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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.
| 35501. |
Force constants of two wires A and B of the same material are k and 2k respectively. If the two wires are stretched equally, then the ratio of workdone in stretching (( W_A)/( W_B) ) is |
| Answer» <html><body><p>`1/4`<br/>`1/3`<br/>`1/2`<br/>`3/2`</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> | |
| 35502. |
The following graphs represent velocity- time graph. Identify what kind of motion a particle undergoes in each graph |
| 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)`vec(a) `- constant<br/>(<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) `vec(<a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a>) -`constant<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>)`vec(a)` - constant but greater than first graph<br/>(d) `vec(a)` - variable</body></html> | |
| 35503. |
If eta =(A)/(B)log (Bx + C) is dimensionally true, then (here h is the coefficient of viscosity and x is the distance) |
| Answer» <html><body><p>C is dimensionless constant <br/>B has dimensions of -<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a> in length <br/>the <a href="https://interviewquestions.tuteehub.com/tag/dimensional-2582799" style="font-weight:bold;" target="_blank" title="Click to know more about DIMENSIONAL">DIMENSIONAL</a> formula of A is `<a href="https://interviewquestions.tuteehub.com/tag/ml-548251" style="font-weight:bold;" target="_blank" title="Click to know more about ML">ML</a>^(-2)T^(-1)`<br/>all the above are true </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> | |
| 35504. |
The angular frequency of a fan of moment of inertia 0.1kg mo is increased from 30 rpm to 60 rpm when a torque of 0.03 Nm acts on it. Find the number revolutions made by the fan while the angular frequency is increased from 30 rpm to 60 rpm. |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/work-20377" style="font-weight:bold;" target="_blank" title="Click to know more about WORK">WORK</a> done `=(1)/(2)I(omega_(<a href="https://interviewquestions.tuteehub.com/tag/f-455800" style="font-weight:bold;" target="_blank" title="Click to know more about F">F</a>)^(2)-omega_(i)^(2))tautheta=(1)/(2)I(omega_(f)^(2)-omega_(i)^(2))` <br/> `theta=(1)/(2)((I)/(tau))(omega_(f)^(2)-omega_(i)^(2))=(0.1)/(2xx0.03)((2pi)^(2)-<a href="https://interviewquestions.tuteehub.com/tag/pi-600185" style="font-weight:bold;" target="_blank" title="Click to know more about PI">PI</a>^(2))=5pi^(2)` <br/> The number of revolutions, `(theta)/(2pi)=(5pi^(2))/(2pi)=(5pi)/(2)=7.855rev`</body></html> | |
| 35505. |
Explain how geocentric theory is replaced by heliocentric theory using the idea of retrograde motion of planets. |
| Answer» <html><body><p></p>Solution :(i) During the observation of motion of the planets it is in the night sky by naked eyes over a period of a few months, it can be seen that the planets move eastwards and reverse their motion for a while and return to eastward motion again. This is called "retrograde motion" of planets.<br/>(ii) Ptolemy introduced the concept of "epicycle" in his geocentric model. To explain this retrograde motion, according to this theory, while the planet orbited the Earth, it also underwent another circular motion <a href="https://interviewquestions.tuteehub.com/tag/termed-7331110" style="font-weight:bold;" target="_blank" title="Click to know more about TERMED">TERMED</a> as "epicycle". A combination of epicycle and circular motion <a href="https://interviewquestions.tuteehub.com/tag/around-5602275" style="font-weight:bold;" target="_blank" title="Click to know more about AROUND">AROUND</a> the Earth gave rise to retrograde motion of the planets with respect to Earth.<br/>(iii) But Ptolemy's model became more and more complex as every planet was found to undergo retrograde motion.<br/>(<a href="https://interviewquestions.tuteehub.com/tag/iv-501699" style="font-weight:bold;" target="_blank" title="Click to know more about IV">IV</a>) According to heliocentric model, the Sun is at the centre of the solar system and all planets orbited the Sun. The retrograde motion of planets with respect to Earth is due to the relative motion of the planet with respect to Earth. The retrograde motion from the heliocentric point of view.<br/><img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/PRE_GRG_PHY_XI_V02_C06_E01_044_S01.png" width="80%"/> <br/>The Earth orbits around the Sun faster than Mars. Due to the relative motion between Mars and Earth, Mars <a href="https://interviewquestions.tuteehub.com/tag/appears-881937" style="font-weight:bold;" target="_blank" title="Click to know more about APPEARS">APPEARS</a> to move backwards from July to October. In the same way the retrograde motion of all other planet was explained successfully by the Copernicus model. The heliocentric model slowly <a href="https://interviewquestions.tuteehub.com/tag/replaced-613867" style="font-weight:bold;" target="_blank" title="Click to know more about REPLACED">REPLACED</a> the geocentric model, because of its simplicity.</body></html> | |
| 35506. |
How is surface tension related to surface energy? |
| 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> :The surface energy per unit area of a surface is numerically <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 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>.</body></html> | |
| 35507. |
The energy would be …. If 1 large drop of water drop splitting into 8 small drop of water. |
