DSSSB TGT Social Studies Female 15 Oct 2018 Official Paper (Shift 2) (Previous Year Paper)

The logic followed is:

The first number is the square of the second number 

Option 1: 49 : 7

First number = (Second number)²

49 = 7²

49 = 49

Option 2: 81 : 10

First number = (Second number)2

81 = 102

81 ≠ 100

Option 3: 36 : 6

First number = (Second number)2

36 = 62

36 = 36

Option 4: 121 : 11

First number = (Second number)2

121 = 112

121 = 121

Hence, the correct answer is "Option 2".

The logic followed is:

Option 1: 4 : 32

The second number is exactly divisible by the first number.

Option 2: 7 : 42

The second number is exactly divisible by the first number.

Option 3: 9 : 54

The second number is exactly divisible by the first number.

Option 4: 3 : 19

The given number is the pair of co-prime numbers.

Two numbers or integers are co-prime if their common factor is only 1. 

Hence, the correct answer is "Option 4".

Additional Information

• The priority will always be the prime number in the exams.
• There are some standard rules which need to be followed while selecting the priority.
• priority lists to be followed in exams according to their preferences are:

1. Prime number.
2. Square.
3. Cube.
4. Multiplication and divisions
5. Addition and subtraction.

• A prime number can be divided, without a remainder, only by itself and by 1.
• Some facts about the Prime numbers:

1. The only even prime number is 2. All other even numbers can be divided by 2.
2. If the sum of a number's digits is a multiple of 3, that number can be divided by 3.
3. No prime number greater than 5 ends in a 5. Any number greater than 5 that ends in a 5 can be divided by 5.
4. Zero and 1 are not considered prime numbers.
5. Except for 0 and 1, a number is either a prime number or a composite number. A composite number is defined as any number, greater than 1, that is not prime.

The family chart is as follows:

Drawing the family tree as per the given information:

Thus Pavitra's brother's father's mother is her Grandmother.

Hence, the correct answer is "Grandmother".

The logic followed is:

In all the given figures the common pattern is:

i) The two given figures are facing each other.

ii) The orientation of the figure is the same.

ii) Both the given figure are the same.

Option 1: 

i) The two given figures are facing each other.

ii) The orientation of the figure is not the same.

Thus this is not similar to the given figure pattern.

Option 2: 

i) The two given figures are facing each other.

ii) The orientation of the figure is the same.

Thus this is similar to the given figure pattern.

Option 3: 

i) The two given figures are facing each other.

ii) The orientation of the figure is the same.

ii) Both the given figure is not the same.

Thus this is not similar to the given pattern.

Option 4: 

i) The two given figures are facing each other.

ii) The orientation of the figure is not the same.

Thus this is not similar to the given figure pattern.

Hence, the correct answer is "Option 2".

The logic followed is:

Given:

Sales of the company 'XYZ' for the years 2016 & 2017. 

 

Thus the ratio of the sales of the company "XYZ" for quarter 2 (Q2) of 2016 to the sales of the company for quarter 2 (Q2) of 2017

⇒ 20 : 25

⇒ 4 : 5 

Hence, the correct answer is "Option 1".

The logic followed is:

Given arithmetic progressive series: 6, 10, 14, _ _ _ _ _

we can see a common difference = 4

First-term = 6 

To find nth term of an AP is, Tn = a + (n - 1)d

Thus 17^th term in this series ⇒ T₁₇ = 6 + (17 - 1)4

T₁₇ = 6 + (16)4

T₁₇ = 6 + 64

T₁₇ = 70

Hence, the correct answer is "70".

When the paper is unfolded it will appear like this:

The unfolded figure will be similar to the figure shown below:

Hence, the correct answer is "Option 2".

As we can see the given figure is embedded in Option 1. 

Hence, the correct answer is "Option 1".

In the First Dice and Second dice, 

Number 5 is common.

The left letter will be opposite to each other writing them clockwise starting from 5.

 

Hence, the correct answer is "1".

Additional Information

• Dices are of two types :

1. Standard Dice
2. Non-Standard Dice.

• Dice has:-

1. faces = 6
2. sides = 12
3. corners = 8

• Two opposite faces are never seen together.
• Adjacent faces are never opposite to each other.

The logic followed is:

Given statement: You are in the classroom and have not completed the homework that the teacher had given the previous day. The teacher asks to show the status of the homework.

Option 1: Suddenly escape from the class.

This shows your irresponsible behaviour and lack of a sense of responsibility. Escaping from the class is not the correct action. 

Option 2: Complain to the principal about the teacher.

This is not the correct action to be taken as this is your mistake. You haven't completed your homework. You must accept your fault.

Option 3: Say lie as "forget the homework book at the home".

This shows your escaping attitude. This shows your irresponsible behaviour and lack of a sense of responsibility.

Option 4: Politely ask for an apology for not completing homework and assure the work would be completed by the next day

This is the correct action to be taken. As you are accepting your fault and solving the issue by completing it by the next day. This shows a sense of responsibility and acceptance in your behaviour. 

Hence, the correct answer is "Option 4".

Key Points

• Checklist for attempting SRT questions:

1. Read the question and options carefully.
2. Look for options that are realistic, optimistic, and reflect officer-like qualities.
3. Do not skip any situation.
4. Relegate the negative sentences and choose the most logical option among the remaining. As time is an important factor, hence your thinking ability should be swift.
5. React quickly and be logical.

From the given diagram,

The shaded part represents the persons who speak either Gujarati or Marathi but not both.

= 68 + 72 + 26 + 17

= 183

Hence, "183" is the correct answer.

According to the given information,

The number of people present is n = 8.

The number of handshakes exchanged is,

n(n - 1) ÷ 2

= 8(8 - 1) ÷ 2

= 8(7) ÷ 2

= 8 × 7 ÷ 2

= 8 × 3.5

= 28

Here, number of handshakes exchanged is 28.

Hence, the correct answer is "28". 

Additional Information

To find the number of solutions of two consecutive integers we can use the formula n(n - 1) ÷ 2, where n is an integer.

The logic followed is:

In all the other options except option (2), the given words are correctly matched with the place they live in but option 2 is not correctly matched.

Option 1: Bee : Hive

Bees make hives to live in.

Option 2: Snake : Reptile

Snakes do not live in a place called Reptile. Reptile is a class name. Snakes are elongated, limbless, carnivorous reptiles of the suborder Serpentes. 

