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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.
| 35801. |
The pressure of a gas at 100^(@)C is 2 atm. When the gas is heated by keeping volume constant, at what temperature the pressure raises to 3 atm ? |
| 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> :`286.5^(@)<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> | |
| 35802. |
A mass m, which is attached to a spring with spring constant k, oscillates on a horizontal table, with amplitude A. At an instant when the spring is streched by sqrt(3) A//2, a second mass m is dropped vertically onto the original mass and immediately sticks to it. what is the amplitude of the resulting motion- |
| 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>((3)/(<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`<br/>`sqrt((7)/(8))A`<br/>`sqrt((13)/(<a href="https://interviewquestions.tuteehub.com/tag/16-276476" style="font-weight:bold;" target="_blank" title="Click to know more about 16">16</a>))A`<br/>`sqrt((2)/(3))A`</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> | |
| 35803. |
A particle projected at angle 60^(@)with speed 10sqrt(3),from the point 'A' as shown in the figure. At the same time the wedge is made to move with speed10sqrt(3) towards right as shown in the figure. |
| Answer» <html><body><p>time taken by <a href="https://interviewquestions.tuteehub.com/tag/particle-1147478" style="font-weight:bold;" target="_blank" title="Click to know more about PARTICLE">PARTICLE</a> to strike <a href="https://interviewquestions.tuteehub.com/tag/wedge-1451188" style="font-weight:bold;" target="_blank" title="Click to know more about WEDGE">WEDGE</a> is <a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> sec<br/>Range on wedge is <a href="https://interviewquestions.tuteehub.com/tag/20-287209" style="font-weight:bold;" target="_blank" title="Click to know more about 20">20</a> m<br/>Maximum horizontal displacement `10sqrt(3)m`<br/>Final velocity of particle is 10 m/s</p>Answer :A::B::<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>::D</body></html> | |
| 35804. |
A merry-go-round, made of ring-like platform of radius R and mass M is revolving with angular speed omega. A person of mass M is standing on it. At one instant, the person jumps off the round, radially away from the centre of the round (as seen from the round). The speed of the round of afterward is ............ |
| Answer» <html><body><p>`2omega`<br/>`omega`<br/>`(omega)/(2)`<br/>0</p>Solution :`I_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)=MR^(2)+MR^(2)=2MR^(2)` (Before) <br/> `omega_(1)=omega` <br/> `I_(2)=MR^(2)+0=MR^(2)` (after) <br/> Now, `I_(1)omega_(1)=I_(2)omega_(2)` <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> omega_(2)=(I_(1)omega_(1))/(I_(2))` <br/> `therefore omega_(2)=2omega`</body></html> | |
| 35805. |
Give the formula for the moment of couple. |
| 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> :Moment of <a href="https://interviewquestions.tuteehub.com/tag/couple-937817" style="font-weight:bold;" target="_blank" title="Click to know more about COUPLE">COUPLE</a> = (<a href="https://interviewquestions.tuteehub.com/tag/magnitude-1083080" style="font-weight:bold;" target="_blank" title="Click to know more about MAGNITUDE">MAGNITUDE</a> of any one of the two forces) `xx` <a href="https://interviewquestions.tuteehub.com/tag/perpendicular-598789" style="font-weight:bold;" target="_blank" title="Click to know more about PERPENDICULAR">PERPENDICULAR</a> <a href="https://interviewquestions.tuteehub.com/tag/distance-116" style="font-weight:bold;" target="_blank" title="Click to know more about DISTANCE">DISTANCE</a> between the two forces.</body></html> | |
| 35806. |
Which of the following curves does not represent motion in one dimensions? |
| Answer» <html><body><p><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_A_C03_E01_073_O01.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_A_C03_E01_073_O02.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_A_C03_E01_073_O03.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_A_C03_E01_073_O04.png" width="30%"/></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> | |
| 35807. |
What are stationary waves? write down the characteristics of stationary waves. |