| 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> :False .For <a href="https://interviewquestions.tuteehub.com/tag/non-580180" style="font-weight:bold;" target="_blank" title="Click to know more about NON">NON</a> -<a href="https://interviewquestions.tuteehub.com/tag/viscous-1447063" style="font-weight:bold;" target="_blank" title="Click to know more about VISCOUS">VISCOUS</a> fluid `eta=0`<br/> `therefore` From `R_(<a href="https://interviewquestions.tuteehub.com/tag/e-444102" style="font-weight:bold;" target="_blank" title="Click to know more about E">E</a>)=(rhovD)/(eta),R_(e)` = infinite <br/>Hence , such type of <a href="https://interviewquestions.tuteehub.com/tag/flow-993213" style="font-weight:bold;" target="_blank" title="Click to know more about FLOW">FLOW</a> can never be a streamline.</body></html> | |
| 35508. |
A cricket ball of mass 100 g moving with a speedof 20 ms^(-1) is brought to restby a player . Find the changein momentum of ball. |
| Answer» <html><body><p>`0.5 Ns ` <br/>`-2 Ns ` <br/>`-2.5Ns ` <br/><a href="https://interviewquestions.tuteehub.com/tag/zero-751093" style="font-weight:bold;" target="_blank" title="Click to know more about ZERO">ZERO</a> </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> = 0.1kg <br/> intial <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> `mu = 20 ms^(-<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/> Final velocity v = 0 <br/> change in momentum in impulse= m(v - u) = 0.1 (0-20)= - <a href="https://interviewquestions.tuteehub.com/tag/2ns-1838421" style="font-weight:bold;" target="_blank" title="Click to know more about 2NS">2NS</a></body></html> | |
| 35509. |
Two small balls of the same size and of masses m_(1) and m_(2) (m_(1) gt m_(2)) are tied by a thin weightless thread and dropped from a balloon. The tension T of the thread during the flight towards the ground after the motion of the balls has become steady state is (steady state means that the balls are coming down with uniform velocity due to the forces weight, air friction and upthrust). Consider that air is still without any wind below, during the motion of the balls through air: |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/zero-751093" style="font-weight:bold;" target="_blank" title="Click to know more about ZERO">ZERO</a><br/>`((m_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)-m_(<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/g-1003017" style="font-weight:bold;" target="_blank" title="Click to know more about G">G</a>)/2`<br/>`((m_(1)+m_(2))g)/2`<br/>`m_(1)g`</p>Solution :`2T=(m_(1)-m_(2))g`</body></html> | |
| 35510. |
Motion of a coin on a carrom board is an example of |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/one-585732" style="font-weight:bold;" target="_blank" title="Click to know more about ONE">ONE</a> <a href="https://interviewquestions.tuteehub.com/tag/dimensional-2582799" style="font-weight:bold;" target="_blank" title="Click to know more about DIMENSIONAL">DIMENSIONAL</a> motion<br/>one dimensional motion<br/>three dimensional motion<br/>none </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::D</body></html> | |
| 35511. |
What is water equivalent? |
| 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/water-1449333" style="font-weight:bold;" target="_blank" title="Click to know more about WATER">WATER</a> equivalent is numerically equal to thermal capacity of substance in CGS units and <a href="https://interviewquestions.tuteehub.com/tag/expressed-7259249" style="font-weight:bold;" target="_blank" title="Click to know more about EXPRESSED">EXPRESSED</a> in grams of water. <br/> Eg: If heal capacity of a substance is 60 <a href="https://interviewquestions.tuteehub.com/tag/cal-412083" style="font-weight:bold;" target="_blank" title="Click to know more about CAL">CAL</a> `""^(0)C^(+)`, then its water equivalent is 60 <a href="https://interviewquestions.tuteehub.com/tag/gram-1010695" style="font-weight:bold;" target="_blank" title="Click to know more about GRAM">GRAM</a>.</body></html> | |
| 35512. |
There is a small hole in a table. A string of length 1m passes through it. Two bodies of masses 70g and 100g are attached at its ends. The 100g mass hangs freely at a depth of 60 cm from the table. If this mass is to be in equilibrium, the other mass should rotate in a circle with a frequency equal to |
| Answer» <html><body><p>`4 pi// <a href="https://interviewquestions.tuteehub.com/tag/140-273392" style="font-weight:bold;" target="_blank" title="Click to know more about 140">140</a> <a href="https://interviewquestions.tuteehub.com/tag/hz-493442" style="font-weight:bold;" target="_blank" title="Click to know more about HZ">HZ</a>` <br/>`pi//140 Hz ` <br/>`pi//sqrt140 Hz ` <br/>`(sqrt140)/(4pi) Hz ` </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> | |
| 35513. |
When a fluid passes through the constricted part of a pipe, its………….. . |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> and <a href="https://interviewquestions.tuteehub.com/tag/pressure-1164240" style="font-weight:bold;" target="_blank" title="Click to know more about PRESSURE">PRESSURE</a> <a href="https://interviewquestions.tuteehub.com/tag/decreases-946143" style="font-weight:bold;" target="_blank" title="Click to know more about DECREASES">DECREASES</a> <br/>velocity and pressure increase <br/>velocity decreases and pressure <a href="https://interviewquestions.tuteehub.com/tag/increases-1040626" style="font-weight:bold;" target="_blank" title="Click to know more about INCREASES">INCREASES</a> <br/>velocity increases and pressure decreases </p>Answer :D</body></html> | |
| 35514. |
The densities of two substances are in the ratio 5 : 6 and the specific heats are in the ratio 3:5 respectively. The ratio of their thermal capacities per unit volume is |
