Explore topic-wise InterviewSolutions in Current Affairs.

This section includes 7 InterviewSolutions, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.

1.

consider the following statements (I-II) about organic farming.A. II,III and IVB. III and IVC. II and IIID. I and II

Answer» Correct Answer - C
Out of the gine statements II and III are correct as organic farming is the form of agriculture that relies on techniques such as crop raotation green manue=re compost and biologicla pest control to maintain soilil productiveiy and control pest on a farm organic farming excludes or striclty likits the use of manufactured fertilises pesticides (which include herbicides insecticides and fungicides ) plant growth regualtors such as hormons food additives and geneticlaly modified organisma
2.

When two unrelated individuals or lines are crossed, the perfomance of `"F"_(1)` hybrid is often superior to both its parents. This phenomenon is called:A. transformationB. splicingC. metamorphosisD. heterosis

Answer» Correct Answer - D
The supeiority of hybrids over either of the parents (doinaant or recessive) is called hybrid vigour (G shull) .Heterosis is equivalent of hybrids vigour.
3.

The guru and his disciples found three persons Standing before the gate and shouting at one another. They were about to come to blows. In the moonlight, the sentries seated atop the wall were enjoying their quarrel.The guru observed the three men and listened to their angry exchanges. He soon understood the cause of their dispute. The three were the residents of the town, but had been locked out as they were late in returning from some pleasure- trip.One of them, who was drunk, proposed that they should storm the gate and march into the town over the smashed metal-plated doors. “Heroes that we are, this will be the right thing for us to do,” he claimed.(1) What did the guru and his disciples find?(2) How did the guru come to understand the cause of the three persons ?(3) What was the cause of their dispute ?(4) What did the drunk man suggest?(5) What does the phrase ‘Come to blows’ mean ?

Answer»

(1) The guru and his disciples found three persons standing before the gate and shouting at one another.

(2) The guru observed the three men and listened to their exchanges, and soon understood the cause of their dispute.

(3) The three men were the residents of the town, but had been locked out as they were late in returning from some pleasure-trip.

(4) The drunk man suggested that they should storm the gate and march into the town over the smashed metal-plated doors.

(5) The phrase ‘Come to blows’ means ‘to get into a fight, often physically’.

4.

Ang Dorjee was going to climb without oxygen. But because of this, his feet would get very cold. He thus wanted to avoid long exposure at heights and a night at the Summit Camp.He had therefore to either get to the peak and back to the South Col the same day or abandon the attempt. He was keen to start immediately and asked if I would like to go with him.Going to the top from the South Col and back in a day would be strenuous (full of activity which need lot of energy and effort) and tough and there was the risk of Ang Dorjee turning back if his feet got too cold.I however, had full confidence in Ang Dorjee as well as in my stamina and climbing capability. Besides no one else was ready to move at that time.(1) Why did Ang Dorjee want to avoid long exposure at heights?(2) Why had Ang Dorjee to come back to the South Col the same day?(3) What was the problem in going to the top from the South Col and back in a day?(4) Did they still decide to climb on ? Why ?(5) Pick out from the ‘ text the words that are similar in meanings to:(i) leave(ii) strength to sustain

Answer»

(1) Ang Dorjee wanted to avoid long exposure at heights because in that case his feet would get very cold.

(2) Ang Dorjee had to come back to the South Col the same day because he wanted to avoid a night at the Summit Camp.

(3) Going to the top from the South Col and back in a day would be strenous and tough and if Ang Dorjee’s feet got too cold, he would not be able to come back.

(4) Yes, they still decided to climb on as Bachendri had full confidence in Ang Dorjee as well as in her own stamina and climbing capability.

(5) The similar words from the text are:
(i) abandon
(ii) stamina

5.

