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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.
| 39601. |
Explain the method to find the centre of gravity of irregularly shaped lamina. |
| Answer» <html><body><p></p>Solution :(i) The center of gravity of a uniform lamina of even an irregular <a href="https://interviewquestions.tuteehub.com/tag/shape-1204673" style="font-weight:bold;" target="_blank" title="Click to know more about SHAPE">SHAPE</a> is determined by pivoting it at various <a href="https://interviewquestions.tuteehub.com/tag/points-1157347" style="font-weight:bold;" target="_blank" title="Click to know more about POINTS">POINTS</a> by trial and error. <br/> (ii) The lamina remains horizontal when pivoted at the point where the net 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> acts, which is the center of gravity. <br/> (<a href="https://interviewquestions.tuteehub.com/tag/iii-497983" style="font-weight:bold;" target="_blank" title="Click to know more about III">III</a>) When a body is supported at the center of gravity, the sum of the torques acting on all the point masses of the rigid body 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>. Moreever the weight is compensated by the normal reaction force exerted by the pivot. <br/> (iv) The body is in static equilibrium and hence it remains horizontal. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/SUR_PHY_XI_V01_C05_E03_002_S01.png" width="80%"/> <br/> (v) There is also another way to determine the center of gravity of an irregular lamina. If we suspend the lamina from different points like P, Q, R. The vertical lines PP', QQ', RR' all pass through the center of gravity. <br/> (vi) Here, reaction force acting at the point of suspension and the gravitational force acting at the center of gravity cancel each other and the torques caused by them also cancel each other.</body></html> | |
| 39602. |
Two metallic spheres S_(1) and S_(2) made of same material have identical surface finish. The mass of S_(1) is 3 times that of S_(2). Both are heated to same temperature and are placed in same surroundings. Then ratio of their initial rates of fall of temperature will be |
| Answer» <html><body><p>`(<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/sqrt3-3056952" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT3">SQRT3</a>)`<br/>`(1)/(<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/>`((1)/(3))^(1/3)`<br/>`( sqrt3)/( 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 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> | |
| 39603. |
If vec(P)=2hat(i)+3hat(j)-4hat(k)andvec(Q)=5hat(i)+2hat(j)+4hat(k). Find the angle between the two vectors. |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/30-304807" style="font-weight:bold;" target="_blank" title="Click to know more about 30">30</a>^(@)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/45-316951" style="font-weight:bold;" target="_blank" title="Click to know more about 45">45</a>^(@)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>^(@)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/90-341351" style="font-weight:bold;" target="_blank" title="Click to know more about 90">90</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> :D</body></html> | |
| 39604. |
A sine wave travelling to right is represented by the equation y=asin(kx-omegat).The velocity of the wave is given by |
| Answer» <html><body><p>`k/omega`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/omegat-2889234" style="font-weight:bold;" target="_blank" title="Click to know more about OMEGAT">OMEGAT</a>`<br/>`omega/k`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/kt-1063108" style="font-weight:bold;" target="_blank" title="Click to know more about KT">KT</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> :<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> | |
| 39605. |
Whyclothes are easily washed by soap or detergent ? |
| Answer» <html><body><p></p>Solution :The addition of soap detergent in water reduce the angle of contact .the <a href="https://interviewquestions.tuteehub.com/tag/dirt-955128" style="font-weight:bold;" target="_blank" title="Click to know more about DIRT">DIRT</a> of matter is enclosed in the clothes . The molecules of detergent are hairpin <a href="https://interviewquestions.tuteehub.com/tag/shape-1204673" style="font-weight:bold;" target="_blank" title="Click to know more about SHAPE">SHAPE</a>, with one end attracted to water and the other to molecules of grease, oil or wax (dirt), thus <a href="https://interviewquestions.tuteehub.com/tag/tending-7716878" style="font-weight:bold;" target="_blank" title="Click to know more about TENDING">TENDING</a> to form water -oil interfaces . the 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> reduces drastically. Hence clothes washes easily. <br/> Water <a href="https://interviewquestions.tuteehub.com/tag/proofing-607405" style="font-weight:bold;" target="_blank" title="Click to know more about PROOFING">PROOFING</a> agent is added for forming large angle of contact between water and fibers.</body></html> | |
| 39606. |
While polishing a substance if the polishing cloth is pressed hard a considerable amount of heat is developed. Why ? |
