InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Define : (a) Osmosis (b) Freezing point |
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Answer» (a) Osmosis : A process by which molecules of a solvent tend to pass through a semi-permeable memebrane concentrated one. When the membrane permits the solvent molecules to come out through the membrane, it is called exosmosis. When the membrane permits the solvent molecules to enter inside, it is called endosmosis. The minimum excess pressure that has to be applied on the solution to prevent the entry of the solvent into the solution through the semi-permeable membrane is called the osmotic pressure. (b) Freezing point : Freezing point of a substance is the temperature at which the solid and liquid forms of a substance are in equilibrium i.e., solid and liquid form of a substance have same vapour pressure Freezing point of the solution is always lower than that of pure solvent. the decrease in freezing point is known as depression in freezing point. |
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| 52. |
Which among the following reaction is an example of a zero order reaction?A. `H_(2(g)) + I_(2(g)) to 2 HI_((g))`B. `2H_(2)O_(2(l)) to 2H_(2) O_((l)) + O_(2(g))`C. `C_(12) H_(22) O_(11(aq)) + H_(2) O_((l)) to C_(6) H_(12) O_(6(aq)) + C_(6) H_(12) O_(6(aq))`D. `2NH_(3(g)) overset(Pt)(to) n_(2(g)) + 3H_(2(g))` |
| Answer» `2NH_(3(g)) overset(Pt)(to) N_(2(g)) + 3H_(2(g))` | |
| 53. |
Potential of saturated colomel electrode isA. 0.242 VB. 1.1 VC. 0.337 VD. 0.28 V |
| Answer» Correct Answer - 0.242 V | |
| 54. |
which of the following compounds is used as a semipermeable membrane?A. Potassium ferrocyanideB. potassium argentocyanideC. Sodium meta aluinateD. Copper ferrocyanide |
| Answer» Correct Answer - copper ferrocyanide | |
| 55. |
which among the following minerals does not contain aluminium?A. CryoliteB. SideriteC. China clayD. Corundum |
| Answer» Correct Answer - Siderite | |
| 56. |
The group 15 element having inner electronic configuration as of argon isA. Phosphorous (z = 15)B. Antimony (z = 51)C. Arsenic (z = 33)D. Nitogen (z = 37) |
| Answer» Phosphorous (Z = 15) | |
| 57. |
Write chemical reactions involved in Van Arkel method for refining Titanium. |
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Answer» The steps of the reaction involved in van Arkel method are: Crude metal is heated the metal iodine in an evacuated vessel to separate the metal from impurities `Ti + 2I_(2) to TiI_(4)` `TiI_(4)` decomposes at 1800 K to both give pure Ti metal and iodine. `TiI_(4) to Ti + 2I_(2)` |
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| 58. |
Explain any two chemical methods of food preservation. |
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Answer» Chemical methods : Chemically presevation can be done by adding sugar, salt or vinegar in food Chemicals like sodium benoate, salts or sorbic acid and propionic acid etc. are used as preservatives. (a) Preservation by addition of sugar and then applying heat is highly important method in case of fruits to prepare jams, jellies and marmalades, This method is simple, cheap and easy to adopt. (b) Salting is also used to control the growth of fungus or micro-organisums in food storing. It is mainly used in preparation of pickles of raw mango, lemon, chillies, etc., and to preserve fish products. The anti-microbial activity of common salt is due to osmosis, a cell loses water, dies or remains dormant. It is an oldest method to preserve food. |
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| 59. |
Insects and birds birds began to heave the tree And then they came to its massive trunk Fifty men with axes chopped and chopped The catched in terror and fascination this slaughter As a raw mythology revealed to us its age What , according to you , did insects and birds begin to leave the banyan tree ? |