| Answer» <html><body><p></p>Solution :When two <a href="https://interviewquestions.tuteehub.com/tag/identical-496701" style="font-weight:bold;" target="_blank" title="Click to know more about IDENTICAL">IDENTICAL</a> waves of same amplitude and frequency travelling in <a href="https://interviewquestions.tuteehub.com/tag/opposite-1137237" style="font-weight:bold;" target="_blank" title="Click to know more about OPPOSITE">OPPOSITE</a> directionals with same speed along the same path superpose each other , the <a href="https://interviewquestions.tuteehub.com/tag/resultant-1187362" style="font-weight:bold;" target="_blank" title="Click to know more about RESULTANT">RESULTANT</a> wave does not travel in the <a href="https://interviewquestions.tuteehub.com/tag/either-7265046" style="font-weight:bold;" target="_blank" title="Click to know more about EITHER">EITHER</a> direction and is called stationary or standing waves .</body></html> | |
| 35808. |
When 0.15 kg of ice of 0" "^(@)C mixed with 0.30 kg of water at 50" "^(@)C in a container, the resulting temperature is 7.6" "^(@)C. Calculate the heat of fusion of ice. ""(S_("water")=4186" J kg"^(-1)K^(-1)) |
| 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> :`L_(<a href="https://interviewquestions.tuteehub.com/tag/f-455800" style="font-weight:bold;" target="_blank" title="Click to know more about F">F</a>)=3.23xx10^(5)" <a href="https://interviewquestions.tuteehub.com/tag/jkg-2139511" style="font-weight:bold;" target="_blank" title="Click to know more about JKG">JKG</a>"^(-1)`</body></html> | |
| 35809. |
0.49("cal")/(cmxxKxxs)= . . .. (J)/(mxxKxxs) |
| 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/49-318440" style="font-weight:bold;" target="_blank" title="Click to know more about 49">49</a></body></html> | |
| 35810. |
Two capillary tubes of same length but different radii r_(1)andr_(2) are fitted in parallel to the bottom of a vessel. The pressure head is P. What should be the radius of a single tube that can replace the two tubes so that the rate of flow is same as before |
| Answer» <html><body><p>`r_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)^(<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a>)+r_(2)^(4)`<br/>`(r_(1)^(2)+r_(2)^(2))^((1)/(4))` <br/>`(r_(1)^(4)+r_(2)^(4))^((1)/(4))` <br/>`r_(1)+r_(2)`</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> | |
| 35811. |
A spring of force constant k is cut info two pieces such that one piece is double the length of the other. Then, the long plece will have a force constant of |
| Answer» <html><body><p><br/></p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/force-22342" style="font-weight:bold;" target="_blank" title="Click to know more about FORCE">FORCE</a> constant of each <a href="https://interviewquestions.tuteehub.com/tag/half-1014510" style="font-weight:bold;" target="_blank" title="Click to know more about HALF">HALF</a> becomes twice the force constant of the <a href="https://interviewquestions.tuteehub.com/tag/original-1139424" style="font-weight:bold;" target="_blank" title="Click to know more about ORIGINAL">ORIGINAL</a> <a href="https://interviewquestions.tuteehub.com/tag/spring-11487" style="font-weight:bold;" target="_blank" title="Click to know more about SPRING">SPRING</a>.</body></html> | |
| 35812. |
(A): Water at the foot of the water fall is always at different temperature from that at the top. (R ): The potential energy of water at the top is converted into heat energy during falling. |
| Answer» <html><body><p>Both 'A' and 'R' are <a href="https://interviewquestions.tuteehub.com/tag/true-713260" style="font-weight:bold;" target="_blank" title="Click to know more about TRUE">TRUE</a> and 'R' is the correct <a href="https://interviewquestions.tuteehub.com/tag/explanation-455162" style="font-weight:bold;" target="_blank" title="Click to know more about EXPLANATION">EXPLANATION</a> of 'A's<br/>Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A's<br/>A' is true and 'R ' is <a href="https://interviewquestions.tuteehub.com/tag/false-459184" style="font-weight:bold;" target="_blank" title="Click to know more about FALSE">FALSE</a><br/>A' is false and 'R' is true</p>Answer :A</body></html> | |
| 35813. |
A boy of mass M is applying a horizontal force to slide a box of mass M_(1) on rough horizontal surface. The coefficient of friction between the shoe of the boy and the floor is mu and that between the box and the floor is ‘mu_(1)’ In which of the following cases is it certainly not possible to slide the box ? |
