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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.
| 23001. |
World Environment day is celebrated on:(a) 5th June(b) 20th December(c) 15th March(d) 7th July |
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Answer» Answer (a) 5th June |
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| 23002. |
Fertilization outside the body is called:(a) In vitro(b) In vivo(c) Both(d) None |
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Answer» Answer (a) In vitro |
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| 23003. |
Fertilization outside the body in almost similar conditions as that in the body is called as- (a) Natural fertilization (b) In vitro fertilization (c) Both (a) and (b) (d) Fertilization not possible |
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Answer» Fertilization outside the body in almost similar conditions as that in the body is called as In vitro fertilization. |
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| 23004. |
Intentional or voluntary termination of pregnancy before full term is called- (a) Medical termination of pregnancy (MTP) (b) Sterilisation (c) Contraception (d) Tubectomy |
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Answer» Intentional or voluntary termination of pregnancy before full term is called Medical termination of pregnancy (MTP). |
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| 23005. |
Where is 'Danchand Chopra's Havelli Situated in Rajasthan?1. Bikaner2. Sujangarh3. Khatdi4. Kishangarh |
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Answer» Correct Answer - Option 2 : Sujangarh The correct answer is Sujangarh.
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| 23006. |
Who gave Brahmanic theory of caste system ? (a) Nesfield(b) Blunt (c) G.S. Ghurye(d) None of these |
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Answer» (d) None of these |
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| 23007. |
Clothes of ………………… colours absorb heat better than clothes of ………….colours. A. Light, dark B. dark, light C. soft, dark, D. none of the above |
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Answer» Clothes of dark colours absorb heat better than clothes of light colours. |
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| 23008. |
No medium is required for transfer of heat by the process of : A. absorption B. Conduction C. Radiation D. Convection |
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Answer» C. Radiation |
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| 23009. |
How did people belonging to different communities, regions or language groups develop a sense of collective belonging in the nineteenth century India? Explain. |
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Answer» (i) The identity of the nation is most often symbolised with the image of Bharat Mata. (ii) Bankim Chandra Chattopadhyay wrote ‘Vande Mataram’ as a hymn to the motherland. (iii) Novel Anandamath. (iv) Moved by the Swadeshi movement, Abindranath Tagore painted Bharat Mata and portrayed as an ascetic figure; she is calm, composed, divine and spiritual. (v) Ideas of nationalism also developed through a movement to revive Indian folklore. (vi) Icons and symbols in unifying people and inspiring in them a feeling of nationalism. (vii) During the Swadeshi movement in Bengal, a tricolour flag (red, green and yellow) was designed. (viii) Reinterpretation of history that to instill a sense of pride in the nation. |
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| 23010. |
Describe the role of mass communication in India. |
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Answer» (i) Mass communication provides entertainment. (ii) Creates awareness among people about various national programmes and policies. It includes radio, television, newspapers, magazines, books and films. (iii) All India Radio (Akashwani) broadcasts a variety of programmes in national, regional and local languages (iv) Doordarshan broadcasts programmes of entertainment, educational, sports, etc. for people of different age groups. (v) India publishes a large number of newspapers and periodicals annually (vi) Newspapers are published in about 100 languages and dialects to create awareness among people in different parts of the country. (vii)India produces short films; video feature films and video short films. (viii) Mass media creates awareness among people on various socio-economic and political issues. (ix) Any other relevant point |
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| 23011. |
Explain the meaning and notion of ‘Swaraj’ as perceived by the plantation workers. How did they respond to the call of ‘the Non – Cooperation movement’? |
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Answer» 1. For plantation workers in Assam, Swaraj meant the right to move freely in and out of the confined space in which they were enclosed, and it meant retaining a link with the village from which they had come. 2.(i) Under the Inland Emigration Act of 1859, plantation workers were not permitted to leave the tea gardens without permission, and in fact they were rarely given such permission. 2.(ii). When they heard of the Non-Cooperation Movement, thousands of workers defied the authorities, left the plantations, and headed home. 2.(iii). They believed that Gandhi Raj was coming, and everyone would be given land in their own villages. 2.(iv). They, however, never reached their destination. Stranded on the way by a railway and steamer strike, they were caught by the police and brutally beaten up. |
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| 23012. |
Dark coloured clothes are preferred during:A. à winter B. à day C. à night D. à summer |
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Answer» A. à winter |
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| 23013. |
A word which means ‘between countries’ and is often used in an Airport name. |
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Answer» Correct option is international |
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| 23014. |
What is liquid paper?A. Paper that does not get wetB. Paper that turns into liquidC. Quick drying paper colored fluid that is applied to correct the printed material.D. Paper that never dries1. A2. D3. C4. B |
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Answer» Correct Answer - Option 3 : C The correct answer is Quick-drying paper colored fluid that is applied to correct the printed material.