“Most of the arguments are like this-unrelated to reality. None of the three could have done what he proposed to do. Yet he was eager to prove the superiority of his method over the other methods.What is more important, there was a method different from theirs-a simple and healthy method. That was to give their identity to the sentries and request them to open the gates. They would rather cling to their false and unreal methods than thinking of the simple and true method,” observed the guru.The two disciples kept quiet. They understood ) what the guru had in mind-their conduct. Many beliefs are imposed on others in the name of religion which are insignificant. Controversies resulting from discussion over such issues are meaningless and avoidable.Often ignorance and ego are the major barriers (blocks) in solving complex situations; whereas a humble mind can avoid unnecessary debate and present a simple solution to even complex issues.(1) Why were most of the arguments made c by the three men unrelated to reality?(2) What was each of the three men trying to do?(3) What was the simplest method for them to get their purpose solved?(4) What are the major barriers in solving complex situations?(5) What can a humble mind do in critical situations .

Answer»

(1) Most of the arguments made by the three men were unrelated to reality because s since they were not practicable, none of the three ; could have done what they proposed to do.

(2) Each of the three men was trying to prove the superiority of his method over the other methods.

(3) The simplest method for them to get their purpose solved was to give their identity to the sentries and request them to open the s gates for them.

(4) Often ignorance and ego are the major barriers in solving complex situations.

(5) A humble mind can avoid unnecessary debate and present a simple solution to even complex issues.

6.

Alcoholic fermentation is brought about by _______.(A) Lactobacillus (B) Saccharomyces (C) Trichoderma (D) Streptomyces

Answer»

(B) Saccharomyces

7.

Which of the following binds to G-actin?(a) thymosin(b) lysin(c) kinesin(d) chymosin

Answer» The correct answer is (a) thymosin

For explanation I would say: Thymosins are the proteins that bind to G-actin and prevent their polymerization. Actin-ATP monomers are referred to as G-actin.
8.

Which of the following is not a photosynthetic pigment?(A) Carotene (B) Xanthophyll (C) Phycobillins (D) Anthocyanin

Answer»

(D) Anthocyanin

9.

Which one of the following is a stop codon?(A) UAG (B) UAC (C) AUG (D) UCA

Answer»

Answer is:

(A) UAG

10.

NAD⁺ can be derived from which vitamin?(a) A(b) C(c) Riboflavin(d) Niacin

Answer» Right choice is (d) Niacin

Easy explanation: NAD⁺ is the reduced state of the coenzyme NAD. It is derived from the vitamin niacin and is loosely bound to the enzyme dehydrogenase.
11.

Energy released by catabolic pathways is stored in how many forms?(a) 1(b) 2(c) 3(d) 4

Answer» Right choice is (b) 2

Explanation: Energy released by catabolic pathways is stored primarily in two forms: high energy phosphates like adenosine triphosphate and high energy electrons (NADPH).
12.

Which is correct pair for edible part ?A. Tamoto-ThalamusB. Maize-CotyledonsC. Guava-MesocarpD. Date-Mesocarp

Answer» Correct Answer - D
Date-Mesocarp is correct match for edible part.
13.

The protruding invaginated sheets inside mitochondria is known as _____(a) Cristae(b) Fimbrae(c) Hyphae(d) Cellular Digestion

Answer» The correct choice is (a) Cristae

The explanation is: The structure of mitochondria under the microscope is bean shaped with inner and outer mitochondrial membranes surrounding it. The inner membrane invaginates inside to produce finger-like protrusions known as the Cristae.
14.

Decarboxylation of pyruvate group takes place in the ________________(a) outer mitochondrial membrane(b) inner mitochondrial membrane(c) mitochondrial matrix(d) cytosol

Answer» Right option is (d) cytosol

For explanation I would say: The process of converting pyruvate to cellular energy molecules is known as the Krebs cycle. This process decarboxylates pyruvate using enzymes present in the mitochondrial matrix.
15.

Pyruvate undergoes oxidative decarboxylation to produce _______. (A) 2-PGA (B) α-Ketoglutarate (C) Succinyl - Co- A (D) Acetyl - Co – A

Answer»

(D) Acetyl - Co – A

16.

