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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.
| 36151. |
Density of a liquid .A. is 0.5 g/c.c and that of liquid .B. is g/c.c . Heat capacity of 8 litres of .A. is equal to that of 10 litres of .B.. Then their specific heats ratio is |
| Answer» <html><body><p>`4:5`<br/>`3:2`<br/>`2:3`<br/>`1:1`</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/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 36152. |
According to Newton's law of cooling, the rate of cooling of a body is proportional to (Deltatheta)^(n),"where "Deltatheta is difference of temperature of body and surroundings, and n is equal to |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/two-714195" style="font-weight:bold;" target="_blank" title="Click to know more about TWO">TWO</a> <br/>three<br/>four <br/>one</p>Answer :D</body></html> | |
| 36153. |
Elastic potential energy possessed by a spring is |
| Answer» <html><body><p>`1/2mv^(<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/><a href="https://interviewquestions.tuteehub.com/tag/mgh-1095458" style="font-weight:bold;" target="_blank" title="Click to know more about MGH">MGH</a><br/>`1/2kx^(2)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/kx-1064991" style="font-weight:bold;" target="_blank" title="Click to know more about KX">KX</a>^(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/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html> | |
| 36154. |
In which of the following cases it is certainly not possible for the diac to perform pure rolling. |
| Answer» <html><body><p>A <a href="https://interviewquestions.tuteehub.com/tag/rough-614919" style="font-weight:bold;" target="_blank" title="Click to know more about ROUGH">ROUGH</a> inclined <a href="https://interviewquestions.tuteehub.com/tag/plane-1155510" style="font-weight:bold;" target="_blank" title="Click to know more about PLANE">PLANE</a><br/>Asmooth inclined plane<br/> A smooth horizontal surface<br/>A rough horizontal surface<br/></p>Solution :In case of smooth inclined plane, speed of the disc will change <a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to component of weight along the surface but there is no force to apply torque about the <a href="https://interviewquestions.tuteehub.com/tag/centre-912170" style="font-weight:bold;" target="_blank" title="Click to know more about CENTRE">CENTRE</a> to change the angular speed accordingly. Hence it is not possible for the disc to <a href="https://interviewquestions.tuteehub.com/tag/perform-1150848" style="font-weight:bold;" target="_blank" title="Click to know more about PERFORM">PERFORM</a> pure rolling on an inclined plane. Option (b) is correct. In all other cases condition of pure rolling can be achieved.</body></html> | |
| 36155. |
Force acting on the particle moving with constant speed is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/always-373607" style="font-weight:bold;" target="_blank" title="Click to know more about ALWAYS">ALWAYS</a> zero<br/>need not be zero <br/>always non zero<br/>cannot be <a href="https://interviewquestions.tuteehub.com/tag/concluded-7266904" style="font-weight:bold;" target="_blank" title="Click to know more about CONCLUDED">CONCLUDED</a> </p>Solution :In a <a href="https://interviewquestions.tuteehub.com/tag/straight-633156" style="font-weight:bold;" target="_blank" title="Click to know more about STRAIGHT">STRAIGHT</a> line motion, velocity (speed) is <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a>, a =<a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>, F = ma = 0</body></html> | |
| 36156. |
For elastic collision, coefficient of restitution is |
| Answer» <html><body><p>0<br/>1<br/>`0ltelt1`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/oo-583684" style="font-weight:bold;" target="_blank" title="Click to know more about OO">OO</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/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 36157. |
A uniform rod of length 1 and mass m is suspended by two vertical inextensible string as shown in the fig. The tension in the left string when right string snaps, is |
| Answer» <html><body><p></p>Solution :`mg-T=ma ""…(1)` <br/> `alpha=(tau)/(I)=(mg(<a href="https://interviewquestions.tuteehub.com/tag/l-535906" style="font-weight:bold;" target="_blank" title="Click to know more about L">L</a>)/(2))/((ml^(2))/(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>))=(3g)/(2I) ""…(2)` <br/> `a=(l)/(2) alpha ….(3)` <br/> solving <a href="https://interviewquestions.tuteehub.com/tag/equation-974081" style="font-weight:bold;" target="_blank" title="Click to know more about EQUATION">EQUATION</a> (1), (2) and (3)<br/> we <a href="https://interviewquestions.tuteehub.com/tag/get-11812" style="font-weight:bold;" target="_blank" title="Click to know more about GET">GET</a> `T=(mg)/(4)` <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_NEO_CAO_PHY_XI_V01_MP2_C07_SLV_071_S01.png" width="80%"/></body></html> | |