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| 23015. |
A little word which means the opposite of out is ______ |
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Answer» Correct option is in |
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| 23016. |
Read the following passage and answer the questions set on it.One of the greatest runners of this century, Murray Halberg, winner of the 5000-metre race at the Rome Olympic Games in 1960, was almost killed in an accident while playing football. He was only 16 then. His left arm was so badly damaged that the arm remained paralysed for the rest of his life.Halberg was born in New Zealand. After his accident, he gave up football and took to athletics. In 1951 Arthur Lydiard became his coach. In 1956, Olympics were to be held in Melbourne in Australia and Halberg prepared seriously for the 1500-meter race. But he finished eleventh out of 12 runners. He was completely disappointed. In the end, he decided that he would make another attempt. Now 23, Halberg changed himself from a human being into a running machine.1960 came and Lydiard took him to Rome for the Olympics. Halberg was now 27, the age at which Lydiard had said he would reach his peak as a runner. He reached the final of the 5000-meter race without much effort. As the final began, all the runners were ready. The 60,000 people in the stadium never took notice of him; he was far behind them.Eight laps later, he began to overtake the other runners one by one. There were three laps for the end of the race, but Halberg was sprinting with unbelievable strength. The people wondered, “Doesn’t he know how many laps are left?” With two laps left, Halberg had a clear 18-metre lead. One lap to go with Halberg still in the lead. But he was clearly becoming weak. His head was rolling from side to side and his teeth were bared in pain. Hans Grodotski, a German, was catching up with Halberg. Now Halberg was not fighting the others, but only against himself. His body was crying out for rest. His body said that Grodotski or anyone else could have the race. But his mind did not allow the body to win.He could now see the White tape at the finishing line. Halberg prepared himself for the least effort, in case Grodotski overtook him. But Grodotski never did. Halberg fell into the tape and rolled to the ground. Halberg’s friends gathered around the fallen body. Their minds were full of anxiety. But there was that faint smile on his face.Answer the following in a word, a phrase or a sentence each: 1. Who won the 5000 metre race in the Olympic Games in 1960?2. Halberg’s arm was injured in ..........(a) a car accident(b) a football game(c) the 5000 meter race.3. Which country did Halberg belong to?4. Who was Halberg’s coach?5. How old was Halberg when he went to the 1960 Olympics?6. In which lap of the race did Halberg establish a clear lead?7. Who was catching up with Halberg?8. Halberg’s _______ did not allow his body to win. (Fill in the blank)9. Add a prefix to the word ‘complete’ to make its antonym.10. Halberg was sprinting with unbelievable _______. (strong / strength) |
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Answer» 1. Murray Halberg won the 5000 metre race in the Olympic Games in 1960. 2. (b) a football game. 3. Halberg belonged to New Zealand. 4. Arthur Lydiard was Halberg’s coach. 5. Halberg was only 16 when he went to the 1960 Olympics. 6. Eight laps later, in the ninth lap Halberg established a clear lead. 7. Hans Grodotski, a German, was catching up with Halberg. 8. mind. 9. incomplete. 10. strength. |
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| 23017. |
‘True gentlemen are made of character, not by their appearance’. Explain with reference to ‘Two Gentlemen of Verona’. |