| Answer» <html><body><p>`multmu_(1), M ltM_(1)`<br/>`mugt mu_(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>), M gt M_(1)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/mu-566056" style="font-weight:bold;" target="_blank" title="Click to know more about MU">MU</a> lt mu_(1), M gt M_(1)`<br/>`mu gt mu_(1), M lt M_(1)`</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> | |
| 35814. |
Unit used to measure nuclear diameters is |
| Answer» <html><body><p>fermi<br/>angstrom<br/>micron<br/>nanometre</p>Answer :A</body></html> | |
| 35815. |
A simple pendulum of length l and mass m free to oscillate in vertical plane. A nail is located at a distance d=l-a vertically below the point of suspension of a simple pendulum. The pendulum bob is released from the position where the string makes an angle of 90^@ from vertical. Discuss the motion of the bob if (a) l=2a and (b) l=2.5a. |
| Answer» <html><body><p></p>Solution :a. `l=2a`, velocity at lowest point from <a href="https://interviewquestions.tuteehub.com/tag/energy-15288" style="font-weight:bold;" target="_blank" title="Click to know more about ENERGY">ENERGY</a> conservation <br/> `0+mg2a=1/2mv^2` <br/> `v=sqrt(4ga)` <br/> Here the radius of <a href="https://interviewquestions.tuteehub.com/tag/circle-916533" style="font-weight:bold;" target="_blank" title="Click to know more about CIRCLE">CIRCLE</a> is a about nail and velocity at lowest point is not sufficient to <a href="https://interviewquestions.tuteehub.com/tag/complete-423576" style="font-weight:bold;" target="_blank" title="Click to know more about COMPLETE">COMPLETE</a> the loop. Therefore, <a href="https://interviewquestions.tuteehub.com/tag/motion-1104108" style="font-weight:bold;" target="_blank" title="Click to know more about MOTION">MOTION</a> of bob is the combination of circular and projectile motion. Because the velocity at lowest point <a href="https://interviewquestions.tuteehub.com/tag/lies-1073086" style="font-weight:bold;" target="_blank" title="Click to know more about LIES">LIES</a> between `sqrt(3ga)` and `sqrt(5ga)`. <br/> b. `l=2.5a`, Velocity at lowest point from energy conservation <br/> `0+mg(2.5a)=1/2mv^2impliesv=sqrt(5ga)` <br/> here radius of circle is a about nail and velocity at lowest point is just sufficient to complete the loop so that here looping the loop about nail.</body></html> | |
| 35816. |
If 27 small spheres each of M.I. T about their diametrical axis are combined to form a big sphere, then the M.I. of the big sphere about its diameter is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/243-1827701" style="font-weight:bold;" target="_blank" title="Click to know more about 243">243</a> I<br/>81 I<br/>27 I<br/>9 I </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> | |
| 35817. |
In column - I some physical situations are mentioned, in column - II corresponding variations of resultant quantities percentasge errors are mentioned. Match column - I entries appropriately with column - II entries |
| 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-PR; B-PR; C-PQR; D-RS</body></html> | |
| 35818. |
A load of mass m falls from a height h on to the scale pan hung from a spring as shown in the adjoining figure. If the spring constant is k and mass of the scale pan is zero and the mass m does not bounce relative to the pan, then the amplitude of vibration is |
| Answer» <html><body><p>`(mg)/(k)`<br/>`(mg)/(k)<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(((1+2hk)/(mg)))`<br/>`(mg)/(k)+(mg)/(k)sqrt(((1+2hk)/(mg)))`<br/>`(mg)/(k)sqrt(((1+2hk)/(mg)-(mg)/(k)))`</p>Solution :According to conservation principle <br/> `mgh=(1)/(2)kx_(0)^(2)-mgx_(0)` <br/> where, `x_(0)` is maximum elongation in spring (when <a href="https://interviewquestions.tuteehub.com/tag/particle-1147478" style="font-weight:bold;" target="_blank" title="Click to know more about PARTICLE">PARTICLE</a> is in its <a href="https://interviewquestions.tuteehub.com/tag/lowest-1081124" style="font-weight:bold;" target="_blank" title="Click to know more about LOWEST">LOWEST</a> <a href="https://interviewquestions.tuteehub.com/tag/extreme-981946" style="font-weight:bold;" target="_blank" title="Click to know more about EXTREME">EXTREME</a> position). <br/> or `(1)/(2)kx_(0)^(2)-mgx_(0)-mgh=0` <br/> or `x_(0)^(2)-(2mg)/(k)x_(0)-(2mg)/(k)h=0` <br/> `therefore""x_(0)=((2mg)/(k)pmsqrt([((2mg)/(k))^(2)+4xx(2mg)/(k)h]))/(2)` <br/> `because` Amplitude=elongation in spring for lowest extreme position-elongation in spring for equilibrium position <br/> `=x_(0)-x_(1)=(mg)/(k)sqrt((1+(2hk)/(mg)))`</body></html> | |