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Answer» The insects and birds begen to leave the banyan tree because its branches were being cut . |
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| 60. |
Read the following extract and answer the questions given below : I celebrate the virtues and vices of suburban middle-class people who overwhelm the refrigerator and position colourful umbrellas near the garden that longs for a pool for my middle-class brother this principle of suprime luxuary : what are you and what am I, and we go on deciding the real truth in this would . This poem does not follow any fix-verse pattern rtyme scheme). What type of peom is it ? |
| Answer» It is a blank verse . | |
| 61. |
Read the following extract and answer the questions given below : I celebrate the virtues and vices of suburban middle-class people who overwhelm the refrigerator and position colourful umbrellas near the garden that longs for a pool for my middle-class brother this principle of suprime luxuary : what are you and what am I, and we go on deciding the real truth in this would . Given a list of the objects of laxury as given iin the extract . |
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Answer» Objects of luxury are the refrigerator , colourful umbrells and garden with a long pool . |
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| 62. |
Read the following extract and answer the questions given below : I celebrate the virtues and vices of suburban middle-class people who overwhelm the refrigerator and position colourful umbrellas near the garden that longs for a pool for my middle-class brother this principle of suprime luxuary : what are you and what am I, and we go on deciding the real truth in this would . What is your idea about a luxurious life ? |
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Answer» My idea about a luxurious life is to be content with what I have as generalyy, we are not satisfied with what we have . Moreover , we should understend both virtues and vices of life . |
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| 63. |
Find out the words from the extract which mean : involving a lot of effect which mean : |
| Answer» Correct Answer - arduous | |
| 64. |
Find out the words from the extract which mean : serious requests |
| Answer» Correct Answer - entreaties | |
| 65. |
Read the following extract and answer the questions given below : I asked her why She was so sad ? She told me her baby was killed in Auschwitz , her daughter in Hiroshima and her sons in Vietnam , Ireland , Israle , Palestine , Lebanon , Bosnia , Rwanda, Kosova and Chechnya ... Why was the women in the extract sad ? |
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Answer» The women in the extract was sad because her childern were brutally killed in different parts of the would that are mentioned in the stanza. |
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| 66. |
Read the following extract and answer the questions given below : I asked her why She was so sad ? She told me her baby was killed in Auschwitz , her daughter in Hiroshima and her sons in Vietnam , Ireland , Israle , Palestine , Lebanon , Bosnia , Rwanda, Kosova and Chechnya ... What purpose does the dialogue form serve in the extract ? |
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Answer» The dialogue in the poem gives us sympathetic effect . It shows how the women is worried about the children dying in different parts of the would whom she refers hare . They are dying due to war . |
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| 67. |