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Answer» This short story by A.J. Cronin presents before us the story of two Veronese adolescents Nicola, aged about thirteen, and Jacopo, aged about twelve. The title ‘Two Gentlemen of Verona’ has been used by the author only to redefine the meaning of the word ‘gentlemen’ and to express his admiration for two Veronese young men who are waging a relentless and epic battle to save their elder sister Lucia, aged about twenty years. She is their only relative left in their world. Lucia is suffering from tuberculosis of the spine. She has no one el to take care of her except her two younger brothers — Nicola and Jacopo. She would have undoubtedly succumbed to her fatal disease if her two young brothers had not admitted her in a hospital and given her timely medical attention and care. Since the treatment she got in the hospital was quite expensive, and they had to make payments every week, the two young men had to work day and night to earn enough money to meet the expenses. The brothers shined shoes, sold fruits, hawked newspapers, conducted tourists round the town, ran errands, and worked hard day and night relentlessly to earn enough money for making weekly payments to the hospital. Though, the two boys, this way earned quite a lot of money, they lived a selfless and Spartan life so as to save enough for their sister’s treatment. They did not spend anything for themselves either on their food or on clothes. Thus, they saved a great deal, made regular payments to the hospital without complaining and helped their sister recuperate from her illness. The word ‘gentlemen’, during Shakespeare’s time, meant ‘a man of wealth and social position, especially one who does not work for a living’. But in the context of this lesson ‘gentleman’ means a man who is polite and shows consideration for the feelings of other people. It is true that “True gentlemen are made of character, not by their appearance”. It is in this sense that the author calls Nicola and Jacopo ‘gentlemen’ of Verona. Hence, we can say that the story of Nicola and Jacopo in ‘Two Gentlemen of Verona’, redefines the qualities of a gentleman. |
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| 23018. |
What story does the nurse narrate about Nicola and Jacopo? |
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Answer» In the short story 'Two Gentlemen of Verona' by A.J. Cronin, the nurse told the narrator that Nicola and Jacopo came from a well-off family. |
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| 23019. |
The `K_(a)` of monobasic acid `P, Q` and R are `10^(-6),10^(-8)` and `10^(-10)` respectively. The concentrations of P, Q and R are respectively 0.1M, 0.01 M and 0.001 M . Q. Which of the following is true?A. P is weakest acidB. Q is strongest acidC. R is weakest acidD. R is strongest acid |
| Answer» Correct Answer - C | |
| 23020. |
In which of the following reactions correct major product has be mentioned?A. B. C. D. |
| Answer» Correct Answer - A::C::D | |
| 23021. |
The CORRECT statement (s) is/are:A. In metallurgy of iron, flux is a substance used to convert infusible impurities to fusible mass.B. Cryolite is `Na_(3)AIF_(6)` and is used in the electrolysis of alumina for lowering the melting point of alumina.C. Combination of FeO with `SiO_(2)` must be avoided in metallurgy of copper.D. Lead can be extracted by self reduction of gelena. |
| Answer» Correct Answer - A::B::D | |
| 23022. |
The amount of an ion discharged during electrolysis is directly proportional to :A. resistance timeB. current strengthC. electrochemical equivalent of the element.D. |
| Answer» Correct Answer - B::C::D | |
| 23023. |
Which is (are) correct out of the following:A. `CH_(2)=CH_(2)ltH-C-=C-h` (rate of electrophilic addition)B. `ltH_(3)C-C-=C-CH_(3)` (rate of catalytic hydrogenation)C. (rate of electrphilic substitution reaction)D. (order of acidic strength) |
| Answer» Correct Answer - B::C::D | |
| 23024. |
A current `I = 10 sin (100pi t)` amp. Is passed in first coil, which induces a maximum e.m.f of `5pi` volt in second coil. The mutual inductance between the coils is-A. 10 mHB. 15 mHC. 25 mHD. 5 mH |
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Answer» Correct Answer - D Let `I = I_(0) sin omegat`, where `I_(0) = 10, omega = 100 pi` then `epsilon = M(dl)/(dt)` `= M(d)/(dt) I_(0) sin omegat` `= M I_(0)omega cos omegat` `therefore epsilon_("max") = MI_(0)omega` `5pi = M xx 10 xx 100pi` `M = 5mH` |
