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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.
| 37501. |
A bullet fired into a fixed target loses half of its velocity in penetrating 15 cm. How much further it will penetrate before coming to rest? |
| Answer» <html><body><p>5cm<br/>15cm<br/>7.5cm<br/>10cm</p>Answer :A</body></html> | |
| 37502. |
What is the orbital radius of a geo-stationary satellite? What is the height from the surface of the earth ? |
| Answer» <html><body><p></p>Solution :Orbital radius of a geo-stationary <a href="https://interviewquestions.tuteehub.com/tag/satellite-1195060" style="font-weight:bold;" target="_blank" title="Click to know more about SATELLITE">SATELLITE</a> is <a href="https://interviewquestions.tuteehub.com/tag/42-316129" style="font-weight:bold;" target="_blank" title="Click to know more about 42">42</a>, <a href="https://interviewquestions.tuteehub.com/tag/250-297421" style="font-weight:bold;" target="_blank" title="Click to know more about 250">250</a> km. Its height above the <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a> of the earth is nearly 35,800km.</body></html> | |
| 37503. |
The point where the entire weight of the body acts is called as |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/center-11455" style="font-weight:bold;" target="_blank" title="Click to know more about CENTER">CENTER</a> of <a href="https://interviewquestions.tuteehub.com/tag/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a> <br/>center of gravity<br/>both (a) and (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>)<br/><a href="https://interviewquestions.tuteehub.com/tag/pivot-1155159" style="font-weight:bold;" target="_blank" title="Click to know more about PIVOT">PIVOT</a> </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :B</body></html> | |
| 37504. |
A smooth tunnel is dug along the radius of the earth that ends at the centre of earth. A ball is released from the surface of earth along the coefficient of restitiution is 0.2 between the end of tunnel and ball then the total distancetravelled by the ball second collision at the centre of earth is |
| Answer» <html><body><p>`(6)/(5)<a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a>` <br/>`(<a href="https://interviewquestions.tuteehub.com/tag/7-332378" style="font-weight:bold;" target="_blank" title="Click to know more about 7">7</a>)/(5)`R <br/>`(<a href="https://interviewquestions.tuteehub.com/tag/9-340408" style="font-weight:bold;" target="_blank" title="Click to know more about 9">9</a>)/(5)`R <br/>`(3)/(2)` R </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 37505. |
A box of mass 8 kg ios placed on a roulgh inclined plane of inclination 30^(@) Its downward motion cn be prevented byu applying a horizontal force F, then value of F for which friction between the block and the incline surface is minimum is |
| Answer» <html><body><p>`80/sqrt(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)`<br/>`40sqrt(3)`<br/>`40/sqrt(3)`<br/>`80sqrt(3)`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 37506. |
Give one example each of central force and non-central force. |
| Answer» <html><body><p></p>Solution :`implies`For <a href="https://interviewquestions.tuteehub.com/tag/central-407816" style="font-weight:bold;" target="_blank" title="Click to know more about CENTRAL">CENTRAL</a> force : Gravitational force, electrostatic force. <br/> For non-central force : <a href="https://interviewquestions.tuteehub.com/tag/nuclear-2474" style="font-weight:bold;" target="_blank" title="Click to know more about NUCLEAR">NUCLEAR</a> force, magnetic force acting between two current <a href="https://interviewquestions.tuteehub.com/tag/carrying-909956" style="font-weight:bold;" target="_blank" title="Click to know more about CARRYING">CARRYING</a> <a href="https://interviewquestions.tuteehub.com/tag/loops-11554" style="font-weight:bold;" target="_blank" title="Click to know more about LOOPS">LOOPS</a>.</body></html> | |
| 37507. |
The kinetic energy of a given sample of an ideal gas depends only on its |
| Answer» <html><body><p>Volume<br/>Pressure<br/>Density<br/>Temperature</p>Answer :D</body></html> | |
| 37508. |
A given of gas occupies a volume of 100 c.c at one atmospheric and at 100^(@)C. At the same temperature, how much volume the same gas occupies at 4 atmospheric pressure ? |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/25-296426" style="font-weight:bold;" target="_blank" title="Click to know more about 25">25</a> c.c</body></html> | |
| 37509. |
The kinetic theory of gases gives the formula PV=(1)/(3)Nmv^(bar2) for the pressure P exerted by a gas enclosed in a voluem V. The term Nm represents |
