RRB NTPC Tier I Official Paper (Held On: 22 Apr 2016 Shift 3) (Previous Year Paper)

Given:

Rakesh invests 10,000 rupees in a fixed deposit scheme for 2 years at 5% per annum compound interest.

Formula used:

Amount = P × (1 + R/100)^T

P = Principal

R = rate %

T = time

Calculation:

According to the question,

P = Rs. 10,000, R = 5%, T = 2 years

Amount = P × (1 + R/100)^T

⇒ Amount = 10,000 × (1 + 5/100)²

⇒ 10,000 × 105 × 105/10,000

⇒ Rs. 11,025

∴ He will receive Rs. 11,025 on maturity of fixed deposit amount.

By using ladder system

P = Rs. 10000, R = 5%, T = 2 years

Amount = principal + compound interest

⇒ 10000 + 1025

⇒ Rs. 11025

∴ He will receive Rs. 11,025 on maturity of fixed deposit amount.

The pattern followed here is:

According to the alphabetical positions of the letters,

Hence, ‘OML’ is the correct answer.

The correct answer is Data Storage System.

Blu-Ray Disc is a Data storage system.

Key Points

• Blu-ray is an optical disc format such as CD and DVD.
• It was developed for recording and playing back high-definition (HD) video and for storing large amounts of data back in 2006.
• A  CD can hold 700 MB of data and a basic DVD can hold 4.7 GB of data, whereas a single Blu-ray disc can hold up to 25 GB of data.
• While a double-sided, dual-layer DVD (which is not common) can only hold 17 GB of data. Dual-layer Blu-ray discs will be able to store 50 GB of data. That is equivalent to 4 hours of HDTV.
• A group of the world's leading consumer electronics, personal computer, and media manufacturers like Apple, Dell, Hitachi, HP, JVC, LG, Mitsubishi, Panasonic, Pioneer, Philips, Samsung, Sharp, Sony, etc.

Additional Information

Medical equipment:-

• It is used for the specific purposes of diagnosis and treatment of disease or rehabilitation following disease or injury, it can be used either alone or in combination with any accessory, consumable or other pieces of medical equipment.

Musical instrument:-

• It is any device for producing a musical sound.
• The principal types of such instruments, classified by the method of producing sound are percussion, string instruments, keyboard, wind, and electronic.

Given:

Sunil has only Rs 100.

Calculation:

According to the question, we have to check the combination

He has to buy a soap, an oil bottle, a kilo of potatoes and a chocolate.

A. An oil bottle of Rs 44, chocolate of Rs 23, soap of Rs 2 and half kg of potatoes of Rs 16.

⇒ 44 + 23 + 2 + 16 × 2

⇒ Rs. 101

B. An oil bottle of Rs 40, chocolate of Rs 20, soap of Rs 17 and a kg of potatoes for Rs 34.

⇒ 40 + 20 + 17 + 34

⇒ Rs. 111

C. Half a kilo potato of Rs 12, soap of Rs 23, chocolate of Rs 5 and an oil bottle of Rs 39.

⇒ 12 × 2 + 23 + 5 + 39

⇒ Rs. 91

D. Chocolate of Rs 50, soap of Rs 7, an oil bottle of Rs 30 and a kg  of potato of Rs 29 per kg.

⇒ 50 + 7 + 30 + 29

⇒ Rs. 116

∴ Sunil buy 'C' combination.

The correct answer is Consecutive flow.

Key Points

• A heat exchanger is a device used to transfer heat between two or more fluids.
• The fluids can be single or two-phase and, depending on the exchanger type, may be separated or indirect contact.
• Devices involving energy sources such as nuclear fuel pins or fired heaters are not normally regarded as heat exchangers although many of the principles involved in their design are the same.
• Classification of Heat Exchangers by Flow Configuration:-
• There are four basic flow configurations:
• Counter Flow
• Concurrent Flow
• Crossflow
• Hybrids such as Cross Counterflow and Multi-Pass Flow

The correct answer is Bikxie Pink.