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| 23025. |
The relative permeability is represented by `mu_(r)` and susceptibility is denoted by `chi` for a magnetic substance then for a paramagnetic substance.A. `mu_(r) gt 1, chi lt 0`B. `mu_(r) gt 1, chi gt 0`C. `mu_(r) lt 1, chi lt 0`D. `mu_(r) lt 1, chi gt 0` |
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Answer» Correct Answer - B `2 gt mu_(r) gt 1, 1 gt chi_(m) gt 0` |
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| 23026. |
At the rate of 10% at what time Rs. 500 becomes double?1. 10 years2. 11 years3. 8 years4. 9 years |
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Answer» Correct Answer - Option 1 : 10 years Given: Rate = 10% Principal = Rs. 500 SI = Rs. 500 (∵ principal become doubled) Formula used: SI = (P × R × T)/100 Calculation: According to the question ⇒ SI = (P × R × T)/100 ⇒ 500 = (500 × 10 × T)/100 ⇒ 500 = 50T ⇒ 10 years = T ∴ Required time is 10 years |
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| 23027. |
by scooping out a hemisphere from each end of a solid cylinder.The length of the cylinder is 20cm and radius of the base is 3.5 cm. Find the total surface area of the article.1. 945 cm22. 549 cm23. 594 cm24. 459 cm2 |
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Answer» Correct Answer - Option 3 : 594 cm2 Given: The height of the cylinder = 20 cm Radius = 3.5 cm Formula used: Total surface area of cylinder = 2πrh Surface area of hemisphere = 2πr2 Calculation: According to the question Total surface area of cylinder = curved surface area of cylinder + 2(surface area of hemisphere) ⇒ 2πrh + 2(2πr2) ⇒ 2πr(h + 2r) ⇒ 2 × 22/7 × 3.5(20 + 2 × 3.5) cm2 ⇒ 2 × 22/7 × 3.5 × (20 + 7) cm2 ⇒ 2 × 22/7 × 3.5 × 27 cm2 ⇒ 594 cm2 ∴ The total surface area of the article is 594 cm2 |
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| 23028. |
For which values of h does the following pair of equations have unique solutions?9x + hy = 73x + 2y = 61. All value except 32. All value except 63. All value except 14. All value except 4 |
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Answer» Correct Answer - Option 2 : All value except 6 Given: 9x + hy = 7 3x + 2y = 6 Concept used: If (a1/a2) ≠ (b1/b2) then the system of equations a1x + b1y + c1 = 0 and a2x + b2y + c2 = 0 has a unique solution Calculation: 9x + hy – 7 = 0 ....(1) where, a1 = 9, b1 = h and c1 = -7 3x + 2y – 6 = 0 where, a2 = 3, b2 = 2 and c2 = -6 ....(2) According to the question (a1/a2) ≠ (b1/b2) ⇒ (9/3) ≠ (h/2) ⇒ 3 ≠ h/2 ⇒ h ≠ 6 ∴ Required answer is all value except 6 |
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| 23029. |
A body initially at rest ( `theta = 0)` and `omega = 0` at `t = 0` ) and is accelerated over a circular path of radius `R = 1 m` as per the relation, `alpha = 120 t^(2) - 48 t + 16 "rad"//s^(2)`. At time t = 1 secA. angular velocity `omega = 32 "rad"//s`B. angular displacement `theta = 10` rad.C. tangential acceleration `a_(T0 = 88 m//s^(2)`D. centripetal acceleration `a_(c ) = 1024 m//s^(2)` |
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Answer» Correct Answer - A::B::C::D `underset(0)overset(omega)int d omega = underset(0)overser(1)int alpha dt = underset(0)overset(1)int (120t^(2) - 48t + 16) dt` `underset(0)overset(theta)int d theta = underset(0)overset(1)int omega dt` `a_(T) = R alpha` `a_(C ) = omega^(2) R` |
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| 23030. |
If `y=x-x^(2)` is the of the path of a projectile, then which of the following is incorrect:A. Range `= 1m`B. Maximum height `= 0.25 m`C. Time of flight `= 0.5 m`D. Angle of projection `= 45^(@)` |
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Answer» Correct Answer - A::B::D `y = x tan theta - (gx^(2))/(2u^(2) cos^(2) theta) = x tan theta [1 - (x)/(R )]` `y = x - x^(2) = x [1 - x]` `tan theta = 1 rArr theta = 45^(@)` `(g)/(2u^(2) cos^(2) theta) = 1, R = 1 m` `u = sqrt((g)/(2 ((1)/(sqrt2))^(2))) rArr u = sqrtg` `H_("max") = ((u sin theta)^(2))/(2g) = (sqrt(g)(1)/(2))^(2)/(2g)` `H_("max") = (g)/(2 xx 2g) = (1)/(4) m` `T = (2 u sin theta)/(g) = 2 xx sqrtg xx (1)/(sqrt2 xx g) = sqrt((2)/(g)` |