| 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> :Increase in pressure increases the normal force. Hence force of <a href="https://interviewquestions.tuteehub.com/tag/friction-21545" style="font-weight:bold;" target="_blank" title="Click to know more about FRICTION">FRICTION</a> also increases. So, a <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> <a href="https://interviewquestions.tuteehub.com/tag/amount-374803" style="font-weight:bold;" target="_blank" title="Click to know more about AMOUNT">AMOUNT</a> of work has to be done against friction while polishing, which in turn generates a a greater amount of <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a>.</body></html> | |
| 39607. |
A uniform rod AB of mass 'm' length 2a is allowed to fall under gravity with AB in horizontal. When the speed of the rod is 'v', suddenly the end 'A' is fixed. Find the angular velocity with which it begins to rotate . |
| Answer» <html><body><p></p>Solution :`L_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)=L_(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)` <br/> `mva=Iomega` <br/> `mva=(m(2a)^(2))/(3)omegaimpliesomega=(<a href="https://interviewquestions.tuteehub.com/tag/3v-310794" style="font-weight:bold;" target="_blank" title="Click to know more about 3V">3V</a>)/(<a href="https://interviewquestions.tuteehub.com/tag/4a-318696" style="font-weight:bold;" target="_blank" title="Click to know more about 4A">4A</a>)` <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_NEO_CAO_PHY_XI_V01_B_C07_SLV_086_S01.png" width="80%"/></body></html> | |
| 39608. |
Two liquids at temperatures 60^@C and 20^@C respectivelyhave masses in the ratio 3:4 and their specific heats in the 4:5 . If the two liquids are mixed , the resultant temperature is |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/700-333923" style="font-weight:bold;" target="_blank" title="Click to know more about 700">700</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>`<br/>`50^@C`<br/>`40^@C`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/35-308504" style="font-weight:bold;" target="_blank" title="Click to know more about 35">35</a>^@C`</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> | |
| 39609. |
What is the direction of the angular velocity of the minute hand of a clock ? |
| 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/perpendicular-598789" style="font-weight:bold;" target="_blank" title="Click to know more about PERPENDICULAR">PERPENDICULAR</a> to the <a href="https://interviewquestions.tuteehub.com/tag/plane-1155510" style="font-weight:bold;" target="_blank" title="Click to know more about PLANE">PLANE</a> of the <a href="https://interviewquestions.tuteehub.com/tag/clock-13068" style="font-weight:bold;" target="_blank" title="Click to know more about CLOCK">CLOCK</a></body></html> | |
| 39610. |
A satellite is in an elliptical orbit around the earth with aphelion of 6R and perihelion of 2R where R = 6400 KM is the radius of the earth. Find the eccentricity of the orbit. |
| 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 Perigee `(r_p) = a(1-e) = 2R...(1)`, <a href="https://interviewquestions.tuteehub.com/tag/apogee-881815" style="font-weight:bold;" target="_blank" title="Click to know more about APOGEE">APOGEE</a> `(r_a) = a(1 +e) = 6R `..... (2)<br/>Solving (1) and (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> ` we get eccentricity (e) `=1/2`</body></html> | |
| 39611. |
A spring is stretched by applying load to its free end. The strain produced in the spring is .......... . |
| Answer» <html><body><p>volumetric<br/>shear<br/>longitudinal<br/>longitudinal and shear</p>Answer :D</body></html> | |
| 39612. |
In which condition a body lying in gravitational field is in stable equilibrium? |
| Answer» <html><body><p></p>Solution :When <a href="https://interviewquestions.tuteehub.com/tag/vertical-726181" style="font-weight:bold;" target="_blank" title="Click to know more about VERTICAL">VERTICAL</a> <a href="https://interviewquestions.tuteehub.com/tag/line-1074199" style="font-weight:bold;" target="_blank" title="Click to know more about LINE">LINE</a> through <a href="https://interviewquestions.tuteehub.com/tag/centre-912170" style="font-weight:bold;" target="_blank" title="Click to know more about CENTRE">CENTRE</a> of gravity <a href="https://interviewquestions.tuteehub.com/tag/passes-1148517" style="font-weight:bold;" target="_blank" title="Click to know more about PASSES">PASSES</a> through the base of the <a href="https://interviewquestions.tuteehub.com/tag/body-900196" style="font-weight:bold;" target="_blank" title="Click to know more about BODY">BODY</a></body></html> | |
| 39613. |
A solid cylinder of mass M and radius .R. is mounted on a frictionless horizontal axle so that it can freely rotate about this axis. A string of negligible mass is wrapped round the cylinder and a body of mass .m. is hung from the string. The mass is released from rest. Find the tension in the string and the angular speed of cylinder as the mass falls a distance h. |