Read the following extract and answer the questions given below : I asked her why She was so sad ? She told me her baby was killed in Auschwitz , her daughter in Hiroshima and her sons in Vietnam , Ireland , Israle , Palestine , Lebanon , Bosnia , Rwanda, Kosova and Chechnya ... What do you think , are the dire consequences of a war |
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Answer» War is always destructive . It takes the lives of thousand of innocent people . For e.g., Nuclear explosion in Hiroshima . It alos leads to the destruction of property and the after effects continue to further generations. |
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| 68. |
Select and write the correct answer from the given alternatives in each of the following sub-questions : `int_(4)^(9) (1)/(sqrt(x))dx=.......`A. 1B. -2C. 2D. -1 |
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Answer» Correct Answer - C Let `I=underset(4)overset(9)int (x)^(-1//2)dx` `=[(x^(1//2))/(1//2)]_(4)^(9)` `=(2x^(1//2))_(4)^(9)` `=2(sqrt(9)-sqrt(4))=2(3-2)=2` Hence, correct answer from the given alternatives is (c). |
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| 69. |
`sec sqrt(x)` |
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Answer» Given, `y=sec sqrt(x)` On differentiating w.r.t. x, `(dy)/(dx)=(d)/(dx) (sec sqrt(x))` `=sec sqrt(x)* tan sqrt(x)* (d)/(dx)(sqrt(x))` `(dy)/(dx)=sec sqrt(x)* tan sqrt(x) * (1)/(2sqrt(x))` |
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| 70. |
If `A=[(2,-3),(3,5)]` then find `A^(-1)` by adjoint method. |
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Answer» Given, `A=[(2,-3),(3,5)]` `|A|=2xx5-(-3)(3)=10+9=19!=0` `:.A^(-1)` exists. To find adjoint of A : `M_(11)=5, A_(11)=(-1)^(2)*5=5` `M_(12)=3, A_(12)=(-1)^(3)*3=-3` `M_(21)=-3, A_(21)=(-1)^(3)*(-3)=3` `M_(22)=2, A_(22)=(-1)^(4)*(2)=2` `:.` Matrix of cofactors is `[(5,-3),(3,2)]` `:.` Adj. `A=[(5,3),(-3,2)]` We have, `A^(-1)=(1)/(|A|)*`Adj. `A=(1)/(19)[(5,3)/(-3,2)]` |
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| 71. |
Find the principal value of `sin^(-1)``(1/(sqrt(2)))` |
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Answer» The principal value branch of `sin^(-1)x ` is `[(-pi)/(2),(pi)/(2)]`. Let `sin^(-1)(1/sqrt(2))=x` where`(-pi)/(2) le x le (pi)/(2)` `:.sinx=(1)/(sqrt(2))=sin.(pi)/(4)` `:.x=(pi)/(4) ` [ also `(-pi)/(2) le (pi)/(4) le (pi)/(2)` ] `:.` The principle value of `sin^(-1)(1/sqrt(2))` is `(pi)/(4)`. |
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| 72. |
By method, show that the quadrilateral with vertices A(1,2,-1), B(8,-3,-4), C(5,-1,1),D(-2,1,4) is a parallelogram. |
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Answer» Let `bar(a)=i+2hat(j)-k, bar(b)=8i-3j-4k,` `bar(c)=5i-4j+k, d=-2i+j+4k`, Let `bar(e)=(bar(a)+bar(c))/(2)=3i-j` ...(1) Let `bar(f)=(bar(b)+d)/(2)=3i-j` ...(2) From equation (1) and (2), we get `bar(e)=bar(f)` This shows that the point `E(bar(e))` is the midpoint of diagonals AC and BD . Therefore, diagonals AC and BD bisect each other at the point E(e). `:.` The quadrilateral ABCD is a parallelogram. Hence Proved. |
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| 73. |
A stone of mass 2kg whirled in a horizontal circle attached at the end of 1.5 m long string. If the string makes an angle of ` 30 ^@ ` with vertical, compute its period ` ( g = 9.8 m//s ^ 2 ) ` . |
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Answer» Given : Length of string (l) = 1.5 m, ` theta = 30 ^@, g = 9.8 m//s ^ 2 ` Mass of stone (m) = 2kg Period (T) ` = 2pi sqrt ( ( lcos theta ) /( g ) ) ` ` = 2 xx 3.142 sqrt ( ( 1.5 xx 1.732 ) /( 2xx 9.8 ) ) ` ` = 2 xx 3.142 sqrt ( 0.1325 ) ` ` = 2 xx 3.142 xx 0.3641 ` ` = 2.2874 ` s |
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| 74. |