Reptiles are air-breathing vertebrates covered in special skin made up of scales, bony plates, or a combination of both. They include crocodiles, snakes, lizards, and turtles, etc. Because of their slow metabolism and heat-seeking behavior, reptiles are cold-blooded.

Option 3: Peasant : Cottage

Peasant makes cottage to live in.

Option 4: Spider : Web

The spider spins a web to live in.

Hence, the correct answer is "Option 2".

Given:

Mamatha has done graduation in Mechanical Engineering with 59% marks.

Her date of birth is 3.5.1991.

She is qualified in the selection process and has secured 45% marks in it.

She also has two years of post-qualification work experience.

All conditions are as follows;

 

Mamatha doesn't fulfill the criteria.

So, She is not eligible for any position. 

Hence, the correct answer is "The candidate is not to be selected".

The pattern followed is:

Hence, the correct answer is "WL".

Given that:

The average age of 3 persons = 25 years

Total age = 25 × 3 = 75 years

We know that father's sage = 40 years.

Then sum of both son's age = 75 - 40 = 35 years.

Let the age of the younger son be x years.

Then, the age of the elder son = (x + 3) years.

⇒ x + (x + 3) = 35 years

⇒ x + x + 3 = 35 years

⇒ 2x = (35 - 3) years

⇒ 2x = 32 years

⇒ x = 16 years

Thus the age of the younger son = 16 years.

Hence, the correct answer is "16 years".

The logic followed is:

The main purpose of graphs is not to show exact values of data, but to represent relations and connections between quantities.

There are five things about graphs that need our attention when designing graphs:

• visual structures.
• axis and background.
• scales and tick marks.
• grid lines.
• text.

The axis defines a graph and there is no (effective) graph without an axis. The first thing we should consider is the number of axis. That number depends on how many attributes we have or want to include. Usually, we use one vertical and one horizontal axis.

Thus we can say a graph without an axis is nothing.

Option 1: Parabola

A parabola is the set of all points(x,y) in a plane that is the same distance from a fixed line, called the directrix, and a fixed point (the focus) not on the directrix.

It is not compulsory to be present in the graph.

Option 2: Ellipse

An ellipse is the locus of all those points in a plane such that the sum of their distances from two fixed points in the plane, is constant.

The fixed points are known as the foci (singular focus), which are surrounded by the curve.

The fixed-line is directrix and the constant ratio is the eccentricity of the ellipse. Eccentricity is a factor of the ellipse, which demonstrates its elongation and is denoted by ‘e’.

It is not compulsory to be present in the graph.

Option 3: Axis

It is compulsory to be present in the graph. Thus we can say a graph without an axis is nothing.

Option 4: Line

A line without an axis is nothing. We need an axis to represent the data. 

Thus we can say the line is not compulsory but the axis is the most crucial thing which is always present in the graph.

Hence, the correct answer is "Axis".

The logic followed is:

In all the options except figure (B), the single side arrow is in opposite direction to each other when moving forward but in figure B three single-sided arrow is in the same direction to each other.

Figure A: 

The all single-sided arrow is in opposite directions to each other.

Figure B: 

All single-sided arrows are not following the same common pattern.

Three of the arrow is in the same direction which is different from the common pattern.

Figure C: 

The all single-sided arrow is in opposite directions to each other.

Figure D: 

The all single-sided arrow is in opposite directions to each other.

Hence, the correct answer is "Option 2".

The logic followed here is :

 

Given expression is : 18 - 6 + 12 × 4 ÷ 2 = ?

Replacing the signs as per the given directions and using BODMAS rule:

18 × 6 - 12 ÷ 4 + 2 = ?

= 18 × 6 - 3 + 2 = ?

= 108 - 3 + 2

= 110 - 3

= 107

Hence, the correct answer is "107".

When the paper is unfolded it will appear like this:

The unfolded figure will be similar to the figure shown below:

Hence, the correct answer is "Option 3".

The correct answer is Telangana.

Key Points

• Women perform Maha Bathukamma dance in a group wearing traditional pattu saree in Bathukamma festival.
• Bathukamma is a Flower and Cultural festival of Telangana.
• The ‘Bathukammas’ are basically the cone-shaped flower stack, at street corners and temples in the city.
• Every year this festival is celebrated as per the Sathavahana calendar for nine days starting Bhadrapada Pournami (also known as Mahalaya Amavasya or Pitru Amavasya) till Durgashtami, usually in September–October of the Gregorian calendar.
• Bathukamma is celebrated for nine days during Durga Navratri. It starts on the day of Mahalaya Amavasya and the 9-day festivities will culminate on "Saddula Bathukamma" or "Pedda Bathukamma" festival on Ashwayuja Navami, popularly known as Durgashtami which is two days before Dussehra.
• Historically, Bathukamma meant "festival of life" and was celebrated to thank Goddess Parvati for her blessings for the crop harvest and income she helped generate this (current) year and again ask her blessing for the next year.
• It is the festival for feminine felicitation.
• In Telugu, ‘Bathukamma' means ‘Mother Goddess come Alive’ and Goddess Maha Gauri-‘Life Giver’ is worshipped in the form of Bathukamma - the patron goddess of womanhood, Gauri Devi.
• The other being Bathukamma, as the daughter of the 'Chola' King 'Dharmangada' and 'Satyavati'. The king and queen lost their 100 sons on the battlefield and prayed to Goddess Lakshmi to be born in their house, as their child. Goddess Lakshmi heard their sincere prayers and chose to oblige them. When Lakshmi was born in the royal palace, all the sages came to bless her and they blessed her with immortality "Bathukamma or Live Forever". Since then Bathukamma festival is celebrated by young girls in Telangana. The purpose of this festival is to pray to the Goddess in the belief that the young girls would get husbands as per their wish, to teach the young girls how to take care of their in-laws, their husbands, be great women who respect elders, love people around them, a guide to their younger ones.

The correct answer is Horizon 2020.