| Answer» <html><body><p></p>Solution :The <a href="https://interviewquestions.tuteehub.com/tag/acceleration-13745" style="font-weight:bold;" target="_blank" title="Click to know more about ACCELERATION">ACCELERATION</a> .a. of the falling body is given by <br/>`mg-T=ma ""`……(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)<br/>Torque on the cylinder is `tau = TR = I alpha`<br/>`therefore T=(I alpha)/(R )=((<a href="https://interviewquestions.tuteehub.com/tag/mr-549185" style="font-weight:bold;" target="_blank" title="Click to know more about MR">MR</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>))/(2))((a)/(R^(2))) "" [because alpha = (a)/(R )]`<br/>or `T=(Ma)/(2)`.....(2)<br/>from (1) and (2) `T=(mMg)/((M+2m))`<br/>from <a href="https://interviewquestions.tuteehub.com/tag/consevation-424818" style="font-weight:bold;" target="_blank" title="Click to know more about CONSEVATION">CONSEVATION</a> of energy,<br/>we have `mgh = (1)/(2)mv^(2)+(1)/(2)I omega^(2)`<br/>`=(1)/(2)m (Romega)^(2)+(1)/(2)((MR^(2))/(2)).omega^(2)`<br/>on solving `omega = [(4mgh)/((M+2m)R^(2))]^((1)/(2))`<br/><img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_B_C07_SLV_071_S01.png" width="80%"/></body></html> | |
| 39614. |
Two perfectly elastic balls of same mass m are moving with velocities u_(1)" and "u_(2). They collide elastically n times. The kinetic energy of the system finally is |
| Answer» <html><body><p>`(<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) (m)/(n) u_(1)^(2)`<br/>`(1)/(2) (m)/(n) (u_(1)^(2)+u_(2)^(2))`<br/>`(1)/(2) m(u_(1)^(2)+u_(2)^(2))`<br/>`(1)/(2) <a href="https://interviewquestions.tuteehub.com/tag/mn-548487" style="font-weight:bold;" target="_blank" title="Click to know more about MN">MN</a>(u_(1)^(2)+u_(2)^(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> | |
| 39615. |
Rain is falling vertically with a speed of 30 ms^(-1). A woman rides a bicycle with a speed of 12 ms^(-1) in east to west direction. In which direction she should hold her umbrella ? |
| Answer» <html><body><p>At an <a href="https://interviewquestions.tuteehub.com/tag/angle-875388" style="font-weight:bold;" target="_blank" title="Click to know more about ANGLE">ANGLE</a> of `tan^(-1)((2)/(5))` with 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> <a href="https://interviewquestions.tuteehub.com/tag/towards-7269729" style="font-weight:bold;" target="_blank" title="Click to know more about TOWARDS">TOWARDS</a> the east.<br/>At an angle of `tan^(-1)((2)/(5))` with the vertical towards the west.<br/>At an angle of `tan^(-1)((5)/(2))` with the vertical towards the east.<br/>At an angle of `tan^(-1)((5)/(2))` with the vertical towards the west.</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> | |
| 39616. |
The moment of inertial of an uniform circular disc about its central axis I 'I' . Its M.I about a tangent in its plane is equal to |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/2i-300397" style="font-weight:bold;" target="_blank" title="Click to know more about 2I">2I</a>`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>.5I`<br/>`1.5I`<br/>`(I)/(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> | |
| 39617. |
One radian is equal to |
| Answer» <html><body><p>`(<a href="https://interviewquestions.tuteehub.com/tag/pi-600185" style="font-weight:bold;" target="_blank" title="Click to know more about PI">PI</a>)/(180)` degree <br/>`<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>^(@)`<br/>`57.295^(@)`<br/>`53.925^(@)`</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> | |
| 39618. |
The acceleration due to gravity on the planet. A is 9 times the acceleration due to the gravity on planet B. A man Jumps to a height of 2m on the surface of A. What is the height of jump by the same person on the planet B ? |
| Answer» <html><body><p>`2/3m` <br/>`2/9m`<br/>18 m <br/><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</p>Solution :`implies ` According to law of conservation of <a href="https://interviewquestions.tuteehub.com/tag/mechanical-2780" style="font-weight:bold;" target="_blank" title="Click to know more about MECHANICAL">MECHANICAL</a> energy . <br/> Kinetic energy of planet = Potential energy <br/> For planet A : <br/> `1/2 mv_A^2 = mg_(A) h_A ` <br/> For planet B: <br/> `1/2 mv_B^2 = mg_Bh_B` <br/> Suppose both planets having same orbital velocity <br/> `v_A =v_B implies1/2 mv_A^2 =1/2 mv_B^2` <br/> `:. g_A h_A = mg_B h_B` <br/> `:. h_B = (g_A) /(g_B) h_A` <br/> `= ((9g_B)/(g_B)) <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` <br/> `= 9xx 2 = 18 m`</body></html> | |
| 39619. |
Explain why a high pressure tyre roll more easily than a low pressure tyre ? |
| 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/area-13372" style="font-weight:bold;" target="_blank" title="Click to know more about AREA">AREA</a> of <a href="https://interviewquestions.tuteehub.com/tag/contact-25916" style="font-weight:bold;" target="_blank" title="Click to know more about CONTACT">CONTACT</a> is less for high pressure <a href="https://interviewquestions.tuteehub.com/tag/tyre-1434995" style="font-weight:bold;" target="_blank" title="Click to know more about TYRE">TYRE</a>.</body></html> | |
| 39620. |