| Answer» <html><body><p>`2:1`<br/>`1:2`<br/>`4:1`<br/>`1:4`</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/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a></body></html> | |
| 35515. |
A particle slides down from rest on an inclined planet of angle theta with horizontal and the distances are as shown. The particle slides down from top to the position A, where it's velocity is v. Then below correct options are |
| Answer» <html><body><p>`(<a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a>^(<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>)-2gH)` will remain constant<br/>`(V^(2)-2gSsin <a href="https://interviewquestions.tuteehub.com/tag/theta-1412757" style="font-weight:bold;" target="_blank" title="Click to know more about THETA">THETA</a>)` will remain constant<br/>`[V^(2)-2gS[H-h)/(p-s)]` will remain constant<br/>`[V^(2)-(2gSH)/p]` will remain constant</p>Answer :A::B::<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a>::D</body></html> | |
| 35516. |
Using the following data, calculate refractive index of the material of convex lens. Radii of curvature of both the surfacea are 0.2 m.Data recorded in the displacement//shift method to determine focal length of convex lens is shown here. |
| Answer» <html><body><p></p>Solution :`f_1 = (D_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> - x_1^2)/(4 D_1) = (0.82^2 - 0.128^2)/(4 <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> 0.82) = 0.2 m` <br/> `f_2 = (D_2^2 - x_2^2)/(4 D_2) = (0.9^2 - 0.3^2)/(4 xx 0.9) = 0.2 m` <br/> `:.` <a href="https://interviewquestions.tuteehub.com/tag/average-13416" style="font-weight:bold;" target="_blank" title="Click to know more about AVERAGE">AVERAGE</a> <a href="https://interviewquestions.tuteehub.com/tag/focal-2648683" style="font-weight:bold;" target="_blank" title="Click to know more about FOCAL">FOCAL</a> length, <br/> `f - (f_1 + f_2)/(2) = (0.2 + 0.2)/(2) = 0.2 m` <br/> Now, `R_1 = 0.2 m, R_2 = -0.2 m, mu = ?` <br/> From `(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)/(f) = (mu - 1)((1)/(R_1) - (1)/(R_2))` <br/> `(1)/(0.2)=(mu - 1) ((1)/(0.2) + (1)/(0.2)) = (mu - 1)/(0.1)` <br/> `mu - 1 = (1)/(2), mu = (1)/(2) + 1 = 1.5`.</body></html> | |
| 35517. |
When a body is projected vertically up from ground, the ratio of its potential to kinetic energies at a height .h. above the ground is 3:4. The height above ground at which the ratio of potential to kinetic energies becomes 4:3 is |
| Answer» <html><body><p>`3:25`<br/>`3:28`<br/>`1:20`<br/>`1:25`</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> | |
| 35518. |
What is the angular displacement made by a particle after 5s, when it starts from rest with an angular acceleration 0.2 and s^(-2) ? |
| Answer» <html><body><p>4rad <br/>1 rad <br/>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> rad <br/>5 rad </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> :From equation of circular motion `omega = <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/> ` theta= omega t + 1/2 prop t^2` <br/> ` theta = 1/2 prop t^2 = 1/2 <a href="https://interviewquestions.tuteehub.com/tag/xx-747671" style="font-weight:bold;" target="_blank" title="Click to know more about XX">XX</a> 0.2(5)^2 = 2.5 rad `</body></html> | |
| 35519. |
Passage - II : Liquids do not have definite shape and size, they are taken in a vessel. Their expansion (or) contraction takes place with respect to the container in which they arc considered. The volume coefficient of expansion relative to the vessel is termed as coefficient of apparent expansion ( gamma_(a) ) and the volume coefficient of expansion of the liquid is termed as absolute ( gamma_(R) "or" gamma_(L ) ). In some of the arrangements mentioned as per the instructions. solve the problems. A metallic scale reads correct values at 0°C. It registers the height of liquid in the vessel (cylindrical shape) at 0°C as h_0. If gamma_( C), gamma_( L) are the coefficients of cubical expansion of metallic scale and liquid respectively and alpha_(S) is the coefficient of linear expansion of the material of the cylindrical vessel made of material different to that of the scale, then the scale reading. Registering the height of the liquid in the vessel as function of temperature ( theta ) of the surroundings is |
| Answer» <html><body><p>`h_( theta ) = h_( <a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>) [ <a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a> - ( gamma_( C ) - gamma_( L ) - 2alpha_(S)) theta ]`<br/>`h_( theta ) = h_(0) [ 1 - ( gamma_( C) - gamma_( 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> alpha_(s)) theta ]`<br/>`h_(theta) = h_(0) [ 1 - ( gamma_( C ) - gamma_( L ) + alpha_( S)) theta ]`<br/>`h_( theta ) = h_(0)[1 - ( gamma_( C ) - gamma_( L ) - alpha_(S)) theta ]`</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> | |
| 35520. |
A bimetal made of copper and iron strips welded together is straight at room temperature. It is held vertically so that the iron strip is towards the left hand and copper strip istowards right hand. The bimetal strip is then heated. The bimetal strip |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/remains-621920" style="font-weight:bold;" target="_blank" title="Click to know more about REMAINS">REMAINS</a> straight <br/><a href="https://interviewquestions.tuteehub.com/tag/bends-895118" style="font-weight:bold;" target="_blank" title="Click to know more about BENDS">BENDS</a> towards right <br/>bends towards <br/>does not <a href="https://interviewquestions.tuteehub.com/tag/change-913808" style="font-weight:bold;" target="_blank" title="Click to know more about CHANGE">CHANGE</a> </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> | |
