units)\tEasy to pronounce and write (short names; simple letter symbols)\tBased on natural standards (size of Earth, water, laws of physics)\tCoherent system (symbols can be manipulated algebraically)\tWorld standard (even traditional U.S. units are defined by it) | |
| 5178. |
\tMeter is well defined in term of wavelength and time in terms of periods of radiation. Why? |
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| 5179. |
\tHow the distance of nearest star can be determine? |
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| 5180. |
\tExplain the method to determine the size of moon? |
| Answer» He was actually timing how long between the entry and exit of the darker (umbral) shadow. Which to him appeared to be around 2.6 hours. Next, he compared this with the time it takes the moon to move a distance equal to it’s diameter.\xa0In the previous article we determined that this was about 1 hour. So he’s left with two numbers:\ttime it takes the moon to travel 1 moon diameter =\xa01 hour\ttime it takes the moon to travel 1 earth diameter =\xa02.6 hoursHow could we figure out the size of the moon from this?If the times were equal than it would imply that the moon is the same size as the earth.\xa0However the time of a lunar eclipse is much longer, which means the earth must be larger. How much larger? We need to setup a basic proportion:time #1 / time #2 = moon diameter / earth diameter1 / 2.6\xa0= moon diameter / earth diameterThis led him to claim that the earth was about\xa08/3\xa0the diameter of the moon. This is pretty close to the actual difference:\xa0the earth is about 3.7 times bigger than the moon. The main reason he underestimated was because the umbral shadow is narrower than the earth.Actual size of the moonWe now know the relative size of the moon compared to earth. We also know the actual size of the earth from a previous calculation. Finally we can determine the approximate size of the moon!moon diameter = earth Diameter / 3.7moon diameter = 12742/3.7 =\xa03444\xa0kmThis is very close to the actual diameter of the moon:\xa03474.8 km | |
| 5181. |
\tExplain the echo to find the distance of moon ? |
| Answer» In this method, laser beam is used in place of sound waves to find the distance of moon from earth.A laser beam is sent towards moon. This transmitted beam from earth is received back on earth after reflection from the moon.Suppose the time interval between transmission and reception of the beam is t, the velocity of beam in air/vacuum is c and s is the distance of moon from earth, ThenDistance=Velocity x time2s=c x t ors=\xa0{tex} {ct \\over 2}{/tex} | |
| 5182. |
What are the three region of phenomenal progress in physics in the last few centuries??\xa0 |
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| 5183. |
How static friction provides centripetal acceleration\xa0 |
| Answer» A car in a steady turn has a centripetal acceleration. There is an inertial force associated with every acceleration acting in the opposite direction and in this case it is the centrifugal force. The friction at the tires arises as a centripetal force to match the centrifugal force. | |
| 5184. |
\xa0g1 = g (1 - 2 / 291)^ 1/ 2\xa0 |
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| 5185. |
difference between qualitative and quntitative analysis\xa0\xa0 |
| Answer» \tQualitative AnalysisQuantitative AnalysisQualitative Analysis is used when the researcher wishes to analyze data that are subjective and not numerical.In the quantitative analysis the data is analyzed through statistical means.This focuses on descriptive data.This focuses on numerical data.This can be used to explore attitudes, behavior, nature of experience, etc.This can be used for presenting percentages or any form of statistically significant data.\t | |
| 5186. |
explain the two principle thruts in physics with example |
| Answer» Two principles thrusts in the study of Physics are\tUnification which means explaining different physical phenomena by using few laws and concepts. Example: Electricity, magnetism and light are different phenomena and have different laws of physics for each of them. These are unified under theory of electromagnetism; all these three phenomena can be explained from this theory of electromagnetism.\tReductionism which means explaining complex phenomena by breaking them into smaller constituents and studying simpler parts.Example: A complex music can be broken down to simple sine waves so that we can make the music piece from the simple tones. | |
| 5187. |
If length of pendulum of a wall clock is increased by 0.1% then find error in time per day? |
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| 5188. |
Surface tension\xa0 |
| Answer» \t\tthe tension of the surface film of a liquid caused by the attraction of the particles in the surface layer by the bulk of the liquid, which tends to minimize surface area.\t | |
| 5189. |
parallax method questions\xa0 |
| Answer» Why we need to convert minute into seconds for finding distance in parallax method? | |
| 5190. |
What is the dimension of magnetic flux? |
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Answer» Weber is SI unit of magnetic flux is Weber.Dimensional formula =\xa0{tex}ML^2T^{−2}A^{−2}{/tex} {tex}ML^2T^{-2}A^{-2}{/tex} |
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| 5191. |
What is the value of tan^-1 (40/30)???plz show step by step answer.... |
| Answer» By using tangent table we can find this value{tex}\\begin{array}{l}\\theta = {\\tan ^{ - 1}}(\\frac{{40}}{{30}})\\\\\\theta = {\\tan ^{ - 1}}(1.33)\\\\\\theta = {53^ \\circ }7\'\\end{array}{/tex} | |
| 5192. |
A body is thrown from a tower it covers 40m in last 2 second find height of tower |
| Answer» Let h be the height of the tower and t the time taken\xa0u=0 and g= 10m/s2Using S= ut +1/2 gt2h= 0+5t2 -----(1)distance travelled in last 2 seconds is 40 magain using S= ut +1/2 gt2h-40= 0+5(t-2)2\xa0-----(2)subracting 2 from 1h-h+40= 5(t2\xa0- (t-2)28=\xa0(t2\xa0- (t-2)2\xa08= 4t-4t=3substituting t in equation 1h= 5x 3 x 3= 45 mHeight of tower = 45 m\xa0 | |
| 5193. |
How can we know that we have to use integration or differentation? |
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| 5194. |
What is centrifeugal force.? |
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Answer» Centrifugal force is defined as, “The apparent force, equal and opposite to the centripetal force, drawing a rotating body away from the center of rotation, caused by the inertia of the body A force, arising from the body\'s inertia, which appears to act on a body moving in a circular path and is directed away from the centre around which the body is moving. |
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| 5195. |
A particle start moving from rest state along a\xa0 |
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| 5196. |
Show that vectors A and B are parallel to each other? |
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| 5197. |
Show that vector A=i^–5j^ and vector B=2i^–10j^ are parallel to each other.\xa0 |
| Answer» If the angle between these vector is zero. | |
| 5198. |
A police van moving on a high eay |
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| 5199. |
What is dimensional formula..? |
| Answer» Dimensional Formula\xa0of physical quantity in Physics means a expression that shows how & which of the fundamental quantities are involved and what are their dimensions. For example --\xa0Dimensional Formula\xa0of Speed is [M0, L, T -1]. | |
| 5200. |
Why 2nd Law of motion known to be real Law? |
| Answer» Newton\'s second law is the real law of motion in the sense that the firest and third law of motion can be derived from the 2nd law of motion.\xa0From Newton’s 2nd\xa0law, F = maIf F = 0, then a = 0This means that if no force is applied on the body, its acceleration will be zero. If the body is at rest, it will remain in the state of rest and if it is moving, it will remain moving in the same direction with the same speed. Thus, a body not acted upon by an external force, does not change its state of rest or motion. This is the statement of Newton’s first law of motion.Also the 3\xa0rd\xa0law of motion can be derived from the 2nd law.Consider an isolated system of two bodies A and B. An isolated system is such that no force acts on the system.This is the Newton’s third law of motion for a body exerting some force on another.Thus, Newton’s 2\xa0nd\xa0law of motion is the most basic law of motion. | |