A hollow metal sphere is filled with water and it is hung by along thread. It is made to oscillate. If there be a small hole in the bottom through which water slowly flows out. Then its period of oscillation is |
| Answer» <html><body><p>goes 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> until the sphere is empty <br/>goes on decreasing till the sphere is empty <br/>remains unchanged throughout<br/>first <a href="https://interviewquestions.tuteehub.com/tag/increases-1040626" style="font-weight:bold;" target="_blank" title="Click to know more about INCREASES">INCREASES</a> and later decreases and remains <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a> when the sphere is empty </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> | |
| 39621. |
A ring is cut from a platinum tube having 10 cm internal and 11 cm external diameter. It is supported horizontally from a pan of balance, so that it comes in contact with water in a glass vessel. What is the surface tension of water if an extra, 4.752gwt is required to pull it away from water ? (g=10m//s^2) |
| Answer» <html><body><p>`7.<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a> xx 10^(-2) "N/m"`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/72-334274" style="font-weight:bold;" target="_blank" title="Click to know more about 72">72</a> "N/m"`<br/>`14.4 xx 10^(-2) "N/m"`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/32-144-273643" style="font-weight:bold;" target="_blank" title="Click to know more about 144">144</a> "N/m"`</p>Answer :A</body></html> | |
| 39622. |
A ball bounces to 80% of its original height. What fraction of its mechanical energy is lost in each bounce ? What other form does it take ? |
| 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> :`1//5` <a href="https://interviewquestions.tuteehub.com/tag/th-665760" style="font-weight:bold;" target="_blank" title="Click to know more about TH">TH</a>, <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a> <a href="https://interviewquestions.tuteehub.com/tag/energy-15288" style="font-weight:bold;" target="_blank" title="Click to know more about ENERGY">ENERGY</a></body></html> | |
| 39623. |
If M is the magnetic moment, B is the magnetic induction and T is the time then MBT^(2) has the dimensions of |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/intensity-1047474" style="font-weight:bold;" target="_blank" title="Click to know more about INTENSITY">INTENSITY</a> of magnetization<br/>Intensity of <a href="https://interviewquestions.tuteehub.com/tag/magnetic-551115" style="font-weight:bold;" target="_blank" title="Click to know more about MAGNETIC">MAGNETIC</a> field<br/>Moment of Inertia<br/>Magnetic permeability</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> | |
| 39624. |
Definespectificheat capacity and giveits unit . |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/specific-1220917" style="font-weight:bold;" target="_blank" title="Click to know more about SPECIFIC">SPECIFIC</a> <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a> capacity of a substance is defined as the amount of heat energy <a href="https://interviewquestions.tuteehub.com/tag/required-1185621" style="font-weight:bold;" target="_blank" title="Click to know more about REQUIRED">REQUIRED</a> to raise the <a href="https://interviewquestions.tuteehub.com/tag/temperature-11887" style="font-weight:bold;" target="_blank" title="Click to know more about TEMPERATURE">TEMPERATURE</a> of 1 kg of a substance by 1 <a href="https://interviewquestions.tuteehub.com/tag/kelvin-1063402" style="font-weight:bold;" target="_blank" title="Click to know more about KELVIN">KELVIN</a> or `1^(@)C` <br/> `""DeltaQ=msDeltaT` <br/> `"Therefore,"s=(1)/(m)((DeltaQ)/(DeltaT))` <br/> The SI unit for specific heat capacity is `"J kg"^(-1)K^(-1)`</body></html> | |
| 39625. |
A glass tube of uniform area of cross section and open at one end encloses some air at 27^@C by a 4 cm long mercury thread that acts like a piston. When the tube is held vertical with its open end up length of the air column in the tube is 9 cm.When the open end is held downwards by turning the tube,the length of the enclosed air column becomes 10 cm. Find () the value of the atmospheric pressure (ii) the temperature at which the length of the air column becomes 9cm again,while the tube is still held inverted. |
| 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> :Let the <a href="https://interviewquestions.tuteehub.com/tag/atmospheric-887165" style="font-weight:bold;" target="_blank" title="Click to know more about ATMOSPHERIC">ATMOSPHERIC</a> pressure =pcmHg and the area of cross section of the tube =`a cm^2`[Fig.6.10] when the open end is kept upwards the <a href="https://interviewquestions.tuteehub.com/tag/volume-728707" style="font-weight:bold;" target="_blank" title="Click to know more about VOLUME">VOLUME</a> of the confined air `V_1=9 a cm^3` and pressure `p_1=(p+4) cmHg`. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/CHY_DMB_PHY_XI_P2_U07_C06_SLV_033_S01.png" width="80%"/> <br/> On <a href="https://interviewquestions.tuteehub.com/tag/inverting-7690921" style="font-weight:bold;" target="_blank" title="Click to know more about INVERTING">INVERTING</a> the tube volume of the confined air `V_2=10 a cm^3` and pressure `p_2(p-4)`cmHg. <br/> Assuming temperature to be constant at `27^@<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>` from Boyle.s law<br/> `p_1V_1=p_2V_2` <br/> or,`9a(p+4)=10a(p-4)` <br/> or,`9p+36=10p-40 , or p=76 cmHg` <br/> Suppose at `T_2K` the length of the air column becomes 9 cm again when the tube is still held inverted.Then it pressure `p_2=76-4=72 cmHg` and volume `V_2=9a cm^3`. <br/> `therefore(p_1V_1)/T_1=(p_2V_2)/T_2` <br/> or,`((76+4)times9a)/(273+27)=(72times9a)/T_2or,80/300=72/T_2`<br/>`thereforeT_2=270K=(270-273)^@C=-3^@C`</body></html> | |