| 35819. |
A car starts from rest, accelerates uniformly for 4 seconds and then moves with uniform velocity . Which of the (x-t) graphs shown in fig. represents the motion of the car upto t=7s ? |
| Answer» <html><body><p><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_TRG_AO_PHY_XI_V01_A_C04_E02_069_O01.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_TRG_AO_PHY_XI_V01_A_C04_E02_069_O02.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_TRG_AO_PHY_XI_V01_A_C04_E02_069_O03.png" width="30%"/><br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_TRG_AO_PHY_XI_V01_A_C04_E02_069_O04.png" width="30%"/></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> | |
| 35820. |
ML^(2)T^(-2)I^(2) is the dimensional formula for |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/self-1199734" style="font-weight:bold;" target="_blank" title="Click to know more about SELF">SELF</a> <a href="https://interviewquestions.tuteehub.com/tag/inductance-1042546" style="font-weight:bold;" target="_blank" title="Click to know more about INDUCTANCE">INDUCTANCE</a> <br/><a href="https://interviewquestions.tuteehub.com/tag/magnetic-551115" style="font-weight:bold;" target="_blank" title="Click to know more about MAGNETIC">MAGNETIC</a> induction<br/>Magnetic moment<br/>Electric conductance</p>Answer :A</body></html> | |
| 35821. |
(A) Although the surfaces of a google lens are curved, it does not have any power. ( R) In case of goggles, both the curved surfaces have equal radii of curvature. |
| Answer» <html><body><p>Both A and R are true and R is the <a href="https://interviewquestions.tuteehub.com/tag/correct-409949" style="font-weight:bold;" target="_blank" title="Click to know more about CORRECT">CORRECT</a> <a href="https://interviewquestions.tuteehub.com/tag/explanation-455162" style="font-weight:bold;" target="_blank" title="Click to know more about EXPLANATION">EXPLANATION</a> of A<br/>Both A and R are true and R is not the correct explanation of A<br/>A is true and R is false<br/>Both A and R is false</p>Answer :A</body></html> | |
| 35822. |
A person of mass 60 kg is in a lift. The change in the apparent weight of the person, when the lift moves up with an acceleration of 2ms^(-2) and then down with an acceleration of 2ms^(-2) is ("take g = "10 m//sec^(2)) |
| Answer» <html><body><p>120 N<br/>240 N<br/>480 N <br/><a href="https://interviewquestions.tuteehub.com/tag/720-334419" style="font-weight:bold;" target="_blank" title="Click to know more about 720">720</a> N</p>Solution :`w_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)=m(g+a), w_(2)=m(g-a)`</body></html> | |
| 35823. |
The blades of a windmill sweep out a circle of area A. Assume that the windmill converts 25% of the wind's energy into electrical energy, and that A= 30 m^(2), v= 36 km/h and the density of air is 1.2 kgm^(-3). What is the electrical power produced? |
| 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/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :`P= 4.5 <a href="https://interviewquestions.tuteehub.com/tag/kw-1063128" style="font-weight:bold;" target="_blank" title="Click to know more about KW">KW</a>`</body></html> | |
| 35824. |
A trolley of mass 360 kg is lying on a horizontal frictionless surface. A mas of mass 40 kg runs with uniform speed on the trolley by a distance of 2m in 0.5 second. What is the velocity of the trolley relative to earth ? |
| Answer» <html><body><p>0.8 m/s<br/>0.4 m/s <br/>1.6 m/s <br/>2.2 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> | |
| 35825. |
Calculate the minimum work that must be done to compress 1.0 gm of hydrogen at N.T.P. to half its initial volume. Given R =8.314 J mol ^(-1) K ^(-1). |
| Answer» <html><body><p></p>Solution :`W = 2.303 xx r T <a href="https://interviewquestions.tuteehub.com/tag/log-543719" style="font-weight:bold;" target="_blank" title="Click to know more about LOG">LOG</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/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a> _(2) //V _(1) = 2. 303 xx 14. 157 xx 273 log _(10) (0.5) =- <a href="https://interviewquestions.tuteehub.com/tag/786-1921074" style="font-weight:bold;" target="_blank" title="Click to know more about 786">786</a>. 55 <a href="https://interviewquestions.tuteehub.com/tag/j-520843" style="font-weight:bold;" target="_blank" title="Click to know more about J">J</a>`</body></html> | |
| 35826. |
For what value of 'h' of orifice below the jet the range will be maximum ? |