| 36158. |
The maximum and minimum magnitude of the resultant of two vectors are 17 units and 7 units respectively. Then the magnitude of resultant of the vectors when they act perpendicular to reach other is |
| Answer» <html><body><p>14<br/>16<br/>18<br/>13</p>Answer :D</body></html> | |
| 36159. |
Ratio of distances covered by object falling freely under gravity in 1 ^(st),2^(nd)&3^(rd)second 18 ........ |
| 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>:3:5`<br/>`1:2:5`<br/>`1:4:9`<br/>`1:5:9`</p>Solution :Distance covered in `n^(<a href="https://interviewquestions.tuteehub.com/tag/th-665760" style="font-weight:bold;" target="_blank" title="Click to know more about TH">TH</a>)`second, <br/> In `d _(n) = v _(0)t + a/2 (2n -1) , v_(0) =0,` <br/> `d_(n) = (a)/(2) (2n -1)` <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> ` For `n =1, d _(1) = g /2 (<a href="https://interviewquestions.tuteehub.com/tag/2xx-1840186" style="font-weight:bold;" target="_blank" title="Click to know more about 2XX">2XX</a> 1-1) = g/2` <br/> For `n = 2, d_(2) = g/2 (2 xx 2-1) = (3g)/(2)` <br/> For `n =3, d _(3) = g/2) (2 xx 3-1) = (<a href="https://interviewquestions.tuteehub.com/tag/5g-326287" style="font-weight:bold;" target="_blank" title="Click to know more about 5G">5G</a>)/(2)` <br/> `therefore d _(1) : d_(2) :d _(3) = (g)/(2) : (3g)/(2) : (5g)/(2) = 1:3:5`</body></html> | |
| 36160. |
Statement I : Acceleration of a moving particle can change its direction without any change in the direction of velocity. Statement II : If the direction two particles moving with constant velocities always remains vector also changes. |
| Answer» <html><body><p>Statement I is <a href="https://interviewquestions.tuteehub.com/tag/true-713260" style="font-weight:bold;" target="_blank" title="Click to know more about TRUE">TRUE</a>, statement II is true , statement II is a 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> for statement I.<br/>Statement I is true statement II is true , statement II is not a correct explanation for statement I.<br/>Statement I is true, statement II is false.<br/>Statement I is false, statement II is true.</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> | |
| 36161. |
Give the quantities for which the following are the dimensions: M^(1)L^(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 href="https://interviewquestions.tuteehub.com/tag/moment-25786" style="font-weight:bold;" target="_blank" title="Click to know more about MOMENT">MOMENT</a> of <a href="https://interviewquestions.tuteehub.com/tag/inertia-1043176" style="font-weight:bold;" target="_blank" title="Click to know more about INERTIA">INERTIA</a></body></html> | |
| 36162. |
On the surface of earth, the escape velocity of a body is 11.2 km//s. If mass of earth is made half and radius becomes twice, then the escape velocity will become |
| Answer» <html><body><p>5.6 km/s<br/>22.<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a> km/s<br/>33.4 km/s<br/>11.2 km/s</p>Solution :`V_(e)` = Initial escape velocity `= <a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>((2GM)/(R ))` <br/> `V_(e) = 11.2 km//s` <br/> `V_(e)` = Final escape velocity <br/> `= sqrt((2GM)/(2(<a href="https://interviewquestions.tuteehub.com/tag/2r-300472" style="font-weight:bold;" target="_blank" title="Click to know more about 2R">2R</a>))) = sqrt((<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)/(4)(2GM)/(R ))` <br/> `V._(e) = (1)/(2)V_(e)` <br/> = 5.6 km/s</body></html> | |
| 36163. |
Three spherical balls of masses 1kg, 2kg and 3kg are placed at the corners of an equilateral triangle of side 1m. Find the magnitude of the gravitational force experted by the 2kg and 3kg masses on the 1kg mass. |