| 35521. |
Passage - II : Liquids do not have definite shape and size, they are taken in a vessel. Their expansion (or) contraction takes place with respect to the container in which they arc considered. The volume coefficient of expansion relative to the vessel is termed as coefficient of apparent expansion ( gamma_(a) ) and the volume coefficient of expansion of the liquid is termed as absolute ( gamma_(R) "or" gamma_(L ) ). In some of the arrangements mentioned as per the instructions. solve the problems. A thread of liquid in a uniform capillary tube of length L, as measured by a ruler. The temperature of the tube and the thread of the liquid is raised by 'Delta theta'. If gamma is the coefficient of volume expansion of the liquid and alpha is the coefficient of linear expansion of the material of the tube, then the increase in length 'Delta L' of the thread as measured by the ruler will be |
| Answer» <html><body><p>`Delta <a href="https://interviewquestions.tuteehub.com/tag/l-535906" style="font-weight:bold;" target="_blank" title="Click to know more about L">L</a> = L ( gamma - alpha) Delta <a href="https://interviewquestions.tuteehub.com/tag/theta-1412757" style="font-weight:bold;" target="_blank" title="Click to know more about THETA">THETA</a>`<br/>`Delta L = ( gamma - 2alpha) Delta theta`<br/>`Delta L = L ( gamma - 3 alpha) Delta theta `<br/>`Delta = L gamma ( Delta theta)`</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> | |
| 35522. |
The sum of magnitudes of two forces acting at a point is 16N. If their resultant is normal to the smaller force and has a magnitude of 8N. Then the forces are |
| 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/let-11597" style="font-weight:bold;" target="_blank" title="Click to know more about LET">LET</a> `vec(F)` be the resultant of two forces `vec(F)_(1)` and `vec(F)_(2)` as shown in figure with `F_(2) gt F_(1)`. <br/> `F_(2) sin theta = F_(1)` ….(i) <br/> `F_(2) cos theta = F = 8` …..(ii) <br/> Squaring and adding <a href="https://interviewquestions.tuteehub.com/tag/eqs-2072581" style="font-weight:bold;" target="_blank" title="Click to know more about EQS">EQS</a> (i) and (ii), we get <br/> `F_(2)^(2) = F_(1)^(2) + 64`.....(iii) <br/> Given `F_(1) + F_(2) = 16`.....(iv) <br/> SolvingEqs. (iii) and (iv), we get <br/> `F_(1) = 6N` and `F_(2) = <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/n-568463" style="font-weight:bold;" target="_blank" title="Click to know more about N">N</a>`</body></html> | |
| 35523. |
A particle is projected from the ground with an initial speed v at an angle theta with horizontal. The average velocity of the particle between its point of projection and highest point of trajectory is |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :<img src="https://doubtnut-static.s.llnwi.net/static/physics_images/AKS_DOC_OBJ_PHY_XI_V01_A_C04_SLV_056_S01.png" width="80%"/> <br/> R/2 <br/> `vecv_(avg) = (vecv+vecu)/(2) = (u <a href="https://interviewquestions.tuteehub.com/tag/cos-935872" style="font-weight:bold;" target="_blank" title="Click to know more about COS">COS</a> theta <a href="https://interviewquestions.tuteehub.com/tag/hat-1016178" style="font-weight:bold;" target="_blank" title="Click to know more about HAT">HAT</a>(i) +(u cos theta hat(i)+u sin theta hat(<a href="https://interviewquestions.tuteehub.com/tag/j-520843" style="font-weight:bold;" target="_blank" title="Click to know more about J">J</a>)))/(2)` <br/> ` v_(av) = (v)/(2)<a href="https://interviewquestions.tuteehub.com/tag/sqrt-1223129" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT">SQRT</a>(1+3cos^(2)theta)`</body></html> | |
| 35524. |
Passage - II : Liquids do not have definite shape and size, they are taken in a vessel. Their expansion (or) contraction takes place with respect to the container in which they arc considered. The volume coefficient of expansion relative to the vessel is termed as coefficient of apparent expansion ( gamma_(a) ) and the volume coefficient of expansion of the liquid is termed as absolute ( gamma_(R) "or" gamma_(L ) ). In some of the arrangements mentioned as per the instructions. solve the problems. The height of the liquid column in the cylindrical container is h_0 at 0^(@) C. If the temperature of the liquid raises to 0^(@) C, assuming the coefficient of volume expansion of liquid and solid as gamma_(L ) and gamma_(S) respectively, the height of the liquid in the vessel ( h_( theta )) as a function of temperature ( theta) is |
| Answer» <html><body><p>`h_( theta ) = h _(0) [ <a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>+ ( gamma_(L)- gamma_(s) ) theta ]`<br/>`h_( theta ) = h_(0) [ 1 + ( gamma_(L ) - (2 <a href="https://interviewquestions.tuteehub.com/tag/gamma-470142" style="font-weight:bold;" target="_blank" title="Click to know more about GAMMA">GAMMA</a> s) /( 3) ) theta ]`<br/>`h_( theta = h_(0)[ 1+( gamma_(L )- ( <a href="https://interviewquestions.tuteehub.com/tag/gammas-2666539" style="font-weight:bold;" target="_blank" title="Click to know more about GAMMAS">GAMMAS</a> ) /( 3 ) ) theta ]`<br/>`h_( theta ) = h _(0)[ 1+ gamma_( L ) - ( gammas)/( 2) ) theta ]`.</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> | |
| 35525. |
The component of a vector 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> <a href="https://interviewquestions.tuteehub.com/tag/less-1071906" style="font-weight:bold;" target="_blank" title="Click to know more about LESS">LESS</a> than its <a href="https://interviewquestions.tuteehub.com/tag/magnitude-1083080" style="font-weight:bold;" target="_blank" title="Click to know more about MAGNITUDE">MAGNITUDE</a> <br/>always <a href="https://interviewquestions.tuteehub.com/tag/greater-476627" style="font-weight:bold;" target="_blank" title="Click to know more about GREATER">GREATER</a> than its magnitude<br/>always <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 its magnitude<br/>Less than or equal to its magnitude</p>Answer :D</body></html> | |