• The first two-wheeler public transport service for all women started in Gurgaon was called Bikxie Pink.

Key Points

• Bikxie - a bike taxi - is a service that has been playing on congested Gurgaon roads to get you to work and other engagements on time.
• Bikxie, a two-wheeler taxi service provider, has announced the ‘soft launch’ of its women-only service Bikxie Pink in Delhi, on the occasion of International Women’s Day 2018.
• A first-of-its-kind service in the national capital, Bikxie Pink offers a fleet of electric scooters exclusively driven by women and for women.
• The service was earlier launched in Gurugram in January 2016 and claims to have received immense popularity from women commuters in the city.
• Bikxie Pink will initially be rolled out with 10 women pilots, but the numbers shall increase to more than 100 female pilots in the next few months across Delhi NCR.
• On the Bikxie mobile app, female customers will be able to opt for Bikxie Pink pilots, or they may hail the scooties from key metro stations.
• The app-based service is segmented into Bikxie Blue for men and Bikxie Pink for women - a safe solution where the driver is the same sex as the customer.

Given:

The ratio of a triangle = 2 : 3 : 5

Concept:

The sum of the three angles of a triangle is 180° 

Calculation:

Let, the smallest angle be 2x

The medium angel be 3x 

The largest angle be 5x

According to the question:

⇒ 2x + 3x + 5x = 180° 

⇒ 10x = 180° 

⇒ x = 18° 

Now,

The smallest angle = 2x = 2 × 18 = 36° 

The medium angel = 3x = 3 × 18 = 54° 

The largest angle = 5x = 5 × 18 = 90° 

Again, 

(The largest angle + The smallest angle) : The smallest angle.

⇒ (90° + 36°) : 36° 

⇒ 126° : 36°  = 7 : 2

∴ The ratio of the sum of the largest angle and the smallest angle to the smallest angle 7 : 2.

Shortcut Trick

The ratio of the given ratios will be equal to the ratio of the actual values of the angles.

According to the question:

(The largest angle + The smallest angle) : The smallest angle

⇒ (5 + 2) : 2 = 7 : 2

∴ The ratio of the sum of the largest angle and the smallest angle to the smallest angle 7 : 2.

The correct answer is  First.

• The first Indian spacecraft entered the orbit of Mars in its first effort.

Key Points

• Mars Orbiter Mission (MOM), the maiden interplanetary mission of ISRO, launched on November 5, 2013, by PSLV-C25 got inserted into Martian orbit on September 24, 2014, in its first attempt. 
• MOM completes 1000 Earth days in its orbit, well beyond its designed mission life of six months.
• 1000 Earth days corresponds to 973.24 Mars Sols (Martian Solar day) and MOM completed 388 orbits which were more than enough.

Additional Information

• ISRO:
• Founded:- 15 August 1969
• Chairman:- Dr. K Sivan

Given:

Number = 732XY

Divisor = 70

Concept used:

Divisibility Rule:

10 → Last digit should be zero.

7 → [Last three digit – remaining digits] should be divisible.

Calculation:

Number = 732XY

Divisor = 10 × 7

According to the divisibility rule of 10,

Y should be zero.

Then the value of Y = 0

And number = 732X0

Now, we check, divisibility of 7,

And we can see 732X

According to the divisibility rule of 7,

32X – 7,

Here, possible value of X is 1, 2, 3, 4, 5, 6, 7, 8, 9, 0

Put X = 1,

321 – 7 = 314

⇒ 314/7 not divisible by 7

Put X = 2,

322 – 7 = 315

⇒ 315/7 = 45, so it is divisible by 7

Our required value of X = 2, Y = 0

⇒ X – Y = 2 – 0 = 2

∴ The value (X – Y) is 2.

The correct answer is Abu Dhabi.

Key Points

• International Renewable Energy Agency (IRENA):
• It is the first international organization to focus exclusively on renewable energy, addressing needs in both industrialized and developing countries.
• It was founded in 2009 and its statute entered into force on 8 July 2010.
• It is headquartered in Masdar City, Abu Dhabi.