| Answer» <html><body><p></p>Solution :Mass of the spherical ball at the corner .A. of the equilateral triangle = 1kg<br/>Mass of the spherical ball at the corner .B. of the equilateral triangle = 2kg<br/>Mass of the spherical ball at the comer .C. of the equilateral triangle = 3kg<br/> Side of equilateral triangle = 1m<br/>If .<a href="https://interviewquestions.tuteehub.com/tag/f-455800" style="font-weight:bold;" target="_blank" title="Click to know more about F">F</a>. is the force of attraction between 1kg, 2kg masses then<br/>`F_1 = G <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> (1 xx 2)/((1)^2) rArr F_1 = 2G` <br/>If `.F_2.` is the force of attraction between 1kg, 3kg masses then<br/>` F_2 = G xx (1xx3)/((1)^2) rArr F_2 = 3G`<br/> The <a href="https://interviewquestions.tuteehub.com/tag/angle-875388" style="font-weight:bold;" target="_blank" title="Click to know more about ANGLE">ANGLE</a> between the forces `F_1` and `F_2`is `<a href="https://interviewquestions.tuteehub.com/tag/60-328817" style="font-weight:bold;" target="_blank" title="Click to know more about 60">60</a>^@`. If `.F_R.`is the resultant of these two forces, then according to parallelogram law of <a href="https://interviewquestions.tuteehub.com/tag/vectors-14090" style="font-weight:bold;" target="_blank" title="Click to know more about VECTORS">VECTORS</a> we can write<br/>`F_R = sqrt(F_1^2 + F_2^2 +2F_1F_2 Cos theta ) rArr F_R = sqrt((2G)^2 + (3G)^2 +2 xx 2G xx 3G xx cos 60^@) rArr F_R = sqrt19 G`</body></html> | |
| 36164. |
A boat of mass 40 kg is floating on water. A boy of mass 10 kg on the boat moves by 8 m towards the shore. What is the distance by which the boat moves away from the shore? |
| 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> :1.6 m</body></html> | |
| 36165. |
If x = a cos t is the displacement in time t then, acceleration is : |
| Answer» <html><body><p>a <a href="https://interviewquestions.tuteehub.com/tag/cos-935872" style="font-weight:bold;" target="_blank" title="Click to know more about COS">COS</a> t<br/> ` - a cos t` <br/>a sin t <br/>`- a sin t `</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/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a> = (d)/(<a href="https://interviewquestions.tuteehub.com/tag/dt-960413" style="font-weight:bold;" target="_blank" title="Click to know more about DT">DT</a>) (<a href="https://interviewquestions.tuteehub.com/tag/cost-25707" style="font-weight:bold;" target="_blank" title="Click to know more about COST">COST</a>)= - a sin t `<br/>`a = (d)/(dt) (-a sin t) = - a cos t`</body></html> | |
| 36166. |
The gas thermometers are more sensitive than liquid thermometers because |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/gases-13668" style="font-weight:bold;" target="_blank" title="Click to know more about GASES">GASES</a> expand more than liquids<br/>gases are <a href="https://interviewquestions.tuteehub.com/tag/easily-964537" style="font-weight:bold;" target="_blank" title="Click to know more about EASILY">EASILY</a> obtained<br/>gases are <a href="https://interviewquestions.tuteehub.com/tag/much-2164829" style="font-weight:bold;" target="_blank" title="Click to know more about MUCH">MUCH</a> lighter <br/>gases do not easily <a href="https://interviewquestions.tuteehub.com/tag/change-913808" style="font-weight:bold;" target="_blank" title="Click to know more about CHANGE">CHANGE</a> their states</p>Answer :A</body></html> | |
| 36167. |
When the wind blows at a high speed, the proofof a house is blown off because: |
| Answer» <html><body><p>the <a href="https://interviewquestions.tuteehub.com/tag/pressure-1164240" style="font-weight:bold;" target="_blank" title="Click to know more about PRESSURE">PRESSURE</a> under the <a href="https://interviewquestions.tuteehub.com/tag/roof-1190813" style="font-weight:bold;" target="_blank" title="Click to know more about ROOF">ROOF</a> increases<br/>Pressure above the roof increases<br/>Pressure above the roof decreses<br/>The <a href="https://interviewquestions.tuteehub.com/tag/wind-1457295" style="font-weight:bold;" target="_blank" title="Click to know more about WIND">WIND</a> <a href="https://interviewquestions.tuteehub.com/tag/pushes-1173364" style="font-weight:bold;" target="_blank" title="Click to know more about PUSHES">PUSHES</a> off the roof</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> | |
| 36168. |
A solid floats in liquid A with half its volume immersed and in liquid B with 2/3 of its volume immersed. The densities of the liquids A and B are in the ratio. |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/weight-1451304" style="font-weight:bold;" target="_blank" title="Click to know more about WEIGHT">WEIGHT</a> of liquid A <a href="https://interviewquestions.tuteehub.com/tag/displaced-440680" style="font-weight:bold;" target="_blank" title="Click to know more about DISPLACED">DISPLACED</a> is `W_A = 1/2 V rho_A <a href="https://interviewquestions.tuteehub.com/tag/g-1003017" style="font-weight:bold;" target="_blank" title="Click to know more about G">G</a>` <br/> Weight of liquid B displaced is `W_B = 2/3 rho_B g` <br/> According to Archimede.s principle `W_A = W_B` <br/> `1/2 V rho_A g = 2/3 V rho_B g` <br/> `(rho_A)/(rho_B) = 4/3`</body></html> | |
