SSC CGL 2020 Tier-I Official Paper (Held On : 16 Aug 2021 Shift 2) (Previous Year Paper)

Given: Raj Ghat : Mahatma Gandhi

The logic follows here is:

Raj Ghat is a memorial dedicated to Mahatma Gandhi Ji.

Similarly,

Vijay Ghat is the memorial of India's second Prime Minister Lal Bahadur Shastri.

Important Points

Hence, Vijay Ghat : Lal Bahadur Shastri is the correct answer.

The least possible Venn diagram is:

Conclusions:

I. Some pen drives are not laptops → False (because all pen drives can be laptops as there is no direct relationship between these two)

II. No keyboard is a computer → False (it is possible as shown but is not definite as there is no direct relation)

III. No hard disk is a laptop → False (because all hard disks can be laptop as there is no direct relationship between these two)

IV. All pen drives are not keyboards → True (as no pen drive is keyboard implies all pen drives are not keyboards)

Hence, only conclusion IV follows.

Additional Information

He (Rajat) is the only son of my (Ajay) father's daughter-in law, implies two conditions:

(1) If Ajay is the only son of his father, then the family tree is:

Then, Ajay is the father of Rajat.

(2) If Ajay has a brother, then the family tree is:

Then, Ajay is the uncle of Rajat.

Hence, either father or uncle.

Given: 

Logic: If two dice have same face value in given image than their clockwise or anticlockwise wise number are know as opposite numbers in dice.

While moving in clockwise direction from common face (WE):

From the both dices:

Thus, GO is opposite to TO.

Hence, GO is the correct answer.

The logic following here is: Column wise,

(2 × 2^nd number) - (1^st number - 2^nd number) = 3^rd number

Column 1 → 2 × 18 - (22 - 18) = 36 - 4 = 32,

Column 2 → 2 × 24 - (32 - 24) = 48 - 8 = 40,

Similarly,

Column 3 → 2 × 5 - (7 - 5) = 10 - 2 = 8

Hence, 8 is the correct answer.

Given: B, E, G, J, L, ?

Logic: Alternate adding 3 and 2 to the positional value as shown below:

Hence, O is the correct answer.

The logic follow here is:

Hence, option (1) is the correct answer. 

Additional Information

In a mirror image Left changes to right and the right changes to left vice-versa.

When placement of mirror not given, By default we will assume it in Vertical direction on the right side.

The Letter adjacent to the mirror after the mirror image will adjacent to it just with the left change to right and right change to left vice-versa.

The starting letter of the word will be at last after the mirror image drawn with left changes to right and right changes to left.

Given: GCB, JHE, MMH, PRK, ?

The logic follow here is:

Hence, SWN is the correct answer.

The logic follow here is:

All the words except prowl are sounds.

By checking options:

(1) Yowl → make a loud wailing cry.

(2) Prowl → an act of (of a person or animal) moving about restlessly and stealthily, especially in search of prey.

(3) Growl → (of a thing) make a low or harsh rumbling sound.

(4) Howl → weep and cry out loudly.

Hence, prowl is the odd one out.

Given: 15 : 135 :: 16 : ? :: 18 : 189

The logic follows here is:

15 : 135 → [(15 + 3) × 15] ÷ 2 = [18 × 15] ÷ 2 = 9 × 15 = 135

18 : 189 → [(18 + 3) × 18] ÷ 2 = 21 × 9 = 189

Similarly,

16 : ? → [(16 + 3) × 16] ÷ 2 = 19 × 8 = 152

⇒ ? = 152

Hence, 152 is the correct answer.

Given: 5, 13, 22, 34, 51, 75, 108, 152, ?

The logic follow here is:

Hence, 209 is the correct answer.

By checking options:

(1) 324 : 64 → $\sqrt{324} = 18 \to 1 + 8 = 9 \to 9^2 = 81 \neq 64$

(2) 169 : 16 → $\sqrt{169} = 13 \to 1 + 3 = 4 \to 4^2 = 16$

(3) 289 : 64 → $\sqrt{289} = 17 \to 1 + 7 = 8 \to 8^2 = 64$

(4) 256 : 49 → $\sqrt{256} = 16 \to 1 + 6 = 7 \to 7^2 = 49$

Hence, 324 : 64 is the odd one out.

Arranging all the words as per their order in the dictionary:

(1) Umbilical

(4) Umbrella

(3) Unaltered

(5) Unanimous

(2) Urgent

Hence, 1, 4, 3, 5, 2 is the correct answer.

Given: 

The logic follow is: The above given image is hidden as follow:

Hence, option (1) is the correct answer.

The logic follow here is:

(1) Arrow → rotating 45° in clockwise direction and with changing upside down in each step.

(2) Pendulum like shape → rotating in anticlockwise direction alternatively, first 90° and then 45° in next step.

Answer figure should have arrow rotated 45° in clockwise direction and pendulum should be rotated 90° anticlockwise.

Therefore, the complete series is:

Hence, option (4) is the correct answer.

Number of squares in the given figure are shown below:

Hence, the correct answer is "7".

Given: Whisk, Utensil, Sickle.

The logic follow here is: All whisk are utensil but no relation between sickle and utensil, thus:

Important PointsWhisk means a utensil for whipping eggs or cream.

Sickle means  a short-handled farming tool with a semicircular blade, used for cutting corn, lopping, trimming.

Hence, option (2) is the correct answer.

The logic follow here is:

Column wise,

1^st number × (2^nd number + 1) + 2^nd number = 3^rd number.

Column 1 → 6 × (8 + 1) + 8 = 6 × 9 + 8 = 54 + 8 = 62

Column 2 → 11 × (3 + 1) + 3 = 11 × 4 + 3 = 44 + 3 = 47

Similarly,

Column 3 → 14 × (? + 1) + ? = 89

14 × ? + 14 + ? = 89

15 × ? + 14 = 89

15 × ? = 75

? = 75 ÷ 15

? = 5

Hence, 5 is the correct answer.

Alternate Method(First Number × Second Number) + (First Number + Second Number) = Third Number

Column 1: ( 6 × 8) + (6 + 8) = 62

Column 2: ( 11 × 3) + (11 + 3) = 47

Similarly,

Column 3: ( 14 × 5) + (14 + 5) = 89.