| 35526. |
What would a person hear, if he moves away from a source of sound with the speed of sound? |
| 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> :Nothing. The <a href="https://interviewquestions.tuteehub.com/tag/relative-1183377" style="font-weight:bold;" target="_blank" title="Click to know more about RELATIVE">RELATIVE</a> velocity of sound <a href="https://interviewquestions.tuteehub.com/tag/waves-13979" style="font-weight:bold;" target="_blank" title="Click to know more about WAVES">WAVES</a> with respect to <a href="https://interviewquestions.tuteehub.com/tag/person-25481" style="font-weight:bold;" target="_blank" title="Click to know more about PERSON">PERSON</a> is zero.</body></html> | |
| 35527. |
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> | |
| 35528. |
Five vectors vecA, vecB, vecC,vecD and vecE have magnitude10, 12 sqrt(2), 20, 20 and10 unitrespectively, they aredireacted as shown in thefig. 3.58 Answer the following questions : |
| Answer» <html><body><p><br/></p>Solution : `vecA = 10hati,""<a href="https://interviewquestions.tuteehub.com/tag/vecb-3257249" style="font-weight:bold;" target="_blank" title="Click to know more about VECB">VECB</a>= 12 hati +12 hatj` <br/> `vecC = - sqrt(3) 10hati + 10 hatj" ", "" vecp= 10hati-10sqrt(3) hatj`<br/> `<a href="https://interviewquestions.tuteehub.com/tag/vecd-3257483" style="font-weight:bold;" target="_blank" title="Click to know more about VECD">VECD</a> = -10hatj` <br/> `(vecA + vecB +vecC +vecD + <a href="https://interviewquestions.tuteehub.com/tag/vece-3257491" style="font-weight:bold;" target="_blank" title="Click to know more about VECE">VECE</a>)=(11-10sqrt(3)) hati + (12-10sqrt(3))hatj` <br/> <a href="https://interviewquestions.tuteehub.com/tag/x-746616" style="font-weight:bold;" target="_blank" title="Click to know more about X">X</a> <a href="https://interviewquestions.tuteehub.com/tag/component-926634" style="font-weight:bold;" target="_blank" title="Click to know more about COMPONENT">COMPONENT</a> = `12-10sqrt(3)` <br/>y component = `12-10sqrt(3)`</body></html> | |
| 35529. |
A cyclist is riding with a speed of 27 km /h . As he approaches a circular turn on the road of radius 80 m , he applies brakes and reduces his speed at the constant rate of 0.50m//s every second . Whatis the magnitude and direction of thenet acceleration of the cyclist on the circular turn ? |
| 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> :`0.86 " m s"^(-<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a>),54.5^(@)` with <a href="https://interviewquestions.tuteehub.com/tag/thedirection-1403560" style="font-weight:bold;" target="_blank" title="Click to know more about THEDIRECTION">THEDIRECTION</a> of <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a></body></html> | |
| 35530. |
Five vectors vecA, vecB, vecC,vecD and vecE have magnitude10, 12 sqrt(2), 20, 20 and10 unitrespectively, they aredireacted as shown in thefig. 3.58 Answer the following questions : |
| Answer» <html><body><p><br/></p>Solution :`vecA = 10hati,""vecB= 12 hati +12 hatj` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/vecc-3257279" style="font-weight:bold;" target="_blank" title="Click to know more about VECC">VECC</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>(3) 10hati + 10 hatj" ", "" vecp= 10hati-10sqrt(3) hatj`<br/> `<a href="https://interviewquestions.tuteehub.com/tag/vecd-3257483" style="font-weight:bold;" target="_blank" title="Click to know more about VECD">VECD</a> = -10hatj`<br/> `(vecA + vecB +vecC ) = (22-10sqrt(3)) hati + 22hatj` <br/> x <a href="https://interviewquestions.tuteehub.com/tag/component-926634" style="font-weight:bold;" target="_blank" title="Click to know more about COMPONENT">COMPONENT</a> = `22-10sqrt(3)` <br/>y component = `22`</body></html> | |
| 35531. |
The cycle is shown in figure is made of one mole of perfect gas in a cylinder with a piston . The processes A to B and C to D are isochoric wheras process B to C and D to A are adiabatic, the work done in one cycle is (V_(A)=V_(B)=V,V_(C)=V_(D) =2V "and " gamma=5//3) |
| Answer» <html><body><p>`[1-4^(<a href="https://interviewquestions.tuteehub.com/tag/3-301577" style="font-weight:bold;" target="_blank" title="Click to know more about 3">3</a>)/(2)](P_(<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>)-P_(A))V`<br/>`(3)/(2)[1-3^(2)/(3)](P_(B)-P_(A))V`<br/>`(3)/(2)[1-2^(-2)/(3)](P_(B)-P_(A))V`<br/>`(<a href="https://interviewquestions.tuteehub.com/tag/5-319454" style="font-weight:bold;" target="_blank" title="Click to know more about 5">5</a>)/(2)[1-2^(-2)/(3)](P_(B)-P_(A))V`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :C</body></html> | |
| 35532. |
Five vectors vecA, vecB, vecC,vecD and vecE have magnitude10, 12 sqrt(2), 20, 20 and10 unitrespectively, they aredireacted as shown in thefig. 3.58 Answer the following questions : |