| 36169. |
The temperature of a wire is doubled. The Young's modulus of elasticity |
| Answer» <html><body><p>will <a href="https://interviewquestions.tuteehub.com/tag/also-373387" style="font-weight:bold;" target="_blank" title="Click to know more about ALSO">ALSO</a> double<br/>will become four times <br/>will <a href="https://interviewquestions.tuteehub.com/tag/remain-1184279" style="font-weight:bold;" target="_blank" title="Click to know more about REMAIN">REMAIN</a> same <br/>will <a href="https://interviewquestions.tuteehub.com/tag/decrease-946104" style="font-weight:bold;" target="_blank" title="Click to know more about DECREASE">DECREASE</a> </p>Solution :will decrease</body></html> | |
| 36170. |
In C.G.S. system the magnitude of the force is 100 dyne. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is (new units) |
| Answer» <html><body><p>0.036<br/>0.36<br/>3.6<br/>36</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> | |
| 36171. |
An oscillating simple pendulum is kept in a lift which is accelerating upwards. Will there be any change in the time period ? |
| Answer» <html><body><p></p>Solution :When the lift <a href="https://interviewquestions.tuteehub.com/tag/accelerates-846628" style="font-weight:bold;" target="_blank" title="Click to know more about ACCELERATES">ACCELERATES</a> <a href="https://interviewquestions.tuteehub.com/tag/upwards-2318352" style="font-weight:bold;" target="_blank" title="Click to know more about UPWARDS">UPWARDS</a> `g.=g+a`<a href="https://interviewquestions.tuteehub.com/tag/due-433472" style="font-weight:bold;" target="_blank" title="Click to know more about DUE">DUE</a> to increase in the value of g, T decreases.</body></html> | |
| 36172. |
A simple pendulum is swinging in a vertical plane. Its heighest point above ground is 50cm. If the maximum velocity of the pendulum is 1.4 ms^(-1), its lowest position above ground is |
| Answer» <html><body><p>20cm<br/>30cm<br/>40cm<br/>25cm</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> | |
| 36173. |
While walking on ice one should take small steps to avoid slipping. This is because smaller steps ensure |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/larger-1067345" style="font-weight:bold;" target="_blank" title="Click to know more about LARGER">LARGER</a> friction<br/>smaller friction<br/>larger <a href="https://interviewquestions.tuteehub.com/tag/normal-1123860" style="font-weight:bold;" target="_blank" title="Click to know more about NORMAL">NORMAL</a> force<br/>smaller normal force</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> | |
| 36174. |
A metal cube is placed in an empty vessel. When water is filled in the vessel so that the cube is completely immersed in the water, the force on the bottom of the vessel in contact with the cube |
| Answer» <html><body><p>Will increase<br/>Will decrease<br/>Will <a href="https://interviewquestions.tuteehub.com/tag/remain-1184279" style="font-weight:bold;" target="_blank" title="Click to know more about REMAIN">REMAIN</a> the same<br/>Will <a href="https://interviewquestions.tuteehub.com/tag/become-389953" style="font-weight:bold;" target="_blank" title="Click to know more about BECOME">BECOME</a> zero</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> | |
| 36175. |
What is the largest average velocity of blood flow in an artery of radius 2xx10^(-3)m if the flow must remain laminar > (b) What is the corresponding flow rate ? (Take vicosity of blood to be 2.084xx10^(-3)Pa s). |
| Answer» <html><body><p></p>Solution :Density of blood `rho=<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>.06xx10^(3)<a href="https://interviewquestions.tuteehub.com/tag/kgm-2769156" style="font-weight:bold;" target="_blank" title="Click to know more about KGM">KGM</a>^(-3)`<br/>Radius of the artery `r=2xx10^(-3)`<br/>The <a href="https://interviewquestions.tuteehub.com/tag/coefficient-920926" style="font-weight:bold;" target="_blank" title="Click to know more about COEFFICIENT">COEFFICIENT</a> of viscosity of blood,<br/>`eta=2.84xx10^(-3)`Pas<br/> For streamline flow `N_(R)=2000`<br/>(a) Suppose the largest <a href="https://interviewquestions.tuteehub.com/tag/average-13416" style="font-weight:bold;" target="_blank" title="Click to know more about AVERAGE">AVERAGE</a> velocity of blood is v,<br/>Reynold.s number <br/>`R_(e)=(RhovD)/(eta)`<br/>`thereforev=(R_(e)eta)/(rgoD)`<br/>`(2000xx2.084xx10^(-3))/(1.06xx10^(3)xx2xx2xx10^(-3))`<br/>`=983xx10^(-3)`<br/> `=0.983`<br/>`thereforev=0.98ms^(-1)`<br/>(b)Suppose flow ate of blood is V,<br/> `thereforeV=` arrea of cross section of artery `xx` velocity of blood <br/> `=pir^(2)xxv`<br/>`=3.14xx(2xx10^(-3))^(2)xx0.98`<br/>`=12.3xx10^(-<a href="https://interviewquestions.tuteehub.com/tag/6-327005" style="font-weight:bold;" target="_blank" title="Click to know more about 6">6</a>)`<br/>`=1.23xx10^(-5)m^(3)s^(-1)`</body></html> | |