Given: 6 * 10 * 55 * 162 * 9 = 23

By checking options and interchanging accordingly:

(1) ×, −, +, ÷

LHS = 6 × 10 - 55 + 162 ÷ 9

= 60 - 55 + 18 

= 78 - 55

= 23

= RHS

(2) ÷, +, ×, −

LHS = 6 ÷ 10 + 55 × 162 - 9

= 0.6 + 8910 - 9

= 8901.6

≠ 23

≠ RHS

(3) ×, ÷, −, +

LHS = 6 × 10 ÷ 55 - 162 + 9 

= 1.09 - 162 + 9

= 10.09 - 162

= - 151.91

≠ 23

≠ RHS

(4) +, −, ÷, ×

LHS = 6 + 10 - 55 ÷ 162 × 9

= 6 + 10 - 3.05

= 16 - 3.05

= 12.95

≠ 23

≠ RHS

Hence, ×, −, +, ÷ is the correct answer.

The logic follow here is: Sum of positional values.

By checking options:

(1) BTGN:

(2) FJQL:

(3) EMNK:

(4) IDWG:

Therefore, the sum of positional values of letters of all option is 43 except FJQL.

Hence, FJQL is the odd one out.

Given: ‘ALPINE’ is coded as ‘171’ and ‘SPRING’ is coded as ‘83’. 

The logic follow here is: Addition of place value of given Letter × number of Vowel

Now, number of vowels = 3

= 57 × 3

= 171

And,

Now, number of vowels = 1

= 83 × 1

= 83

Similarly,

Now, number of vowels = 3

= 62 × 3

= 186

Hence, 186 is the correct answer.

Given: Chicken : Flock :: Bear : ?

The logic follow here is: 

The group of Chicken is known as Flock.

Similarly,

The group of bears is known as Sloth.

Important Points(1) Clutter → cover or fill (something) with an untidy collection of things.

(2) Drove → a herd or flock of animals being driven in a body.

(3) Ambush → make a surprise attack on (someone) from a concealed position.

Hence, sloth is the correct answer.

(1) The present age of a father is three times that of his elder son.

Let the present age of father be F and that of elder son's be E, then:

F = 3 × E

(2) Four years hence, the age of the father will be four times that of his younger son.

Let the present age of younger son be Y, then:

F + 4 = 4 × (Y + 4)

(3) If the difference between the present ages of the elder and younger child is 6 years, then:

E - Y = 6 ⇒ E = Y + 6, 

From above three statements,

⇒ F = 3Y + 18 (from (1) and (3))

⇒ Y = (F - 18) ÷ 3

Now, substituting Y in (2)

⇒ $F + 4 = 4 × [{(F - 18) \over 3} + 4]$

⇒ ${F\over 4} + 1= {F \over 3} - 6 + 4$

⇒ ${F \over 3} - {F\over 4} = 3$

⇒ F = 3 × 12

⇒ F = 36

Hence, the present age of father is 36 years.

The logic follow here is:

The paper when unfolded, will look like: 

Hence, option (2) is the correct answer.

Given: 'MORBID' is written as 'FKDTQO'.

The logic follow here is:

Similarly, 

Hence, PKCVDQ is the correct answer.

The correct answer is Jhumpa Lahiri.

• Jhumpa Lahiri is the author of the book ‘Interpreter of Maladies’.

Key Points

• Interpreter of Maladies
• It is a book collection of nine short stories.
• The stories are about the lives of Indians and Indian Americans who are caught between their roots and the "New World".
• It was published in 1999.
• Jhumpa Lahiri won the Pulitzer Prize for Fiction and the Hemingway Foundation/PEN Award in the year 2000 for this book.
• Jhumpa Lahiri
• She is an Indian-origin American author.
• She has been a professor of creative writing at Princeton University since 2015.
• Other books/novels written by her- The Namesake, The Lowland, Whereabouts, The Clothing of Books, etc.

Additional Information

• Books/Novels by Sudha Murty- Mahashweta, Dollar Bahu, The Old Man and his God, etc.
• Books/Novels by Anita Nair- Cut like Wound, Malabar mind, Mistress, etc.
• Books/Novels by Arundhati Roy- The God of small things, My Seditious heart, The Ministry of Utmost Happiness, etc.

The correct answer is Sarvepalli Radhakrishnan.

Key Points

• Sarvepalli Radhakrishnan was the first Vice President of India.
• Part V of the Constitution of India includes the office of the Vice-President of India.
• Zakir Hussain served as the third president of India.
• Gopal Swarup Pathak was the fourth vice president of India.
• Varahagiri Venkata Giri was the fourth president of India. He was the only president to be elected as an independent candidate.

Important Points 

The correct answer is core inflation.

Key Points

• The core inflation rate measures rising prices in everything except food and energy.
• The prime rate does not include food and energy prices because they vary greatly each month.
• This exclusion makes the main rate more accurate than the headline inflation rate in measuring underlying inflationary trends.
• Headline inflation is the total inflation in an economy. The headline inflation figure includes inflation in a basket of goods that includes items such as food and energy.

Additional Information

• Stagflation is characterized by slow economic growth and relatively high unemployment. It is caused by cost-push inflation.
• Wage inflation is an increase in nominal wages which means workers receive higher pay and that tends to cause price inflation.
• Deflation is when consumer and asset prices decrease over time, and purchasing power increases.

The correct answer is Brahmani.

Key Points

• ​The Brahmani River is formed by the confluence of the Shankh River and the South Koel River at Vedavyas in Odisha.
• It flows through the districts of Sundargarh, Deogarh, Angul, Dhenkanal, Cuttack, Jajapur and Kendrapara.
• It forms a large delta with the Baitarani River before emptying into the Bay of Bengal at Dhamra.

Additional Information

• The Penna river rises in the Nandi Hills in Chikkaballapur District of Karnataka state.
• Subarnarekha river originates near piska/nagri, near Ranchi, Jharkhand. It states of Jharkhand, West Bengal and Odisha.
• Sabarmati river originates in the Aravalli Range of the Udaipur District of Rajasthan. It flows through Rajasthan and Gujarat.

The correct answer is 7.

Key Points

• Padma Vibhushan 2021 Awardees-

1. Shri Shinzo Abe - Public Affairs - Japan
2. Shri S P Balasubramaniam (Posthumous) - Art - Tamil Nadu
3. Dr. Belle Monappa Hegde -  Medicine - Karnataka
4. Shri Narinder Singh Kapany (Posthumous) - Science and Engineering - United States of America
5. Maulana Wahiduddin Khan - Others - Spiritualism - Delhi
6. Shri B. B. Lal Others - Archaeology - Delhi
7. Shri Sudarshan Sahoo - Art - Odisha​

Additional Information 

• Padma Awards - One of the highest civilian awards of the country, are awarded in three categories, namely Padma Vibhushan, Padma Bhushan and Padma Shri.
• The awards are given in various disciplines/areas of activities, such as- arts, social work, public affairs, science and engineering, trade and industry, medicine, literature and education, sports, civil service, etc.
• The 'Padma Vibhushan' is given for exceptional and distinguished service.
• 'Padma Bhushan' for distinguished service of a high order.
• 'Padma Shri' for distinguished service in any field.
• These awards are announced every year on the occasion of Republic Day.