The process of DNA melting can be monitored by a change in ___________(a) absorbance(b) pH(c) concentration(d) color

Answer» Right answer is (a) absorbance

For explanation I would say: DNA melting is the process where DNA is dissolved in saline solution and the temperature is increased to initiate the process of separation. When DNA separates into its component strands, the absorbance of dissolved DNA increases and this serves as a parameter for monitoring the process.
17.

After incorporation into growing actin filaments, the associated ATP is _____________(a) degraded(b) lysed(c) hydrolyzed(d) esterified

Answer» The correct option is (c) hydrolyzed

Explanation: Actin units are added to the growing microfilament chain by the use of ATP. Each Actin subunit binds an ATP molecule. This ATP molecule is hydrolysed to ADP while the Actin unit is attached to the chain.
18.

Even during vigorous exercise, the blood supply does not increase in case ofA. HeartB. BrainC. KidneyD. Skin

Answer» Correct Answer - B
Even during vigorous exercise, the blood supply does not increase in case of brain
19.

Absence of the intermediate filament desmin, has a negative impact on _______________(a) hepatocytes(b) nerve cells(c) epithelial cells(d) muscle cells

Answer» The correct answer is (d) muscle cells

To elaborate: Absence of intermediate filaments desmins makes the muscle cells extremely fragile. Desmin polypeptide plays a key role in maintaining the alignment of myofibrils of the muscle cells.
20.

Which ones are bile salts?A. Haemoglobin and biliverdinB. Bilirubin and biliverdinC. Bilirubin and haemoglobinD. Sodium glycolate and taurocholate

Answer» Correct Answer - D
Sodium glycolate and taurocholate are bile salts.
21.

Gametophyte of fern is called.A. ProthallusB. ProtonemaC. CapsuleD. Columella

Answer» Correct Answer - A
Gametophyte of fern is called prothallus.
22.

Specify one advantage of developing vectors based on M13.

Answer»

Genes cloned can be obtained in the form of single stranded DNA. Since genome is less than 10 kb in size, RF can be purified and manipulated exactly like a plasmid.

23.

Walter de la Mare was born in the year.........(a) 1853(b)  1867(c) 1873(d) 1889

Answer»

Walter de la Mare was born in the year 1873.

24.

"You're an idiot! he shouted,there is absolutely no future for a boy you"

Answer»

This line has been taken from 'The Artist' written by a celbrated Japaness short story writer of the twenth century shiga Naoya. Through this dialogue a tea cher scolds a boy named seibei not to do foolish gourd during class or in the class room.

25.

This ashram was built in 1921 by Satish Chandra Dasgupta. He came here a number of times between 1938 to 1947. In 1939, after the Tripuri Congress ashram played host to a hisotric meeting between Mahatma Gandhi, Subhash Chandra Bose and Jawaharlal Nehru. One of the significant visits of Gandhiji was on October 29, 1946. It was from here, on November 6, 1946, he left for Noakhali. Name this ashram in North 24-Parganas district of West Bengal

Answer»

Khadi Pratisthan-Sodepur

26.

National Education Day is celebrated on ________ every year.1. 27th October2. 4th March3. 17th September4. 11th November

Answer» Correct Answer - Option 4 : 11th November

The correct answer is 11th November.

  • National Education Day is celebrated in India on 11th November.
  • The day is celebrated as a mark of respect to Maulana Abul Kalam Azad.

  • He was a freedom fighter and independent India’s first Education Minister (served from 1947 to 1958).
  • He was an eminent scholar of Urdu, Persian, and Arabic.
  • He was awarded the Bharat Ratna in 1992.
27.

Lomov is a man of.......... temperament.(a) happy(b) Negative (c) sad (d) nervous

Answer»

Lomov is a man of nervous temperament.

28.