| Answer» <html><body><p>the mass of a mole of the <a href="https://interviewquestions.tuteehub.com/tag/gas-1003521" style="font-weight:bold;" target="_blank" title="Click to know more about GAS">GAS</a><br/>the mass of the gas <a href="https://interviewquestions.tuteehub.com/tag/present-1163722" style="font-weight:bold;" target="_blank" title="Click to know more about PRESENT">PRESENT</a> in the volume V<br/>the average mass of one <a href="https://interviewquestions.tuteehub.com/tag/molecule-563028" style="font-weight:bold;" target="_blank" title="Click to know more about MOLECULE">MOLECULE</a> of the gas<br/>the total number of molecules present in volume V</p>Answer :B</body></html> | |
| 37510. |
A man is moving with a constant velocity along a line parallel to X-axis away from the origin. Its angular momentum w.r.t origin is [Hint : L = mv times r = constant, as m, v and r are constants] |
| Answer» <html><body><p>Zero<br/>constant<br/><a href="https://interviewquestions.tuteehub.com/tag/goes-2676180" style="font-weight:bold;" target="_blank" title="Click to know more about GOES">GOES</a> on <a href="https://interviewquestions.tuteehub.com/tag/increasing-1040633" style="font-weight:bold;" target="_blank" title="Click to know more about INCREASING">INCREASING</a><br/> goes on decreasing</p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 37511. |
The motion of a body falling from rest in a resisting medium is described by the equation (dv)/(dt)= a-bv where a and b are constants . The velocity at any time t is given by |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a> = a/b(1-<a href="https://interviewquestions.tuteehub.com/tag/e-444102" style="font-weight:bold;" target="_blank" title="Click to know more about E">E</a>^(<a href="https://interviewquestions.tuteehub.com/tag/bt-391324" style="font-weight:bold;" target="_blank" title="Click to know more about BT">BT</a>))`<br/>`v = b/a (e^(bt))`<br/>`v=a/b (1+e^(bt))`<br/>`v=b/a e^(bt)`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :A</body></html> | |
| 37512. |
Specific heat of oxygen at a constant pressure is 0.2174 kcal/kg K. If the ratio of its specific heat is 1.4,find the universal gas constant given that J=4200J/kcal and molecular weight of oxygen is 32. |
| Answer» <html><body><p></p>Solution :We have seen that `C_(p)=(gammaR)/(gamma-1)` <br/> `C_(p)`=<a href="https://interviewquestions.tuteehub.com/tag/molar-562965" style="font-weight:bold;" target="_blank" title="Click to know more about MOLAR">MOLAR</a> heat capacity at constant pressure=Principal specific heat at constant pressure `<a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a>` Molecular weight. <br/> As specific heat of <a href="https://interviewquestions.tuteehub.com/tag/oxygen-1144542" style="font-weight:bold;" target="_blank" title="Click to know more about OXYGEN">OXYGEN</a> at constant pressure is given on kcal//kg K. we have to convert it into J/kg K <br/> `C_(p)=0.2174xx4200xx32 J/"Kmole"` <br/> `K=(gammaR)/(gamma-1) = (1.4R)/((1.4-1))` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a>=(0.2174xx4200xx32xx0.4)/(1.4) = 8348J/"kmoleK"` .</body></html> | |
| 37513. |
A family uses 8 kW of power. Compare this area to that of the roof of a typical house. |
| Answer» <html><body><p></p>Solution :comparable to the roof of a large house jjof <a href="https://interviewquestions.tuteehub.com/tag/dimension-954106" style="font-weight:bold;" target="_blank" title="Click to know more about DIMENSION">DIMENSION</a> `<a href="https://interviewquestions.tuteehub.com/tag/14m-273942" style="font-weight:bold;" target="_blank" title="Click to know more about 14M">14M</a> xx 14m`.</body></html> | |
| 37514. |
The width of a river is 2sqrt(3) km. A boat is rowed in direction perpendicular to the banks of river. If the drift of the boat due to flow is 2km, the displacement of the boat is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a> km<br/>6 km<br/>5 km<br/>4 km</p>Answer :D</body></html> | |
| 37515. |
A bullet of mass 10 g and speed 500 m/s is fired into a door and gets embedded exactly at the centre of the door. The door is 1.0 m wide and weighs 12 kg. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embeds into it. |
| Answer» <html><body><p><br/></p>Solution :The moment of inertia of the <a href="https://interviewquestions.tuteehub.com/tag/door-958364" style="font-weight:bold;" target="_blank" title="Click to know more about DOOR">DOOR</a> about the <a href="https://interviewquestions.tuteehub.com/tag/vertical-726181" style="font-weight:bold;" target="_blank" title="Click to know more about VERTICAL">VERTICAL</a> axis at <a href="https://interviewquestions.tuteehub.com/tag/one-585732" style="font-weight:bold;" target="_blank" title="Click to know more about ONE">ONE</a> <a href="https://interviewquestions.tuteehub.com/tag/end-971042" style="font-weight:bold;" target="_blank" title="Click to know more about END">END</a> is `ML^(2)//<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>`. <br/></body></html> | |