The correct answer is Chlorophyceae.

Key Points

• Algae are a diverse group of aquatic organisms that have the ability to perform photosynthesis.
• Green algae are members of the Chlorophyta division.
• These are organisms characterized by having chlorophyll a and b as the major photosynthetic pigments.
• Chlorophyceae are also called 'green algae'.
• Most chlorophytes have one or more storage bodies called pyrenoids that are localized around the chloroplast.

Additional Information 

• Porphyridium cruantum is a species of red algae. It is rich in polysaccharides, which help retain moisture and hydrate the skin.
• Rhodophyceae are commonly known as red algae, because they contain the water-soluble red pigment, R-phycoerythrin. Over 98% of the members are marine and the remainder grows in freshwater.
• Phaeophyceae are brown algae. They live in marine environments, where they play an important role as both food and potential habitat.

The correct answer is Canada.

• Canada is not part of the Quad Group.
• The Quad, officially the Quadrilateral Security Dialogue, is a grouping of four countries: the United States, Australia, India and Japan.

Additional Information

• The dialogue was initiated in 2007 by Japanese Prime Minister Shinzo Abe with the support of then US Vice President Dick Cheney, then Australian Prime Minister John Howard and then Indian Prime Minister Manmohan Singh.
• The initiative was widely seen as a response to increasing Chinese economic and military power.
• Later, Australia withdrew from the group over rising tensions between the United States and China in the Asia-Pacific.
• During the 2017 ASEAN summit in Manila, all prime ministers of the former countries agreed to revive the Quadrilateral Alliance to counter China militarily and diplomatically in the South China Sea.

The correct answer is 1891.

Key Points

• The Indian Age of Consent Act was legislation enacted in British India on 19 March 1891 that raised the age of consent for sexual intercourse from ten to twelve years for all girls in all jurisdictions.
• The Act was also known as Act X of 1891.
• It was an amendment to the Indian Penal Code and the Code of Criminal Procedure, Section 375, 1882.
• Parishad member Sir Romesh Chunder Mitter (from Bengal) opposed it on the grounds that it interfered with the orthodox Hindu code.
• However, it received support from Indian reformers such as Behramji Malabari and women's social organizations.

The correct answer is A good that is consumed by a single person or household.

Key Points

• A good that is consumed by a single person or household is a private good. 
• A public good is a product that one individual can consume without reducing its availability to others and from which no one is excluded.
• A private good is the opposite of a public good.
• A private good is a product that must be purchased to be consumed, and consumption by one individual prevents another individual from consuming it.
• We encounter private goods every day. For example- dinner at a restaurant, grocery shopping, airplane rides, and cellphones.
• Any item that is effectively destroyed or rendered unusable for its original purpose through use, such as food and toilet paper, are also private good.

The correct answer is 11.

Key Points

• Of the known elements in the periodic table, only 11 are gases under normal atmospheric conditions.
• These gases are hydrogen, nitrogen, oxygen, fluorine, chlorine, helium, neon, argon, krypton, xenon and radon.
• The periodic table is managed by the International Union of Pure and Applied Chemistry, or IUPAC.
• The modern periodic table sorts the elements according to increasing atomic number instead of increasing atomic mass.
• There are 118 elements in a periodic table.
• There are seven periods and eighteen groups in the modern periodic table.

Additional Information

• The size of the atoms (atomic size) decreases as we move from left to right in a period.
• The metallic properties of elements decrease while the non-metallic properties increase as we move from left to right in a period.
• Atoms increase in size (or increase in atomic size) as you move down a group of the periodic table.
• The metallic properties of elements increase as we move down the group of the periodic table.

The correct answer is Mycology.

Key Points

• Mycology is a branch of biology that studies fungi.
• Fungi are unicellular or multicellular thick-cell-walled heterotroph decomposers that eat decaying matter and form tangles of fibers.
• They use complex organic compounds as a source of energy and carbon, not photosynthesis.
• They are found in almost any habitat, but live mostly on land, primarily on soil or plant material rather than in sea or freshwater.
• A small number of fungi cause diseases in animals.
• In humans, fungal diseases include skin diseases such as athlete's foot, ringworm, and thrush.

Additional Information

• Morphology is the branch of biology that deals with the form of living organisms, and with relationships between their structures.
• Kalology is the branch of philosophy dealing with taste and the study of beauty in nature and art.
• Virology is the scientific discipline concerned with the study of the biology of viruses and viral diseases.

The correct answer is Sofia Kenin.

Key Points

• Sofia Kenin was the Australian Open 2020 women's singles winner.
• The 2020 Australian Open was a Grand Slam tennis tournament that took place at Melbourne Park from 20 January to 2 February 2020.
• It was the 108^th edition of the Australian Open.
• This included tennis competitions for professional players in singles, doubles, and mixed doubles.

Important Points

• 2020 Australian Open:
• Men's singles winner- Novak Djokovic
• Men's Doubles winner- Rajeev Ram and Joe Salisbury
• Women's Doubles winner- Tímea Babos and Kristina Mladenovic

The correct answer is Assam.

Key Points

• Borail Wildlife Sanctuary is in the Cachar district of Assam.
• The sanctuary includes North Cachar Reserve Forest and Barel Reserve Forest.
• It is famous for tropical moist evergreen and semi-evergreen forests.

Additional Information

Wildlife Sanctuaries:

The correct answer is Speaker of the Lok Sabha.

• Speaker of the Lok Sabha is the ex-officio President of the Indian Parliamentary Group (IPG).

Additional Information

• Indian Parliamentary Group
• It is an autonomous body whose membership is open to all current or former members of the Indian Parliament.
• It was established in 1949 after a resolution adopted by the Constituent Assembly on 16 August 1948.
• The objective of the group is to promote personal contacts between Members of Parliament and to disseminate information to Members of Parliament by organizing seminars etc. on possible issues before the Parliament.
• It arranges lectures on political, defence, economic, social and educational problems and also arranges foreign visits with a view to develop contacts with the members of other parliaments.
• The group acts as a link between the Parliament of India and the various Parliaments of the world by exchange of delegations, goodwill missions, correspondence, documents etc. with foreign parliaments.
• It also serves as
• (a) the national grouping of the Inter-Parliamentary Union and
• (b) the main branch of the Commonwealth Parliamentary Association in India.