| 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> :For a maximum <a href="https://interviewquestions.tuteehub.com/tag/range-1177030" style="font-weight:bold;" target="_blank" title="Click to know more about RANGE">RANGE</a> `(<a href="https://interviewquestions.tuteehub.com/tag/dx-960990" style="font-weight:bold;" target="_blank" title="Click to know more about DX">DX</a>)/(<a href="https://interviewquestions.tuteehub.com/tag/dh-943253" style="font-weight:bold;" target="_blank" title="Click to know more about DH">DH</a>)=(H-2h)=0""<a href="https://interviewquestions.tuteehub.com/tag/therefore-706901" style="font-weight:bold;" target="_blank" title="Click to know more about THEREFORE">THEREFORE</a> h=H/2`</body></html> | |
| 35827. |
C_(p)is always greater than C_(v)for a gas. Whichof the following statements provide, partly or wholly, the reason for this? a) No work is done by a gas at constant volume b) When a gas absorbs heat at constantpressure, its volume must change c) For the same change in temperature, theinteral energy of a gas changes by a smallar amount at constant volume than at constantpressure d) The internal energy of an ideal gas is afunction only of its temperature |
| Answer» <html><body><p>only 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> are <a href="https://interviewquestions.tuteehub.com/tag/correct-409949" style="font-weight:bold;" target="_blank" title="Click to know more about CORRECT">CORRECT</a><br/>only b, d are correct <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>, d are correct <br/>all are correct </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> | |
| 35828. |
A brass disc is stuck in a hole of a steel plate. Should you heat the system to free the disc from the hole? Given, alpha for brass =19 times 10^(-6@)C^(-1)" and " alpha for steel =12 times 10^(-6@)C^(-1). |
| Answer» <html><body><p></p>Solution :To free the disc from the hole, the system should cooled. <br/> Since `alpha_(brass) <a href="https://interviewquestions.tuteehub.com/tag/gt-1013864" style="font-weight:bold;" target="_blank" title="Click to know more about GT">GT</a> alpha_(steel)`, and <a href="https://interviewquestions.tuteehub.com/tag/initially-516121" style="font-weight:bold;" target="_blank" title="Click to know more about INITIALLY">INITIALLY</a> the radii of the disc and the hole were the same, the disc <a href="https://interviewquestions.tuteehub.com/tag/expands-2076032" style="font-weight:bold;" target="_blank" title="Click to know more about EXPANDS">EXPANDS</a> more on <a href="https://interviewquestions.tuteehub.com/tag/heating-1017297" style="font-weight:bold;" target="_blank" title="Click to know more about HEATING">HEATING</a> and <a href="https://interviewquestions.tuteehub.com/tag/gets-1005751" style="font-weight:bold;" target="_blank" title="Click to know more about GETS">GETS</a> stuck more tightly. On cooling, the disc contracts more than the hole, and thus becomes free.</body></html> | |
| 35829. |
Number of significant digits in 3256........... |
| Answer» <html><body><p>1<br/>2<br/>3<br/>4</p>Answer :D</body></html> | |
| 35830. |
An iron cube , of edge10 cm ,painted black is at a temperatureof 127^(@) C keptin aroom of tempeature27^(@)C. Ifthe densityand specific heat capacityof ironbe 7600 kg//m^(2)and 470 J// Kg - K , findthe initial rate of coolingof the cube. |
| Answer» <html><body><p></p>Solution :Here , area `A = 6a^(2) ` and volume`<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^(3) , 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> xx 10^(2)m ,e= 1 ` ( `because` the surfaceis painted black ). <br/> `rho = 7600 kg // m^(3) , s = 470 J.Kg - <a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a>, T = 400 K and T_(0) = 300K`the rate of cooling of a hot bodyis given by` - (dT)/(dt) = (Ae sigma)/(rho Vs)(T^(4) - T_(0)^(4))= (6a^(2) sigma)/( rhoa^(3)s) (T^(4) - T_(0)^(4))`<br/> `= (6 xx 5.67 xx 10^(-8) W (400^(4) - <a href="https://interviewquestions.tuteehub.com/tag/300-305868" style="font-weight:bold;" target="_blank" title="Click to know more about 300">300</a>^(4))K^(4))/((7600(kg)/(m^(3)))((470J)/(Kg - K))m^(2) - K^(4) (10 xx 10^(-2) m))=16.67 xx 10^(-3) K//s`</body></html> | |
| 35831. |
Number of significant digits in 0.030400............. |
| Answer» <html><body><p>6<br/>5<br/>4<br/>3</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> | |
| 35832. |