| 36176. |
A uniform metal rod is suspended from one end. When it is displaced through 60^(@) from the vertical, the change in potential energy is .U., the change in potentialenergy when it is displaced further through 60^(@) is |
| Answer» <html><body><p>U<br/>U/2<br/>2U<br/>3U</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> | |
| 36177. |
A particle of mass m is moving in a horizontal circle of radius r, under a centripetal force equal to - (K//r^(2)), where K is constant. What is the total energy of the particle ? |
| 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>)/( <a href="https://interviewquestions.tuteehub.com/tag/r-611811" style="font-weight:bold;" target="_blank" title="Click to know more about R">R</a>)`<br/>`-(k)/(<a href="https://interviewquestions.tuteehub.com/tag/2r-300472" style="font-weight:bold;" target="_blank" title="Click to know more about 2R">2R</a>)`<br/>`-(k)/(r )`<br/>`(k)/(2r)`</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> | |
| 36178. |
A block of metal weighing 2kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg//s and at a speed of 5 m//s. The initial acceleration of the block will be |
| Answer» <html><body><p>`2.5m//s^(2)`<br/>`5m//s^(2)`<br/>`10m//s^(2)`<br/>`20m//s^(2)`</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/f-455800" style="font-weight:bold;" target="_blank" title="Click to know more about F">F</a>=(dp)/(<a href="https://interviewquestions.tuteehub.com/tag/dt-960413" style="font-weight:bold;" target="_blank" title="Click to know more about DT">DT</a>), F=v(<a href="https://interviewquestions.tuteehub.com/tag/dm-432223" style="font-weight:bold;" target="_blank" title="Click to know more about DM">DM</a>)/(dt), a=(F)/(m)`</body></html> | |
| 36179. |
the frequency of oscillation of mass .m. suspended by a spring is n_(1). If the spring is made half, the same mass oscillates with the frequency n_(2). Then the value of n_(2) is |
| Answer» <html><body><p>`n_(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>`<br/>`2n_(1)`<br/>`sqrt(2)n_(1)`<br/>`(n_1)/(sqrt(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/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html> | |
| 36180. |
The value of acceleration due to gravity .g_p. on the surface of a planet with radius double that of earth and same mean density as that of the earth is (g_e to acceleration due to gravity on the surface of earth) |
| Answer» <html><body><p>`g_p=2g_e`<br/>`g_p=g_e//2`<br/>`r_p=g_e//4`<br/>`g_p=4g_e` </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> | |
| 36181. |
A capillary tube of radius r and height h_(1) is connected to a broad tube of large height as shown in the figure. Water is poured into the broad tube – drop by drop. Drops fall at regular intervals. Plot the variation of height of water in both tubes with time. Initially the tube and capillary are empty. Neglect the volume of the connecting pipe. |
| 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> :`(##IJA_PHY_V01_C09_E01_033_A01##)`</body></html> | |
| 36182. |
Two particles move parallel tox-axis about the origin with same amplitude 'a' and for omega . At a certain instant they are found at a distance a/3 from the origin on opposite sides but localities are in the same direction. What is the phase difference between the two? |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/cos-935872" style="font-weight:bold;" target="_blank" title="Click to know more about COS">COS</a>^(-<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>) 7/9`<br/>`cos^(-1) 5/9`<br/>`cos^(-1) 4/9`<br/>`cos^(-1)1/9`</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> | |
| 36183. |
Which of the following is meaningful ? |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/vector-20923" style="font-weight:bold;" target="_blank" title="Click to know more about VECTOR">VECTOR</a>/Vector <br/>`("<a href="https://interviewquestions.tuteehub.com/tag/scalar-629745" style="font-weight:bold;" target="_blank" title="Click to know more about SCALAR">SCALAR</a>")/("vector")`<br/>Scalar + vector <br/>vector/ scalar</p>Answer :D</body></html> | |
| 36184. |
