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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.
| 9101. |
What is frame reference |
| Answer» a frame of reference (or reference frame)consists of an abstract coordinate system and the set of physical reference points that uniquely fix (locate and orient) the coordinate system and standardize measurements. | |
| 9102. |
How speed of light calculated |
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Answer» The speed of light in a vacuum is 186,282 miles per second (299,792 kilometers per second), and in theory nothing can travel faster than light. In miles per hour, light speed is, well, a lot: about 670,616,629 mph. If you could travel at the speed of light, you could go around the Earth 7.5 times in one second.Early scientists, unable to perceive light’s motion, thought it must travel instantaneously. Over time, however, measurements of the motion of these wave-like particles became more and more precise. Thanks to the work of Albert Einstein and others, we now understand light speed to be a theoretical limit: light speed — a constant called "c" — is thought to be not acheivable by anything with mass, for reasons explained below. That doesn’t stop sci-fi writers, and even some very serious scientists, from imagining alternative theories that would allow for some awfully fast trips around the universe. Us book me ye 3 ke bare me parhna hai Léon Foucault used an experiment which used rotating mirrors to obtain a value of 298,000,000 m/s in 1862. Albert A. Michelson conducted experiments on the speed of light from 1877 until his death in 1931. He refined Foucault\'s methods in 1926 using improved rotating mirrors to measure the time it took light to make a round trip from Mt. Wilson to Mt. San Antonio in California. The precise measurements yielded a speed of 299,796,000 m/s. more accurate, measurement of the speed of light was performed in Europe by Hippolyte Fizeau in 1849. Fizeau directed a beam of light at a mirror several kilometers away. A rotating cog wheel was placed in the path of the light beam as it traveled from the source, to the mirror and then returned to its origin. Fizeau found that at a certain rate of rotation, the beam would pass through one gap in the wheel on the way out and the next gap on the way back. Knowing the distance to the mirror, the number of teeth on the wheel, and the rate of rotation, Fizeau was able to calculate the speed of light as 313,000,000 m/s. Galileo attempted to measure the speed of light in the seventeenth century. An early experiment to measure the speed of light was conducted by Ole Rømer, a Danish physicist, in 1676. Using a telescope, Ole observed the motions of Jupiter and one of its moons, Io. Noting discrepancies in the apparent period of Io\'s orbit, Rømer calculated that light takes about 22 minutes to traverse the diameter of Earth\'s orbit.[4] Unfortunately, its size was not known at that time. If Ole had known the diameter of the Earth\'s orbit, he would have calculated a speed of 227,000,000 m/s |
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| 9103. |
How is speed of light calculated?(give the experiment) |
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Answer» Bhai me commerce student hu Iwill try Last chapter from concepts of physics part 1 Kya samaj me ayega bina parhe sahi bola yr Koi nhi parha hoga sayad se 3 experiment diya hai Bhai last chapter parh ke dekh le Gjb ka question hi i too want ans |
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| 9104. |
What is the conservation of linear moment |
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| 9105. |
Dimensional formula of calorie is ML2T-2 . what is si unit of M,L,T |
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Answer» The SI unit of M,L,T is kg metre squre per second squre S. I. Unit is M for kilogram, L for metre, T for second M- mass L- lenghtT- time |
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| 9106. |
Briefly explain the working of hydraulic lift |
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| 9107. |
If a=-i,+j+k ,b=2i+3j+5k , then find sine of angle between a and b |
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| 9108. |
Relation between protons neutrons and electrons |
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Answer» I think relation may be atomic no. Equal proton equal electron and atomic mass minus atomic no. Equal neutron Sorry in this ans has some mistake right ans is all threes are made up by a atom nd the charge of electron and proton are exactly same but these are opposite nd then opposite charge attract protons and elctrons All threes are made up by a atom nd proton nd elctron have same charge but these are opposite nd proton and neutron are making up the nucleus |
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| 9109. |
Derivation of kinematics eq four ...... |
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| 9110. |
Check the correction of given equation using dimensions v=πpr4÷8√l |
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| 9111. |
what are causes of rooling friction |
| Answer» Hlo | |
| 9112. |
Kya class 12 ka syllabus session 2019 20 ke liye half hoga |
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Answer» Aapka 11th ka exam ho gya kya jo 12th ke bare m sochre ho... Is it informed in news? Might be Yes , confirmed May be! I m not sure about this |
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| 9113. |
3.0m/s-2=km min-3 |
| Answer» 6.48×102km min- 3 | |
| 9114. |
What is 300*0.5 in significant figures |
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| 9115. |
Write the principle behind electron 2 |
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| 9116. |
X-axis = cosα or y-axis =cosα??? |
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| 9117. |
Calculate the angle of 1degree, 1minute of arc, 1 second in radians |
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Answer» (3661/3600)×pi/180 1°+1/60°+1/(60×60)=(3600+60+1)/3600=3661/3600 |
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| 9118. |
What is the conservation force |
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| 9119. |
Velocity of sound wave in a gas depend on its pressure and density derive relation |
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| 9120. |
I will able to study physics without any tution in class 11th. Is it true or false. |
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Answer» It depends on u....,hardworking will make it possible You should prefer tuition I also study physics without any tution I recomend to do tution! If i want to boom ur marks How ishika it depends on u |