| 37516. |
At what depth below the surface of the earth, acceleration due to gravity g will be half its value 1600 km above the surface of the earth ? |
| Answer» <html><body><p>`4.2 <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> <a href="https://interviewquestions.tuteehub.com/tag/10-261113" style="font-weight:bold;" target="_blank" title="Click to know more about 10">10</a>^(<a href="https://interviewquestions.tuteehub.com/tag/6-327005" style="font-weight:bold;" target="_blank" title="Click to know more about 6">6</a>)` m<br/>`3.19 xx 10^(6)`m<br/>`1.59 xx 10^(6)` m<br/>None of the above </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :A</body></html> | |
| 37517. |
A graph of potential energy V(x) verses x is shown in figure .A particle of energy E_(0) is executing motion in it . Draw graph of velocity and kinetic energy verses x for one complete cycleAFA. |
| Answer» <html><body><p></p>Solution :We <a href="https://interviewquestions.tuteehub.com/tag/know-534065" style="font-weight:bold;" target="_blank" title="Click to know more about KNOW">KNOW</a> that<br/> Total `E = K +U ` <br/> `E = K+V(x) "" ( :. U = V(x))` <br/> `K = E_(0)-V(x) "" ( :. E =E_(0))` <br/> at A , x = 0 ,V(x) = `E_(0)` <br/> ` :.K =E_(0)-E_(0)=0` <br/> at B , `V(x) lt E_(0)` <br/> ` :. K =E_(0)` (Maximum) <br/> K=0 <br/> At F, <br/> the variation is as below , <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P1_C06_E04_034_S01.png" width="80%"/> <br/> <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> versus x graph : <br/> As `KE =1/2 mv^(2)` <br/> ` :. ` At A and F , where KE = 0 , v = 0 <br/> At C and d , KE is maximum .Therefore , v is `<a href="https://interviewquestions.tuteehub.com/tag/pm-1156895" style="font-weight:bold;" target="_blank" title="Click to know more about PM">PM</a>` <a href="https://interviewquestions.tuteehub.com/tag/max-546895" style="font-weight:bold;" target="_blank" title="Click to know more about MAX">MAX</a> . <br/> At B . KE is positive but not maximum . <br/> Therefore , v is `pm ` some value ( `lt` max) <br/> The variation is shown in the <a href="https://interviewquestions.tuteehub.com/tag/diagram-950736" style="font-weight:bold;" target="_blank" title="Click to know more about DIAGRAM">DIAGRAM</a> . <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P1_C06_E04_034_S02.png" width="80%"/></body></html> | |
| 37518. |
Suppose there existed a planet that went around the Sun twice as fast as the earth. What would be its orbital size as compared to that of the earth ? |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :<a href="https://interviewquestions.tuteehub.com/tag/smaller-1213327" style="font-weight:bold;" target="_blank" title="Click to know more about SMALLER">SMALLER</a> by a <a href="https://interviewquestions.tuteehub.com/tag/factor-458892" style="font-weight:bold;" target="_blank" title="Click to know more about FACTOR">FACTOR</a> of 0.63.</body></html> | |
| 37519. |
The temperature of a gas is raise from 27^(@)C to 927^(@)C. The root mean squre speed of its molecules.............. . |
| Answer» <html><body><p>become`<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(927)/27` <a href="https://interviewquestions.tuteehub.com/tag/times-1420471" style="font-weight:bold;" target="_blank" title="Click to know more about TIMES">TIMES</a> the <a href="https://interviewquestions.tuteehub.com/tag/earlier-963550" style="font-weight:bold;" target="_blank" title="Click to know more about EARLIER">EARLIER</a> value<br/>gets halved<br/>remains the same<br/>gets doubled</p>Answer :A::<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>::C::D</body></html> | |
| 37520. |
Three identical spheres each of radius R are placed on a horizontal surface touching one another. If one of the spheres is removed, the shift in the centre of mass of the system is |
| Answer» <html><body><p>`R//2sqrt(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)`<br/>`R//2`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(3)R//2`<br/>`R//sqrt(3)`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :D</body></html> | |
| 37521. |
A uniform rod of density rho is placed in a wide tank containing a liquid of density rho_(0)(rho_(0)gtrho). The depth of liquid in the tank is half the length of the rod. The rod is in equilibrium, with its lower end resting on the bottom of the tank. In this position the rod makes an angle theta with the horizontal. Determine theta. |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :`<a href="https://interviewquestions.tuteehub.com/tag/sin-1208945" style="font-weight:bold;" target="_blank" title="Click to know more about SIN">SIN</a>^(-<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)(1/2sqrt(rho_(<a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>)/<a href="https://interviewquestions.tuteehub.com/tag/rho-623364" style="font-weight:bold;" target="_blank" title="Click to know more about RHO">RHO</a>))`</body></html> | |