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| 23031. |
If in ∆ABC, a, b and ∠C are given, then the area of ∆ABC is(A) absinC(B) abcosC(C) 1/2absinC(D) 2absinC |
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Answer» Correct option is: (C) \(\frac{1}{2}\)absinC |
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| 23032. |
From a point T the length of the tangent to a circle is 12cm and the distance of T from the centre is 13cm. The radius of circle is – (A) 6 cm (B) 12.5 cm (C) 25 cm (D) 5 cm |
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Answer» Correct answer is (D) 5 cm |
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| 23033. |
Maximum value of the expression ` (10x^(12))/(x^(24)+2x^(12)+3x^(16)+3x^(8)+1)`A. 1B. 2C. 10D. 5 |
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Answer» Correct Answer - A `f(x)=(10)/(x^(12)+2+3x^(4)+(3)/(x^(4))+(1)/(x^(12)))` `=(10)/((x^(4)+(1)/(x^(4)))^(3)+2)` As `x^(4)+(1)/(x^(4))ge2` `rArr(x^(4)+(1)/(x^(4)))^(3)+2ge10` `:. F(x) le(10)/(10)` |
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| 23034. |
If `l^r(x)` means `logloglog.......x` being repeated `r` times, then `int [ (x l(x) l^2(x) l^3(x) .... l^r (x)]^(-1) dx` is equal to :A. `l^(r+1) (x) +c`B. `(l^(r+1)(x))/(r+1)+c`C. `l^(r)(x) +c`D. None of these |
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Answer» Correct Answer - A `int(1)/(xl(x)l^(2)(x)....l^(r-1)(x)l^(r)(x))dx` f(x)=t `rArr(1)/(l^(r-1)x.l^(r-2)x...x)dx=dt` `:. int(dt)/(t)=ln|t|+c` `" " l^(r+1)(x)+c` |
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| 23035. |
The first nuclear reaction ever observed was by ernest Rutherford in 1919. It was triggered by alpha particles incident on an isotope of nitrogen `._(7)^(14)` N. He observed a proton was emitted along with another element x. Let us assume that `._(7)^(14)` N nucleus was initially stationary. For this reaction to occur, alpha-particle must touch the nitrogen nucleus. The distance between their centres at this moment is d. For this problem, we will neglect the effect of outer electrons in `._(7)^(14)` N. Symbols have their usual meanings. The minimum initial kinetic energy of alpha-particle so that reaction can occur isA. `(18ke^(2))/(R_(0)(2^(2//3)+14^(2//3)))`B. `(14ke^(2))/(R_(0)(2^(2//3)+14^(1//3)))`C. `(18ke^(2))/(R_(0)(2^(2//3)+14^(1//3)))`D. `(14ke^(2))/(R_(0)(2^(2//3)+7^(2//3)))` |
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Answer» Correct Answer - C `1/2muv_(rel)^(2) =(kq_(1)q_(2))/d` `1/2xx(4mxx14m)/(4m+14m)v_(rel)^(2)=(kxx2xxexx7e)/(R_(0)(14^(1//3)+2^(2//3)))` `1/2xx4m v_(rel)^(2)=(18ke^(2))/(R_(0)(14^(1//3)+2^(2//3)))` |
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| 23036. |
At any instant a current of 2 A is increasing at a rate of `1 A//s` through a coil of indcutance 2 H. Find the energy (in SI units) being stored in the inductor per unit time at that instant. |
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Answer» Correct Answer - 4 `U=1/2 Li^(2)` Energy stroed per unit time `(dU)/(dt) = 1/2 L2i (di)/(dt) =Li(di)/(dt) = 2 xx 2 xx 1 =4 J//s`. |
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| 23037. |
At what value of the resistance in the circuit shown in the figure will the total resistance between points A and B be independent of the number of cells? If `R = (sqrt(3)+1)Omega`, then the value of x will be `"…….."`Q. |
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Answer» Correct Answer - B `x = ((2R+x)R)/(3R+x)` `3Rx + x^2 = 2R^2 + Rx ` `x^2 + 2Rx - 2R^2 = 0` `x = -2R+-(sqrt(4R^2+8R^2))/2 = R(sqrt3 -1)` `= (sqrt(3) + 1) (sqrt(3) -1) = 3-1 = 2Omega`. |
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| 23038. |
An electric current of `2.0` A passes through a wire of resistance `25 Omega`. How much heat will be developed in 1 minute? |
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Answer» `i = 2A, R = 25 W, t = 1min = 60 s ` Heat developed `=i^2 Rt = (2 xx 2xx 25 xx 60) = 100 xx 60 J` `= 6000J`. |
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| 23039. |