Key Points

• Union Government and European Union (EU) have collaborated for a research programme named Horizon 2020 to develop Next Generation Influenza Vaccine to protect citizens across the globe.
• The European Commission (EC) and the Department of Biotechnology (DBT), Government of India have launched a flagship call on the next generation influenza vaccine.
• EU-India Flagship Initiative on influenza vaccine:
• Topic: Towards a next generation influenza vaccine to protect citizens worldwide – and EU-India collaboration
• Topic identifier: SC1- BHC-32-2019
• Type of Action: Research and Innovation action – single stage

 

• The EU's research and innovation framework programme Horizon 2020' (2014-2020), is fully open to the participation of entities from across the world in all parts of the programme, and many topics are flagged as being specifically relevant for cooperation with partners outside Europe such as India.
• The EC through the European Union funding programme for research and innovation 'Horizon 2020' has committed EUR 15 million and the Department of Biotechnology (DBT), Government of India, agreed to match that amount.
• In total, funding of EUR 30 million will thus be available for joint project proposals.
• Along with this EU-India collaboration are information and preparatory events scheduled: EU-India call on Next Generation Influenza Vaccine that is happening in four cities (New Delhi, Hyderabad, Bangalore and Pune) in India.
• Indian participants have therefore to find the financial resources for their participation in Horizon 2020 collaborative projects. These could be own funds or funds from Indian ministries, foundations and other organisations that fund international research and innovation activities.
• For this purpose, the Indian Department of Science (DST), the Indian Department of Biotechnology (DBT) and the Ministry of Earth Sciences (MoES) have established a Co-Funding Mechanism (CFM) to fund the successful Indian participants in a number of pre-identified calls of proposals.

The correct answer is Gujarat.

Key Points

• Palitana is an important city of pilgrimage holding the significance of salvation for the Jain community that is situated 50 km South-west of the Bhavnagar city in the state of Gujarat.
• Palitana is a full city with as many as 823 temples of different sizes, dedicated to the 24 Tirthankaras or holy saints of the Jain community.
• The temples are delicately sculpted in marble. The main temple of the first Tirthankara, Shree Adishwar has an elaborated architectural pattern.
• Since ancient times, it is been said that the number of people who achieved liberation is equal to the number of stones on the Shatrunjaya hills on whose foot is the Palitana city. Such is the divinity of these hills. Therefore, for the Jains, the temples on the Shatrunjaya hills are considered the most sacred place of pilgrimage.
• Jains believe that Adinath sanctified the mountain of Shatrunjaya by selecting it as the site of his first sermon.
• The conglomeration of temples was set up in two different time phases-some around the 11^th-12^th centuries and some around the 16^th centuries.
• The earlier temples of Palitana were built under the Royal patronage of King Kumarapala of the Solanki dynasty in the 11^th century CE. But most of these were destroyed by the invading Muslim rulers in the 13^th century CE.

Additional Information

The correct answer is Rikako Ikee.

Key Points

• Japanese swimmer Ikee Rikako has been named as the Most Valuable Player (MVP) of the 18^th edition of the Asian Games.
• She became the first female athlete to win the MVP title.
• Rikako bagged six gold and two silver medals in the tournament.
• She received $50,000 as prize money.

Additional Information

• The Olympic Council of Asia general assembly has selected the two countries to host the 2030 and 2034 editions of the Asian Games through virtual voting.
• Qatar will be the host of 2030's edition at Doha city, while the runner-up in voting and Saudi Arabia will host the 2034 edition of Asian Games at Riyadh city. The Olympic Council of Asia meeting held in Muscat, Oman.
• The following table represents the hosts of Asian games editions :

The correct answer is PART XVI.

Key Points

• Part XVI of our constitution contains the Special provisions relating to certain classes.
• Part XVI contains the article-330 to 342 (a).

Additional Information

The correct answer is Gopalpur.

Key Points

• The Indian Army Air Defence College is located in Gopalpur (Odisha).
• In 1963 Government of Orissa offered 3000 acres of land at Gopalpur-On–Sea along with a seaward firing range, it was finally decided to site the proposed AD Guided Missile (ADGM) School and Centre at Gopalpur-on-Sea, Orissa.
• The construction of infrastructure of Gopalpur Mil Station, which includes a Sup Depot, GE complex and KLP of AD Regt L-70 was completed prior to its inauguration by the then Prime Minister, Late Shrimati Indira Gandhi on 30 Oct 1984.
• ADGM School became functional on 01 Nov 1989 with the commencement of two Officers and five NCOs courses. In Nov 1998, the ADGM School was redesignated as Army Air Defence College (AADC).

Additional Information

The correct answer is 8^th.

Key Points

• Global consultant AT Kearney on May 3, 2018, released the Foreign Direct Investment (FDI) Confidence Index 2018.
• The index ranked India at the 11^th spot, three places down from the previous year. In the year 2017, India was ranked 8^th. It is the first time since 2015 that India has been pushed out of the top 10.
• India retained its position as the second highest-ranked emerging market on the Index.
• The United States (US) topped the index, followed by Canada at 2^nd and Germany at 3^rd place.
• Japan, the US, the UK and Singapore consistently serve as large sources of FDI for India.

Additional Information

• Foreign Direct Investment (FDI) Confidence Index - 
• The Kearney FDI Confidence Index is an annual survey of global business executives that ranks the markets likely to attract the most investment in the next three years.
• It is published by AT Kearney.
• The first report was released in 1998.
• The Index is constructed using primary data from a proprietary survey of 500 senior executives of the world’s leading corporations.
• The rankings are calculated based on questions about the respondents’ companies’ likelihood of making a direct investment in a market over the next three years.
• AT Kearney is a global consultancy firm.
• After coming in at the 16^th spot in 2019, India has dropped out of Kearney's 2020 Foreign Direct Investment Confidence Index.

The correct answer is Britain.

Key Points

• Features taken from Britain are the Parliamentary system, the office of CAG, the Rule of Law, and Single Citizenship.
• About CAG:
• The Constitution of India provides for an independent office of the Comptroller and Auditor General of India (CAG) in chapter V under Part V.
• The CAG is mentioned in the Constitution of India under Article 148 -151.
• He is the head of the Indian Audit and Accounts Department.
• He is the guardian of the public purse and controls the entire financial system of the country at both levels at the center and at the state.
• His duty is to uphold the Constitution of India and the laws of Parliament in the field of financial administration.
• Appointment and Term to Constitutionals Posts:
• The CAG is appointed by the President of India by a warrant under his hand and seal.
• He holds office for a period of six years or up to the age of 65 years, whichever is earlier.

The correct answer is Asad Ali Khan.

Key Points

• Asad Ali Khan 
• ​He was an Indian musician who played the plucked string instrument Rudra veena.
• Khan performed in the style dhrupad and was described as the best living Rudra veena player in India by The Hindu.
• He was awarded the Indian civilian honour Padma Bhushan in 2008.

Additional Information

The correct answer is Kapilvastu.