| 37522. |
A man insidea moving train throwa a baoll verticallyupwards . How will the motion of ball appears to a stationary observe (a) inside the train and (b) outside the train? |
| Answer» <html><body><p></p>Solution :(a) With respect to stationary observe inside the train , ball has only one velocity component , along vertical. So, to him , the ball will <a href="https://interviewquestions.tuteehub.com/tag/appear-2437800" style="font-weight:bold;" target="_blank" title="Click to know more about APPEAR">APPEAR</a> to move straight , <a href="https://interviewquestions.tuteehub.com/tag/verticallyupwards-3260472" style="font-weight:bold;" target="_blank" title="Click to know more about VERTICALLYUPWARDS">VERTICALLYUPWARDS</a> and then downwards . <br/> (b) With respect to observe outside the train , the ball has both <a href="https://interviewquestions.tuteehub.com/tag/components-926700" style="font-weight:bold;" target="_blank" title="Click to know more about COMPONENTS">COMPONENTS</a> of velocity , horizontal and vertical. So, to him the ball will appear to move in a parabolic <a href="https://interviewquestions.tuteehub.com/tag/path-11833" style="font-weight:bold;" target="_blank" title="Click to know more about PATH">PATH</a> .</body></html> | |
| 37523. |
What happens in a eleastic collision of two identical bodies moving opposite to each other ? |
| Answer» <html><body><p></p>Solution :The direction of <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> of both <a href="https://interviewquestions.tuteehub.com/tag/bodies-900171" style="font-weight:bold;" target="_blank" title="Click to know more about BODIES">BODIES</a> <a href="https://interviewquestions.tuteehub.com/tag/becomes-1994370" style="font-weight:bold;" target="_blank" title="Click to know more about BECOMES">BECOMES</a> reverse and its values <a href="https://interviewquestions.tuteehub.com/tag/changes-913881" style="font-weight:bold;" target="_blank" title="Click to know more about CHANGES">CHANGES</a> .</body></html> | |
| 37524. |
A horse has to apply more forse to start a cart than to keep it moving. Why ? |
| Answer» <html><body><p></p>Solution :Since <a href="https://interviewquestions.tuteehub.com/tag/limiting-2791961" style="font-weight:bold;" target="_blank" title="Click to know more about LIMITING">LIMITING</a> friction is <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> than <a href="https://interviewquestions.tuteehub.com/tag/kinetic-533291" style="font-weight:bold;" target="_blank" title="Click to know more about KINETIC">KINETIC</a> friction.</body></html> | |
| 37525. |
A block of mass m is placed on a smooth sphere of radius R. It slides when pushed slightly. At what vertical distance h, from the top, will it leave the sphere? |
| Answer» <html><body><p>`(R)/(4)`<br/>`(R)/(3)`<br/>`(R )/(2) `<br/> `R`</p>Solution :<img src="https://doubtnut-static.s.llnwi.net/static/physics_images/MTG_NEET_GID_PHY_XI_C03_E01_142_S01.png" width="80%"/> <br/> Let the block leave the sphere at point B, which is at a distance h from the top of the sphere. <br/>`<a href="https://interviewquestions.tuteehub.com/tag/therefore-706901" style="font-weight:bold;" target="_blank" title="Click to know more about THEREFORE">THEREFORE</a>(mv^2)/( R ) =mg <a href="https://interviewquestions.tuteehub.com/tag/costheta-2550146" style="font-weight:bold;" target="_blank" title="Click to know more about COSTHETA">COSTHETA</a> -N` <br/>where N is the normal reaction and v is the velocity of block at point B. <br/>When the block leaves the sphere at point B, the normal reaction N becomes <a href="https://interviewquestions.tuteehub.com/tag/zero-751093" style="font-weight:bold;" target="_blank" title="Click to know more about ZERO">ZERO</a>. <br/>`therefore(mv^2)/( R )= mgcos thetaorcos theta =(v^2)/(Rg)` <br/> From figure,` cos theta = (R-h)/( R)` <br/>` therefore(R-h)/(R ) = (2 gh)/(Rg) "" [:.v= sqrt(2 gh)]` <br/>` orR-h =2hor 3h=Rorh=(R )/(3 )`</body></html> | |
| 37526. |
A balloon rases up with uniform velocity 'u'. A body is dropped from ballon. The time of descent for the body is given by is |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>((<a href="https://interviewquestions.tuteehub.com/tag/2h-300377" style="font-weight:bold;" target="_blank" title="Click to know more about 2H">2H</a>)/(g))`<br/>`h=ut+(1)/(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)g t^(2)`<br/>`h=-ut+(1)/(2)g t^(2)`<br/>`-h=ut+(1)/(2)g t^(2)`</p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html> | |
| 37527. |
State and explian Stefan - Boltzmann law. |