Additional Information

• IRENA is an official United Nations observer.
• IRENA aims to become the main driving force in promoting a transition towards the use of renewable energy on a global scale:
• Acting as the global voice for renewable energies, IRENA provides advice and support to governments on renewable energy policy, capacity building, and technology transfer.
• IRENA will also co-ordinate with existing renewable energy organizations, such as REN15.

Important Points

• India has become the 77th founding member of IRENA.

Given equation: 20 × 7 + 15 - 21 × 105 ÷ 95

When the mathematical signs '-' and '÷' are interchanged in the equation given, we get:

20 × 7 + 15 ÷ 21 × 105 – 95

= 140 + 75 – 95

= 215 – 95

= 120

Hence, ‘120’ is the correct answer.

By using the symbols in the table given below, we can draw the following family tree:

P is grandmother of S, but as the gender of R is not known, it is not definite if P is the maternal grandmother or paternal grandmother of S.

So, the exact relation between P and S cannot be determined.

Hence, ‘Cannot be determined’ is the correct answer.

Given:

Height of the tree = 16√3 m

The shade of the tree = 16 m

Formula used:

tan60° = √3

tanθ = Opposite side/Adjacent side

Calculation:

tanθ = (16√3)/16

⇒ tanθ = √3 = tan60°

∴ The elevation angle is 60°.

The Correct Answer is C- Champaran​.

Key Points

• Champaran was Mahatma Gandhi's first successful satyagraha in India.
• The Champaran Satyagraha was the combination of elements of extra-constitutional struggle as well as the employment of moral force against an adversary, an exemplar of the rule of law; and the use of compromise as a gambit.
• It is marked as India’s First Civil Disobedience Movement launched by Mahatma Gandhi to protest against the injustice meted out to tenant farmers in the Champaran district of Bihar.

Additional Information 

• Kheda Satyagraha:
• It is a peasant struggle against the British government's demand for the full realization of the land tax by the peasants despite famine and crop losses.
• Hence, the peasants of Kheda demanded non-payment of land taxes.
• Bardoli Satyagraha:
• 1928 was a movement in the independence struggle led by Sardar Vallabhai Patel for the farmers of Bardoli against the unjust raising of taxes.
• Salt March:
• It took place from March to April 1930 in India, was an act of civil disobedience led by Mohandas Gandhi to protest British rule in India.
• During the march, thousands of Indians followed Gandhi from his religious retreat near Ahmedabad to the Arabian Sea coast, a distance of some 240 miles.

The correct answer is Connectivity status in a non-functional unit.

In the context of computers, 'online' does not mean Connectivity status in a non-functional unit.

Key Points

• Online means that the equipment or subsystem is connected, or that it is ready for use.
• "Online" has come to describe activities performed on and data available on the Internet,
• Example: "online identity", "online predator", "online gambling", "online shopping", "online banking", and "online learning".
• .Online means:- 
• Connectivity status in the network
• A situation where transactions can be done in real-time.
• Remote server access

The correct answer is Retinol.

Vitamin A is related to Retinol.

Key Points

• Retinol, also known as vitamin A1-alcohol, is a vitamin in the vitamin A family found in food and used as a dietary supplement.
• As a supplement it is ingested to treat and prevent vitamin A deficiency,
• Vitamin A is essential to maintain intact epithelial tissues as a physical barrier to infection, it is also involved in maintaining a number of immune cell types from both the innate and acquired immune systems.
• These include the lymphocytes (B-cells, T-cells, and natural killer cells), as well as many myelocytes (neutrophils, macrophages, and myeloid dendritic cells).

Additional Information

 Cobalamin:-

• It is also called vitamin B12.
• A vitamin important for the normal formation of red blood cells and for the health of the nerve tissues.