Key Points

• Gautam Buddha:
• He was born as Siddhartha Gautama in circa 563 BCE, in a royal family in Lumbini which is situated near the Indo-Nepal border.
• His family belonged to the Sakya clan which ruled from Kapilvastu, Lumbini.
• Buddha's father was Suddhodana, chief of the Shakya tribe that lived in ancient Kapilavast
• At the age of 29, Gautama left home and rejected his life of riches and embraced a lifestyle of asceticism or extreme self-discipline.
• After 49 consecutive days of meditation, Gautam attained Bodhi (enlightenment) under a pipal tree at Bodhgaya, Bihar.
• Buddha gave his first sermon in the village of Sarnath, near Varanasi in Uttar Pradesh. This event is known as Dharma Chakra Pravartana (turning of the wheel of law).
• He died at the age of 80 in 483 BCE at Kushinagar, Uttar Pradesh. The event is known as Mahaparinibban or Mahaparinirvana.
• He is believed to be the ninth of the ten incarnations of Lord Vishnu (Dashavatar).

The correct answer is -273.15°C.

Key Points

• Absolute zero is the lowest possible temperature and is a point at which fundamental particles of nature have minimal vibration motion resulting in retaining only quantum mechanical zero-point energy induced particle motion.
• It is equivalent to 0 Kelvin or -273° Celsius.
• It is practically impossible to reach out to the absolute zero temperature.
• It is the temperature at which the particles in the substance are essentially motionless which means that there is no way to slow them down further.
• Nothing can be colder than absolute zero on the Kelvin scale.

Additional Information

• Bose-Einstein Condensate is called the Fifth state of matter.
• It is formed when a gas of bosons having low densities is cooled to absolute zero temperature.
• This concept was first put by S N Bose and later developed by Albert Einstein and thus came to be known as Bose-Einstein condensate.

The correct answer is Ved Vyasa.

Key Points

• The famous epic Mahabharata was written by the sage Veda Vyasa.
• It is believed that only Lord Ganesha could write the tale of Mahabharata as said by Lord Brahma, so Maharishi Veda Vyasa asked him to write the tale as dictated by him.
• It is considered the longest poem ever written.
• Mahabharata and Ramayana are the two major Sanskrit epics of ancient India.

Additional Information

The correct answer is Ajomon (flying squirrel).

Key Points

2018 Asian Games Mascots:

• The trio of Bhin Bhin (bird of paradise), Kaka (one-horned rhino), and Atung (deer) are mascots of the 2018 Asian Games.
• These three represent the east, west, and center of the country and they have dress traditional to each locality.

 

About 2018 Asian Games:

• It is organised by the Olympic Council of Asia (OCA) since 1982, prior to that, it was regulated by Asian Games Federation (AGF).
• The first Asian Games were held in New Delhi, India in 1951.
• 2018 Asian Games concluded in Indonesia.
• The 18^th edition of this mega sporting event was held from August 18 to September 2, 2018, in two cities Jakarta (capital of Indonesia) and Palembang (capital of Indonesia’s province of South Sumatra).
• Indonesia had hosted it for the first time in 1962 in Jakarta.
• China has topped the medals tally with 132 gold, 92 silver, and 65 bronze followed by Japan and South Korea.
• India finished at eighth position both in terms of gold medals and total tally.
• India finished with 15 gold, 24 silver, and 30 bronze.
• The next Asian Games (19^th edition) are scheduled in Hangzhou, China between 10 and 25 September 2022.

The correct answer is Siam.

Key Points

• Thailand was formerly known as Siam.
• In 1938 Phibun succeeded as prime minister, with Pridi continuing with the finance portfolio.
• The Phibun administration promoted nationalism and in 1939 officially changed the nation’s name from Siam to Muang Thai (Land of the Free), or Thailand.
• Thailand is the Kingdom in Southeast Asia Country.

 

Important Points

• Thailand-
• Capital-Bangkok
• Currency-Baht
• Prime Minister- Mr. Prayut Chan-o-cha.

The correct answer is West Bengal.

Key Points

• The Board of Directors of the Asian Development Bank (ADB) had approved a financing package totalling $245 million to provide safe, sustainable, and inclusive drinking water service to about 1.65 million people in three districts of West Bengal state, India, affected by arsenic, fluoride, and salinity.
• With about 85% of water in India’s rural areas coming from groundwater, some 27 million people are at risk from arsenic and fluoride contamination.
• In West Bengal, more than 90% of the rural population relies on groundwater, making it home to about 72% of India’s population at risk from arsenic and 5% of the population at risk from fluoride contamination.
• High arsenic and fluoride levels in drinking water are a threat to public health in India, where West Bengal is by far the worst affected state.
• Through efficient use of surface water and a shift to piped water schemes, the ADB project will reduce the burden of disease from arsenic and fluoride while preserving groundwater and enhancing climate resilience.
• The project will provide continuous potable water through metered connections to about 390,000 individual households in three districts—Bankura, North 24 Parganas, and Purba Medinipur.

Additional Information

• About ADB:
• It is a regional development bank.
• Established on 19 December 1966.
• Headquartered — Manila, Philippines.
• Official United Nations Observer.
• Membership: The bank admits the members of the United Nations Economic and Social Commission for Asia and the Pacific (UNESCAP, formerly the Economic Commission for Asia and the Far East or ECAFE) and non-regional developed countries.
• Currently, it has 68 members.
• India was a founding member of the Asian Development Bank (ADB) in 1966 and is now the bank’s fourth-largest shareholder and top borrower.
• As of 31 December 2019, ADB’s five largest shareholders are Japan and the United States (each with 15.6% of total shares), the People’s Republic of China (6.4%), India (6.3%), and Australia (5.8%)$.

The correct answer is Rajkumar Singhajit Singh.

Key Points

• Guru Singhajit Singh is Known for his mastery over the dance form of Manipuri, he has distinguished himself as an outstanding performer, choreographer, scholar and artist of great creative ability.
• Rajkumar Singhajit Singh was born on 1 May 1935 in Manipur.
• He was awarded the Sangeet Natak Akademi Award in 1984 and the Padma Shri in 1986 for his contribution to the Manipuri dance.

Additional Information

• T. Balasaraswati, in full Thanjavur Balasaraswati, (born May 13, 1918, Madras [now Chennai], India died February 9, 1984, Madras).
• She was an Indian dancer and singer in the Karnatak (South Indian) tradition.
• She was one of the 20^th century’s foremost exponents of the Bharata Natyam style of classical dance.

The correct answer is 16.