The motion of a particle along a straight line is described by the function s=6+4^(2)-t^(4) in SI units. Find the velocity, acceleration, at t=2s, and the average velocity during 3^(rd) seconds. |
| Answer» <html><body><p></p>Solution :`s=6+4t^(2)-t^(<a href="https://interviewquestions.tuteehub.com/tag/4-311707" style="font-weight:bold;" target="_blank" title="Click to know more about 4">4</a>)` <br/> Velocity `=(ds)/(dt)=8t-4t^(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)" when "t=2` <br/> Velocity `=8xx2-4xx2^(3)` <br/> Velocity `=-16m//s` <br/> Acceleration `a=(d^(2)s)/(dt^(2))=8-12t^(2)" when "t=2` <br/> acc `=8-12xx2^(2)=-40` <br/> acc `=-40m//s^(2)` <br/> displacement in 2 seconds <br/> `s_(1)=6+4.2^(2)-2^(4)=6m` <br/> displacement in 3 seconds <br/> `s_(2)=6+4.3^(2)-3^(4)=-39m` <br/> displacement during `3^(rd)` <a href="https://interviewquestions.tuteehub.com/tag/second-1197322" style="font-weight:bold;" target="_blank" title="Click to know more about SECOND">SECOND</a> <br/> `=s_(2)-s_(1)=-39-6=-45m` <br/> `therefore` <a href="https://interviewquestions.tuteehub.com/tag/average-13416" style="font-weight:bold;" target="_blank" title="Click to know more about AVERAGE">AVERAGE</a> velocity during `3^(rd)` second <br/> `=(pm45)/(1)=-45m//s` <br/> `-ve` <a href="https://interviewquestions.tuteehub.com/tag/sign-1207134" style="font-weight:bold;" target="_blank" title="Click to know more about SIGN">SIGN</a> indicates that the body is moving in opposite direction to the initial direction of motion.</body></html> | |
| 36185. |
The speed of a solid sphere after rolling down from rest without sliding on an inclined plane of vertical height h is |
| Answer» <html><body><p>`sqrt((4)/(<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/gh-468237" style="font-weight:bold;" target="_blank" title="Click to know more about GH">GH</a>)`<br/>`sqrt((10)/(<a href="https://interviewquestions.tuteehub.com/tag/7-332378" style="font-weight:bold;" target="_blank" title="Click to know more about 7">7</a>)gh)`<br/>`sqrt(2gh)`<br/>`sqrt((1)/(2)gh)`</p>Answer :A</body></html> | |
| 36186. |
A solid sphere, a hollow sphere and a disc, all having samc mass and radius, are placed at the top of an incline and released. The friction coefficients between the objects and the incline are same and not sufficient to allow pure rolling. Least time will be taken in reaching the bottom by |
| Answer» <html><body><p> the <a href="https://interviewquestions.tuteehub.com/tag/solid-1216587" style="font-weight:bold;" target="_blank" title="Click to know more about SOLID">SOLID</a> <a href="https://interviewquestions.tuteehub.com/tag/sphere-1222094" style="font-weight:bold;" target="_blank" title="Click to know more about SPHERE">SPHERE</a><br/>the <a href="https://interviewquestions.tuteehub.com/tag/hollow-1028416" style="font-weight:bold;" target="_blank" title="Click to know more about HOLLOW">HOLLOW</a> sphere<br/> the disc<br/>all will <a href="https://interviewquestions.tuteehub.com/tag/take-662846" style="font-weight:bold;" target="_blank" title="Click to know more about TAKE">TAKE</a> same time</p>Answer :D</body></html> | |
| 36187. |
The momentum of a body is doubled. By what percentage does its kinetic energy increase ? |
| 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>Solution :`<a href="https://interviewquestions.tuteehub.com/tag/k-527196" style="font-weight:bold;" target="_blank" title="Click to know more about K">K</a>=(p^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>))/(<a href="https://interviewquestions.tuteehub.com/tag/2m-300757" style="font-weight:bold;" target="_blank" title="Click to know more about 2M">2M</a>)rArr (K_(1))/(K_(2))=(p_(1)^(2))/(p_(2)^(2))`<br/>Let `K_(1)=K, p_(1)=p` then `p_(2)=2p, K_(2)=?`<br/>`(K)/(K_(2))=(p^(2))/((2p)^(2)), K_(2)=4K`.<br/>% increase in kinetic energy = `("Increase in kinetic energy")/("Initial kinetic energy")<a href="https://interviewquestions.tuteehub.com/tag/xx100-3292680" style="font-weight:bold;" target="_blank" title="Click to know more about XX100">XX100</a>`<br/>`(K_(2)-K_(1))/(K_(1))xx100=(4K-K)/(K)xx100=300%`</body></html> | |
| 36188. |
What is the order of age of earth ? |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/age-851457" style="font-weight:bold;" target="_blank" title="Click to know more about AGE">AGE</a> of earth is of the order is `<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/17-278001" style="font-weight:bold;" target="_blank" title="Click to know more about 17">17</a>)s.`</body></html> | |
| 36189. |