The correct answer is Japan.

Key Points

• Padma Vibhushan 2021 Awardees-
• Shri Shinzo Abe - Public Affairs - Japan
• Shri S P Balasubramaniam (Posthumous) - Art - Tamil Nadu
• Dr. Belle Monappa Hegde -  Medicine - Karnataka
• Shri Narinder Singh Kapany (Posthumous) - Science and Engineering - United States of America
• Maulana Wahiduddin Khan - Others - Spiritualism - Delhi
• Shri B. B. Lal Others - Archaeology - Delhi
• Shri Sudarshan Sahoo - Art - Odisha​

Additional Information 

• Padma Awards - one of the highest civilian awards of the country, are awarded in three categories, namely Padma Vibhushan, Padma Bhushan and Padma Shri.
• The awards are given in various disciplines/areas of activities, such as- arts, social work, public affairs, science and engineering, trade and industry, medicine, literature and education, sports, civil service, etc.
• The 'Padma Vibhushan' is given for exceptional and distinguished service.
• 'Padma Bhushan' for distinguished service of a high order.
• 'Padma Shri' for distinguished service in any field.
• These awards are announced every year on the occasion of Republic Day.

The correct answer is Iltutmish.

Key Points

• Iltutmish organized his trusted nobles into a group of forty known as Turkan-i-Chahalgani.
• Turkan-i-Chahalgani. was a council of 40 Turkic and non-Turkish slaves who administered the Delhi Sultanate according to the wishes of Iltutmish.
• It was the first regular ministerial body in the history of the Indian subcontinent.
• The council was established to assist the emperor in the exercise of his administrative and political authority.

Additional Information

• Iltutmish was regarded by several historians as the real founder and consolidator of the Slave Dynasty and the Delhi Sultanate.
• He was the third of the Mamluk kings who ruled the erstwhile Ghurid territories in North India.
• In the late 1190s, Ghurid slave-commander Qutb al-Din Aibak bought it in Delhi.
• He presented a silver tanka and a copper jital.
• He established the iqtadari system: the division of the empire into iqtas, which were assigned to nobles and officials in exchange for salary.

The correct answer is Arunachal Pradesh.

Key Points

• In Arunachal Pradesh, Ponu Yoksi is used during ceremonial dances performed by priests.
• There are two iron plates in the middle which have holes.
• When the player moves the sword, the plate starts to play which the priest uses to maintain the rhythm during the ceremonial dance.

Additional Information

• Other Instruments of Arunachal Pradesh-
• 'Ame Bali’ is a heavy metal plate that is struck with a stick to keep the beat.
• ‘Kiring’ is an instrument similar to the ‘ghungroo’ with metal beads bound together and the player jingles it with his hand.
• The ‘Emul’ is an instrument that is made up of a group of star-shaped metal pieces which when clanged against each other produce a sound.

The correct answer is Arboriculture.

• Arboriculture is a practice of establishing and managing individual trees generally for amenity purposes.

Key Points

• The practice includes- 
• propagating
• transplanting
• pruning
• applying fertilizer
• spraying to control insects and diseases
• cabling and bracing
• treating cavities
• identifying plants
• diagnosing and treating tree damage and ailments
• arranging plantings for their ornamental values
• removing trees
• The well-being of individual plants is the major concern of arboriculture.
• The science of arboriculture studies how these plants grow and respond to cultural practices and to their environment.

Additional Information

• Floriculture is a discipline of horticulture concerned with the growing and marketing of flowers and ornamental plants, in addition to, usage in floral arrangement and design.
• Viniculture is the cultivation and harvesting of grapes, primarily to make wine.
• Silviculture is the art and science of controlling the establishment, growth, composition, health, and quality of forests and woodlands. This is done to meet the diverse needs and values of landowners and society such as wildlife habitat, timber, water resources, restoration, and recreation on a sustainable basis.

The correct answer is 14 September.

Key Points

• Hindi Diwas is celebrated every year on 14 September.
• Hindi Diwas is celebrated to commemorate the event when it was adopted as one of the official languages ​​of India.
• The purpose of this day is to raise awareness about the language.

Additional Information

• The Constituent Assembly of India, in 1949, recognized Hindi and adopted an Indo-Aryan language written in Devanagari script as the official language of the country.
• It is one of the 22 scheduled languages ​​of the Republic of India.
• On this day, the President of the country also honors people for their contribution in Hindi language and literature.
• According to the 2011 census, there are about 43.6 percent of the speakers who identify Hindi as their mother tongue.

The correct answer is Hindustan Aeronautics Limited.

Key Points

• Tejas is a single-seat, single-engine, lightweight, high-agility supersonic fighter aircraft. 
• It is designed by the  Aeronautical Development Agency in collaboration with Hindustan Aeronautics Limited.
• In Feb 2021, the Defence Ministry awarded a ₹48,000 crore contract to Hindustan Aeronautics Limited to supply 83 LCA (light combat aircraft) Mk-1A jets to the Indian Air Force.
• The Tejas Mk-IA will be equipped with an active electronically scanned array radar, beyond visual range missile, electronic warfare suite, and air-to-air refueling system.
• The aircraft is a potent platform for air combat and offensive air support missions while reconnaissance and anti-ship operations are its secondary roles.
• The first Mk-1A aircraft will be delivered to the air force in three years, with the rest being supplied by 2030.

Additional Information

• In October 2014, the first series-production aircraft successfully completed its maiden flight and was handed over to the Indian Air Force in January 2015.
• HAL is building a third Tejas production line and it would roll out the two-seat trainer variants of the jet.

The correct answer is Gallium.

Key Points

• Gallium is one of the metals used in LED semiconductor technology.
• A light-emitting diode (LED) is a semiconductor light source that emits light when current is passed through it.
• Gallium is the first and primary element used in the manufacture of almost all semiconductor LED devices.
• Gallium is a metallic material found as a trace element in coal, bauxite and other minerals.
• The symbol for gallium is "Ga" - (atomic number 31).
• The specialty semiconductors used for LED manufacturing are gallium arsenide (GaAs), gallium phosphide (GaP), or gallium arsenide phosphide (GaAsP).