Explain the formatin of stationary wave by analytical method. Show that nodes and antinodes are equally spaced in a stationary wave. The speed limit for a vehicle on road is 120 km/hr. A policeman detects a drop of 10 % in the pitch of horn of a car as it passes him. Is the policeman justified in punishing the car driver for crossing the speed limit ? ( Given : Velocity of sound = 340 m/s ) |
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Answer» conditions for antinodes : when ` A = pm 2 a ` , the particles are these points vibrate with maximum amplitude which are called antinodes. We have ` A = 2a cos "" ( 2pi x ) / ( lamda) ` ` therefore pm 2 a = 2a cos "" ( 2 pi x ) /( lamda ) ` ` therefore cos "" ( 2pi x ) /( lamda) = pm 1 ` ` therefore ( 2pi x ) /( lamda ) = 0, pi, 2pi,...... ` ` therefore x = ( lamda p) /( 2 ) = p(( lamda ) /( 2 )) ` where p = 0, 1, 2 ............. For x = 0 , ` ( lamda) /( 2 ) , lamda , ( 3lamda) /( 2 ) `.... antinodes are prouduced. The distance between any two successive antinodes is ` ( lamda ) / ( 2 ) ` Condition for nodes : When A = 0 the particles at these points are permanently at rest which are called nodes. We have, ` A = 2a cos "" ( 2pi x ) / ( x ) ` ` 2a cos (( 2pi x ) /( lamda ) ) = 0 ` ` therefore cos (( 2pi x ) /( lamda ) ) = 0 ` `( 2 pi x ) /( lamda ) = (pi) / ( 2 ), ( 3pi ) /( 2 ), ( 5pi ) /(2) `.... ` x = ( 2P - 1 ) ( lamda)/( 4 ) ` Where P = 1, 2 , ............ For ` x = ( lamda ) /( 4 ) , ( 3lamda ) / ( 4 ), ( 5lamda ) / ( 4 ) .... ` nodes are produced The distance between any two successive nodes is ` ( lamda ) /( 2 ) ` The distance between any two adjacent antinode is ` ( lamda ) /( 4 ) `. Hence, in stationary waves, the nodes and antinodes are equispaced. Numerical : Given : ` " " n_ 2 = n _ 1 - 10 % n _ 1 , v= 340 m//s ` `" " n _ 2 = n _ 1 - ( 1)/( 10) n _ 1 = ( 9 ) /( 10 ) n _ 1 ` When the car approaches the policeman, apparent fequency is ` n _ 1 = ( v + v _ 0 ) /( v - v _s ) xx n " " `... (i) where ` v _ 0 = 0 ` and when the car passes the policeman apparent fequency is ` n _ 2 = ( v - v _ 0 )/( v + v _ s ) xx n " " ` ... (ii) where, ` v _ 0 = 0 ` and `v _ s ` is the speed of car. On dividing equation (i) by (ii) ` therefore " " ( n_ 1 ) /( n _ 2 ) = ( v + v _ s ) /( v - v _ s ) ` ` therefore ( n _ 1 )/((9 ) / ( 10 ) n _ 1 ) = ( 340 + v _ s ) /( 340 - v _ s ) ` ` therefore ( 10 )/( 9 ) = ( 340 + v _ s ) /( 340 - v _ s ) ` ` v _ s = 17.89 ` m/s ` = 64.42 km//hr ` ( speed of car ) The speed limit is 120 km/hr whereas the speed of car is 64.42 km/hr. Hence the policeman is not justified in his action. |
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| 75. |
Define practical simple pendulum. Show that motion of bob of pendulum with small amplitude is linear S.H.M. Hence obtain an expression for its period. What are the factors on which its period depends ? The total free surface energy of a liquid drop is ` pi sqrt 2 ` times the surface tensin of the liquid. Calculate the diameter of the drop in S.I unit. |
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Answer» Factors on which its period depends are : (a) Period of simple pendulum is directly proportional to the square root of its length i.e., ` " " T prop sqrt L ` ( b ) Period of simple pendulum is inversely proportional to the square root of acceleration due to gravity. i.e., ` T prop ( 1 ) /( sqrt g ) ` Numerical : Given : ` " "E = pi sqrt 2 T ` ` E = T Delta A ` ` E = 4pi r ^ 2 T" " [ because Delta A = 4pi r ^ 2 ] ` ` pi sqrt 2 T = 4pi r ^ 2 T ` ` 2 sqrt 2 r^ 2 = 1 ` ` therefore " " r ^ 2 = ( 1 ) /( 2 sqrt 2 ) ` ` rArr r = (( 1 )/ ( 2 sqrt 2 ))^ ( 1//2) = 0.5946 ` ` therefore ` Diametre , ` d = 2 r ` ` = 2 xx 0.5946 ` ` = 1.1893 m ` |
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