| Answer» <html><body><p></p>Solution :Stefan.s law states that the rate of emission or radiant energy by unit area of a perfectly <a href="https://interviewquestions.tuteehub.com/tag/black-898687" style="font-weight:bold;" target="_blank" title="Click to know more about BLACK">BLACK</a> <a href="https://interviewquestions.tuteehub.com/tag/body-900196" style="font-weight:bold;" target="_blank" title="Click to know more about BODY">BODY</a> is directly proportional to the fourth power of its absolute temperature.<br/>`i.e.,E prop T^(4) or E = <a href="https://interviewquestions.tuteehub.com/tag/sigma-1207107" style="font-weight:bold;" target="_blank" title="Click to know more about SIGMA">SIGMA</a> T^(4) `, where `sigma` isthe Stefan.s <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a>.<br/> If the body is not perfectly black and its emissivity or relative emittance is .e. then `E = e sigma T^(4)` .</body></html> | |
| 37528. |
If vecP + vecQ = vecR and vecP - vecQ = vecS, then R^(2) + S^(2) is equal to |
| Answer» <html><body><p><<a href="https://interviewquestions.tuteehub.com/tag/p-588962" style="font-weight:bold;" target="_blank" title="Click to know more about P">P</a>>`P^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>) + <a href="https://interviewquestions.tuteehub.com/tag/q-609558" style="font-weight:bold;" target="_blank" title="Click to know more about Q">Q</a>^(2)`<br/>`2(P^(2) - Q^(2))`<br/>`2(P^(2) + Q^(2))`<br/><a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a> PQ</p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html> | |
| 37529. |
A mass of 3 kg is attached at end of rope with 6 kg mass. At upper end of rope tension will be …... . |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/9-340408" style="font-weight:bold;" target="_blank" title="Click to know more about 9">9</a> <a href="https://interviewquestions.tuteehub.com/tag/kg-1063886" style="font-weight:bold;" target="_blank" title="Click to know more about KG">KG</a> `<a href="https://interviewquestions.tuteehub.com/tag/omegat-2889234" style="font-weight:bold;" target="_blank" title="Click to know more about OMEGAT">OMEGAT</a>`</body></html> | |
| 37530. |
What is the average distance between atoms (interatomic distance) in water? Use the data given in Examples 13.1 and 13.2. |
| Answer» <html><body><p></p>Solution :A given mass of <a href="https://interviewquestions.tuteehub.com/tag/water-1449333" style="font-weight:bold;" target="_blank" title="Click to know more about WATER">WATER</a> in vapour state has `1.67 xx <a href="https://interviewquestions.tuteehub.com/tag/10-261113" style="font-weight:bold;" target="_blank" title="Click to know more about 10">10</a>^(3)` <a href="https://interviewquestions.tuteehub.com/tag/times-1420471" style="font-weight:bold;" target="_blank" title="Click to know more about TIMES">TIMES</a> the volume of the same mass of water in liquid state . This is also the increase in the amount of volume available for each molecule of water. When volume <a href="https://interviewquestions.tuteehub.com/tag/increases-1040626" style="font-weight:bold;" target="_blank" title="Click to know more about INCREASES">INCREASES</a> by`10^(3)`times the radius increases by `V^(1//3)` or 10times, i.e., `10 xx 2 À = 20 Å`. So the average <a href="https://interviewquestions.tuteehub.com/tag/distance-116" style="font-weight:bold;" target="_blank" title="Click to know more about DISTANCE">DISTANCE</a> is `2 xx 20 = 40 Å`.</body></html> | |
| 37531. |
A glass tube of diameter 0.06cm is dipped in methyl alcohol. If angle of contact is 0^@ density ofmethyl alcohol 0.8 g cm^(-3) and surface tension 0.023 Nm^(-1), the height to which it rises in the tube is |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> <a href="https://interviewquestions.tuteehub.com/tag/cm-919986" style="font-weight:bold;" target="_blank" title="Click to know more about CM">CM</a></body></html> | |
| 37532. |
What are the answers to (a) and (b) for an inelastic collision ? |
| Answer» <html><body><p>Equal to10kJ<br/>Less than 10kJ<br/>More than 10kJ<br/> Zero<br/></p>Solution :For <a href="https://interviewquestions.tuteehub.com/tag/inelastic-7382420" style="font-weight:bold;" target="_blank" title="Click to know more about INELASTIC">INELASTIC</a> <a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> in (a) and (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) is <a href="https://interviewquestions.tuteehub.com/tag/unchanged-2316761" style="font-weight:bold;" target="_blank" title="Click to know more about UNCHANGED">UNCHANGED</a> .</body></html> | |
| 37533. |
In a hydraulic lift, the area of smaller piston is 5 cm^2. The weight raised by larger piston is 900 kgf, if a force of 150 kg fis applied on smaller piston. Calculate the area of larger piston. |