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| 9121. |
What is dot product and explain its 5 properties |
| Answer» Dot product is =to the product of their magnitude and cosine of smaller angle between them .it is also known as scalor product. | |
| 9122. |
Motoon in a plane |
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| 9123. |
What is the difference between sclar and vevtor |
| Answer» Scalar:- Quantity having magnitude only.Vector:- Quantity having magnitude as well as direction also. | |
| 9124. |
Retardetion in velocity time graph |
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Answer» Retardation means negative acceleration(rate of change of velocity). Retardation is negative aceleration. When the velocity of a body decreases unifomly. |
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| 9125. |
How to learn dimensional formula |
| Answer» You dont need to learn the dim. formulae.... But u should know how to derive them......Some dim. Formulae are so basic that they are used in derivation of other formluae... Those automatically are memorized... But all you need to do is practice and practice...So dear practice hard.... No cramming..... You will memorize them yourself with time to time practice and revision? | |
| 9126. |
A car miving half of speed 36 km/h and next half is 54km/h find average speed and average velocity |
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| 9127. |
Derive the 3rd equation of motion by graphical method |
| Answer» how can we derive it here???? | |
| 9128. |
What is aerial magnfication |
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| 9129. |
Projectile fired parallel to horizontal |
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| 9130. |
Hey guy\'s ??...here my question ?Define law of friction? ▪☆ |
| Answer» When an object is moving the friction is proportional and perpendicular to the normal force . Friction is independent of the area of contract so long as there is an area of contract. | |
| 9131. |
Physics k numerical k liye kon sa channel best rahega ? |
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Answer» Arey channel ka naam batao book ka nhi Hc verma |
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| 9132. |
The angle between the vector (i+j) and (j+k) is: |
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Answer» Because (i+i)and (j+j) made angle 0° Cos 90° |
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| 9133. |
Lower limit 1 uperlimit 2 integral ( x sqr + 2x ) dx |
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| 9134. |
Find the value of 100J on a system which has 20 CM 250g and 30sec as fundamental units |
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| 9135. |
Important topics of ch 1and 2 of physics |
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Answer» In ch 2 projectile and centripetal acceleration is very very very important ☺☺Dimension of different given quantity, application of dimension, homogenity of dimension, errors, rounding of significant figure, least count, varneir calliper, screw gauge, combination of error, sum, difference, product, division.☺☺I know only about first chapter. These topics are most important for Jee exam. Trust me. |
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| 9136. |
What is a parallex method?how to calculate from it |
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Answer» Parallex is the apparent shift in the position of an object with respect to another when we shift our eye sight wise. Φ=arc/radius Large distance such as distanceof planet, distance of star cannot be measured by metre scale then we use Parallax method. θ=b/d |
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| 9137. |
Derive an expression for dipole in equitorial line |
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| 9138. |
List the important questions in chapter2. |
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Answer» Kyo ki es exercise m bahut sare questions hai. esliye important question suggest karo.( I hope you understand my problem) Maine exercise m se puchaa hai I think most important question will be ask from the topic dimensions and error.. because this chapter only contains 3 marks. In textbook exercise |
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| 9139. |
Displacement is given by x=1+2t+3t². Find the value of Instantaneous accleration |
| Answer» 6 do double differentiation first one will give velocity and second acceleration | |
| 9140. |
Bernonils theorem? |
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| 9141. |
How the stars twinkle |
| Answer» Stars twinkle due to atmospheric refraction | |
| 9142. |
what is velocity ,acceleration |
| Answer» Rate of change of displacement with respect to time is known as velocity. Rate of change of velocity with respect to time is known as acceleration. | |
| 9143. |
With positive value of acceleration must be speeding up.true/false |
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Answer» But i am not satisfied from answer please eplain it False. Example acceleration due to gravity. True |
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| 9144. |
Show that Newton\'s second law is real law of motion |
| Answer» It can be verified by using Newton\'s First law of motion. | |
| 9145. |
Explain parallax method.. |
| Answer» Use the formular of radian and steradian you can solve any parallax type question. | |
| 9146. |
What is the vector |
| Answer» Vector which have both direction and magnitude also which can be added to vector law of addition. Ex: acceleration, displacement, velocity etc. Here current is exceptional case. | |
| 9147. |
Who are from sangam Vihar New Delhi 80 |
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| 9148. |
What is atomic and molecular and nuclear scales |
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| 9149. |
Current is vector or scaler |
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Answer» We consider current to be a tensor quantity Current is a scalar because it didnt obey vector law of addition but it have both magnitude and direction Reason???? Current is scalor |
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| 9150. |
Define intergartion |
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Answer» Thnaks Integration is the reverse process of differentiation. It is the process of finding a function whose derivative is given |
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