| 39626. |
The temperature of a piece of iron is 27^(@)C and it is radiating energy atthe rate of QkWm^(-2). If its temperature is raised to 151^(@)C, the rate of radiation of energy will become approximately |
| Answer» <html><body><p>`2QkWm^(-<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)`<br/>`4QkWm^(-2)`<br/>`6QkWm^(-2)`<br/>`8QkWm^(-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> | |
| 39627. |
Two identical bodies at temperature T_(1) and T_(2) are bought into thermal contact. Under what conditios they come to thermal equilibrium at the mean temperature. |
| 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> :When their <a href="https://interviewquestions.tuteehub.com/tag/heat-21102" style="font-weight:bold;" target="_blank" title="Click to know more about HEAT">HEAT</a> <a href="https://interviewquestions.tuteehub.com/tag/capacities-908505" style="font-weight:bold;" target="_blank" title="Click to know more about CAPACITIES">CAPACITIES</a> are same.</body></html> | |
| 39628. |
An artificial,satellite of mass .m. is revolving around the earth, in a circular orbit of radius .r.. If the mass of the earth is.m. angular momentum of the satellite with respect to the centre of earth is (G-universal gravitational constant): |
| Answer» <html><body><p>`sqrt(GMm^(2)r)`<br/>`2msqrt(<a href="https://interviewquestions.tuteehub.com/tag/gmr-468745" style="font-weight:bold;" target="_blank" title="Click to know more about GMR">GMR</a>)`<br/>`2Msqrt(Gmr)`<br/>`sqrt((<a href="https://interviewquestions.tuteehub.com/tag/gm-1008640" style="font-weight:bold;" target="_blank" title="Click to know more about GM">GM</a>)/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</body></html> | |
| 39629. |
Aparticle moves with an initial velocity V_(0) and retardation beta V. Where 'V' is it's velocity at any time 't' ( beta is +ve constant) |
| Answer» <html><body><p>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> will cover a total distance of `(V_(<a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>))/(beta)`<br/>The particle will continue to <a href="https://interviewquestions.tuteehub.com/tag/move-548879" style="font-weight:bold;" target="_blank" title="Click to know more about MOVE">MOVE</a> for a very long time <br/>The particle will <a href="https://interviewquestions.tuteehub.com/tag/stop-1228105" style="font-weight:bold;" target="_blank" title="Click to know more about STOP">STOP</a> shortly<br/>The velocity of particle will become `(V_(0))/(2)` after time `(l <a href="https://interviewquestions.tuteehub.com/tag/n-568463" style="font-weight:bold;" target="_blank" title="Click to know more about N">N</a> 2)/(beta)`</p>Answer :A::B::D</body></html> | |
| 39630. |
The piston in the cylinder head of a locomotive has a stroke (twice the amplitude) of 1.0 m. If the piston moves with simple harmonic motion with an angular frequency of 200 rad/min, what is its maximum speed ? |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/amplitude-859568" style="font-weight:bold;" target="_blank" title="Click to know more about AMPLITUDE">AMPLITUDE</a> of piston `A= (1)/(2) <a href="https://interviewquestions.tuteehub.com/tag/cm-919986" style="font-weight:bold;" target="_blank" title="Click to know more about CM">CM</a>= 0.5 cm` and angular frequency `omega = 200 rad"/"min` <br/> Maximum <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 piston execute SHM, `v= A omega` <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> v= 0.5 xx 200` <br/> `= 100 cm"/"min = (100)/(<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>) = 1.67 cms^(-1)`.</body></html> | |
| 39631. |
In a streamline flow, (i) the speed of a particle always remains same (ii) the velocity of a particle always remains same (iii) the kinetic energies of all the particles arriving at a given point are the same (iv) the momenta of all the particles arriving at a given point are the same. |
| Answer» <html><body><p>(i),(<a href="https://interviewquestions.tuteehub.com/tag/iii-497983" style="font-weight:bold;" target="_blank" title="Click to know more about III">III</a>)<br/>(<a href="https://interviewquestions.tuteehub.com/tag/ii-1036832" style="font-weight:bold;" target="_blank" title="Click to know more about II">II</a>),(iii)<br/>(i),(iii)<br/>(iii),(<a href="https://interviewquestions.tuteehub.com/tag/iv-501699" style="font-weight:bold;" target="_blank" title="Click to know more about IV">IV</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> :D</body></html> | |
| 39632. |