A vertical cylinder of height 100 cm contains air at a constant temperature and its top is closed by a frictionless pistion at atmospheric pressure (76 cm of Hg) as shown figure ( a). If mercury is slowly poured on the pistion, due to its weight air is compressed. Find the maximum height of the mercury column which can be put on the pistion. |
| Answer» <html><body><p></p>Solution :When mercury is poured on the top of the piston, due to increase in pressure, the volume of air wiU decrease according to Boyle.s law. If <a href="https://interviewquestions.tuteehub.com/tag/final-461168" style="font-weight:bold;" target="_blank" title="Click to know more about FINAL">FINAL</a> mercury column of height <a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a> is poured on the <a href="https://interviewquestions.tuteehub.com/tag/pistion-2929643" style="font-weight:bold;" target="_blank" title="Click to know more about PISTION">PISTION</a> then <a href="https://interviewquestions.tuteehub.com/tag/gas-1003521" style="font-weight:bold;" target="_blank" title="Click to know more about GAS">GAS</a> pressure in equilibrium can be given as `P_(f) = (76 + x) ` <a href="https://interviewquestions.tuteehub.com/tag/cm-919986" style="font-weight:bold;" target="_blank" title="Click to know more about CM">CM</a> of Hg <br/> As at1nospheric pressure is equivalent to the pressure due to a mercury column of height 76cm. If A be the area of cross secion of cylinder then we have according to Boyle.s law `P_(1) V_(1) = P_(2) V_(2) ` or <br/> `(76) (100 A) = (76 + x) (100 - x) A ` or <br/> `7600 = 7600 + 24 x - x^(2) " or " x = 24 ` cm .</body></html> | |
| 36190. |
A body of mass 100gm is performing SHM with a period of 4.5sec and amplitude 7cm. Velocity of the body at equilibrium position in cm/sec is approximately |
| Answer» <html><body><p>10<br/>8<br/>6<br/>5</p>Answer :A</body></html> | |
| 36191. |
Bubble in air have …… free surface |
| 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/two-714195" style="font-weight:bold;" target="_blank" title="Click to know more about TWO">TWO</a></body></html> | |
| 36192. |
A horizontal platform with an object placed on it is executing SHM in the vertical direction. The amplitude of oscillation is 3.92xx 10^(-3)m. What must be the least period of these oscillations, so that the object is not detached from the platform? |
| Answer» <html><body><p>`0.1256 s`<br/>`0.1356 s`<br/>`0.1456 s`<br/>`0.1556 s`</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> :According to <a href="https://interviewquestions.tuteehub.com/tag/figure-987693" style="font-weight:bold;" target="_blank" title="Click to know more about FIGURE">FIGURE</a> `<a href="https://interviewquestions.tuteehub.com/tag/mg-1095425" style="font-weight:bold;" target="_blank" title="Click to know more about MG">MG</a>-R = ma` (a= acceleration) <br/> For `R= 0, mg= ma implies mg= m A omega^(<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/> `implies omega = sqrt(g"/"A) = sqrt((9.8)/(3.92xx 10^(-3)))= 50` <br/> `implies T= (2pi)/(omega)= (2pi)/(50)= 0.1256s`. <br/> <img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P2_C14_E06_005_S01.png" width="80%"/></body></html> | |
| 36193. |
Two particles of masses 4kg and 8kg are kept at x=-2m and x=4m respectively. Then the net gravitational force acting on a third particle of mass 1kg kept at the origin is |
| Answer» <html><body><p>G<br/>2G<br/>`G//2`<br/>`G//4`</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> | |
| 36194. |
A body starts from rest and moves with uniform acceleration of 5ms^(-2) for 8 seconds. From that time the acceleration ceases. Find the distance covered in 12s starting from rest. |
| Answer» <html><body><p></p>Solution :The <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> after 8 seconds `v=0+5xx8=40m//s` <br/> Distance covered in 8 seconds <br/> `s_(0)=0+(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>)xx5xx64=160n` <br/> After <a href="https://interviewquestions.tuteehub.com/tag/8s-340210" style="font-weight:bold;" target="_blank" title="Click to know more about 8S">8S</a> the body moves with <a href="https://interviewquestions.tuteehub.com/tag/uniform-1437485" style="font-weight:bold;" target="_blank" title="Click to know more about UNIFORM">UNIFORM</a> velocity and distance covered in 4s with uniform velocity is <br/> `S=vt=40xx4=160m` <br/> The distance covered in `12s=160+160=320m`</body></html> | |
| 36195. |
A stone is dropped from a hill of height 180m. Two seconds later another stone is dropped from a point P below the top of the hill. If the two stones reach the ground simultaneously, the height of P from the ground is |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a> m<br/>90 m<br/>80 m<br/>90 m</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> | |