Ascorbic Acid:-

• It is a natural water-soluble vitamin (Vitamin C).
• Ascorbic acid is a potent reducing and antioxidant agent that functions in fighting bacterial infections, in detoxifying reactions, and in the formation of collagen in fibrous tissue, teeth, bones, connective tissue, skin, and capillaries.

Amino acid:-

• It is an organic molecule that is made up of a basic amino group (−NH2), an acidic carboxyl group (−COOH), and an organic R group (or side chain) that is unique to each amino acid.

The Correct Answer is Electromagnetic induction.

• Swiping a credit card is based on the principle of Electromagnetic induction

Key Points

• Electromagnetic or magnetic induction is the production of an electromotive force across an electrical conductor in a changing magnetic field
• Example: When we swipe the card, the credit card machine's coil of wires causes a change in the magnetic field. This is called electromagnetic induction.
• The change in magnetic field induces a voltage that creates a current that is used to signal your account information to the machine.
• When we swipe a magnetic-strip card, the technology transmits the bank information to the card reader, which sends it to Square. Then it is passed along that information to the acquiring bank. Square's magstripe reader plugs into your iOS or Android device's headset jack so we can take credit card payments anywhere.

Additional Information

• Frictional force refers to the force generated by two surfaces that contacts and slide against each other.
• Rubbing both hands together to create heat is an example of frictional force.
• Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation.
• Applications of the photoelectric effect brought us "electric eye" door openers, light meters used in photography, solar panels and photostatic copying.

The correct answer is Kerry Francis Bullmore Packer.

• The World Series Cup in the format of ODI cricket was originally organized by Kerry Francis Bullmore Packer.

Key Points

• Packer was best known for founding World Series Cricket.
• Kerry Francis Bullmore Packer was an Australian media tycoon and a business figure who, at the time of his death in 2005, was one of the richest and most influential men in Australia.
• Kerry Packer was born on December 17, 1937, in Sydney, Australia.
• He inherited the Australian Consolidated Press (ACP) group from his father, Sir Frank Packer. In the 1977–1978 season, he created World Series Cricket, contracting the leading test cricketers for a knock-out series of one-day matches and “Super Tests”.

The cluttered letters when arranged to make meaningful words is shown below:

A. ACETREH → TEACHER

B. UETSTND → STUDENT

C. YIBLRRA → LIBRARY

D. KRTMAE → MARKET

All options except 'MARKET' are terms associated with School.

Hence, 'KRTMAE' is the odd one out.

The correct answer is the Coalition government.

• India had a Coalition government during the period between 2009 and 2014.

Key Points

• A coalition government is a cabinet of a parliamentary government in which several political parties cooperate to reduce or to avoid the dominance of any one party within that coalition.
• The usual reason given for this arrangement is that no party on its own can achieve a majority in the parliament.
• The coalition might also be created in a time of national difficulty or economic crisis.
• As the elections were held in 2009, the UPA came back to power. Congress also improved its seats from 145 to 206 seats, while the BJP could only win 116 seats. Manmohan Singh was elected as the prime minister for a second term.
• The Narendra Modi government, which has been in power since 2014, is also a coalition government since the BJP’s alliance partners are also part of the government. But the BJP won 282 seats in the 2014 elections and was above the half-way mark on its own.

Additional Information

• All-Party Government:
• It is also a type of Coalition Government. A coalition government is a form of government in which political parties cooperate to form a government.
• The usual reason for such an arrangement is that no single party has achieved an absolute majority after an election.
• A one-party state, single-party state, one-party system, or single-party system
• ​It is a type of unitary state in which one political party has the right to form the government, usually based on the existing constitution.
• All other parties are either outlawed or allowed to take only a limited and controlled participation in elections.

Given:

tan24.tan48.tan42.tan66

Formula used:

tanθ = cot(90 – θ)

tanθ = 1/(cotθ)

Calculation:

tan48 = cot(90 – 48) = cot42

tan66 = cot (90 – 66) = cot24

Now we have

tan24.cot24.tan42.cot42

⇒ tan24.(1/tan24).tan42.(1/tan42) = 1

∴ The value of tan24.tan48.tan42.tan66 is 1.