The current in a conductor and the potential difference across its ends are measured by an ammeter and a voltmeter.The meters draw negligible current.The ammeter is accurate but the vlotmeter has a zero error(that is ,it does not read zero when no potential difference is applied).Calculate the zero error if the readings for two different conditions are 1.75A, 14.4Vand 2.75a, 22.4V. |
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Answer» Correct Answer - D Let the voltmeter reading when the voltmeter has zero error be V. `(l_1R)/(l_2R) = V_1/V_2 or (1.75)/(2.75) = (14.4 - V)/(22.4 - V) or 7/11 = (14.4-V)/(22.4-V)` or `7 xx (22.4 -V) = 11(14.4 -V)` or `156.8 - 7V = 158.4 - 11V or V = 0.4V.` |
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| 23040. |
Find the current in the resistor shown in figure. |
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Answer» Potential difference across each of the resistors will be zero , hence, no current in any resistor. |
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| 23041. |
What is motivation |
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Answer» Motivation is the process that initiates, guides, and maintains goal-oriented behaviors. It is what causes you to act, whether it is getting a glass of water to reduce thirst or reading a book to gain knowledge. Motivation involves the biological, emotional, social, and cognitive forces that activate behavior. |
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| 23042. |
If MALE = 31 and PLAY = 54 than CLASS = ? (A) 35 (B) 31 (C) 54 (D) 45 |
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Answer» Correct option (C) 54 Explanation: MALE → 13 + 1 + 12 + 5 = 31 PLAY → 16 + 12 + 1 + 25 = 54 CLASS → 3 + 12 + 1 + 19 + 19 = 54 |
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| 23043. |
Study the pie-chart given and answer the questions that follow:(a) What are the two types of movies liked by equal percentage of people? (b) Which type of movie is preferred by most number of people? (c) Which ty pe is least enjoyed and favoured by people? |
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Answer» (a) Science fiction based movies and comedies are liked by equal percentage of people. (b) Romantic movies are preferred by most number of people. (c) Drama is least enjoyed and favoured by people. |
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| 23044. |
Why do you think you see a full image of yourself when you look at the mirror but you cannot see a reflection of yourself when you look at the book? |
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Answer» Mirror is a polished surface which reflects light. Reflected light when produced backwards intersect to produce the image whereas book is a non-reflecting surface so no image is seen. |
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| 23045. |
Assertion`:-` A particle having zero acceleration must have constant speed. Reason `:-` A Particle having constant speed must have zero acceleration.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False |
| Answer» Correct Answer - C | |
| 23046. |
Assertion `:-` If you are squating down and sudenly get up, you can temporarilly feel light heated. Reason `:-` Blood flows down from head when we suddenly rise.A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.B. If both Assertion & Reason are True but Reason is not a correct explanation of the Assertiion.C. If Assertion is True but the Reason is False.D. If both Assertion & Reason are False |
| Answer» Correct Answer - A | |
| 23047. |
In a certain code, COMPUTER is written as RFUVQNPC. How is MEDICINE written in the same code ? (A) EOJDJEFM (B) EOJDEJFM (C) MFEJDJOE (D) MFEDJJOE |
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Answer» Correct option (A) EOJDJEFM Explanation: First letter of COMPUTER shifted to last and O + 1 = P then M + 1 = N and P + 1 = Q and so on. So by following the code MEDICINE is coded as option A. |
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| 23048. |
Which of the following words would correctly decode the word ZHOFRPH if the simple alphabet shifting code is used ? (A) ARTISTS (B) COMPUTE (C) MAILING (D) WELCOME |
