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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.
| 5051. |
What is vector and scaler quantity |
| Answer» Vetor which has both magnitude and directionScaler which has only magnitude | |
| 5052. |
What is the meaning of coefficient of kinetic and static force |
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| 5053. |
Scaler product addition |
| Answer» (Vector)A . (Vector)B = (mod)A + (mod)B cos x | |
| 5054. |
Explain the momentum conservation during explotion |
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| 5055. |
Concept of constrained motion |
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| 5056. |
Plz can u a question paper of combo of chapter 1 2 3 n 4 of physics |
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| 5057. |
Tell the dimension formula of planks constant |
| Answer» Dimensional Formula of Planck\'s constant = M1L2T-1\xa0SI unit of Planck\'s constant is joule-seconds (j-s) | |
| 5058. |
Find the cross product a=2i+3j+k & b= I-j+2k |
| Answer» {tex}\\eqalign{ & {\\rm{Here,}}\\vec a = 2\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over i} + 3\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over j} + \\hat k \\cr & {\\rm{ }}\\vec b = \\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over i} - \\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over j} + 2\\hat k \\cr & {\\rm{ \\vec a \\times \\vec b = }}\\left| {\\matrix{ {\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over i} } & {\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over j} } & {\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over k} } \\cr 2 & 3 & 1 \\cr 1 & { - 1} & 2 \\cr } } \\right| \\cr & = \\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over i} \\left[ {3 \\times 2 - 1 \\times ( - 1)} \\right] - \\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over j} \\left[ {2 \\times 2 - 1 \\times (1)} \\right] + \\hat k\\left[ {2 \\times ( - 1) - 3 \\times 1} \\right] \\cr & = 7\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over i} - 3\\mathord{\\buildrel{\\lower3pt\\hbox{$\\scriptscriptstyle\\frown$}}\\over j} - 5\\hat k \\cr} {/tex} | |
| 5059. |
What is the% error in volume of a sphere when error in measuring its radius is 2% |
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| 5060. |
What is projectile motion? Give its derivations . |
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| 5061. |
what is vector?\xa0 |
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| 5062. |
Q. Difference between x-t curve and v-t curve?\xa0Q. Can x-t curve give acceleration graph?\xa0 |
| Answer» x-t curve gives the position time graph which tells the posistion of the body at any instant. The derviative or slope of the tangent to the curve on x-t curve gives velocity at that instant. On\xa0v-t cuve similarily if tangent is drawn at a point acceleration at that instant will be the slope of the tangent drawn at that point.x-t curve cannot give acceleration graph however the slopes at two points on the graph gives speed at two different times. From this avg acceleration can be calculated.For acceleration graph, acceleration at all instants needs to be claculated.Slope at t1 and t2 be v1 and v2\xa0Then acceleration between these two periods is (v2 -v1)\xa0/(t2-t1) | |
| 5063. |
Three dimensional force how to prove?\xa0 |
| Answer» check\xa0{tex}{d^2}y\\over dt^2{/tex}, {tex}{d^2}z \\over dt^2{/tex},and {tex}{d^2}x \\over dt^2{/tex}\xa0i.e check for magnitude of acceleration in three directionsif any two of them is non zero and third one is zero then force is two dimesnionalif three of them are non zeros its three dimensionalif all are zero then no force exists | |
| 5064. |
Two dimensional force how to prove?\xa0 |
| Answer» check\xa0{tex}{d^2}y\\over dt^2{/tex}, {tex}{d^2}z \\over dt^2{/tex},and {tex}{d^2}x \\over dt^2{/tex}\xa0i.e check for magnitude of acceleration in three directionsif any two of them is non zero and third one is zero then force is two dimesnionalif three of them are non zeros its three dimensionalif all are zero then no force exists | |
| 5065. |
one dimensional force how to prove?\xa0 |
| Answer» check\xa0{tex}{d^2}y\\over dt^2{/tex}, {tex}{d^2}z \\over dt^2{/tex},and {tex}{d^2}x \\over dt^2{/tex}\xa0i.e check for magnitude of acceleration in three directionsif any two of them is non zero and third one is zero then force is two dimesnionalif three of them are non zeros its three dimensionalif only one is non zero and all others zero its one dimensionalif all are zero then no force exists | |
| 5066. |
If Force = 500 - 100t then impulse as a function of time will be |