Key Points

• During the lifetime of Lord Gautam Buddha, 16 great powers (Mahajanpadas) existed in the 7^th and early 6^th centuries BC.
• These were Kasi, Kosala, Anga, Magadha, Vajji, Malla, Chedi, Vatsa, Kuru, Panchala, Machcha, Surasena, Assaka, Avanti, Gandhara and Kamboja.​

​

Important Points

• Buddhist Councils marked important turning points in early Buddhism, In total, 4 major Buddhist councils were convened-

1. The First Council was held soon after the Mahaparinirvan of the Buddha, around 483 BC in the Sattapani cave at Rajgriha.
2. The second Council was held in Vaishali.
3. The third council was held in 250 BC in Patliputra.
4. The fourth Council was held in 72 AD at Kundalvana, Kashmir.

Additional Information

• Buddha was born in BC 563 in Lumbini (near the Indo-Nepal Border) and died at the age of eighty in BC 483 at Kushinagar in UP.
• At the age of 29, Gautama left home and rejected his life of riches and embraced a lifestyle of asceticism.
• After 49 consecutive days of meditation, Gautama attained enlightenment under a pipal tree (Bodhi Tree) at Bodhgaya a village in Bihar.
• Buddha gave his first sermon in the village of Sarnath in UP. This event is known as Dharma-Chakra-Pravartana.

The correct answer is Sahyadri.

Key Points

• INS Sahyadri reached the Port of Darwin, Australia to participate in exercise KAKADU 2018.
• Exercise KAKADU started in 1993, is a multilateral regional maritime engagement exercise hosted by the Royal Australian Navy and supported by the Royal Australian Air Force.
• The 14^th edition of the exercise - the participation of approx 52 foreign staff from over 25 different countries.

Additional Information

The correct answer is Axis Bank.

Key Points

• Axis bank is the third-largest private sector bank in India offering entire spectrum of financial services for personal and corporate banking.
• It sells financial services to large and mid-size companies, SMEs and retail businesses.
• Axis Bank has the largest ATM network among private banks in India.
• 'Badhti ka Naam Zindagi is the tagline of Axis bank.

​

Additional Information

The correct answer is Article 43.

Key Points

• Article 43 deals with:
• Living wages, etc for workers.
• To promote cottage industries on an individual or cooperative basis in rural areas.
• And a decent standard of living and social and cultural opportunity for all workers.
• Article 43A -
• Participation of workers in the management of industries.
• Article 43B -
• Promotion of a co-operative society.
• To promote the voluntary formation of autonomous functioning, democratic control, and professional management of a cooperative society.

 

Additional Information

Given:

Time taken by A and B = 8 days

Time taken by B and C = 12 days

Time taken by A, B and C = 6 days

Formula used:

Total work = Efficiency × time

Calculation:

Total work = (LCM of 8, 12, and 6 days)

Total work = 24 units

The efficiency of (A + B) = 24/8

⇒ 3 units/day      ----(1)

The efficiency of (B + C) = 24/12

⇒ 2 units/day      ----(2)

The efficiency of (A + B + C) = 24/6

⇒ 4 units/day      ----(3)

From equation equation (2) and (3), we get

⇒ A + 2 = 4

⇒ A = 2 units/day

From equation (1) and (3), we get

⇒ 3 + C = 4

⇒ C = 1 units/day

Now, They started together and worked for 4 days.

⇒ 4 × 4 = 16 units

Remaining work done by A and C = 24 - 16 = 8 

⇒ $\frac{8}{3}$ days

⇒ $2\frac{2}{3}$ days

∴ A and C together can complete the remaining work in $2\frac{2}{3}$ days.

Given:​

Total number of students = 80

Formula used:

Average = Sum of observation/Number of observations

Calculation:

Total number of girls = 80 × (80/100) = 64

Total number of boys = 80 - 64 = 16

Let average score of girls be x, then

According to the question,

Average score of boys = x × (120/100) = 6x/5

The average score of all the students = 78

According to the question

x × 64 + 6x/5 × 16 = 80 × 78

⇒ (64x × 5 + 6x × 16)/5 = 80 × 78

⇒ 320x + 96x = 80 × 78 × 5

⇒ 416 x = 31200

⇒ x = 31200/416 = 75

Average score of boys = 6x/5 = (6 × 75)/5 = 90

∴ Average score of boys is 90.

Given:

In first case:

Rate of interest (r) = 10% p.a.

Time (t) =  $2\dfrac{1}{2}$years 

Amount (A) = Rs. 12705

In second case:

Amount = Rs. 14500

Rate = 10%

Time = x years

Formula Used:

If a certain principal/sum be P, Rate of interest be r% and time be t year

Then, (A) = P(1 + r/100)t

SI = PRT/100

Where P = PrincipaL, R = Rate of interest, T = Time and SI = Simple interest

SI = A - P

Calculation:

In first case:

According to the question,

Let sum be Rs. P

12705 = P(1 + 10/100)^{\(2\dfrac{1}{2}\)}

⇒ 12705 = P(1 + 10/100)2 × (1 + 10/100)^{\(\dfrac{1}{2}\)}

⇒ 12705 = P × 121/100 × (1 + 10/2× 100)

⇒ 12705 = P × 121/100 × 21/20

⇒ P = 12705 × 100/121 × 20/21 = Rs. 10,000

Now,

In second case:

SI = 14500 - 10000 = Rs. 4500

SI = PRT/100

⇒ 4500 = (10000 × 10 × x)/100

⇒ x = 45/10 = $4\dfrac{1}{2}$ years.

∴ The value of x is $4\dfrac{1}{2}$ years.

Given:

Total distance of A to B = 210 km

Same direction, they meet after $10\dfrac{1}{2}$ hours

Opposite direction, 

They meet after $2\dfrac{1}{2}$ hours

Formula used:

Distance = Speed × Time

Time = Distance/Speed

Concept used:

When they are moving in the same direction, the relative speed between the two bodies is the difference of their speeds.

When they are moving in the opposite directions, the relative speed between the two bodies is the sum of their speeds.

Calculation:

Let X and Y be two cars starting from points A and B respectively.

Let the speed of car X be x km/hr and that of car Y be y km/hr.

Case I:

When two cars move in the same directions,

Suppose two cars meet at point Q. Then,

Distance travelled by car X = AQ,

Distance travelled by car Y = BQ

Two cars meet in $10\dfrac{1}{2}$ hours.

Distance travelled by car X in 21/2 hours =21x/2 km.

⇒ AQ = 21x/2

Distance travelled by car Y in 21/2 hours =21y/2 km.