In the UN Security Council there are:1. 10 permanent and 10 non-permanent members2. 5 permanent and 10 non-permanent members3. 5 permanent and 5 non-permanent members 4. 10 permanent and 5 non-permanent members

Answer» Correct Answer - Option 2 : 5 permanent and 10 non-permanent members

The correct answer is 5 permanent and 10 non-permanent members.

  • UN Security Council
    • The Security Council has primary responsibility for the maintenance of international peace and security.
    • It is one of the six principal organs of the United Nations (UN).
    • It is consists of 15 members of which 5 are permanent while the other 10 are non-permanent members.
    • The permanent members are China, Russian Federation, France, the USA, and the United Kingdom.

  • The UNO was formed on 24 October 1945.
  • It was founded in San Francisco, USA.
  • The headquarters were shifted to New York in 1946.
29.

How does Mehta’s novel redefine traditional values ? रमा मेहता का उपन्यास किस प्रकार परम्पराओं के मूल्यों को पुनः परिभाषित करता है?

Answer»

Generally, people have condemned traditions and customs so vehmently that they are looked upon scornfully by the modern youths. But such a scornful view for our customs and traditions is not wholly justified. Rama Mehta has beautifully re-assessed the significance of Indian customs and traditions. The tradition which does not allow a daughter-in-law to talk to her father-in-law cannot be justified in any way. Similarly, the touching of feet of the elders cannot be condemned. The love between the master and the servant is a noble example to follow. Thus, through her novel, Rama Mehta has given a new definition to the values of tradition.

साधारणतः लोगों ने परम्पराओं और रीति-रिवाजों को इतने जोश से नकारा है कि वर्तमान युवक उनको घृणा की दृष्टि से देखता है। परन्तु हमारी परम्पराओं और रीति-रिवाजों के प्रति ऐसा घृणित दृष्टिकोण पूर्णतः न्यायसंगत या उचित नहीं है। रमा मेहता ने बड़ी सुंदरता से भारतीय परम्पराओं तथा रीति-रिवाजों के महत्त्व को पुनः सुनिश्चित किया है। वह परम्परा जो एक वधु को अपने ससुर से सीधे बात करने की अनुमति नहीं देती है उसको किसी प्रकार भी उचित नहीं कहा जा सकता। इसी प्रकार बड़ों के चरणों को स्पर्श करने की प्रथा को रद्द नहीं किया जा सकता। स्वामी और सेवक के बीच प्यार होना एक भलो उदाहरण है जिसका अनुसरण किया जाना चाहिए। इस प्रकार रमा मेहता ने परम्पराओं को तथा रीति-रिवाजों के मूल्यों को नई परिभाषा दी है।

30.

EDP should organized normally by(A) 6 weeks duration (B) 4 weeks duration(C) 8 weeks duration (D) 10 weeks duration

Answer»

EDP should organized normally by 4 weeks duration.

31.

The book Entrepreneur written by(A) B.C. Tendon (B) Mold David M.(C) Pinchat Gifford III (D) Maier and Balwin

Answer»

The book Entrepreneur wrote by Mold David M.

32.

Rama Mehta presents an interesting account of everyday life of the Haveli. Discuss. रमो मेहता हवेली के दैनिक जीवन का रोचक वर्णन करती हैं। चर्चा कीजिये।

Answer»

Rama Mehta presents a verbal picture of the scenes and events in her novel. Her characters through the dialogues come alive before us. Both the males and the females have this quality of showing their inner selves. Khyali, the cook speaks to the maids attentively, listens to them but slips in to stir his dal. Dhapu is very clever. She poses to know better than other maids about the mystery of the haveli. The servants’ children shout and run about naturally. Gangaram is a merry-go-lucky fellow. Equally realistic is the scene of the wedding party. The beating of the drums and the sound of jingling trinklets of the ladies and the maids arrest one’s attention.