| Answer» Force = 500- 100tImpulse( as a function of time) =\xa0{tex}dF\\over dt{/tex} =\xa0{tex}d(500-100t)\\over dt{/tex} = -100 | |
| 5067. |
Prove E=mc2 by derivation\xa0 |
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| 5068. |
The resistance R=VI where V=100V+/-5V and I=10A+/-0.2A.find the percentage error in R. |
| Answer» Here,\xa0{tex}V = 100 \\pm 5V{/tex}and\xa0{tex}I = 10 \\pm 0.2A{/tex}Expressing limits of error as percentage error, we have{tex}V = 100V \\pm \\frac{5}{{100}} \\times 100 = 100V \\pm 5\\% {/tex}{tex}I = 10A \\pm \\frac{{0.2}}{{100}} \\times 100 = 10A \\pm 2\\% {/tex}Now,{tex}R = \\frac{V}{I}{/tex}{tex}\\therefore{/tex}% error in R=%error in V + % error in I=5%+2%=7%{tex}\\therefore{/tex}% error in R=7%\xa0 | |
| 5069. |
1.What are polar and axial vectors?Give examples of each if possible. |
| Answer» In physics, a polar vector is a vector such as the radius vector r that reverses sign when the coordinate axes are reversed. Polar vectors are the type of vector usually simply known as "vectors." In contrast, pseudovectors (also called axial vectors) do not reverse sign when the coordinate axes are reversed. Examples of polar vectors include r, the velocity vector v, momentum p, and force F. The cross product of two polar vectors is a pseudovector | |
| 5070. |
How theory and experiment go hand in hand in physics and help each other\'s progress |
| Answer» Every experiment, calculation, result and prediction starts and ends with theory. Theory and experiment go hand in hand.Theory makes predictions and motivate experiments. Experimental results are used to update, improve and validate the framework that scientists work within.The models are reassessed under the light of the new data. The new information then comes full circle by helping to determine which experiments are conducted next. By knowing where the gaps in knowledge are – where theory needs more information – scientists can better decide which questions to ask and which experiments to run next. | |
| 5071. |
What is scope of physics and exitement???\xa0 |
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| 5072. |
What is hypothesis, axiom and models |
| Answer» \tA hypothesis is a supposition without assuming that it is true. It would not fair to ask anybody to prove the universal law of gravitation, because it cannot be proved. It can be verified by experiments.\tAn Axiom is self-evident truth\t\xa0A Model is a theory proposed to explain observed phenomena. | |
| 5073. |
What is theory? And its example..\xa0 |
| Answer» Theory is a set of statements or principles devised to explain a group of facts or phenomena.Most theories that are accepted by scientists have been repeatedly tested by experiments and can be used to make predictions about natural phenomena. | |
| 5074. |
Tell me any project based on the laws of motion\xa0 |
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| 5075. |
\tExplain SONAR method to find the distance of submarines in sea. ? |
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| 5076. |
\tWhat do you mean by significant figures? Discuss their rules also. |
| Answer» Significant figures indicate the precision of measurement of a physical quantity which depends on the least count of the measuring instrument.\xa0The basic ruled are :1) All the non-zero digits are significant.\xa02) All the zeros b/w two non-zero digits are significant, irrespective of the location of the decimal point.\xa03) If the number is less than 1, all the zeros on the right of decimal point but to the left of the first non-zero digit are not significant.\xa04) The terminal zero in a number, greater than 1, without a decimal point are not significant.\xa05) If the number is greater than 1,all the trailing zero in a number with a decimal point are significant.\xa0 | |
| 5077. |
\tWhat is gravitational and inertial mass. How will you determine the inertial mass? |
| Answer» The inertial mass of an object is the basic property of the object that determines its response to a push or a pull or any external force, governed by Newton\'s second law of motion.\xa0Thus, the inertia of matter can be used to measure the inertial mass of the object.\xa0Gravitational mass is the characteristics of the object that determine its response to the gravitational force by which the object is pulled towards the centre of the Earth.\xa0 | |
| 5078. |
\tWhat are errors? Explain two types of error. |
| Answer» The result of all the measurements is an approximate number that contains some uncertainty, called Error in it.\xa0We have Systematic errors that tend to be in one direction, either positive or negative. Causes of Systematic errors are instrumental errors, imperfection in experimental techniques etc.\xa0\xa0The other type of errors are random errors that may arise due to unpredictable fluctuations and variations in experimental conditions during the conduct of the experiment.\xa0 | |