⇒ BQ = 21y/2

According to the question,

AQ − BQ = AB

⇒ 21x/2 - 21y/2 = 210

⇒ 21/2 × (x - y) = 210

⇒ x - y = 20     ----(i)

Case II

When two cars move in each other(opposite) directions:

Suppose two cars meet at point P. Then,

Distance travelled by car X = AP

Distance travelled by car Y = BP

Two cars meet in $2\dfrac{1}{2}$ hours,

Distance travelled by car X in $2\dfrac{1}{2}$ hours = 5x/2 km

⇒ AP = 5x/2 km

Distance travelled by car Y in  $2\dfrac{1}{2}$ hours = 5y/2 km

⇒ BP = 5y/2 km

According to the question,

AP + BP = AB

⇒ 5x/2 + 5y/2 = 210

⇒ 5/2 × (x + y) = 210

⇒ x + y = 84     ----(ii)

Adding equations (i) and (ii), we get

⇒ x - y + x + y = 20 + 84

⇒ 2x = 104

⇒ x = 104/2 = 52 km/h

Putting the value of x in (i), we get, 

⇒ x - y = 20

⇒ 52 - y = 20

⇒ y = 32 km/hr

Difference between their speeds = (52 - 32) km/hr = 20 km/hr

∴ The difference between their speeds (in km / h) is 20 km/hr.

Given:

30% of A's income = 20% of B's income

15% of B's income = 25% of C's income

C's income = Rs. 54000 

Calculation:

30% × A = 20% × B 

⇒ A : B = 2 : 3       ----(i)

15% × B = 25% × C

⇒ B : C = 5 : 3       ----(ii)

From (i) and (ii)

A : B : C = 10 : 15 : 9

Let the income of A, B and C be Rs. 10x, 15x and 9x respectively,

According to the question,

⇒ 9x = Rs. 54000

⇒ x = Rs. 6000

The income of A = 10x = 10 × 6000 = Rs. 60000

The income of B = 15x = 15 × 6000 = Rs. 90000

∴ The total income of A and B = Rs. (60000 + 90000) = Rs. 150000.

Shortcut Trick

Equate the volumes: Volume of Cone = Volume of Sphere.

Height (h) = 2.1 cm, Base Diameter = 4h ⇒ Radius (r) = 2h = 4.2 cm.

(1/3)πr²h = (4/3)πR³ ⇒ (4.2)² × 2.1 = 4R³.

R³ = (2.1 × 2)² × 2.1 ÷ 4 = 4 × (2.1)³ ÷ 4 = (2.1)³ ⇒ R = 2.1 cm.

Surface Area = 4πR² = 4 × π × (2.1)² = 4 × 4.41π = 17.64π cm².

∴ The correct answer is 17.64π cm².

Alternate Method

Given: Height of cone (h) = 2.1 cm. Diameter = 4 × 2.1 = 8.4 cm. Radius of cone (r) = 4.2 cm.

Formula Used: Volume of cone = (1/3)πr²h; Volume of sphere = (4/3)πR³; Surface area of sphere = 4πR².

⇒ Volume of Sphere = Volume of Cone

⇒ (4/3) × π × R³ = (1/3) × π × (4.2)² × 2.1

⇒ 4 × R³ = 4.2 × 4.2 × 2.1

⇒ 4 × R³ = (2 × 2.1) × (2 × 2.1) × 2.1

⇒ 4 × R³ = 4 × (2.1)³

⇒ R³ = (2.1)³ ⇒ R = 2.1 cm

⇒ Surface Area of Sphere = 4 × π × R²

⇒ Surface Area = 4 × π × (2.1)² = 4 × 4.41 × π

⇒ Surface Area = 17.64π

∴ The correct answer is 17.64π cm².

Additional Information

Recasting Rule

When a solid is melted and recast into another shape, the volume remains constant (Volume_initial = Volume_final).

Sphere Properties

For a sphere of radius R, the Volume is (4/3)πR³ and the Total Surface Area is 4πR².

Cone Properties

For a cone of radius r and height h, the Volume is (1/3)πr²h and the Slant Height l = √(r² + h²).

Given:

A = B + 20% of B 

B = C - 20% of C

D = A + 50% of A

Calculation:

According to the question,

A = B + 20% of B 

⇒ A = B + ${1\over 5}B$

⇒ A = ${6\over 5}B$      ----(1)

B = C - 20% of C

⇒ B = C -  ${1\over 5}C$

B = ${4\over 5}C$      ----(2)

D = A + 50% of A

⇒ D = A + ${1\over 2}A$

D = ${3\over 2}A$     ----(3)

Substituting value of eq(1) in eq(3), we get

D = ${3\over 2}× {6\over 5}B$

⇒ D = ${18\over 10}B$

⇒ D/B = ${18\over 10}$ = ${9\over 5}$

According to the option,

B = (5 × 100)/9 = 500/9%

∴ B is $55\dfrac{5}{9}\%$ of D.

Given:

In first case:

Rate of interest (r) = $16\dfrac{2}{3}\%$ = 50/3%

Time (t) = 3 years

CI = Rs. 635, Where CI = Compound interest

In second case:

Rate = $16\dfrac{2}{3}\%$

Time = 3 × 2 years = 6 years (The same rate for double the time)

Formula Used: 

If a certain principal/sum be P, Rate of interest be r% and time be t year

Then, CI = P{(1 + r/100)t - 1}

SI = PRT/100

Where P = Principal, R = Rate of interest, T = Time and SI = Simple interest

SI = A - P

Calculation:

In first case:

CI = P{(1 + r/100)t - 1}

⇒ 635 = P{(1+ 50/300)³ - 1}

⇒ 635 = P{(7/6)³ - 1}

⇒ 635 = P(343/216 - 1)

⇒ 635 = P × 127/216 

P = (635 × 216)/127

P = Rs. 1080

In second case:

SI = PRT/100

 SI = (1080 × (50/3) × 6)/100

SI = (1080 × 50 × 6)/(100 × 3)

SI = Rs. 1080

∴ The simple interest on the same sum at the same rate for double the time is Rs. 1080.

Given:

A certain number of persons can do a piece of work in 40 days

Formula used:

M1D1 = M2D2

Where,

M1 = Men1 , D1 = Days1 

M2 = Men2 , D2 = Days2 

Calculation:

Let be the x persons were employed to do the work initially,

If 45 persons more = (x + 45)

According to the question,

M1D1 = M2D2

⇒ x × 40 = (x + 45) × 25

⇒ x × 40 = 25x + 1125

⇒ 15x = 1125

⇒ x = 75

∴ 75 persons were employed to do the work initially.