A particle stars from origin at t=0 with a velocity 5.0hatim//s and moves in x-y plane under action of a force which produces a constant acceleration of (3.0hati+2.0hatj) m//s^(2). (a)What is the y- coordinate of the particle at the instant its x - coordinate is 84 m ? (b) What is the speed of the particle at this time ? |
| Answer» <html><body><p></p>Solution :From Eq . (4.34a) for `r_(0)=0`, the <a href="https://interviewquestions.tuteehub.com/tag/position-1159826" style="font-weight:bold;" target="_blank" title="Click to know more about POSITION">POSITION</a> of the <a href="https://interviewquestions.tuteehub.com/tag/particle-1147478" style="font-weight:bold;" target="_blank" title="Click to know more about PARTICLE">PARTICLE</a> is given by `r(t)=v_(0)t+(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)/(2)at^(2)`<br/>`=5.0hati+(1//2)(3.0hati+2.0hatj)t^(2)`<br/>Therefore , `x(t)=5.0t+1.5t^(2)`<br/>`y(t)=+1.0t^(2)`<br/>Given`x(t)=84m.t=`?<br/>`5.0t+1.5t^(2)=84rArrt=6s`<br/>At`t=6s,y=1.0(6)^(2)=36.0m`<br/>Now , the velocity `v=(dr)/(dt)=(5.0+3.0)hati+2.0hatj`<br/>At `t=6s,v=23.0hati+12.0hatj`<br/>speed `=|v|=sqrt(23^(2)+12^(2))~=<a href="https://interviewquestions.tuteehub.com/tag/26-298265" style="font-weight:bold;" target="_blank" title="Click to know more about 26">26</a> "m s"^(-1)`.</body></html> | |
| 35833. |
We plot the graph having temperature in""^(@)C on x - axis and in ""^(@)F on y - axis. If the graph is straight line, then the correct statement is |
| Answer» <html><body><p>the line <a href="https://interviewquestions.tuteehub.com/tag/intercepts-1047804" style="font-weight:bold;" target="_blank" title="Click to know more about INTERCEPTS">INTERCEPTS</a> the positive <a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a> - axis<br/>the line intercepts the positive y - axis<br/>the line passes through origin<br/>the line intercepts the <a href="https://interviewquestions.tuteehub.com/tag/negative-570381" style="font-weight:bold;" target="_blank" title="Click to know more about NEGATIVE">NEGATIVE</a> axis of both x and y - <a href="https://interviewquestions.tuteehub.com/tag/axes-386573" style="font-weight:bold;" target="_blank" title="Click to know more about AXES">AXES</a> </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> | |
| 35834. |
A particle executing SHM crossed points A and B with the same velocity. Having taken 3 s in passing from A to B, it returns to B after another 3s. The time period is: |
| Answer» <html><body><p>15s<br/>6s <br/>12s<br/>9s </p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/time-19467" style="font-weight:bold;" target="_blank" title="Click to know more about TIME">TIME</a> <a href="https://interviewquestions.tuteehub.com/tag/period-1151023" style="font-weight:bold;" target="_blank" title="Click to know more about PERIOD">PERIOD</a> of oscillation= 2 x (A to <a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) + return to B) <br/> ` = 2 xx (<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a> + 3) , T = 12 s `</body></html> | |
| 35835. |
Two particles P and Q of mass 1 kg and 3 kg respectively start moving towards each other form rest under mutual attraction. What is the velocity of their center of mass ? |
| 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/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a> of first particle P is `m_(1)=1kg` <br/> Mass of second particle Q is <br/>`m_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)=3kg` <br/>Velocity of particle P `=` Velocity of particle Q but in <a href="https://interviewquestions.tuteehub.com/tag/opposite-1137237" style="font-weight:bold;" target="_blank" title="Click to know more about OPPOSITE">OPPOSITE</a> Q but in opposite direction <br/> `:.` Velocity of centre of mass `v_(cm)=(m_(1)v_(1)+m_(2)v_(2))/(m_(1)+m_(2))` <br/> `=0`</body></html> | |
| 35836. |
In a double star system two stars of masses m_(1) and m_(2) separated by a distance 'd' rotates about their centre of mass. Then the common angular velocity and time period is |
| 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> :<img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_B_C09_SLV_016_S01.png" width="80%"/> <br/> The gravitational force between the masses provides the necessary centripetal force <br/> `(Gm_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)m_(2))/(d) = m_(1)r_(1) omega^(2) <a href="https://interviewquestions.tuteehub.com/tag/rarr-1175461" style="font-weight:bold;" target="_blank" title="Click to know more about RARR">RARR</a> (1)` <br/> The <a href="https://interviewquestions.tuteehub.com/tag/distance-116" style="font-weight:bold;" target="_blank" title="Click to know more about DISTANCE">DISTANCE</a> of centre of mass from `m_(1)` is <br/> `r_(1) = (m_(2)d)/(m_(1)+m_(2))rarr (2)`, <br/> From (1) and (2) <br/> `(Gm_(1)m_(2))/(d^(2)) = (m_(1)m_(2)d)/(m_(1)+m_(2)).omega^(2)` <br/> (or) `omega^(2) = (G(m_(1)+m_(2)))/(d^(3))` (or) <br/> `omega = sqrt((G(m_(1) + m_(2)))/(d^(3)))`</body></html> | |