A Styrofoam box, used to keep drinks cold at a picnic, has total wall area (including the lid) of 0.8m^(2) and wall thickness 2 cm. It is filled with ice, water and coca-cola at 0^(0)C. What is the rate of heat flow between the box and the surrounding and in which direction it is flowing ? Take atmospheric temperature as 30^(0)C. Thermal conductivity of Styrofoam is 0.01 W/m-K. |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/12-269062" style="font-weight:bold;" target="_blank" title="Click to know more about 12">12</a> <a href="https://interviewquestions.tuteehub.com/tag/w-729065" style="font-weight:bold;" target="_blank" title="Click to know more about W">W</a>, Out of <a href="https://interviewquestions.tuteehub.com/tag/box-401352" style="font-weight:bold;" target="_blank" title="Click to know more about BOX">BOX</a> <br/>12W, Into the box <br/>18W, Out of box <br/>18W, Into the box </p>Answer :B</body></html> | |
| 39633. |
The initial state of a certain gas is (P_i,V_i,T_i). It undergoes expansion till its volume becomes V_f Consider the following two cases : (a) the expansion takes place at constant temperature. (b) the expansion takes place at constant pressure. Plot the P-V diagram for each case. In which of the two cases, is the work done by the gas more ? |
| Answer» <html><body><p></p>Solution :The situation is shown in the <a href="https://interviewquestions.tuteehub.com/tag/given-473447" style="font-weight:bold;" target="_blank" title="Click to know more about GIVEN">GIVEN</a> P `to`V graph where variation is shown for each <a href="https://interviewquestions.tuteehub.com/tag/process-11618" style="font-weight:bold;" target="_blank" title="Click to know more about PROCESS">PROCESS</a>. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/KPK_AIO_PHY_XI_P2_C12_E04_022_S01.png" width="80%"/> <br/> Process 1 is isobaric and process 2 is isothermal. <a href="https://interviewquestions.tuteehub.com/tag/since-644476" style="font-weight:bold;" target="_blank" title="Click to know more about SINCE">SINCE</a> work done is <a href="https://interviewquestions.tuteehub.com/tag/equal-446400" style="font-weight:bold;" target="_blank" title="Click to know more about EQUAL">EQUAL</a> to the area under the P`to`V <a href="https://interviewquestions.tuteehub.com/tag/curve-941741" style="font-weight:bold;" target="_blank" title="Click to know more about CURVE">CURVE</a>, here area under the P `to`V curve 1 is more, so work done is more in isobaric process.</body></html> | |
| 39634. |
The ratio of SI unit to CGS unit of a physical constant is 10^(7). The constant is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/universal-721155" style="font-weight:bold;" target="_blank" title="Click to know more about UNIVERSAL">UNIVERSAL</a> <a href="https://interviewquestions.tuteehub.com/tag/gas-1003521" style="font-weight:bold;" target="_blank" title="Click to know more about GAS">GAS</a> constant<br/>Universal <a href="https://interviewquestions.tuteehub.com/tag/gravitational-476409" style="font-weight:bold;" target="_blank" title="Click to know more about GRAVITATIONAL">GRAVITATIONAL</a> constant<br/>Magnetic induction<br/>Impulse</p>Answer :A</body></html> | |
| 39635. |
(A) : A quick collision between two bodies is more violent 6than slow collision, even when initial and final velocities are identical.(R ) : The rate of change of momentum which determines the force is greater in quick collision. |
| Answer» <html><body><p>Both (A) and (<a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a> ) 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 explanation of (A) <br/>Both (A) and (R ) are true and (R ) is not the correct explanation of (A) <br/>(A) is true but (R ) is false <br/>(A) is false and (R ) is false </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> | |
| 39636. |
Why do the blades of an electric fan continue to ratatefor some timeafter thecurrent is switched off |
| 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/thisis-708637" style="font-weight:bold;" target="_blank" title="Click to know more about THISIS">THISIS</a> <a href="https://interviewquestions.tuteehub.com/tag/dueto-960654" style="font-weight:bold;" target="_blank" title="Click to know more about DUETO">DUETO</a> inertiamotionthat <a href="https://interviewquestions.tuteehub.com/tag/theblades-3192670" style="font-weight:bold;" target="_blank" title="Click to know more about THEBLADES">THEBLADES</a> of an electricfancontinue to rotateforsometimeevenafterthe fanhasbeenswitchedoff.</body></html> | |
| 39637. |
A mass of 2kg attached to a spring of force constant 260 Nm^(-1)makes 100 oscillation. What is the time taken ? |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a> attached on = <a href="https://interviewquestions.tuteehub.com/tag/2kg-300729" style="font-weight:bold;" target="_blank" title="Click to know more about 2KG">2KG</a> , Force <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a> k= 260 N/m <br/>`therefore T= 2 xx 3.142xx 0.0877 = 0.551 ` <a href="https://interviewquestions.tuteehub.com/tag/sec-1197209" style="font-weight:bold;" target="_blank" title="Click to know more about SEC">SEC</a><br/>Time for 100 <a href="https://interviewquestions.tuteehub.com/tag/oscillation-1139998" style="font-weight:bold;" target="_blank" title="Click to know more about OSCILLATION">OSCILLATION</a> `=100 xx 0.551 = 55.1 ` sec.</body></html> | |