| Answer» <html><body><p></p>Solution :`a=<a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a> <a href="https://interviewquestions.tuteehub.com/tag/cm-919986" style="font-weight:bold;" target="_blank" title="Click to know more about CM">CM</a>^(2) =5 xx 10^(-4) m^(2)` <br/> f=150kgf `=150 xx 9.8 N`<br/> `F=<a href="https://interviewquestions.tuteehub.com/tag/900-341675" style="font-weight:bold;" target="_blank" title="Click to know more about 900">900</a> xx 9.8 N` <br/> As `f/a=F/A` <br/> `(150 xx 9.8)/(5 xx 10^(-4)) =(900) xx 9.8)/(A))` <br/> Solving we get `A=30 xx 10^(-4) m^(2)`</body></html> | |
| 37534. |
For a stationary wave y = 10 sin ((pi x )/(4)) cos (2pi t )metre, distance between two consecutive nodes is ...... m. |
| Answer» <html><body><p>4<br/>2<br/>1<br/>8</p>Solution :Comparing <a href="https://interviewquestions.tuteehub.com/tag/given-473447" style="font-weight:bold;" target="_blank" title="Click to know more about GIVEN">GIVEN</a> equation with `y = <a href="https://interviewquestions.tuteehub.com/tag/2a-300249" style="font-weight:bold;" target="_blank" title="Click to know more about 2A">2A</a> <a href="https://interviewquestions.tuteehub.com/tag/sin-1208945" style="font-weight:bold;" target="_blank" title="Click to know more about SIN">SIN</a> (kx) <a href="https://interviewquestions.tuteehub.com/tag/cos-935872" style="font-weight:bold;" target="_blank" title="Click to know more about COS">COS</a> (omega t), ` we get `k = (<a href="https://interviewquestions.tuteehub.com/tag/pi-600185" style="font-weight:bold;" target="_blank" title="Click to know more about PI">PI</a>)(4)` <br/> `therefore (2pi)/(lamda) = (pi)/(4) implies lamda = 8 m` <br/> Required distance `= (lamda)/(2) = (8)/(2) = 4 m`</body></html> | |
| 37535. |
A solid sphere rolls down two different inclined planes of the same heights but different angles of inclination. (a) Will it reach the bottom with the same speed in each case? (b) Will it take longer to roll down one plane than the other? (c ) If so, which one and why? |
| Answer» <html><body><p></p>Solution :(a) In figure two inclined planes AB and AC is shown with angle of inclination `theta_(1)andtheta_(2)` respectively and have equal height h. Here `theta_(1)gttheta_(2)`. <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P1_C07_E02_047_S01.png" width="80%"/> <br/> The velocity of solid sphere at the bottom of the inclined plane of angle `theta`. <br/> `<a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a>=sqrt((2gh)/((1+(K^(2))/(R^(2)))))` <br/> Radius of gyration for sphere `K^(2)=(2)/(5)R^(2)` <br/> `therefore v=sqrt((2gh)/(1+(2)/(5)))` <br/> `therefore v=sqrt((10)/(7)gh)` <br/> In this formula there is no term of angle, <a href="https://interviewquestions.tuteehub.com/tag/means-1091780" style="font-weight:bold;" target="_blank" title="Click to know more about MEANS">MEANS</a> the velocity of sphere at the bottom does not depend on the angle and as h is same in the two cases velocity must be same. Time taken to roll down the two planes will also be the same. <br/> (b) Yes, if solid sphere rolls down from both the slopes (1) <a href="https://interviewquestions.tuteehub.com/tag/rolling-1190754" style="font-weight:bold;" target="_blank" title="Click to know more about ROLLING">ROLLING</a> time from slope (1) is less and rolling time from slope (2) is more <br/> (c ) It will <a href="https://interviewquestions.tuteehub.com/tag/take-662846" style="font-weight:bold;" target="_blank" title="Click to know more about TAKE">TAKE</a> more time for slope (2) because acceleration of body parallel to the surface of slope of angle `theta` <br/> `a=(gsintheta)/(sqrt(1+(K^(2))/(R^(2))))` <br/> but for solid sphere `K^(2)=(2)/(5)R^(2)` <br/> `therefore a=(gsintheta)/(1+(2)/(5))=(5gsintheta)/(7)`, <br/> Here `(5)/(7)` and g are constant <br/> `therefore apropsintheta....(1)` <br/> `therefore (a_(1))/(a_(2))=(sintheta_(1))/(sintheta_(2))` [From eqn. (1)] <br/> but in first phase sin is increasing function and `theta_(1)gttheta_(2)impliessintheta_(1)gtsintheta_(2)` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/implies-1037962" style="font-weight:bold;" target="_blank" title="Click to know more about IMPLIES">IMPLIES</a> (sintheta_(1))/(sintheta_(2))gt1` <br/> `therefore (a_(1))/(a_(2))gt1....(2)` <br/> Now in equation of motion `v=v_(0)+at,v` is same and `v_(0)=0` <br/> `therefore` at is constant <br/> `therefore a_(1)t_(1)=a_(2)t_(2)` <br/> `therefore (a_(1))/(a_(2))=(t_(2))/(t_(1))` <br/> `therefore (t_(2))/(t_(1))gt1` [`because` from eqn. (2)] <br/> `therefore t_(2)gtt_(1)` <br/> (c) Short method : <br/> Suppose `d_(1)` = distance (AB) of slope-1 <br/> `d_(2)` = distance (AC) of slope-2 <br/> `t_(1)` = time taken by slope AB <br/> `t_(2)` = time taken by slope AC <br/> Here, solid sphere rolls at the same velocity from both the slope. Hence, time taken depend on the distance of slope. <br/> If distance is more, time taken is also more. <br/> Here `d_(2)gtd_(1) [because theta_(1)gttheta_(2)]` <br/> `therefore t_(2)gtt_(1)`</body></html> | |
| 37536. |