The correct answer is 18.

Key Points

• The Government has decided to re-constitute the Prime Minister's Council on Climate Change to coordinate National Action for Assessment, Adaptation and Mitigation of Climate Change.
• The composition of the reconstituted Prime Minister's Council on Climate Change, as approved by Prime Minister consists of 18 members including Prime minister as its Chairperson.
• The Committee would focus on the following tasks:
• Evolve a coordinated response to issues relating to climate change at the national level.
• Provide oversight for formulation of action plans in the area of assessment, adaptation and mitigation of climate change.
• Periodically monitor key policy decisions.
• The Ministry of Environment, Forests and Climate Change will assist PMO in facilitating the work of this Committee.

Shortcut Trick

Ratio of Seema and Reema = 2 : 3. Difference in ratio units = 3 − 2 = 1 unit.

Given difference in age = 6 years. So, 1 unit = 6 years.

Present ages: Seema = 2 × 6 = 12 years; Reema = 3 × 6 = 18 years.

After 6 years: Seema = 12 + 6 = 18 years; Reema = 18 + 6 = 24 years.

New Ratio = 18 : 24 = 3 : 4.

∴ The correct answer is 3 : 4.

Alternate Method

Given: Current ratio = 2 : 3. Age difference = 6 years. Time interval = 6 years.

⇒ Let ages be 2x and 3x.

⇒ 3x − 2x = 6

⇒ x = 6

⇒ Seema age = 2 × 6 = 12 years

⇒ Reema age = 3 × 6 = 18 years

⇒ Ages after 6 years: Seema = 12 + 6 = 18, Reema = 18 + 6 = 24

⇒ Required Ratio = 18 : 24 = 3 : 4

∴ The correct answer is 3 : 4.

Additional Information

Constant Difference Rule

The difference between the ages of two people remains constant regardless of how many years pass.

Ratio Balancing

If the age difference is given, find the difference in ratio parts and equate it to the actual age difference to find the value of one unit.

Future/Past Ratios

To find age after 'n' years, add 'n' to current age. To find age 'n' years ago, subtract 'n' from current age.

The correct answer is Spiral.

• Shape of Milky way is Spiral.

Key Points

• Our Sun is a star and all the planets around it are part of a galaxy known as the Milky Way Galaxy.
• A galaxy is a large group of stars, gas, and dust bound together by gravity.
• They come in a variety of shapes and sizes.
• The Milky Way is a large barred spiral galaxy. All the stars we see in the night sky are in our own Milky Way Galaxy.
• The first clue to the shape of the Milky Way comes from the bright band of stars that stretches across the sky .
• This band of stars can be seen with the naked eye in places with dark night skies. That band comes from seeing the disk of stars that forms the Milky Way from inside the disk, and tells us that our galaxy is basically flat.

Important Points

• Our galaxy is called the Milky Way because it appears as a milky band of light in the sky when you see it in a really dark area.

The correct answer is Stones.

Key Points

• An excessive amount of Calcium causes Stones Oxalate in the Kidney.
• Calcium oxalate stones are the most common type of kidney stone.
• Kidney stones are solid masses that form in the kidney when there are high levels of calcium, oxalate, cystine, or phosphate and too little liquid.
• Calcium oxalate stones are caused by too much oxalate in the urine.
• Some foods that are very high in oxalate are:
• Nuts, Rhubarb, Beets, Chocolate soy milk, All-Bran, Buckwheat flour, Sesame seeds, Swiss chard, etc.

Additional Information 

Bronchitis:-

• Bronchitis is an infection of the tubes that lead to the lungs.
• It can be acute or chronic.
• Symptoms include a cough and wheezing.

Diabetes:-

• It is a metabolic disease that causes high blood sugar.
• The hormone insulin moves sugar from the blood into your cells to be stored or used for energy.