रमा मेहता अपने उपन्यास में दृश्यों और घटनाओं की शाब्दिक तस्वीर प्रस्तुत करती है। उसके पात्र अपने संवादों के द्वारा हमारे सामने जीते जागते आ खड़े होते हैं। पुरुष और स्त्री दोनों पात्रों में अपने अन्दर की भावनाओं और विचारों को अभिव्यक्त करने का गुण है। ख्याली रसोईया सेविकाओं से बातें करता है और उनकी बातें ध्यान से सुनता है, परन्तु दाल हिलाने के लिये रसोई में खिसक जाता है। धापू हद से ज्यादा होशियार है। वह हवेली के रहस्यों को और सेविकाओं से अधिक जानने का दावा करती है। नौकरों के बच्चे प्राकृतिक रूप से शोर करते हैं। गंगाराम मस्तमौला आदमी है। बारात का जलूस भी सचमुच वास्तविक है। ढोलों का बजना, पाजेबों की छनछनाहट हमारे ध्यान को आकर्षित करते हैं।

33.

The Brahmo Samaj was formed in ______.1. 18322. 18283. 18264. 1830

Answer» Correct Answer - Option 2 : 1828

The correct answer is 1828.

  • The Brahmo Samaj, formed in 1828.
  • It prohibited all forms of idolatry and sacrificebelieved in the Upanishads and forbade its members from criticising other religious practices.
  • It critically drew upon the ideals of religions – especially of Hinduism and Christianity – looking at their negative and positive dimensions.
34.

'Manganiyars' and 'Langas' are folk musicians from the state of:1. Uttarakhand2. Haryana3. Chhattisgarh4. Rajasthan

Answer» Correct Answer - Option 4 : Rajasthan

The correct answer is Rajasthan.

  • Manganiyars or Langas are folk musicians from the state of Rajasthan.
  • The ancient folk tradition of Rajasthan is represented by them.
  • They also belong to the part of Sindh and Gujarat.

  • Raga music is the root of this folk tradition.
  • Many Lakhshan geets have been learned from them, which are in the pure unaltered raga.
  • Muslims are the patron of the raga.
  • Hindus are the patrons of Manganiyar.
  • Both traditions have one root in every other aspect.
  • On festive occasions, the community performs whenever called.
  • In wedding, birth and anniversary, they are called.
  • They perform with traditional old compositions with appropriate lyrics for each occasion.
35.

The Prarthana Samaj was established in Bombay in the year:1. 18982. 18893. 18674. 1876

Answer» Correct Answer - Option 3 : 1867

The correct answer is 1867.

  • Prarthana Samaj was founded by Atmaram Pandurang in 1867.
    • It was founded in Bombay.
    • It was formed to carry out social and religious reforms.
    • Dr Atmaram Pandurang was an Indian Physician and Social Reformer.

ReformEstablished OnFounder
Brahmo Samaj28 August 1828Raja Ram Mohan Roy
Arya Samaj7 April 1875Swami Dayanand Saraswati
Ramakrishna Mission1 May 1897Swami Vivekananda

 

36.

Which of the following is post disaster measure?1. Reconstruction2. Planning and Policies3. Early warning4. Zoning

Answer» Correct Answer - Option 1 : Reconstruction

The correct answer is Reconstruction.

  •  A Disaster is an event or series of events, which gives rise to casualties and damage or loss of properties, infrastructure, environment, essential services or means of livelihood on such a scale which is beyond the normal capacity of the affected community to cope with. 
  • As per Disaster Management Act, 2005, “disaster management” means a continuous and integrated process of planning, organising, coordinating and implementing measures which are necessary.
  • Disaster Management includes-
    • Prevention - Pre-Disaster Phase
    • Mitigation - Pre-Disaster Phase
    • Preparedness - Pre-Disaster Phase
    • Response - During disaster Phase
    • Recovery - Post-disaster Phase
    • Rehabilitation/Reconstruction- Post-disaster Phase
    • Development - Post-disaster Phase
37.