An object is projected vertically up from the earth’s surface with velocity sqrt(Rg)where R is the radius of the earth and ‘g’ is the acceleration due to earth on the surface of earth. The maximum height reached by the object is nR. Find value of n. |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :<a href="https://interviewquestions.tuteehub.com/tag/yes-749457" style="font-weight:bold;" target="_blank" title="Click to know more about YES">YES</a>, a <a href="https://interviewquestions.tuteehub.com/tag/body-900196" style="font-weight:bold;" target="_blank" title="Click to know more about BODY">BODY</a> in <a href="https://interviewquestions.tuteehub.com/tag/circular-916697" style="font-weight:bold;" target="_blank" title="Click to know more about CIRCULAR">CIRCULAR</a> <a href="https://interviewquestions.tuteehub.com/tag/motion-1104108" style="font-weight:bold;" target="_blank" title="Click to know more about MOTION">MOTION</a>.</body></html> | |
| 37537. |
A liquid is kept in a cylindrical vessel which is rotated along is its axis. The liquid rises at the side. If the radius of the vessel is 5cm and the speed of rotation is 4 rev/s, then the difference in the height of the liquid at the centre of the vessel and its sides is |
| Answer» <html><body><p>8mc<br/>2 cm<br/>40 cm<br/>4 cm</p>Answer :A</body></html> | |
| 37538. |
Velocity of the body on reaching the ground is same in magnitude in the following cases (a) a body projected vertically from the top of tower of height .h. with velocity .u. (b) a body thrown down wards with velocity .u. from the top of tower of height .h. (c) a body projected horizontally with a velocity .u. from the top of tower height .h. (d) a body dropped from the top tower of height .h. |
| Answer» <html><body><p>a, d, c and d are correct<br/>a, <a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a> and c are correct<br/>and d are correct<br/>d only correct</p>Answer :B</body></html> | |
| 37539. |
Number of significant digits in 20.00.......... |
| Answer» <html><body><p>1<br/>2<br/>3<br/>4</p>Answer :D</body></html> | |
| 37540. |
Letbe the angular velocity of the earth's rotation about its axis. An object weighed by a spring balance gives the same reading at the equator as at height h above the poles(h lt lt R). The value of h is |
| Answer» <html><body><p>`(<a href="https://interviewquestions.tuteehub.com/tag/omega-585625" style="font-weight:bold;" target="_blank" title="Click to know more about OMEGA">OMEGA</a>^(2) R^(2))/(g)`<br/>`(omega^(2) R^(2))/(<a href="https://interviewquestions.tuteehub.com/tag/2g-300351" style="font-weight:bold;" target="_blank" title="Click to know more about 2G">2G</a>)`<br/>`(<a href="https://interviewquestions.tuteehub.com/tag/2omega-1836110" style="font-weight:bold;" target="_blank" title="Click to know more about 2OMEGA">2OMEGA</a>^(2) R^(2))/(g)`<br/>`(<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(2Rg))/(omega)`</p>Answer :B</body></html> | |
| 37541. |
The energy possessed by a body by virtue of its motion is called as |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/potential-1161228" style="font-weight:bold;" target="_blank" title="Click to know more about POTENTIAL">POTENTIAL</a> energy<br/>kinetic energy<br/>mechanical energy<br/>none</p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 37542. |
A body of mass 1 kg is moving with velocity 30 ms^(-1) due north. It is acted on by a force of 10 N due west for 4 seconds. Find the velocity of the body after the force ceases to act. |
| Answer» <html><body><p>`50m//s , <a href="https://interviewquestions.tuteehub.com/tag/tan-1238781" style="font-weight:bold;" target="_blank" title="Click to know more about TAN">TAN</a>^(-<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>) (3/4)` <br/>`100m//s , tan^(-1) (4/3)` <br/>`50m//s, tan^(-1) (3/5)` <br/>`<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a> m//s, tan^(-1) (4/5)` </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :A</body></html> | |
| 37543. |
A system consistsof a thin ring of radius R and a very long uniform wiere oriented along axis of the ring with one of its ends coinciding with the centre of the ring. If mass of ring is m and the linearmass density of the wire is lambda, then the ineraction force between the ring and the wire is F = (KGmlambda)/(R ), Then find the value of k |
| Answer» <html><body><p><br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a></body></html> | |
| 37544. |
A solid cylinder and a hollow cylinder , both of the same mass and same external diameter are released from the same height at the same time on an inclined plane . Both roll down without slipping . Which one will reach the bottom first ? |