Additional Information

• Indium gallium nitride (InGaN): blue, green and ultraviolet high-brightness LEDs
• Aluminum gallium indium phosphide (AlGaInP): yellow, orange and red high-brightness LEDs
• Aluminum gallium arsenide (AlGaAs): red and infrared LEDs

The correct answer is d-block.

Key Points

• Elements from groups 3 to 12 are called d-block elements or transition elements.
• As a group, they exhibit typical metallic properties and are less reactive than metals in groups 1 and 2.
• The term 'transition' refers to the fact that the d sublevel, which is in the process of filling, is at a lower principal energy level than the s sublevel previously filled.
• The electrons of transition metals can participate in the formation of chemical bonds - in two shells instead of just one.
• Transition metal compounds that dissolve in water exhibit a wide variety of bright colors.
• As visible light passes through a transition metal compound dissolved in water, the d-orbitals absorb light of different energies.
• Visible light of a given energy level that is not absorbed produces a solution of a specific colour.

Additional Information

• The periodic table is managed by the International Union of Pure and Applied Chemistry, or IUPAC.
• The modern periodic table sorts the elements according to increasing atomic number instead of increasing atomic mass.
• There are 118 elements in a periodic table.
• There are seven periods and eighteen groups in the modern periodic table.

The correct answer is Switzerland.

Key Points

• The International Hockey Federation (FIH) is headquartered in Lausanne, Switzerland.
• It is the international governing body of field hockey and indoor field hockey.
• It is responsible for major international hockey tournaments, especially the Hockey World Cup.​

Additional Information

• International Hockey Federation (FIH)
• President: Seif Ahmed
• Headquarters: Lausanne, Switzerland
• CEO: Thierry Weil
• Founder: Paul Léautey

Important Points

• The International Hockey Federation was founded on 7 January 1924 in Paris by Paul Leute, who became the first president.
• It was established in response to the omission of field hockey from the schedule of the 1924 Summer Olympics.
• In total, there are 139 member associations within the five federations recognized by the FIH.

The correct answer is Chandrabhan Brahman.

Key Points

• Chandrabhan Brahmin wrote the book 'Char Chaman' describing the Mughal nobility during the reign of Shah Jahan.
• Chander Bhan Brahmin was a scribe who served in the Mughal court from the 1630s to the 1660s.
• He was an accomplished Persian poet and prose stylist.
• His service spanned the reign of four emperors: Akbar (1556–1605), Jahangir (1605–1627), Shah Jahan (1628–1658), and Aurangzeb' Alamgir (1658–1707), the last of the "Great Mughals".

Additional Information

• Chahar Chaman
• It is divided into four chamans.
• The first describes various festivals in the court, on those occasions the author recites portions of poetry.
• The second describes the splendor of the court, the daily business of Shah Jahan, his new capital, Shahjahanabad, and the major cities and suburbs of the empire.
• The third contains the author's life and some of his letters.
• The fourth deals with moral and religious subjects.

The correct answer is Lumbini.

Key Points

• The place of birth of Gautam Buddha was a grove known as Lumbini.
• The inscription on the pillar erected by the Mauryan emperor Ashoka in 249 BC testifies that Lord Buddha was born in 563 BC in the sacred region of Lumbini in the Terai plains of southern Nepal.
• Lumbini has significant evidence about the nature of Buddhist pilgrimage sites from the 3^rd century BCE.
• Bodh Gaya in Bihar is known for the place of Buddha's enlightenment.
• The complete knowledge given to the Buddhas is known as Samyakbodhi.

Additional Information

• Buddha gave his first sermon at Sarnath.
• Buddha attained Mahaparinirvana at Kushinagar in Uttar Pradesh.

Given:

Cost price of a computer table = Rs.10000

Cost price of a centre table = Rs.5000

Profit % for computer table = 8%

Formula:

SP - CP = Profit

Profit % = (SP - CP)/CP × 100

Calculation:

Selling price of a computer table = 10000 × 108/100 = Rs.10800

Total cost price of computer table and centre table = 10000 + 5000 = Rs.15000

Selling price of a computer table and centre table = 15000 × 110/100 = Rs.16500

Selling price of a centre table = 16500 - 10800 = Rs.5700

Profit % when selling price of a centre table = (5700 - 5000)/5000 × 100 = 14%

∴ Profit % for centre table is 14%.

Given:

$\frac{cot^3θ}{cosec^2θ}+\frac{tan^3θ}{sec^2 θ}$ + 2sinθ cosθ 

Formula:

(a + b)² = a² + b² + 2ab

sin²θ + cos²θ = 1

Calculation:

$\frac{cot^3θ}{cosec^2θ}+\frac{tan^3θ}{sec^2 θ}$ + 2sinθ cosθ 

⇒ $cos^3θ\over sin^3θ$ × sin²θ + $sin^3θ\over cos^3θ$ × cos²θ + 2sinθ cosθ 

⇒ $cos^3θ\over sinθ$ + $sin^3θ\over cosθ$ + 2sinθ cosθ

⇒ ${sin^4θ+cos^4θ+2sin^2θ cos^2θ}\over{sinθ cosθ}$ 

⇒ $({sin^2θ+cos^2θ})^2\over{sinθ cosθ}$ = $1\over{sinθ cosθ}$

⇒ ${1\over sinθ}\times{1\over cosθ}$ = cosecθ secθ ($1\over{sinθ}$ = cosecθ, $1\over{cosθ}$ = secθ) 

∴ $\frac{cot^3θ}{cosec^2θ}+\frac{tan^3θ}{sec^2 θ}$ + 2sinθ cosθ = cosecθ.secθ

Given:

Diameter of cone = 8.4m

Height of cone = 1.75m

Formula used:

Pythagoras Theorem,

h = $\sqrt{p^2+b^2}$

Where, h = hypotenuse, p = perpendicular, and b = Base

The curved surface area of the cone = πrl

Where, l = Slant height, r = Radius

Calculation:

Radius of cone = $8.4\over2$ = 4.2 m

Using Pythagoras Theorem,

l = $\sqrt{r^2+h^2}$

⇒ l = $\sqrt{4.2^2+1.75^2}$ 

⇒ $\sqrt{20.7025}$ = 4.55 m

The curved surface area of the cone = πrl

⇒ $22\over7$ × 4.2 × 4.55

⇒ 60.06 m² 

∴ The area of canvas required is 60.06 m².

Given:

Arshad got = 35% of total votes

Calculation:

Let the total number of votes polled be N.