‘Bengal Gazette’, the first Newspaper in India was started in 1780 by1. Dr. Annie Besant2. James Augustus Hicky3. A. O. Hume4. Raja Ram Mohan Roy

Answer» Correct Answer - Option 2 : James Augustus Hicky

The correct answer is James Augustus Hicky

The First Newspaper of India Hickey's Bengal Gazette was published in Calcutta in 1780.

  • Hicky's Bengal Gazette or the Original Calcutta General Advertiser was an English language weekly newspaper published in Kolkata (then Calcutta), the capital of British India.
  • It was the first newspaper printed in Asia and was published for two years, between 1780 and 1782, before the East India Company seized the newspaper's types and printing press.
  • Founded by James Augustus Hicky, a highly eccentric Irishman who had previously spent two years in jail for debt, the newspaper was a strong critic of the administration of Governor-General Warren Hastings.
  • The newspaper was important for its provocative journalism and its fight for free expression in India.

Some important newspapers and journals are- 

NewspaperEditor/Founder
Hindoo PatriotMadhusudan
Rast GoftarDadabhai Naroji
Indian MirrorDevendranath Tagore
Amrita Bazar PatrikaSisir Kumar Ghosh and Motilal Ghosh
SudharakGG Agarkar
38.

The Act of _______ had introduced the system of separate electorates. (a) 1874 (b) 1893 (c) 1909 (d) 1926

Answer»

The Act of 1909 had introduced the system of separate electorates. 

39.

Who among the following had during his reign introduced a new calendar, a new system or coinage, and new scales or weights and measures? (a) Tipu Sultan (b) Murshid Quli Khan (c) Raghunath Rao (d) Lord Cornwallis

Answer»

(a)  Tipu  Sultan.

40.

Infanticide was completely banned by the (a) Bengal Regulation Act XVII of 1829 (b) Sharda Act, 1930 (c) Bengal Regulation Act XXI of 1795 (d) Minto-Morley reforms

Answer»

(c) Bengal Regulation Act XXI of 1795

41.

The Woods Despatch of 1854 resulted in the (a) Founding of several Indian universities (b) Introduction of the postal system (c) Establishment of the education system (d) Abolition of child marriage

Answer»

(c) Establishment of the education system

42.

The system of civil services had been introduced into India by (a) Lord Ripon (b) Lord Dalhousie (c) Lord Bentick (d) Lord Hastings

Answer»

(c) Lord Bentick

43.

A rod of mass `m` and length `l` is rotating about a fixed point in the ceiling with an angular velocity `omega` as shown in the figure. The rod maintains a constant angle `theta` with the vertical. What is the rate of change of angular momentum of the rod ? A. `(momega^(2)l^(2)sintheta)/(6)`B. `(momega^(2)l^(2)sin2theta)/(6)`C. `(momega^(2)l^(2)sin^(2)theta)/(6)`D. `(momega^(2)l^(2)cos^(2)theta)/(6)`

Answer» The vertical component of the angular momentum remains constant while its horizontal component keeps changing the direction.
`dL=(momegalsin(2theta))/(6)xxomegadtrArr(dL)/(dt)=(momega^(2)l^(2))/(6)sin(20)`
44.

A rod of mass `m` and length `l` is rotating about a fixed point in the ceiling with an angular velocity `omega` as shown in the figure. The rod maintains a constant angle `theta` with the vertical. What angle will the rod make with the vertical A. `cos^(-1)((g)/(omega^(2)l))`B. `cos^(-1)((2g)/(3omega^(2)l))`C. `cos^(-1)((3g)/(2omega^(2)l))`D. `cos^(-1)((3g)/(4omega^(2)l))`

Answer» `tau=(dL)/(dt)`
`Mg.(L)/(2)sintheta=(mu omega^(2)l^(2))/(6)sin(2theta)`
`rArrcostheta=((3g)/(2omega^(2)l))` or, `theta=cos^(-1)((3g)/(2omega^(2)l))`
45.