| 5079. |
\tWhat is the technique used for measuring the time intervals. ? |
| Answer» In view of the tremendous accuracy required in time measurements and to meet the need for an improved and more precise standard of time, atomic clocks have been developed.\xa0 | |
| 5080. |
\tWhich type of method is most suitable to measure the time? |
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| 5081. |
\tExplain RADAR. |
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| 5082. |
\tWhat is error? Explain. |
| Answer» An error may be defined as the difference between the measured value and the actual value. For example, if the two operators use the same device or instrument for finding the errors in measurement, it is not necessary that they may get the similar results. There may be a difference between both measurements. The difference that occurs between both the measurements is referred to as an ERROR. | |
| 5083. |
Convert 25 joule into erg.? |
| Answer» 1 Joule = 107\xa0erg25 Joule = 25 × 107\xa0erg = 2.5 × 108 erg | |
| 5084. |
\tIf x = a+bt+ct2 where x is in meter and t in seconds, write the unit of a, b, c,? |
| Answer» a---[L]b----[LT-1]C--[LT-2] | |
| 5085. |
\tDo A.U. and å stand for the same unit? Explain. |
| Answer» \tAstronomical Unit(a.u): A unit of measurement equal to 149.6 million kilometres, the mean distance from the centre of the earth to the centre of the sun.\tAngstrom Å ; A unit of length equal to one hundred-millionth of a centimetre, 10−10 metre, used mainly to express wavelengths and interatomic distances. | |
| 5086. |
\tWhy other methods to measure the time is replaced by cesium atom clock.? |
| Answer» The efficient cesium atomic clocks are very accurate enough and such tremendous accuracy by the cesium atomic clocks are able to provide portable time measurement standard.\xa0 | |
| 5087. |
\tIf x in meter and t in second for the given equation x = at+bt2 ,dimensions of ‘a’ is……?\t\xa0 |
|
Answer» [a]=M0L1T-1[b]=M\u200b\u200b\u200b\u200b\u200b0L1T-2 [a]=M0L1T-1 |
|
| 5088. |
\tThe dimensions formula of tension is …..? |
| Answer» Tension is as same as force. So dimensional formula for tension and force is MLT-2.\xa0 | |
| 5089. |
\tThe surface tension of water is 72dync/cm. the value in S.I. unit………….? |
| Answer» The surface tension of water is 72 dync/cm. the value in S.I. unit is72 × 10-3\xa0N/m | |
| 5090. |
\tThe dimensions formula of pressure is …..? |
| Answer» ML-1T-2 | |
| 5091. |
the mass of the earth is.? |
| Answer» 5.972 × 10^24 kg | |
| 5092. |
the dimensions of surface tension is....? |
| Answer» MT^-2 | |
| 5093. |
\tA quantity has dimensions. Is it necessary it must have a unit? |
| Answer» Yes it is necessary. | |
| 5094. |
\tWhat is principal of homogeneity in dimensional method? |
| Answer» Principle of homogenity of dimensions states that “For an equation to be dimansionally correct, the dimensions of each term on LHS must be equal to the dimensions of each term on RHS.” | |
| 5095. |
\tA proton has a charge of ............? |
| Answer» A proton has positive charge of 1, that is, equal but opposite to the charge of an electron. | |
| 5096. |
\tThe dimension equation is [M0L0T-1] .The physical quantity associated is...........? |
| Answer» Frequency is associated with this dimensional equation.Frequency =\xa0{tex}1\\over Time \\space Period {/tex} | |
| 5097. |
23. Three physical quantities having same dimensions are..............? |
| Answer» Three physical quantities having same dimensions can be Work, Kinetic Energy and Potential Energy as all of them have dimensions [M1L2T-2]. | |
| 5098. |
What is the atomic mass unit (a.m.u.) ? |
| Answer» Atomic mass unit is defined as the mass equal to exactly one -twelfth (1/12th) of the mass of an atom of carbon- 12. | |
| 5099. |
Name the error associated with the resolution of the instrument ? |
| Answer» The least count error is the\xa0error associated with the resolution of the instrument.For example, a metre rod can measure length accurately up to 0.1 cm, whereas vernier callipers can measure length accurately up to 0.01 cm | |
| 5100. |
What is the responsibility of national physical laboratory (NPL) ? |
| Answer» National Physical Laboratory has the responsibility of realising the units of physical measurements based on the International System (SI units) also to realise, establish, maintain, reproduce and update the national standards of measurement & calibration facilities for different parameters. | |