Meningitis:-

• It is an inflammation of the meninges.
• The meninges are the three membranes that cover the brain and spinal cord.
• It can occur when fluid surrounding the meninges becomes infected.
• Causes of meningitis are viral and bacterial infections.

Total naturalist = 100

15 want to see only butterflies, 30 want to see only birds

⇒ Remaining naturalist = (100 - 30 - 15) = 55

10 want to see both bees and butterflies, 20 want to see both birds and bees, 5 want to see both bees and bats and the rest of the people only want to see bats.

People want to see only bat is 55 - (10 + 20 + 5)

⇒ 20

∴ The number of naturalists who only want to see bats is 20

Number of naturalist want to see only bat is 100 - (15 + 30 +10 + 20 + 5)

⇒ 20

Number of naturalists who wants to see only butterfly is 15

Required ratio is 20 : 15

⇒ 4 : 3

∴ The ratio of naturalists who want to see only bats is to those who want to see only butterflies is 4 : 3

Out of all naturalists10 want to see both bees and butterflies, 20 want to see both birds and bees, 5 want to see both bees and bats.

Rest are want to see only one species

⇒ Number of naturalists want to see at least two of the four species is (10 + 20 + 5)

⇒ 35

∴ The naturalists want to see at least two of the four species is 35.

The correct answer is the Bank of Hindustan.

Key Points

• Moving towards modern India, the first bank of India was the Bank of Hindustan.
• This bank was established in the year 1770 but the bank was liquidated after 50 years of operations.
• Additionally, the second oldest bank in India was established in the year 1786 and the bank could only operate till 1791 before it collapsed. The name of this bank was Bank of India.
• Later in 1806, the Bank of Calcutta was incepted and this bank was later renamed as Bank of Bengal. After many orders to rename this bank, the State Bank of India came into existence.
• State Bank is Bank of Calcutta and this final change in the name went through in 1955.
• State Bank of India is also the largest public sector bank in India
• Now all the banks in India are governed by the Reserve Bank of India which is the central banking agency of India.
• RBI was established in 1935 and it is one of the most powerful institutions in India.

Given:

Average of {x + (1/x)} is P

Formula used:

(a + b)³ = a³ + b³ + 3ab(a + b)

Calculation:

{x + (1/x)}/2 = P

⇒ {x + (1/x)} = 2P      ----(1)

Cubing both sides

{x + (1/x)}³ = (2P)³

⇒ x³ + (1/x)³ + 3 × x × (1/x) × {x +(1/x)} = 8(P)³

Putting eq. (1) we get

⇒ x³ + (1/x)³ + 3 × 2P = 8(P)³

⇒ x³ + (1/x)³ = 8(P)³ – 6P

Dividing both sides by 2

{x³ + (1/x)³}/2 = {8(P)³ – 6P}/2

⇒ {x³ + (1/x)³}/2 = 4(P)³ – 3P

∴ The value of [{x³ + (1/x)³}/2] is 4(P)³ – 3P

Shortcut Trick

If x + (1/x) = k

Then {x³ + (1/x)³} = k³ – 3k

{x + (1/x)} = 2P

⇒ {x³ + (1/x)³} = 8(P)³ – 6P

Average of {x³ + (1/x)³} = {8(P)³ – 6P}/2

⇒ 4(P)3 – 3P

∴ The value of [{x3 + (1/x)3}/2] is 4(P)3 – 3P

Given:

5x² – 6x – 5 = 0

Calculation:

5x² – 5 = 6x

⇒ 5(x² – 1) = 6x

⇒ x² – 1 = 6x/5

Dividing x on both sides

⇒ x – (1/x) = 6/5

⇒ {x – (1/x)}² = 36/25

∴ The value of {x – (1/x)}² is 36/25.

Alternate Method

⇒ 5x2 – 6x – 5 = 0

divide the equation by 5:-

⇒ x² - (6x)/5 - 1 = 0

now divide the equation by x:-

x - (6/5) - 1/x = 0

⇒ x - 1/x = 6/5

⇒ (x - 1/x)² = 36/25

The correct answer is Hydrogel.