Arshad got votes = N × 35/100 = 7N/20

Chamanlal got votes = N/35 × 14 = 2N/5

Jagjit got votes = N - 7N/20 - 2N/5 = N/4

Jagjit got less number of votes while Chamanlal won the election.

Then,

⇒ 2N/5 = N/4 + 4950

⇒ N = 33000

∴ Total number of votes polled is 33000.

Given:

Train leaves station A at 8am

Train completes journey in 4 hours

Car leaves station B at 8.30am

Car completes journey in 3.5 hours

Formula Used:

Speed = Distance/time

Calculation:

Let the total distance between the two stations be A km

According to the question

Speed of car = $\frac{2A}{7}$ kmph

Speed of train = $\frac{A}{4}$ kmph

⇒ Distance covered by train in half-hour = $\frac{A}{4}$ × $\frac{1}{2}$ = $\frac{A}{8}$ km

Remaining distance = A - $\frac{A}{8}$ = $\frac{7A}{8}$ km

Let the time after which they meet be B hours

⇒ $\frac{A\times B}{4}$ + $\frac{2A\times B}{7}$ = $\frac{7A}{8}$

⇒ $\frac{B}{4}$ + $\frac{2B}{7}$ = $\frac{7}{8}$

⇒ $\frac{7B+8B}{28}$ = $\frac{7}{8}$

⇒ $\frac{15B}{7}$ = $\frac{7}{2}$

⇒ B = $\frac{49}{30}$ = $\frac{98}{60}$ = 1 hour 38 minutes

Train will meet car at 8.30 + 1 hour 38 mins = 10.08 am

∴ Train will meet car at 10.08 am.

Given:

4x⁴ - 37x² + 9 = 0 and x > √3/2

Calculation:

⇒ 4x⁴ - 37x² + 9 = 0

Let us consider x² = a,

⇒ 4a² - 37a + 9 = 0

⇒ 4a² - 36a - a + 9 = 0

⇒ 4a(a - 9) - 1(a - 9) = 0

⇒ (4a - 1)(a - 9) = 0

a = 1/4 or a = 9

Then,

x² = 1/4 not acceptable as x > √3/2 means x² > 3/2 .

x² = 9 then x = 3 or x = -3 (not valid as x > √3/2)

Then, put x = 3

⇒ ? = 8x³ - 27/x³

⇒ ? = 8 × 3³ - 27/3³

⇒ ? = 215

∴ 8x³ - 27/x³ = 215

Given:

A's 1 day's work = 1/15

B's 1 day's work = 1/10

Calculation:

(A + B)'s 1 day's work = 1/15 + 1/10 = 1/6

(A + B)'s 4 days work = 4 × 1/6 = 2/3

Remaining work = 1 - 2/3 = 1/3

Work completed in 3 days by A and C = 1/3 × 1/3 = 1/9

Let C's 1 day's work be 1/C.

⇒ 1/15 + 1/C = 1/9

⇒ 1/C = 2/45

C alone can complete work in = 45/2 days

Time taken by C to complete 40% of work = 40/100 × 45/2 = 9 days

∴ Time taken by C to complete 40% of work is 9 days.

Alternate Method

Hence, C does in 3 days = 30 - (3 + 2) × 4 - (2 × 3) = 4 units

C does = 4/3 units a day

Required days = 30 × 40% ÷ 4/3 = 9 days

∴ Time taken by C to complete 40% of work is 9 days.

The number of days in which person alone can complete work × fraction of work = Time taken by the person to complete a fraction of work.

Given:

Marked price of article = Rs.4820

Formula:

Total discount when a% and b% are successive discounts = (a + b) - (ab/100)

Discount amount = Marked price × discount%/100

Calculation:

Total discount for A = (20 + 20) - (400/100) = 36%

Discount for A = 4820 × 36/100 = Rs.1735.2

Total discount for B = (15 + 25) - (15 × 25/100) = 36.25%

Discount for B = 4820 × 36.25/100 = Rs.1747.25

Total discount for C = (30 + 10) - 300/100 = 37%

Discount for C = 4820 × 37/100 = Rs.1783.4

∴ From above, shopkeeper C gives maximum discount of Rs.1783.4

Shortcut Trick By observation, for the equation a − 12/a = 1, let a = 4. Check: 4 − 12/4 = 4 − 3 = 1 (Condition a > 0 is satisfied). Substitute a = 4 in the expression a2 + 16/a2. Value = 42 + 16/42 ⇒ 16 + 16/16 = 16 + 1 = 17. ∴ The correct answer is 17.

Alternate Method Given: a − 12/a = 1 where a > 0. Formula Used: Quadratic Equation Factorization. ⇒ a − 12/a = 1 ⇒ a2 − 12 = a ⇒ a2 − a − 12 = 0 ⇒ a2 − 4a + 3a − 12 = 0 ⇒ a(a − 4) + 3(a − 4) = 0 ⇒ (a − 4)(a + 3) = 0 ⇒ a = 4 or a = −3 ⇒ Since a > 0, we take a = 4. ⇒ Required value = a2 + 16/a2 ⇒ Value = 42 + 16/42 ⇒ Value = 16 + 1 = 17. ∴ The correct answer is 17.

Additional Information Quadratic Formula The roots of any quadratic equation ax2 + bx + c = 0 can be found using x = (−b ± √(b2 − 4ac)) / 2a. Nature of Roots The term D = b2 − 4ac is called the discriminant. If D > 0, the equation has two distinct real roots. Algebraic Identities For problems involving x + 1/x = k, remember that x2 + 1/x2 = k2 − 2. Adjustments must be made if coefficients are unequal.

Given:

∠ACD = 25° 

Calculation:

AB is the diameter of the circle.

∠ACD = 25° 

∠ACD = ∠ABD = 25° (Angles formed on the same arc are equal.)

∠ADB = 90° (Angle formed by diameter in a semicircle)

In Δ ADB

∠BAD = 180° - (∠ADB + ∠ABD)

⇒ 180° - (90° + 25°) = 65° 

∴ ∠BAD = 65° 

Now, In quadrilateral ABED,

∠BAD + ∠BED = 180° (Sum of opposite angles are 180°)

⇒ 65° + ∠BED = 180° 

⇒ ∠BED = 180° - 65° = 115° 

∴ The measure of ∠BED is 115°.

Given:

One angle = 74°

Calculation:

In the above figure, AD and BE are angle bisectors of ∠A and ∠B respectively.