Given:

Mean proportional between 162 and 128 = x

Third proportional between 32 and 72 = y

Formula:

If mean proportional between a and b be x, then x = √ab

Calculation:

If x is the mean proportional between 162 and 128

162 ∶ x ∶∶ x ∶ 128

⇒ 162/x = x/128

⇒ x2 = 162 × 128

⇒ x = √(162 × 128) 

⇒ x = √(2 × 2 × 81 × 64) = 144

If y is the third proportional between 32 and 72, then

32 : 72 : : 72 : y

⇒ 32/72 = 72/y

⇒ y = 162

Now, x : y = 144 : 162 = 8 : 9

∴ The value of x : y is 8 : 9

Additional Information

If x is the mean proportional between a and b, then x = √ab

Given:

The ratio of incomes of A, B and C are in the ratio 6 : 8 : 5 

Their expenditures are in the ratio 5 : 7 : 4

C saves 40% of her income,

Formula used:

Income = Expenditure + Savings

Calculation:

Let income be 'x' & expenditure be 'y' 

⇒ C's income (5x) = 4y + Savings

C’s saving = (40/100) × 5x = 2x

⇒ C’s income = 4y + Savings

⇒ 5x = 4y + 2x

⇒ 3x = 4y

⇒ x = 4y/3

⇒ A’s savings = Income – Expenditure = 6x - 5y = 6 × 4y/3 - 5y = 3y

⇒ B’s savings = Income - Expenditure = 8x - 7y = 8 × 4y/3 - 7y = 11y/3

⇒ C’s saving = 2x = 2 × 4y/3 = 8y/3

∴ Ratio of savings of A, B and C = 3y : 11y/3 : 8y/3 = 9 : 11 : 8.

Shortcut Trick 

Concept Used:

Follow the BODMAS rule according to the table given below:

Calculation:

$\dfrac{3\dfrac{2}{3}\div\dfrac{11}{30}:of:\dfrac{2}{3}-\dfrac{1}{4}:of:2\dfrac{1}{2}\div\dfrac{3}{5}×4\dfrac{4}{5}}{\left(\dfrac{3}{4}+\dfrac{3}{5}\right):of:\left(\dfrac{5}{6}-\dfrac{5}{7}\right)×\left(\dfrac{7}{8}-\dfrac{7}{9}\right):of:5\dfrac{1}{3}}$

⇒ $\dfrac{\dfrac{11}{3}\div\dfrac{11}{30}:of:\dfrac{2}{3}-\dfrac{1}{4}:of:\dfrac{5}{2}\div\dfrac{3}{5}×\dfrac{24}{5}}{\left(\dfrac{3}{4}+\dfrac{3}{5}\right):of:\left(\dfrac{5}{6}-\dfrac{5}{7}\right)×\left(\dfrac{7}{8}-\dfrac{7}{9}\right):of:\dfrac{16}{3}}$

⇒ $\dfrac{\dfrac{11}{3}\div\dfrac{11}{45}-\dfrac{5}{8}\div\dfrac{3}{5}×\dfrac{24}{5}}{\dfrac{(15+12) }{20}of\dfrac{(35- 30)}{42}×\dfrac{(63 - 56)}{72}of:\dfrac{16}{3}}$

⇒ $\dfrac{\dfrac{11}{3}× \dfrac{45}{11}-\dfrac{5}{8}× \dfrac{5}{3}×\dfrac{24}{5}}{\dfrac{27 }{20}of\dfrac{5}{42}×\dfrac{7}{72}of:\dfrac{16}{3}}$

⇒  $\dfrac{\dfrac{11}{3}× \dfrac{45}{11}-\dfrac{5}{8}× \dfrac{5}{3}×\dfrac{24}{5}}{\dfrac{27 }{20}of\dfrac{5}{42}×\dfrac{7}{72}of:\dfrac{16}{3}}$

⇒ $\dfrac{(15-5)}{\dfrac{1 }{12}}$

⇒ 10 × 12 = 120

∴ The value of $\dfrac{3\dfrac{2}{3}\div\dfrac{11}{30}:of:\dfrac{2}{3}-\dfrac{1}{4}:of:2\dfrac{1}{2}\div\dfrac{3}{5}×4\dfrac{4}{5}}{\left(\dfrac{3}{4}+\dfrac{3}{5}\right):of:\left(\dfrac{5}{6}-\dfrac{5}{7}\right)×\left(\dfrac{7}{8}-\dfrac{7}{9}\right):of:5\dfrac{1}{3}}$ is 120.

Given:

Selling Price = Rs. 1596

Discount = 5%

Formula used:

S.P. = M.P.(1− discount%/100)

CP = [(S.P × 100)/(100 + Profit %)]

Where M.P = marked price and C.P = cost price and S.P = selling price

Calculation:

According to the question,

S.P. = M.P.(1− discount%/100)

⇒ 1596 = MP(1 - 5/100)

⇒ 1596 = MP × 95/100

⇒ MP = (1596 × 100)/95 = Rs. 1680

According to the question,

if there was no discount, S.P.= Rs. 1680 and Profit = 12%

C.P.= [(S.P × 100)/(100 + Profit %)]

⇒ CP = (1680 × 100)/112 = Rs. 1500

∴ The cost price of each article is Rs. 1500.

Given:

Triangular park where sides are 410 m, 280 m and 150 m 

Formula used:

Perimeter of circle = 2πr

Area of triangle = $√{s(s − a)(s − b)(s − c)}$

s = (a + b + c)/2​

Where, s = semi perimeter

Area of circle = πr²

Calculation:

Semi perimeter of triangular park = (150 + 280 + 410)/2 = 420 m

Area of triangular park = $√{s(s − a)(s − b)(s − c)}$

⇒ A = $√{420(420 − 410)(420 − 280)(420 − 150)}$

⇒ A = $√{420× 10 × 140 × 270}$

⇒ A = √(158760000) = 12600 m²

According to the question,

The area of circular park = 11 × (the area of a triangular park)

⇒ πr2 = 11 × 12600

⇒ 22/7 × r2 = 11 × 12600

⇒ r2 = (11 × 12600 × 7)/22 = 6300 × 7

⇒ r2 = 44100

⇒ r = √44100 = 210 m

Perimeter of the circular park = 2πr

⇒ 2 × 22/7 × 210 = 1320 m

∴ The perimeter of the circular park is 1320 m.