| 36196. |
Convert the unit of work done from MKS system to CGS system (i.e. joule ) |
| Answer» <html><body><p></p>Solution :Dimensional formula of energy is `M^(1) L^(2) T^(2)`. <br/> Let `IJ = n "ergs" <a href="https://interviewquestions.tuteehub.com/tag/rarr-1175461" style="font-weight:bold;" target="_blank" title="Click to know more about RARR">RARR</a> n = J// "ergs"` <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> n_(2) = n_(1) [(M_1)/(M_2) ]^(1) [(L_1)/(L_2) ]^(2) [(T_1)/(T_2)]^(-2)` <br/> `rArr n = [ (1kg)/(1g) ] [(1 m)/( 1cm)]^(-2) [ (1s)/( 1s) ]^(-2) ((n_2)/(n_1) = n)` <br/> `rArr n= [ (1000g)/( 1g) ] [ (<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a> cm)/( 1cm ) ]^(2) [(1s)/( 1s) ]^(-2) ` <br/> `rArr n= [<a href="https://interviewquestions.tuteehub.com/tag/1000-265236" style="font-weight:bold;" target="_blank" title="Click to know more about 1000">1000</a>] xx [ 100]^(2) xx [1]^(2) = 10^(7)` <br/> `therefore 1 "joule" = 10^(7) "ergs"`</body></html> | |
| 36197. |
Consider three solid spheres, sphere (i) has radius r and mass m, sphere (ii) has radius r and mass 3 m, sphere (iii) has radius 3r and mass m, All can be placed at the same point on the same inclined plane, where they will roll without slipping to the bottom, If allowed to roll down the incline, then at the bottom of the incline |
| Answer» <html><body><p>sphere (i) will have the largest speed<br/>sphere (<a href="https://interviewquestions.tuteehub.com/tag/ii-1036832" style="font-weight:bold;" target="_blank" title="Click to know more about II">II</a>) will havethe largest speed<br/>sphere (iii) will have the largest kinetic energy<br/>all the sphere will have equal speeds.</p>Solution :Acceleration, `a=(g sin theta)/(1+(I)/(mv^(2)))` <br/> For a sphere, `(I)/(mv^(2))=(2)/(<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/> Hence, `a=(5)/(7)g sin theta=` constant, <br/> Hence, speed of all sphere is same at the <a href="https://interviewquestions.tuteehub.com/tag/bottom-401202" style="font-weight:bold;" target="_blank" title="Click to know more about BOTTOM">BOTTOM</a>. Sphere (ii) has the largest <a href="https://interviewquestions.tuteehub.com/tag/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a>. Hence, it will have the maximum kinetic energy.</body></html> | |
| 36198. |
On the arrangement shown in figure Pulleys are small light and springs are ideal K_1 , K_2 , K_3 and K_4 are force constant of the springs calculate period of small vertical oscillations of block of mass 'm' |
| Answer» <html><body><p><br/></p>Solution :If the <a href="https://interviewquestions.tuteehub.com/tag/block-18865" style="font-weight:bold;" target="_blank" title="Click to know more about BLOCK">BLOCK</a> is pulled down by a <a href="https://interviewquestions.tuteehub.com/tag/small-1212368" style="font-weight:bold;" target="_blank" title="Click to know more about SMALL">SMALL</a> displacement x and <a href="https://interviewquestions.tuteehub.com/tag/released-613817" style="font-weight:bold;" target="_blank" title="Click to know more about RELEASED">RELEASED</a> , extra tension provides restoring force<br/>Let T be the extra tension <br/>Then T = ma <br/> If `x_1 , x_2 , x_3 and x_4` are the extensions of springs. <br/>`2T = K_1 x_1 = K_2x_2 = K_3 x_3= K_4 x_4` <br/>`x=2(x_1 + x_2 + x_3+x_4)` <br/>`x= <a href="https://interviewquestions.tuteehub.com/tag/4t-319060" style="font-weight:bold;" target="_blank" title="Click to know more about 4T">4T</a> (1/(K_1) + 1/(K_2) + 1/(K_3) + 1/(K_4))` <br/>from T = ma <br/>`4m(1/(K_1) + 1/(K_2) + 1/(K_3) + 1/(K_4)) a= x , omega = <a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(a/x) and T = (2pi)/(omega)`</body></html> | |
| 36199. |
The vector product of two non-zero vectors will be minimum when theta is equal to |
| Answer» <html><body><p>(a) `<a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>^(@)`<br/>(b) `180^(@)`<br/>(<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>) both (a) and (b)<br/>(d) <a href="https://interviewquestions.tuteehub.com/tag/neither-1113494" style="font-weight:bold;" target="_blank" title="Click to know more about NEITHER">NEITHER</a> (a) nor (b)</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::B::D</body></html> | |
| 36200. |
A moving particle of mass .m. makes head-on elastic collision with a particle of mass .2m. which is initialy at rest. The fraction of K.E. lost by colliding particle is |
| Answer» <html><body><p>`1//3`<br/>`1//9`<br/>`8//9`<br/>`2//3`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html> | |