| Answer» <html><body><p><br/></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> :`vecA = 10hati,""vecB= 12 <a href="https://interviewquestions.tuteehub.com/tag/hati-2693493" style="font-weight:bold;" target="_blank" title="Click to know more about HATI">HATI</a> +12 <a href="https://interviewquestions.tuteehub.com/tag/hatj-2693584" style="font-weight:bold;" target="_blank" title="Click to know more about HATJ">HATJ</a>` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/vecc-3257279" style="font-weight:bold;" target="_blank" title="Click to know more about VECC">VECC</a> = - sqrt(3) 10hati + 10 hatj" ", "" vecp= 10hati-10sqrt(3) hatj`<br/> `<a href="https://interviewquestions.tuteehub.com/tag/vecd-3257483" style="font-weight:bold;" target="_blank" title="Click to know more about VECD">VECD</a> = -10hatj` <br/>`(vecA + vecC+ vecD) = - 10sqrt(3)hati + (10-10sqrt(3))hatj` <br/> x component = `-10sqrt(3)` <br/>y component = `10-10sqrt(3)`</body></html> | |
| 35533. |
An iron needle slowly placed on the surface of water floats on its because |
| Answer» <html><body><p>when inside in water it will displaced water more than its weigths<br/>the <a href="https://interviewquestions.tuteehub.com/tag/density-17451" style="font-weight:bold;" target="_blank" title="Click to know more about DENSITY">DENSITY</a> of the material of needle is <a href="https://interviewquestions.tuteehub.com/tag/less-1071906" style="font-weight:bold;" target="_blank" title="Click to know more about LESS">LESS</a> than that of water <br/>of <a href="https://interviewquestions.tuteehub.com/tag/surface-1235573" style="font-weight:bold;" target="_blank" title="Click to know more about SURFACE">SURFACE</a> tension <br/>of is shape</p>Answer :C</body></html> | |
| 35534. |
What is the differences between accuracy and precision? |
| Answer» <html><body><p></p>Solution :<a href="https://interviewquestions.tuteehub.com/tag/accuracy-847217" style="font-weight:bold;" target="_blank" title="Click to know more about ACCURACY">ACCURACY</a> means the extent to which a <a href="https://interviewquestions.tuteehub.com/tag/measured-7257656" style="font-weight:bold;" target="_blank" title="Click to know more about MEASURED">MEASURED</a> value agress with the <a href="https://interviewquestions.tuteehub.com/tag/true-713260" style="font-weight:bold;" target="_blank" title="Click to know more about TRUE">TRUE</a> value. But precision means the extent to which a given set of measurements of the same <a href="https://interviewquestions.tuteehub.com/tag/quantity-1174212" style="font-weight:bold;" target="_blank" title="Click to know more about QUANTITY">QUANTITY</a> agree with their <a href="https://interviewquestions.tuteehub.com/tag/mean-1091459" style="font-weight:bold;" target="_blank" title="Click to know more about MEAN">MEAN</a> value. Precise measurement need not be accurate.</body></html> | |
| 35535. |
A ray of light is incident is 60^@ on a prism of refracting angle 30^@. The emerging ray is at an angle 30^@ with the incident ray. The value of refractive index of the prism is: |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/sqrt3-3056952" style="font-weight:bold;" target="_blank" title="Click to know more about SQRT3">SQRT3</a>/4`<br/>`sqrt3/2`<br/>`sqrt3`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/2sqrt3-1838932" style="font-weight:bold;" target="_blank" title="Click to know more about 2SQRT3">2SQRT3</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> | |
| 35536. |
In which of the following cases the net force is not zero ? |
| Answer» <html><body><p> A kite skillfully held <a href="https://interviewquestions.tuteehub.com/tag/stationary-633001" style="font-weight:bold;" target="_blank" title="Click to know more about STATIONARY">STATIONARY</a> in the sky <br/> A ball freely falling from a height <br/> An aeroplane <a href="https://interviewquestions.tuteehub.com/tag/rising-1189698" style="font-weight:bold;" target="_blank" title="Click to know more about RISING">RISING</a> upwards at an angle of 45° with the horizontal with a <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 href="https://interviewquestions.tuteehub.com/tag/speed-1221896" style="font-weight:bold;" target="_blank" title="Click to know more about SPEED">SPEED</a> <br/> A <a href="https://interviewquestions.tuteehub.com/tag/cork-426211" style="font-weight:bold;" target="_blank" title="Click to know more about CORK">CORK</a> floating on the surface of water.</p>Answer :B</body></html> | |
| 35537. |
Internal energy, volume and mass are intensive variable while pressure, temperature and density are extensive variables. |
| 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/false-459184" style="font-weight:bold;" target="_blank" title="Click to know more about FALSE">FALSE</a></body></html> | |
| 35538. |
A body freely falling from a height h describes 7h/16 in the last second of its fall. The height h is (g=10ms^(-2)) |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/80-337972" style="font-weight:bold;" target="_blank" title="Click to know more about 80">80</a> m<br/>45 m<br/>160 m<br/>40m</p>Answer :A</body></html> | |
| 35539. |
The unit of the quantity g/G in SI will be |
| Answer» <html><body><p>`<a href="https://interviewquestions.tuteehub.com/tag/kgm-2769156" style="font-weight:bold;" target="_blank" title="Click to know more about KGM">KGM</a>^(-2)`<br/>`<a href="https://interviewquestions.tuteehub.com/tag/mkg-561989" style="font-weight:bold;" target="_blank" title="Click to know more about MKG">MKG</a>^(-2)`<br/>`m^(2) kg^(-1)`<br/>`kg^(2)m^(-1)`</p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :A</body></html> | |
| 35540. |
A man wishes to estimate the distance of a nearby tower from him. He stands at a point A in fron of the tower C and spots a very distant objct O in line with AC. He then walks pependicular to AC up to B, a distance of 100 m and look at O and C again. Since O is very distant the direction BO is practivally the same as AO, but he finds the line of slight by of C shifted fro the original line of slight by an angle theta=30^(@) (theta is known as parallax) estimate the distance of the tower C from his original position A. |