Concept Used:

Follow the BODMAS rule according to the table given below:

Calculation:

$\dfrac{{\left[ {9.5 ÷ \left( {0.6 \times 0.75 + 0.8 ÷ 16} \right) + 0.75} \right] ÷ 31.6}}{{2.32 ÷ \left[ {1.4 ÷ 0.5;ofo.7 + 2.4;of;1.6 ÷ 8;of;0.75} \right]}}$

⇒ $\dfrac{{\left[ {9.5 ÷ \left( {0.6 \times 0.75 + 0.05} \right) + 0.75} \right] ÷ 31.6}}{{2.32 ÷ \left[ {1.4 ÷ 0.35+ 3.84 ÷ 6} \right]}}$

⇒ $\dfrac{{\left[ {9.5 ÷ \left( {0.45 + 0.05} \right) + 0.75} \right] ÷ 31.6}}{{2.32 ÷ \left[ {4+ 0.64} \right]}}$

⇒ (9.5 ÷ 0.5 + 0.75) ÷ 31.6/(2.32 ÷ 4.64)

⇒ (19 + 0.75) ÷ 31.6/0.5

⇒ (19.75 ÷ 31.6)/0.5

⇒ 0.625/0.5 = 1.25

∴ The value of $\dfrac{{\left[ {9.5 \div \left( {0.6 \times 0.75 + 0.8 \div 16} \right) + 0.75} \right] \div 31.6}}{{2.32 \div \left[ {1.4 \div 0.5;ofo.7 + 2.4;of;1.6 \div 8;of;0.75} \right]}}$ is 1.25.

Given:

Speed of the stream = 2 km/h

Distance in upstream = 10 km

Distance in Downstream = 10 km

Time taken = 55 minutes

Concept used:

Upstream speed = (Speed of the boat) - (Speed of the stream)

Downstream speed = (Speed of the boat) + (Speed of the stream)

Time = Distance/Speed 

Calculation:

Let the speed of the motor boat in still water be x kmph

Speed downstream = (x + 2) kmph

Speed upstream = (x - 2) kmph

According to the question,

10/(x + 2) + 10/(x - 2) = 55/60

⇒ 10[1/(x + 2) + 1/(x - 2)] = 55/60

⇒ [(x + 2 + x - 2)/(x + 2)(x - 2)] = 11/120

⇒ 11x² - 240x - 44 = 0

⇒ (x - 22)(11x + 2) = 0

⇒ x = 22 or, x = -2/11

Speed of motor boat in still water = 22 kmph

Time = 127.6/22 = 5.8 hour

∴ Required time is 5.8 hour.

Given:

$x=\dfrac{5√3-√{48}-4√2+√{50}}{3+√6}:and:y=√{7-4√3}$

Formula used:

(a - b)² = a² + b² - 2ab

a² - b² = (a + b)(a - b)

Calculation:

$x=\dfrac{5√3-√{48}-4√2+√{50}}{3+√6}:and:y=√{7-4√3}$

⇒ $x=\dfrac{5√3-4√{3}-4√2+5√{2}}{3+√6}:and:y=√{(√ 3)^2 + (2)^2-2 × 2 × √3}$

⇒ x = (√3 + √2)/(3 + √6) and y =   2 - √3

⇒ x = (√3 + √2)(3 -√6)/(3 + √6)(3 - √6)

⇒ x = [√3 + √2 - 6 + 3√3 - 2√6 + 3√2]/[(3)² - (√6)²]

⇒ x = √3/3

According to the question,

x - y = [(√3/3) - (2 - √3)]

⇒ x - y = (1 - 2√3 + 3)/√3

⇒ x - y = (4 - 2√3)/√3 = (4 - 2 × 1.73)/1.73

⇒ x - y = (4 - 3.46)/1.73 = 0.54/1.73 = 0.31 = 0.3 (approx)

∴  The value of (x - y) is closest to 0.3.

Calculation:

Let the two numbers be a and b

The table shows that when b is divided by a, quotient is 2 and remainder is c, which become divisor in 2^nd step and b becomes dividend, now quotient is 2 and remainder is d, which become

.3^rd step and c become dividend, now quotient is d and remainder is 59, and in the final step, 59 become divisor with d being the dividend, 3 is quotient and remainder is 0.

Now,

d = 59 × 3 + 0 = 177      ----(1)

c = 2 × d + 59

From equation(1):

⇒ c = 2 × 177 + 59 = 413    ----(2)

b = 2 × c  + d

From equation(1) and equation(2);

b = 2 × 413 + 177 = 1003     ----(3)

a = 2 × b + c

From equation(2) and equation(3);

a = 2 × b + c

⇒ a = 2 × 1003 + 413 = 2419

The sum of numbers = (a - b) = (2419 - 10003) = 1416

∴ The difference of the two numbers is 1416.

Given:

Number of students:

Calculation:

Total number of girls qualified in examination from school B in six years = 2310

Total numbers of students qualified from A in six years = 4350

Let total number of girls qualified in the examination from school B in six years be x% of the total numbers of students qualified from A in six years.

Therefore,

2310 = x% of 4350

x = 231000/4350

x = 53.10%

Hence, the correct answer is 53%(nearest to an integer.)

Given:

 

Calculation:

 

 

∴ Required ratio = 1290 : 660 = 43 : 22.

The correct answer is 'Inattentive'.

Key Points

• Let's explore the meaning of the marked word and the given word.
• Vigilant: giving careful attention to what is happening, so that you will notice any danger or illegal activity
• Example: Please remain vigilant at all times and report anything suspicious.
• ​Inattentive: not giving enough attention to someone or something
• Example: Roger was hyperactive and inattentive as a child.
• Thus, from above we can conclude that the correct answer is option 4.

Additional Information

• Let's explore the given options:

The correct answer is 'Sericulture'.

Key Points

• Sericulture: the production of silk and the rearing of silkworms for this purpose.
• Example: It was in fact not till after the twelfth century that sericulture began to spread throughout Europe.
• Thus, the correct answer is option 1.

Additional Information

• Let's explore the option:

The correct answer is 'have been successfully repelled'.

Key Points

• The given sentence is an example of the passive structure of the present perfect tense.
• Present perfect tense: It is described as an action started in past, finished in past, but has a relation with the present.
• Structure:
• Subject+have/has+ the third form of verb. (Active voice)
• Object+ has/have+been+ the third form of verb+ by subject. (Passive voice)
• Example: 
• Active: She has cooked the food.
• Passive: The food has been cooked by her.
• Thus, 'have been successfully repelled' will be used in the blank.

Therefore, the correct answer is: 'The enemy forces have been successfully repelled by our army.'