| 39638. |
A uniform steel rod of length 1m and area of cross section 20 cm^2is hanging from a fixed support. Find the increase in the length of the rod. |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>.923xx10^(-<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>` <br/>`2.923xx10^(-5)cm` <br/>`1.123xx10^(-5)cm` <br/>`3.123xx10^(-5)cm` </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> :1</body></html> | |
| 39639. |
A spherical shell of copper is completely filled with a liquid at a temperature t°C. The bulk modulus of the liquid is K and coefficient of volume expansion is gamma. If the temperature of the liquid and the shell is increased by DeltaT. then the outward pressure Delta P on the shell that results from the temperature increase is given by ( alpha is the coefficient of linear expansion of the material of the shell) : |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a> ( gamma - 3alpha) Delta T`<br/>` K ( <a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a> <a href="https://interviewquestions.tuteehub.com/tag/alpha-858274" style="font-weight:bold;" target="_blank" title="Click to know more about ALPHA">ALPHA</a> - gamma) Delta T`<br/>`3 alpha ( K - gamma) Delta T`<br/>`gamma ( 3 alpha - K ) Delta T`</p>Answer :D</body></html> | |
| 39640. |
Identify the pair which has different dimensions |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/planck-601032" style="font-weight:bold;" target="_blank" title="Click to know more about PLANCK">PLANCK</a>'s constatnt and <a href="https://interviewquestions.tuteehub.com/tag/angular-11524" style="font-weight:bold;" target="_blank" title="Click to know more about ANGULAR">ANGULAR</a> <a href="https://interviewquestions.tuteehub.com/tag/momemtum-2840641" style="font-weight:bold;" target="_blank" title="Click to know more about MOMEMTUM">MOMEMTUM</a> <br/>impulse and <a href="https://interviewquestions.tuteehub.com/tag/linear-1074458" style="font-weight:bold;" target="_blank" title="Click to know more about LINEAR">LINEAR</a> momemtum<br/>angular momemtum and frequency <br/>angular <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> and frequency </p>Answer :C</body></html> | |
| 39641. |
A 400 kg satellite is in a circular orbit of radius 2 R_(E)about the Earth. How much energy is required to transfer it to a circular orbit of radius 4R_(E) ? What are the changes in the kinetic and potential energies ? |
| Answer» <html><body><p></p>Solution :Inttlally, <br/> `E_(1) =- (GM_(E)m)/(4R_(E))` <br/> whtle finally <br/> `E_(f) = - (GM_(E)m)/(8 R_(E))` <br/> The change in the total energy is <br/> `Delta E = E_(f) - E_(i)` <br/> `=(GM_(E)m)/(8 R_(E)) = ((GM_(E))/(R_(E)^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>))) (mR_(E))/(8)` <br/> `Delta E = (gmR_(E))/(8) = (9.81 xx 400 xx 6.37 xx 10^(6))/(8) = 3.13 xx 10^(9)` <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/> Thekinetic energy is reduced and it mimics `Delta`E, namely ,` Delta <a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a> = K_(f) - K_(i) = - 3.13 xx 10^(9) J. ` <br/> The change in <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 is twice the change n the total energy , namely<br/> `Delta V = V_(f) - V_(i) = - 6.25 xx 10^(9) `J</body></html> | |
| 39642. |
Sudeep and Karthideyan were roommates. Sudeepwasboilingwater in avessel forbathing purpose. KarthikeyansaidSudeep , you knowwhenyou touchthe middlepartofthe vesselcontainingwater you can feellessheat thanwhat youcan feelat the top. Sudeepwasshockedto hear.Karthikeyantook athermometerand keptit at the topsurfaceof water. The temepaturewas rising.Againheinsertedit deep into the vesselcontainingwater , now thetemperaturehas fallen downthan in the previouscondition.Whatis tehtruthbehind it ? (i) It is good to keepourhanddeep intothe vesselto checkthiswhilethe liquid is boiling ? , (ii)Whatare convectioncurrent ? |
| Answer» <html><body><p></p>Solution :The truthbehindthismagicis convectionprocess. It is a phenomenonof heattransfer in a fluid withthe actual movementof the particlesof the flud .i.e.,<a href="https://interviewquestions.tuteehub.com/tag/whena-3274932" style="font-weight:bold;" target="_blank" title="Click to know more about WHENA">WHENA</a> fluidis heatedthe hotpartexpandsandbecomeslessdense , so itrisesup andreplacesthe colderpartof fluid. Againthis fluidis heatedrisesup of replacesthe colderpartof thefluid. Thisprocessgoeson . <a href="https://interviewquestions.tuteehub.com/tag/thatis-1245000" style="font-weight:bold;" target="_blank" title="Click to know more about THATIS">THATIS</a> whywhenweboilwaterheatwillbe from <a href="https://interviewquestions.tuteehub.com/tag/top-1422115" style="font-weight:bold;" target="_blank" title="Click to know more about TOP">TOP</a> layer of the liquid to thebottomlayer.<br/> (i)No,it is notgoodtochecklike this.Asthe toplayerof fluid is not,ourhandsmustcrossthislayerfirstto moveitdeepintothe veseelcontainingwatter.so youmaygetburnsorswells.<br/> (<a href="https://interviewquestions.tuteehub.com/tag/ii-1036832" style="font-weight:bold;" target="_blank" title="Click to know more about II">II</a>) Convectioncurrentsare the constantcyclicalmotionof airwaterandothersubstanceto distributeheat . Asheatedairrises,forexampleit pullscoolerair intoitsplacewhereit can be heatedriseandpull in mostcoll air.Somegeologistsbelieveconvectioncurrentswithinthe Earth'smoltenrocks (insemi-liquid <a href="https://interviewquestions.tuteehub.com/tag/state-21805" style="font-weight:bold;" target="_blank" title="Click to know more about STATE">STATE</a>)are a contributingcause ofvolcanoeseqrthquakes andcontinentaldrift.</body></html> | |