| 35837. |
A large bottle open at top is fitted with a siphon made of capillary glass tubing at its bottom. Find the ratio of the times taken to empty the bottle when it is filled (1) with water (ii) with petrol of density 0.8 cgs unit. The viscosity of water and petrol are 0.01 and 0.02 cgs units respectively |
| Answer» <html><body><p>`1:2`<br/>`1:4`<br/>`1:5`<br/>`2:5`</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> :D</body></html> | |
| 35838. |
A gaseous mixture consists of 16 g of helium and 16 g of oxygen. The ratio of C_(P) and C_(V) is |
| Answer» <html><body><p>1.4<br/>1.54<br/>1.59<br/>1.62</p>Answer :D</body></html> | |
| 35839. |
When there is no external force, the shape of a liquid drop is determined by |
| Answer» <html><body><p>Surface <a href="https://interviewquestions.tuteehub.com/tag/tension-1241727" style="font-weight:bold;" target="_blank" title="Click to know more about TENSION">TENSION</a> of the <a href="https://interviewquestions.tuteehub.com/tag/liquid-1075124" style="font-weight:bold;" target="_blank" title="Click to know more about LIQUID">LIQUID</a> <br/>Density of liquid <br/>Viscocity of liquid <br/>Temperature of <a href="https://interviewquestions.tuteehub.com/tag/air-852233" style="font-weight:bold;" target="_blank" title="Click to know more about AIR">AIR</a> only </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> | |
| 35840. |
Weight is suspended to the end of elastic spring its increaed length depends upon what ? |
| Answer» <html><body><p></p>Solution :(1 ) `Delta l prop <a href="https://interviewquestions.tuteehub.com/tag/mg-1095425" style="font-weight:bold;" target="_blank" title="Click to know more about MG">MG</a> ` (weight)(2) `Delta l prop l` (Original length) <br/> (3)` Delta l prop (1)/(A)` (Cross <a href="https://interviewquestions.tuteehub.com/tag/section-25668" style="font-weight:bold;" target="_blank" title="Click to know more about SECTION">SECTION</a> of <a href="https://interviewquestions.tuteehub.com/tag/wire-1457703" style="font-weight:bold;" target="_blank" title="Click to know more about WIRE">WIRE</a>) <br/> (4) Type of <a href="https://interviewquestions.tuteehub.com/tag/spring-11487" style="font-weight:bold;" target="_blank" title="Click to know more about SPRING">SPRING</a> `to` on spring <a href="https://interviewquestions.tuteehub.com/tag/constnat-2540719" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTNAT">CONSTNAT</a></body></html> | |
| 35841. |
At the maximum height of a body thrown vertically up |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> is not <a href="https://interviewquestions.tuteehub.com/tag/zero-751093" style="font-weight:bold;" target="_blank" title="Click to know more about ZERO">ZERO</a> but ieceleraton is zero<br/>acerleration is not <a href="https://interviewquestions.tuteehub.com/tag/yer-3298514" style="font-weight:bold;" target="_blank" title="Click to know more about YER">YER</a> but alacity is zero<br/>both <a href="https://interviewquestions.tuteehub.com/tag/accleration-846938" style="font-weight:bold;" target="_blank" title="Click to know more about ACCLERATION">ACCLERATION</a> and velocity are zero<br/>both accleration and velocity are not zero</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> | |
| 35842. |
A sphere is rotating about a siameter |
| Answer» <html><body><p>The particles on 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 <a href="https://interviewquestions.tuteehub.com/tag/sphere-1222094" style="font-weight:bold;" target="_blank" title="Click to know more about SPHERE">SPHERE</a> do not have any linear acceleration <br/>The <a href="https://interviewquestions.tuteehub.com/tag/particle-1147478" style="font-weight:bold;" target="_blank" title="Click to know more about PARTICLE">PARTICLE</a> on the diameter mentioned above do not have any linear acceleration <br/><a href="https://interviewquestions.tuteehub.com/tag/different-951434" style="font-weight:bold;" target="_blank" title="Click to know more about DIFFERENT">DIFFERENT</a> particles on the surface have different angular speeds <br/>All the particles on the surface have linear speed. </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> | |