| Answer» <html><body><p>Both together only when angle of inclination of <a href="https://interviewquestions.tuteehub.com/tag/plane-1155510" style="font-weight:bold;" target="_blank" title="Click to know more about PLANE">PLANE</a> is `45^(@)`<br/>Both together <br/>Hollow cylinder <br/>Solid cylinder </p>Solution :Time taken to reach the <a href="https://interviewquestions.tuteehub.com/tag/bottom-401202" style="font-weight:bold;" target="_blank" title="Click to know more about BOTTOM">BOTTOM</a> of inclined plane is `t = <a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>((2 I (1 + (K^(2))/(R^(2))))/(g sin theta))` <br/> Here , l is length of <a href="https://interviewquestions.tuteehub.com/tag/incline-1039880" style="font-weight:bold;" target="_blank" title="Click to know more about INCLINE">INCLINE</a> plane <br/> For solid cylinder `K^(2) = (R^2)/(2)` <br/> For hollow cylinder `K^2 - R^2` <br/> <a href="https://interviewquestions.tuteehub.com/tag/hence-484344" style="font-weight:bold;" target="_blank" title="Click to know more about HENCE">HENCE</a> , solid cylinder will reach the bottom first .<br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/MTG_NEET_GID_PHY_XI_C05_E03_003_S01.png" width="80%"/></body></html> | |
| 37545. |
Planck's constnat has the same dimensions as |
| Answer» <html><body><p>Energy<br/>Power<br/>Linear momentum<br/>Angular momentum</p>Answer :D</body></html> | |
| 37546. |
The distance travelled by a falling body in the last second of its motion, to that in the last but one second is 7 : 5, the velocity with which body strikes the ground is |
| Answer» <html><body><p>19.6 m/s<br/>39.2 m/s<br/>29.4 m/s<br/>49 m/s </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 37547. |
A satellite does not need any fuel to move around the earth. Give reason. |
| Answer» <html><body><p></p>Solution :The gravitational <a href="https://interviewquestions.tuteehub.com/tag/force-22342" style="font-weight:bold;" target="_blank" title="Click to know more about FORCE">FORCE</a> between <a href="https://interviewquestions.tuteehub.com/tag/satellite-1195060" style="font-weight:bold;" target="_blank" title="Click to know more about SATELLITE">SATELLITE</a> and <a href="https://interviewquestions.tuteehub.com/tag/earth-13129" style="font-weight:bold;" target="_blank" title="Click to know more about EARTH">EARTH</a> provides the centripetal force required by the satellite to move in a <a href="https://interviewquestions.tuteehub.com/tag/circular-916697" style="font-weight:bold;" target="_blank" title="Click to know more about CIRCULAR">CIRCULAR</a> orbit.</body></html> | |
| 37548. |
The gas constant for a molecule is (terms have usual meaning) a) K b) R/N c) R/NT d) Rim |
| Answer» <html><body><p>Only 'a' <br/>only <a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a> <br/>Both a & <a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a> <br/>only d </p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :C</body></html> | |
| 37549. |
A simple pendulum has time period T_(1). The point of suspension is now moved upwards according to the relation =kt^(2),Ik=1m//sec^(2)) where y is the vertical displacement. The time period now becomes T_(2) then find the ratio of (T_(1)^(2))/(T_(2)^(2)) (g=10m//sec^(2)) |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :`y-kt^(2)/<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>//2at^(2)` <a href="https://interviewquestions.tuteehub.com/tag/acceleration-13745" style="font-weight:bold;" target="_blank" title="Click to know more about ACCELERATION">ACCELERATION</a> <br/> `implies1/2a=k=1""impliesa=2m//sec^(2)` <br/> `T_(1)=2pisqrt(l/<a href="https://interviewquestions.tuteehub.com/tag/g-1003017" style="font-weight:bold;" target="_blank" title="Click to know more about G">G</a>)` and `T_(2)=2pisqrt(l/(g+a))` <br/> `(T_(1)^(2))/(T_(2)^(2))=(g+a)/g=(10+2)/10=6/5`</body></html> | |
| 37550. |
A transverse harmonic wave on a string is described by y(x,t) = 3.0 sin (36 t + 0.018x + pi//4) where x and y are in cm and t in s. The positive direction of x is from left to right (a) Is this a travelling wave or a stationary wave? If it is travelling what are the speed and direction of its propagation? (b) What are its amplitude and frequency? (c ) What is the initial phase at the origin ? (d) What is the least distance between two successive crests in the wave? |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :(a) A travelling <a href="https://interviewquestions.tuteehub.com/tag/wave-22399" style="font-weight:bold;" target="_blank" title="Click to know more about WAVE">WAVE</a>. It travels from right to left with a <a href="https://interviewquestions.tuteehub.com/tag/speed-1221896" style="font-weight:bold;" target="_blank" title="Click to know more about SPEED">SPEED</a> of `<a href="https://interviewquestions.tuteehub.com/tag/20-287209" style="font-weight:bold;" target="_blank" title="Click to know more about 20">20</a> ms^(-1)` <br/> (b) 3.0cm, 5.7Hz <br/> (<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a> ) `pi//4` <br/> (d) 3.5m</body></html> | |