| 39643. |
A simple pendulum with a bob of mass m oscillates from A to C and back to such that PB is H. If the acceleration due to gravity is g, then the velocity of the bob as it passes through B is……….. |
| Answer» <html><body><p>`mgH`<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>(2gH)`<br/>`2gH`<br/>zero</p>Solution :`<a href="https://interviewquestions.tuteehub.com/tag/triangle-1427233" style="font-weight:bold;" target="_blank" title="Click to know more about TRIANGLE">TRIANGLE</a> <a href="https://interviewquestions.tuteehub.com/tag/pe-590719" style="font-weight:bold;" target="_blank" title="Click to know more about PE">PE</a> = triangle KE` <br/> `mgH= (<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) mv^(2) <a href="https://interviewquestions.tuteehub.com/tag/implies-1037962" style="font-weight:bold;" target="_blank" title="Click to know more about IMPLIES">IMPLIES</a> v= sqrt(2gH)` <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P2_C14_E05_004_S01.png" width="80%"/></body></html> | |
| 39644. |
Steam at 100°C is passed into 22 grams of water at 20°C. When resultant temperature is 90°C, then weight of the water present is |
| Answer» <html><body><p>27.33g<br/>24.8g<br/>2.8g<br/>30g</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> | |
| 39645. |
Underline the correct alternative : The rate of change of total momentum of a many-particle system is proportional to the external force/sum of the internal forces on the system. |
| 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/external-981194" style="font-weight:bold;" target="_blank" title="Click to know more about EXTERNAL">EXTERNAL</a> <a href="https://interviewquestions.tuteehub.com/tag/force-22342" style="font-weight:bold;" target="_blank" title="Click to know more about FORCE">FORCE</a></body></html> | |
| 39646. |
A body dropped from a height h into the floor makes elastic collision with the floor. The frequency of oscillation of its periodic motion is |
| Answer» <html><body><p>`(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>)<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>((g)/(<a href="https://interviewquestions.tuteehub.com/tag/2h-300377" style="font-weight:bold;" target="_blank" title="Click to know more about 2H">2H</a>))`<br/>`(1)/(2)sqrt((2h)/(g))`<br/>`(1)/(2pi)sqrt((g)/(2h))`<br/>`2pisqrt((g)/(2h))`</p>Answer :A</body></html> | |
| 39647. |
The angular momentum of a wheel changes from 2L to 5L in 3 seconds. What will be the magnitude of torque acting on it? |
| Answer» <html><body><p>`(L)/(<a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a>)`<br/>`(L)/(2)`<br/>`(L)/(<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/>L</p>Solution :`tau=(<a href="https://interviewquestions.tuteehub.com/tag/dl-957543" style="font-weight:bold;" target="_blank" title="Click to know more about DL">DL</a>)/(<a href="https://interviewquestions.tuteehub.com/tag/dt-960413" style="font-weight:bold;" target="_blank" title="Click to know more about DT">DT</a>)=(L_(2)-L_(<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)=(5L-2L)/(3)=(3L)/(3)=L`</body></html> | |
| 39648. |
The following photographs are taken from the recent lunar eclipse which occurred on January 31, 2018. Is it possible to prove that Earth is a sphere from these photographs? |
| 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> :No. The <a href="https://interviewquestions.tuteehub.com/tag/moon-563673" style="font-weight:bold;" target="_blank" title="Click to know more about MOON">MOON</a> <a href="https://interviewquestions.tuteehub.com/tag/goes-2676180" style="font-weight:bold;" target="_blank" title="Click to know more about GOES">GOES</a> aroud the earth in an elliptical orbit. This means it goes around <a href="https://interviewquestions.tuteehub.com/tag/us-718298" style="font-weight:bold;" target="_blank" title="Click to know more about US">US</a>.</body></html> | |
| 39649. |
A bucket filled with water having a mass of 15kg is raised from a well of depth 12m with the help of a rope. If the work done to do so is 2160J, the linear density of the rope is (g=10ms^(-2)) |
| Answer» <html><body><p>0.2kg/m<br/>0.1 kg/m<br/>1 kg/m<br/>0.5 kg/m</p>Answer :D</body></html> | |
| 39650. |
A particle executing SHM crosses points A and B with the same velocity . Having taken 3 s in passing from A to B , it returns to B after another3 s . The time period is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/15-274069" style="font-weight:bold;" target="_blank" title="Click to know more about 15">15</a> s<br/>6 s<br/>12 s<br/>9 s </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> | |