Rod `AB` of length `1m` is released from the shown position. End `A` undergoes perfect inelastic collision with ground `C` is mid-point of rod. Angular velocity of rod just after collision is `(3x)/2rad//sec`. Find `x`. (Assuming no slipping on ground)

Answer» Correct Answer - 5
Conserving angular momentum about point of impact.
`msqrt(2gh).L/2sintheta=(mL^(2))/3omega`
`impliesomega=3/2sin30^(@).(sqrt(2xxgH))/L=15/2rad//sec`
46.

A rod `AB` of length `2m` moves in horizontal `x-y` plane. At any instant end a of the rod is at origin and has velocity `vecv_(A)=2hati+v_(y)hatj`. The other end `B` at the same instant is moving with velocity `vecv_(B)=3hati+6hatj`. The rod makes an angle of `30^(@)` with the `x-`axis at this instant (see figure) The magnitude of angular velocity of the rod is A. `1 rad//sec`B. `sqrt(3)rad//sec`C. `(sqrt(3))/(2)rad//sec`D. `1//2 rad//sec`

Answer» Unit vector along rod `hatl=(sqrt(3))/(2)hati+(1)/(2)hatj`
`hatlvecv_(1)=hatlvecv_(2)rArrv_(y)=(6+sqrt(3))m//s`
`omega=(|vecv_(2)-vecv_(1)|)/(l)=1 rad//sec`
47.

The circuit shown in the figure above consists of eight resistors, each with resistance `R`, and a battery with terminal voltage `V` and negligible internal resistance. The current flowing through the battery is `n/4 V/R`, then `n` is

Answer» Correct Answer - 6
Equivalent resistance `=(2R)/3`
Current `=V/((2R)/3)=(3V)/(2R)`
48.

We have a thin spherical of radius `R`. Half of the sphere carrying surface change density `sigma_(1)` and rest half carrying `sigma_(2)`. Magnitude of force of electromagnetic interaction between hemispherical parts carrying surface charge density `sigma_(1)` and rest of the hemispherical portion is `f_(0)=alphaxx10^(4)` Newton. Here `alpha` is an integer. Value of `alpha` will be. Given `sigma_(1)sqrt(epsilon_(0))xx10^(2)cm//m^(2),sigma_(2)=4sigma_(1),R=sqrt(3/(pi)m)`A. `3`B. `4`C. `5`D. `6`

Answer» Correct Answer - D
`f=(piR^(2))/(2epsilon_(0)) sigma_(1) sigma_(2)`
`=pi 3/(pi) 1/(2epsilon_(0)) 4epsilon_(0)xx10^(4)=6xx10^(4)N`
49.

Three particles of equal masses are initial at the vertices of equilateral triangle of side `2sqrt(3)m` in horizontal plane. They start moving towards centroid `O` with equal speed `2m//sec`. After collision at `O`, A stops and `C` retraces its path with same speed. Distance between `B` and `C` just after one second of the collision is `alpham`. Here `alpha` is an integer. Find `alpha`.

Answer» Correct Answer - 4
Before collision, linear momentum of the system is zero. Therefore, after collision momentum of `B` will be equal and opposite to momentum of `C` (since `P_(A)=0`)
50.

A particle is moving with velocity `bar(v)=hat(i)+3hatj` and it produces an electrostatic field at a point given by `bar(E)=2hat(k)`. It will produce magnetic field at that point equal to (all quantities are in S.I. units and speed of light is `c`)A. `(6hati-2hatj)/(c^(2))`B. `(6hati+2hatj)/(c^(2))`C. zeroD. can not be determined from the given data

Answer» Correct Answer - A
`vec(B)=(mu_(0))/(4pi)q(vec(v)xxvec(r))/(r^(2))` and `vec(E)=1/(4piepsilon_(0)) (q vec(r))/(r^(3))`
`vec(B)=mu_(0)epsilon_(0)(vec(V)xxvec(E))(vec(v)xxvec(E))/(c^(2))`