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Answer» Correct option (D) WELCOME Explanation: As given code is obtained by moving each letter of the word WELCOME three steps ahead. |
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| 23049. |
Scientists are working hard to develop nuclear fusion reactor Nuclei of heavy hydrogen, `_(1)^(2)H` , known as deuteron and denoted by `D`, can be thought of as a candidate for fusion rector . The `D-D` reaction is `_(1)^(2) H + _(1)^(2) H rarr _(2)^(1) He + n+` energy. In the core of fusion reactor, a gas of heavy hydrogen of `_(1)^(2) H` is fully ionized into deuteron nuclei and electrons. This collection of `_1^2H` nuclei and electrons is known as plasma . The nuclei move randomly in the reactor core and occasionally come close enough for nuclear fusion to take place. Usually , the temperature in the reactor core are too high and no material will can be used to confine the to plasma for a time `t_(0)` before the particles fly away from the core. If `n` is the density (number volume ) of deuterons , the product` nt_(0) `is called Lawson number. In one of the criteria , a reactor is termed successful if Lawson number is greater then `5 xx 10^(14) s//cm^(2)` it may be helpfull to use the following boltzmann constant `lambda = 8.6 xx 10^(-5)eV//k, (e^(2))/(4 pi s_(0)) = 1.44 xx 10^(-9) eVm` Assume that two deuteron nuclei in the core of fusion reactor at temperature energy `T` are moving toward each other, each with kinectic energy `1.5 kT` , when the seperation between them is large enough to neglect coulomb potential energy . Also neglate any interaction from other particle in the core . The minimum temperature `T` required for them to reach a separation of `4 xx 10^(-15) m ` is in the rangeA. `1.0 xx 10^(9) K lt T lt 2.0 xx 10^(9) K`B. `2.0 xx 10^(9) K lt T lt 3.0 xx 10^(9) K`C. `3.0 xx 10^(9) K lt T lt 4.0 xx 10^(9) K`D. `4.0 xx 10^(9) K lt T lt 5.0 xx 10^(9) K` |
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Answer» Correct Answer - A From energy conservation `2((3)/(2)kT)=(1)/(4 pi epsilon_(0))(e^(2))/(r)` `rArr T = ((1.44 xx 10^(-9)))/((8.6 xx 10^(-5)))xx(1)/(3xx4xx10^(-15))` `=1.39 xx 10_(9) K`. |
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| 23050. |
Scientists are working hard to develop nuclear fusion reactor Nuclei of heavy hydrogen, `_(1)^(2)H` , known as deuteron and denoted by `D`, can be thought of as a candidate for fusion rector . The `D-D` reaction is `_(1)^(2) H + _(1)^(2) H rarr _(2)^(1) He + n+` energy. In the core of fusion reactor, a gas of heavy hydrogen of `_(1)^(2) H` is fully ionized into deuteron nuclei and electrons. This collection of `_1^2H` nuclei and electrons is known as plasma . The nuclei move randomly in the reactor core and occasionally come close enough for nuclear fusion to take place. Usually , the temperature in the reactor core are too high and no material will can be used to confine the to plasma for a time `t_(0)` before the particles fly away from the core. If `n` is the density (number volume ) of deuterons , the product` nt_(0) `is called Lawson number. In one of the criteria , a reactor is termed successful if Lawson number is greater then `5 xx 10^(14) s//cm^(2)` it may be helpfull to use the following boltzmann constant `lambda = 8.6 xx 10^(-5)eV//k, (e^(2))/(4 pi s_(0)) = 1.44 xx 10^(-9) eVm` Result of calculations for four different design of a fusion reactor using `D-D` reaction are given below. which of these is most promising based on Lawson criterion ?A. deuteron density `= 2.0 xx 10^(12) cm^(-3)`, cofinement time `= 5.0 xx 10^(-3) s`B. deuteron density `= 8.0 xx 10^(14) cm^(-3)`, cofinement time `= 9.0 xx 10^(-1) s`C. deuteron density `= 4.0 xx 10^(23) cm^(-3)`, confinement time `= 1.0 xx 10^(-11) s`D. deuteron density `= 1.0 xx 10^(24) cm^(-3)`, confinement time `= 4.0 xx 10^(-12) s` |
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Answer» Correct Answer - B `nt_(0) gt 5 xx 10_(14) s//cm_(3)` for deuteron density `= 8.0 xx 10_(-4) cm_(-3)` confinement time `= 9.0 xx 10_(-1) s` `n t_(0) = 7.2 xx 10_(14) s//cm_(3)` |
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