⇒ ∠A = ∠a/2 + ∠a/2

⇒ ∠B = ∠b/2 + ∠b/2

In ΔABC,

⇒ ∠A + ∠B + ∠C = 180°

⇒ 2∠a/2 + 2∠b/2 + 74 = 180°

⇒ ∠a/2 + ∠b/2 = 53°

Then,

In ΔAPB,

⇒ ∠PAB + ∠ABP + ∠BPA = 180°

⇒ ∠BPA = 180° - (a/2 + b/2) 

⇒ ∠BPA = 180° - 53° = 127°

∴ The angle between the bisectors of the other two interior angles is 127°.

Alternate Method In ΔABC, such that ∠ACB = 74° and bisectors ∠A and ∠B meet at D and E.

Now, In ΔABC,

∠ACB + ∠ABC + ∠BAC = 180° 

⇒ 74° + ∠ABC + ∠BAC = 180° 

⇒ ∠ABC + ∠BAC = 180° - 74° = 106° 

⇒ $1\over2$(∠ABC + ∠BAC) = 53° 

∠PBA + ∠BAP = 53° (PA and PB bisect ∠BAC and ∠ABC)

Now, In ΔPAB,

∠PBA + ∠BAP + ∠BPA = 180° 

⇒ 53° + ∠BPA = 180° 

⇒ ∠BPA = 180° - 53° = 127° 

∴ ∠BPA = 127°

Given:

⇒ (16√2x3 + 81√3y3) ÷ (2√2x + 3√3y) = Ax2 + By2 + Cxy

Formula:

⇒ a³ + b³ = (a + b)(a² + b² - ab)

Calculation:

⇒ (16√2x3 + 81√3y3) ÷ (2√2x + 3√3y) = Ax2 + By2 + Cxy

⇒ Ax2 + By2 + Cxy = [(2√2x + 3√3y)(8x² + 27y² - 2√2x × 3√3y)]/(2√2x + 3√3y)

⇒ Ax2 + By2 + Cxy = (8x2 + 27y2 - 2√2x × 3√3y)

⇒ Ax2 + By2 + Cxy = (8x2 + 27y2 - 6√6xy)

A = 8, B = 27 and C = -6√6

Then,

⇒ ? = 2A - 3B - 2√6C

⇒ ? = 2 × 8 - 3 × 27 - 2√6 × (-6√6)

⇒ ? = 16 - 81 + 72

⇒ ? = 7

∴ 2A - 3B - 2√6C = 7

Given:

2sin(3x -15)° = 1

Calculation:

sin(3x - 15)° = 1/2

⇒ sin (3x - 15)° = sin 30° 

⇒ (3x - 15)° = 30° 

⇒ 3x = 30° + 15° = 45° 

⇒ x = $45\over3$ = 15° 

Then,

cos²(2x +15)° + cot2 (x +15)°

cos2(2 × 15 +15)° + cot2 (15 +15)°

⇒ cos²(45)° + cot²(30)°

⇒ $({1\over \sqrt2})^2$ + $(\sqrt3)^2$

⇒ $1\over2$ + 3 = $7\over2$ 

∴ cos2(2x +15)° + cot2 (x +15)° = $7\over2$

Calculation:

Total number of students in section E = 300 × 14/100 = 42

Number of boys in section E = 42 × 3/7 = 18

Total number of students in section C = 300 × 19/100 = 57

Number of girls in section C = 57 - 34 = 23

∴ the ratio of number of boys in section E to the number of girls in section C is = 18 : 23

Calculation:

Total number of students enrolled in institute B in 2015 and 2017 = 360 + 325 = 685

Total number of students enrolled in institute A in 2014 and 2016 = 160 + 300 = 460

∴ ratio fo the total numbers of students enrolled in institute B in 2015 and 2017 to that of students enrolled in institute A in 2014 and 2016 = 685 : 460 = 137 : 92

Shortcut Trick

In this configuration where DF || AC and DE || AF, the segments on the base follow a geometric progression property.

Using the Basic Proportionality Theorem twice, we derive: BF² = BE × BC.

Let EF = x cm. Then BF = 4 + x and BC = 4 + x + 3 = 7 + x.

⇒ (4 + x)² = 4 × (7 + x)

⇒ 16 + x² + 8x = 28 + 4x ⇒ x² + 4x − 12 = 0

⇒ (x + 6)(x − 2) = 0 ⇒ x = 2 (since length cannot be negative).

∴ The correct answer is 2 cm.

Alternate Method

Given: BE = 4 cm, CF = 3 cm, DF || AC, and DE || AF.

Formula Used: Basic Proportionality Theorem (BPT) states that if a line is parallel to one side of a triangle, it divides the other two sides in the same ratio.

A B C D E F 4 cm EF

Calculation:

Bonus amount for Varun = Rs.1240

Bouns amount for Amit and Nitin = 1000 + 1000 = Rs.2000

Required % = (2000 - 1240)/2000 × 100 = 38%

∴ Bonus of Varun is 38% less than the bonus of Amit and Nitin taken together.

Given:

Ratio of Rs.1, Rs.2, Rs.5 and Rs.10 coins = 10 : 5 : 2 :1.

Calculation:

Let number of Rs.1, Rs.2, Rs.3 and Rs.10 coins be 10a, 5a, 2a and a respectively.

⇒ 10a + 5a + 2a + a = 72

⇒ a = 4

Number of coins of  Rs.1, Rs.2, Rs.5 and Rs.10 coins = 40, 20, 8 and 4 respectively.

Total amount in piggy bank = 40 × 1 + 20 × 2 + 8 × 5 + 4 × 10 = Rs.160

∴ There was Rs.160 money was there in the piggy bank in the form of coins.

Formula:

Average = (sum of terms)/(Number of terms)

Calculation:

First 8 prime numbers = 2, 3, 5, 7,11, 13, 17, 19

First 10 even natural numbers = 2, 4, 6, 8, 10, 12, 14,16,18, 20

Average of first 8 prime numbers = (2 + 3 + 5 + 7 + 11 + 13 + 17 + 19)/8 = 77/8

Average of first 10 even natural numbers = (2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20)/10 = 110/10 = 11

Required ratio = (77/8) : 11 = 7 : 8

∴ the ratio of the average of first eight prime numbers to the average of first ten even natural numbers is 7 : 8.

Given:

Number = 7p5964q28 

Calculation:

Number should be divisible by 88 then number should be divisible by 8 and 11 both.