| Answer» <html><body><p></p><a href="https://interviewquestions.tuteehub.com/tag/solution-25781" style="font-weight:bold;" target="_blank" title="Click to know more about SOLUTION">SOLUTION</a> :<img src="https://doubtnut-static.s.llnwi.net/static/physics_images/KPK_AIO_PHY_XI_P1_C02_E02_002_S01.png" width="80%"/> <br/> Parallax <a href="https://interviewquestions.tuteehub.com/tag/angle-875388" style="font-weight:bold;" target="_blank" title="Click to know more about ANGLE">ANGLE</a> `theta=40^(@)` <br/> `"tan" theta=(AB)/(AC)` <br/> `:.AC=(AB)/(tan theta)` <br/> `=(<a href="https://interviewquestions.tuteehub.com/tag/100-263808" style="font-weight:bold;" target="_blank" title="Click to know more about 100">100</a>)/(tan 40^(@))` <br/> `=(100)/(0.8391)` <br/> `=119.175` <br/> `:.AC~~119 m`</body></html> | |
| 35541. |
ABC is a right angled triangular plate of uniform thickness. The sides are such that AB gt BC as shown in figure. I_(1),I_(2) and I_(3) are moments of inertia about AB,BC andAC respectively. Then, which of the following relation is correct ? |
| Answer» <html><body><p>`I_(<a href="https://interviewquestions.tuteehub.com/tag/1-256655" style="font-weight:bold;" target="_blank" title="Click to know more about 1">1</a>)=I_(2)=I_(3)`<br/>`I_(2) gt I_(1) gt I_(3)`<br/>`I_(3) <a href="https://interviewquestions.tuteehub.com/tag/lt-537906" style="font-weight:bold;" target="_blank" title="Click to know more about LT">LT</a> I_(2) lt I_(1)`<br/>`I_(2) gt I_(1) gt I_(2)`</p>Solution :For a given body, mass is same, so it will <a href="https://interviewquestions.tuteehub.com/tag/depend-948478" style="font-weight:bold;" target="_blank" title="Click to know more about DEPEND">DEPEND</a> only on the distribution of mass about the axis <br/> The mass is farthest from axis BC, so `I_(2)` is maximum. Mass is nearest to axis AC, so `I_(3)` is minimum. <br/> Hence, the <a href="https://interviewquestions.tuteehub.com/tag/correct-409949" style="font-weight:bold;" target="_blank" title="Click to know more about CORRECT">CORRECT</a> sequence will be <br/> `I_(2) gt I_(1) gt I_(3)`</body></html> | |
| 35542. |
Two closed organ pipes of length 100 cm and 101 cm produce 16 beats in 20 sec. When each pipe is sounded in its fundamental mode calculate the velocity of sound in m/s. |
| Answer» <html><body><p>303<br/>332<br/>`323.2`<br/>330</p>Solution :For first cloed pipe, <br/> `f _(1) = (v)/(4L) = (v)/( 4 xx 100) = (v)/(400)` <br/> For second closed, pipe, <br/> `f._(1) = (v)/(4L), = (v)/(4 xx <a href="https://interviewquestions.tuteehub.com/tag/101-266127" style="font-weight:bold;" target="_blank" title="Click to know more about 101">101</a>) =(v)/(404)` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/implies-1037962" style="font-weight:bold;" target="_blank" title="Click to know more about IMPLIES">IMPLIES</a> f _(1) gt f _(1)` <br/> Here, `f _(1) -f ._(1)= (16)/(<a href="https://interviewquestions.tuteehub.com/tag/20-287209" style="font-weight:bold;" target="_blank" title="Click to know more about 20">20</a>)= ("<a href="https://interviewquestions.tuteehub.com/tag/totla-3226150" style="font-weight:bold;" target="_blank" title="Click to know more about TOTLA">TOTLA</a> no. of <a href="https://interviewquestions.tuteehub.com/tag/beats-14673" style="font-weight:bold;" target="_blank" title="Click to know more about BEATS">BEATS</a>")/(total time")` <br/> `therefore (v)/(400)-(v)/(404) = (16)/(20)` <br/> `therefore v ((404 - 400)/(400 xx 404))= (16)/(20)` <br/> `therefore v = 32320 cm //s =323.2 m//s`</body></html> | |
| 35543. |
In an experiment to measure density of a cube percentage error in measurement of mass and length of sphere is 0.26% and 0.38% respectively, then find % error in measurement of density. |
| Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/14-272882" style="font-weight:bold;" target="_blank" title="Click to know more about 14">14</a>%<br/>1.40%<br/>1.04%<br/>1.44%</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> :Density of cube `rho=(M)/(<a href="https://interviewquestions.tuteehub.com/tag/v-722631" style="font-weight:bold;" target="_blank" title="Click to know more about V">V</a>)=(M)/(<a href="https://interviewquestions.tuteehub.com/tag/l-535906" style="font-weight:bold;" target="_blank" title="Click to know more about L">L</a>^(3))` <br/> <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 cube `=l^(3)` <br/> `:.` % error in measurement of density, <br/> `(Deltarho)/(rho)xx100=(DeltaM)/(M)xx100+3(Deltal)/(l)xx100` <br/> `:.(Deltarho)/(rho)xx100=0.26+3xx0.38` <br/> `=0.26+1.14=1.40%`</body></html> | |
| 35544. |
A force vecF = alpha hati + 3hatj + 6hatk is acting at a point vecr = 2hati - 6hatj - 12hatk . The value of alpha for which angular momentum about origin is conserved is |
| Answer» <html><body><p>zero <br/>1<br/>`-1`<br/>2</p>Solution :For the conservation of angular <a href="https://interviewquestions.tuteehub.com/tag/momentum-1100588" style="font-weight:bold;" target="_blank" title="Click to know more about MOMENTUM">MOMENTUM</a> about origin , the <a href="https://interviewquestions.tuteehub.com/tag/torque-1422441" style="font-weight:bold;" target="_blank" title="Click to know more about TORQUE">TORQUE</a> `vectau` <a href="https://interviewquestions.tuteehub.com/tag/acting-269" style="font-weight:bold;" target="_blank" title="Click to know more about ACTING">ACTING</a> on 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 be zero <br/> By definition, `vectau = vecrxx vecF`<br/> Here `vecr = 2hati- 6hatj - 12 hatk` and `vecF = alpha hati + 3hatj + 6hatk` <br/> `therefore vectau = |{:(hati , <a href="https://interviewquestions.tuteehub.com/tag/hatj-2693584" style="font-weight:bold;" target="_blank" title="Click to know more about HATJ">HATJ</a> , hatk) , (2 , -6 , -12) , (alpha , 3 , 6):}|` <br/> `= hati (-36 + 36) - hatj (12 + 12 alpha) + hatk (6 + 6 alpha)` <br/> `=- hatj (12 + 12 alpha) + hatk (6 + 6 alpha)` <br/> But `vectau = 0` <br/> `therefore 12 + 12 alpha = 0 or alpha = -1` and `6 + 6 alpha = 0` and `alpha = -1`</body></html> | |