| 35843. |
Water rises in a capilaary tube to a height of 2.0cm. In another capilary tube of radius one third of the first, water remains at a partricular height inside it. Find the height of water in the second capillary. |
| 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> :Given `h_(1)=2cm""r_(2)=(r_(1)/3)` <br/> since `h <a href="https://interviewquestions.tuteehub.com/tag/alpha-858274" style="font-weight:bold;" target="_blank" title="Click to know more about ALPHA">ALPHA</a> 1/<a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a> ""h_(2)/h_(1)=r_(1)/r_(2)` <br/> i.e,` h_(2)=(r_(1)/r_(2))h_(1)=((3r_(2))/(r_(2))h_(1)=3 <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> 2,""i.e, h_(2)=6cm.`</body></html> | |
| 35844. |
Estimate the average thermal energy of a helium atom at (i) room temperature (27 ^(@)C). (ii) the temperature on the surface of the Sun (6000 K), (iii) the temperature of 10 million kelvin (the typical core temperature in the case of a star). |
| Answer» <html><body><p>`1.7 xx 10^(-16)<a href="https://interviewquestions.tuteehub.com/tag/j-520843" style="font-weight:bold;" target="_blank" title="Click to know more about J">J</a>`<br/>`2.1 xx 10^(-16)J`<br/>`4.3 xx 10^(-16)J`<br/>`3.8 xx 10^(-16)J`</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> | |
| 35845. |
A body is moving under the expense of a constant power. If .X. is the displacement in time .t., then .x. is proportional to |
| Answer» <html><body><p>`t^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>//3)`<br/>`t^(3//2)`<br/>`t^(2)`<br/>`t^(1//2)`</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> | |
| 35846. |
Five moles of hydrogen when heated through 20 K expand by an amount of 8.3xx10^(-3)m^(3)under a constant pressure of10^(5)N//m^(2). " If "C_(v)=20J//"mole"K,"Find"C_(p). |
| Answer» <html><body><p>28.3<br/>36.3<br/>44.3<br/>48.3</p>Answer :A</body></html> | |
| 35847. |
Four spheres, a, b, c, d of same material and equal volume are dropped into four liquids of densities d_(1),d_(2),d_(3) and d_(4)(d_(1)gtd_(2)gtd_(3)gtd_(4)). The ascending order of the terminal velocities (eta is same) |
| Answer» <html><body><p>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>, <a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>, d<br/>d, c, b, a<br/>d, c, a, b<br/>b, c, d, a</p>Answer :A</body></html> | |
| 35848. |
A particle of mass m moves on a circularpath ofradius r . Its centripetal acceleration is kt^(2), where k isa constant andt is time . Express power as function of t . |
| 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>>kmt <br/>ktmr<br/>km/t<br/>kmr/t </p>Solution :Here radial centripetal acceleration`a = (v^(2))/r`<br/> ` = kt^(2) ` is given<br/>Now , <a href="https://interviewquestions.tuteehub.com/tag/taking-1238585" style="font-weight:bold;" target="_blank" title="Click to know more about TAKING">TAKING</a> derivation w.r.ttime , t . <br/> `(<a href="https://interviewquestions.tuteehub.com/tag/2v-300496" style="font-weight:bold;" target="_blank" title="Click to know more about 2V">2V</a> (dv)/(dt)) 1/r = 2 kt` <br/> Multiplyingon both sides by .m.<br/> ` :.<a href="https://interviewquestions.tuteehub.com/tag/mv-1082193" style="font-weight:bold;" target="_blank" title="Click to know more about MV">MV</a> (dv)/(dt) = mktr` <br/> ` :. <a href="https://interviewquestions.tuteehub.com/tag/fv-458643" style="font-weight:bold;" target="_blank" title="Click to know more about FV">FV</a> = ktmr"" ( :. F = ma = m (dv)/(dt))` <br/> ` :. P = ktmr"" (:. P = Fv)`</body></html> | |
| 35849. |
If four forces act at a point .O. as shown in the figure and if O is in equalibrium then the value of .theta. & .P. are |
| Answer» <html><body><p>`15^(0), 10sqrt(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)N`<br/>`45^(0), 10 N`<br/>`75^(0), 10sqrt(2)N`<br/>`90^(0), <a href="https://interviewquestions.tuteehub.com/tag/20-287209" style="font-weight:bold;" target="_blank" title="Click to know more about 20">20</a> N` </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> | |
| 35850. |
{:(,"Measured value",,"Significant figures"),((A),0.0235,(P),5),((B),235xx10^(2),(Q),4),((C ),46.64 div 2.3,(R ),3),((D),234.0,(S),2):} |
| 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-R; B-R; C-S; D-Q</body></html> | |