Largest possible value of q to be divisible by 8 is = 9

⇒ 928/8 = 116

For q = 9, then

Number should be divisible by 11 -

= (7 + 5 + 6 + 9 + 8) - (p + 9 + 4 + 2) 

= 20 - p

(20 - p) should be divisible by 11 then for p = 9 this condition will satisfy.

So, the possible value of p = 9

Then,

∴ p² - q = 81 - 9 = 72

Calculation:

Trees planted in year 2016 = 1800 + 2500 + 1800 + 2000 = 8100

Trees planted in year 2017 =  2500 + 2300 + 1850 + 1800 = 8450

Trees planted in year 2018 = 2300 + 2400 + 1840 + 1760 = 8300

Trees planted in year 2019 = 2440 + 1950 + 1900 + 1600 = 7890

Trees planted in year 2020 = 2250 + 2100 + 2000 + 1750 = 8100

∴ From above, in year 2017 maximum number of trees planted.

Given:

Amount after 3 years = Rs.14880

Amount after 5 years = Rs.16800

Formula:

Let P = Principal, R = Rate of interest and N = time period

Simple interest = PNR/100

Amount = Principal + SI

Calculation:

Amount for 3 years

⇒ 14880 = PR × 3/100 + P      ----(1)

Amount for 5 years

⇒ 16800 = PR × 5/100 + P      ----(2)

Subtracting eq(1) from eq(2)

2PR/100 = 1920

⇒  PR = 96000

Then,

⇒ 16800 = 96000 × 5/100 + P

⇒ P = 12000

Sum is Rs.12000.

Simple interest = 12000 × 10 × 4/100 = Rs.4800

∴ Simple interest on the same sum at 10% per annum for 4 years is Rs.4800.

given:

? = $3\frac{5}{6}+\left[3\frac{2}{3}+\lbrace{\frac{15}{4}\left(5\frac{4}{5}÷ 14\frac{1}{2}\right)\rbrace}\right]$

concept:

calculation**:** 

⇒ ? = $3\frac{5}{6}+\left[3\frac{2}{3}+\lbrace{\frac{15}{4}\left(5\frac{4}{5}÷ 14\frac{1}{2}\right)\rbrace}\right]$

⇒ ? = 23/6 + [11/3 + {15/4 × (29/5 ÷ 29/2)}]

⇒ ? = 23/6 + [11/3 + {15/4 × 2/5}]

⇒ ? = 23/6 + [11/3 + 3/2]

⇒ ? = 23/6 + 31/6

∴ ? = 9

Given:

AB = 20 cm

BC = 21 cm 

AC = 29 cm

Concept used:

Pythagoras' theorem states that “In a right-angled triangle, the square of the hypotenuse side is equal to the sum of squares of the other two sides.

Calculation:

Using pythagoras theorem,

AC² = AB² + BC²

⇒ 29² = 20² + 21²

ΔABC is a right angled triangle.

⇒ cot C = BC/AB = 21/20

⇒ cosec C = AC/AB = 29/20

⇒ tan A = BC/AB = 21/20

cot C + cosec C - 2tan A = 21/20 + 29/20 - 2 × 21/20

⇒ 8/20

⇒ 2/5

So, the value of cot C + cosec C - 2tan A = 2/5

Given:

AB = 11 cm

AP = 7 cm

AQ = 9 cm

Concept used:

Tangents drawn from same external point are equal in lengths.

Calculation:

Tangents drawn from same external point are equal in lengths.

AB = AC, BP = PR and CQ = RQ

⇒ AB = AC = 11 cm

⇒ BP = AB - AP = 11 - 7 = 4 cm

⇒ CQ = AC - AQ = 11 - 9 = 2 cm

⇒ BP + CQ = 4 + 2 = 6 cm 

⇒ BP + CQ = PR + RQ = 6 cm

⇒ PR + RQ = PQ = 6 cm

So, the length of PQ is 6 cm.

The error is in "Would you liked".

Key Points

• The usage of the word 'liked' which is in past tense is incorrect.
• Liked here is referring to past tense, but the sentence is in present tense.
• The correct sentence: Would you like to have some fries along with your coffee, sir?” asked the waiter.
• Hence, the correct answer is option 1.

The correct synonym is Refresh.

Key Points

• Rejuvenate means to make somebody/something feel or look younger and energetic again (किसी को युवा बना देना)
• Rejuvenate synonyms are: freshen, recharge, recreate, refresh, regenerate, renew, repair, etc.
• Rejuvenate antonyms are: damage, destroy, kill, ruin, lose, miss, etc.
• Reset: set again or differently. (फिर से जोड़ना या बनाना )
• Retell: tell (a story) again or differently. (पुनः कहना)
• Retake: take (something) again. (फिर से लेना)
• Refresh: to make somebody/something feel less tired or less hot and full of energy again (ताज़ा करना)
• Hence, the correct answer is option 4.

The incorrectly spelt word is 'Pessymist'.

Key Points

• The correct spelling is Pessimist.
• Pessimist means a person who always thinks that bad things will happen or that something will not be successful (निराशावादी व्‍यक्ति)
• Optimist: An optimist is someone who always sees the bright side of any situation — a trait that can be either encouraging or annoying, depending on your frame of mind. (आशावादी व्यक्ति)
• Perfectionist: a person who always does things as well as he/she possibly can and who expects others to do the same (ऐसा व्‍यक्ति जो अपना काम उत्तम रीति से करे तथा दूसरों से भी वैसी ही आशा करे; पूर्णतावादी)
• Fatalist: A fatalist is someone who feels that no matter what he or she does, the outcome will be the same because it's predetermined. Fatalists share a sense of being powerless to change the world. (भाग्यवादी)
• Hence, the correct answer is option 1.

The correct answer is 'Dormitory'.

Key Points

• Dormitory: a large bedroom with a number of beds in it, especially in a school, etc. (अनेक पलंगों वाला बड़ा शयनकक्ष (विशेषतः स्‍कूल आदि में))
• Assembly: a large group of people who come together for a particular purpose (समागम, सभा, जमावड़ा)
• Creche: a place where small children are looked after while their parents are working, shopping, etc. (माता-पिता की अनुपस्थिति में शिशुओं की देखभाल का स्‍थान; शिशुसदन, शिशुगृह)
• Hostel: a place like a cheap hotel where people can stay when they are living away from home (घर से बाहर रहने का अपेक्षाकृत सस्‍ता स्‍थान; होस्‍टल, छात्रावास)
• Hence, the correct answer is option 4.