| 35545. |
For an ideal gas the molar heat capacity varies as C = C_v +3a T^2.Find the equation of the process inthe variables (T,V) where a is a constant. |
| 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> :`Ve^(-((<a href="https://interviewquestions.tuteehub.com/tag/3a-310574" style="font-weight:bold;" target="_blank" title="Click to know more about 3A">3A</a>)/(<a href="https://interviewquestions.tuteehub.com/tag/2r-300472" style="font-weight:bold;" target="_blank" title="Click to know more about 2R">2R</a>) )T^2)`= <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a></body></html> | |
| 35546. |
(A) When a ball hits a wall (stationary) it returns back with the same velocity, if collision is elastic. (B) A ball hits a bus moving towards it. If the collision is inelastic, they move together. (C ) Inelastic collision arises due to loss in K.E during collision |
| Answer» <html><body><p>A,<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a> are true<br/>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> are false<br/>A,B, C are true<br/>A,B, C are false</p>Answer :C</body></html> | |
| 35547. |
If the sum of two unit vectors is also a unit vector. Find the magnitude of their difference? |
| Answer» <html><body><p></p>Solution :Let`<a href="https://interviewquestions.tuteehub.com/tag/hata-2693428" style="font-weight:bold;" target="_blank" title="Click to know more about HATA">HATA</a> "and" <a href="https://interviewquestions.tuteehub.com/tag/hatb-2693435" style="font-weight:bold;" target="_blank" title="Click to know more about HATB">HATB</a>` are the given <a href="https://interviewquestions.tuteehub.com/tag/unit-1438166" style="font-weight:bold;" target="_blank" title="Click to know more about UNIT">UNIT</a> vectors and `hatR` is their <a href="https://interviewquestions.tuteehub.com/tag/resultant-1187362" style="font-weight:bold;" target="_blank" title="Click to know more about RESULTANT">RESULTANT</a> then `|hatR|=|hatA+hatB|`<br/> `1=sqrt((hatA)^(2)+(hatB)^(2)+2|hatA||hatB| <a href="https://interviewquestions.tuteehub.com/tag/cos-935872" style="font-weight:bold;" target="_blank" title="Click to know more about COS">COS</a> theta), 1=1 +1+2 cos theta rArr cos theta =-1/2`<br/>`|vecA-vecB|=sqrt((hatA)^(2)+(hatB)^(2)-2|hatA||hatB|cos theta)=sqrt(1+1-2xx1xx1(-1/2))=sqrt3`</body></html> | |
| 35548. |
Circular disc of mass 2 kg and radius 1 metre is rotating about an axis perpendicular to its plane and passing through its centre of mass with a rotational kinetic energy of 8Joules. The angular momentum in(J-sec) is |
| Answer» <html><body><p>8<br/>4<br/>2<br/>1</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> | |
| 35549. |
(i) For the wave on a string described in Exercise 15.11. do all the points on the string oscillate with the same (a) frequency , (b) phase , (c ) amplitude? Explain your answers. (ii) What is the amplitude of a point 0.375 m away from one end? |
| Answer» <html><body><p></p>Solution :Here given stationary wave is <br/> `y = 0.06 <a href="https://interviewquestions.tuteehub.com/tag/sin-1208945" style="font-weight:bold;" target="_blank" title="Click to know more about SIN">SIN</a> ((2pi)/(3)x) cos (120 pi t ) ""…(1)` <br/> Comparing above equation with, <br/> `y = 2a sin (kx) cos (omegat)""…(2)` <br/> we get ,` omega 2pi f = 120 pi impliesf = 60 Hz` which is same for all the particles of a string. <br/> In case of stationary wave, <a href="https://interviewquestions.tuteehub.com/tag/phases-1152932" style="font-weight:bold;" target="_blank" title="Click to know more about PHASES">PHASES</a> of oscillation for particles in any given loop are same because they oscillate simulataneously <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 string. (In other words, phase differentce between any two particles in any oop is <a href="https://interviewquestions.tuteehub.com/tag/zero-751093" style="font-weight:bold;" target="_blank" title="Click to know more about ZERO">ZERO</a>). In case of stationary wave <a href="https://interviewquestions.tuteehub.com/tag/amplitudes-859603" style="font-weight:bold;" target="_blank" title="Click to know more about AMPLITUDES">AMPLITUDES</a> of all the particles in a given string are not same because amplitude of oscillation of a given particle at distnace x from one end of string is, <br/>`A =2a sin (kx)` <br/> `implies` Amplitude of oscillation of a particle depends on its position. <br/> Here,` A = 3 a sin (kx)` <br/> `= 0.06 sin ((2pi)/(3) xx 0.375) = 0.067 sin (0.25pi)` <br/> `=0.06 sin ((pi)/(4))` <br/> `=0.06 xx 0.7071` <br/> `therefore A = 0.04343 m`</body></html> | |
| 35550. |
Velocity-time equation of a particle moving in a straight line is v=2t-4 for t le 2s and v= 4-2t for 1 gt 2s. The distance travelled ( in meters) by the particle in the time interval from t=0 to t=4s is 4k. The value of 'k' is ( Here t is in second and v in m/s) : |
| Answer» <html><body><p> <br/></p><a href="https://interviewquestions.tuteehub.com/tag/answer-15557" style="font-weight:bold;" target="_blank" title="Click to know more about ANSWER">ANSWER</a> :<a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a></body></html> | |