Contact lenses are normally made of Hydrogel.

Key Points

• Contact lenses we wear for better eyesight are made of a plastic material that is able to mix with the water in your eye.
• Each brand manufactures lenses that are made from different plastic materials but not the waste plastic which we use in our daily life but it is made up of  Hydrogel, Silicone Hydrogel, and Hypergel.

Important Points

• Silicone is the name used to describe plastic materials with a gel-like consistency that contains silicone, as well as oxygen, carbon, and other elements.
• It's an extremely flexible material, which makes it excellent for making contact lenses.

The correct answer is Sodium carbonate.

Key Points

• A toothpaste is defined as a semi-solid material for removing naturally occurring deposits from teeth and is supposed to be used simultaneously with a toothbrush.
• Toothpaste generally contains the following components:
• Water (20–40%)
• Abrasives (50%) including aluminum hydroxide, calcium hydrogen phosphates, calcium carbonate, magnesium carbonate, silica, and hydroxyapatite.
• Fluoride (usually 1450 ppm) mainly in the form of sodium fluoride.

The correct answer is Polo.

In the 15th century, Babur made the Polo game popular in India.

Key Points 

• India is said to have set a base for modern Polo.
• In the 15th century, Babur made the sport popular when he founded the Mughal Empire.
• Later on, the Britishers globalised the sport which was played in the various parts of India like Manipur, Jammu and Kashmir etc.

Additional Information

Karate:-

• Ancient India has been the origin of Judo Karate it was called Kalaripayate. The art has travelled to the east along with the Buddhist religion.
• Buddhist monks, who have travelled barefoot from India to the east to spread the gospel of Buddha, possess this skill. This technique of defence was very helpful for them as they travelled individually or in small groups.

Kabaddi:- 

• Kabaddi is a combative sport with seven players on each side. The game originated from Ancient India and the modern Kabaddi became popular in 1930.

Golf:-

• Golf in India was first played by Britishers. Since Golf is especially popular among the wealthier classes, it has not yet caught on with others due to the expenses involved in playing.

The correct answer is to act as the nominal head of the union territory.

Key Points

• Lieutenant Governor in India acts as the nominal head of the union territory.
• The Governors of the states of India have similar powers and functions at the state level as those of the President of India at the Union level.
• Governors exist in the states while lieutenant-governors or administrators exist in union territories.
• The governor acts as the nominal head whereas the real power lies with the Chief ministers of the states and his/her councils of ministers.
• Although, in UT’s, the real power lies with the lieutenant governor or administrator, except in NCT of Delhi and Puducherry where they share power with a council of ministers headed by a chief minister.
• In India, a lieutenant governor is in charge of a union territory. However, the rank is present only in the union territories of Andaman and Nicobar Islands, Ladakh, Jammu and Kashmir, Delhi, and Puducherry.
• However, the governor of Punjab acts as the administrator of Chandigarh.
• Lieutenant governors do not hold the same rank as a governor of a state in the list of precedence.
• The governors and lieutenant governors are appointed by the president for a term of five years.

Silicon is NOT correct.

• Silicon is not a form of carbon.

Key Points

• Carbon has the property of catenation which is absent in silicon.
• Catenation - Property to form a bond with itself. i.e carbon can form bonds with another carbon atom while silicon can't. (It can but to a lesser extent not as strong as carbon.)
• Pure silicon is too reactive to be found in nature, but it is found in practically all rocks as well as in sand, clays, and soils, combined either with oxygen as silica (SiO₂, silicon dioxide) or with oxygen and other elements (e.g., aluminium, magnesium, calcium, sodium, potassium, or iron) as silicates.

Additional Information

• Diamond is a well-known allotrope of carbon that exhibits hardness and high dispersion of light. It is the hardest known natural mineral and finds applications in cutting, drilling, and jewellery, and as a potential semiconductor material.
• Graphene is a single layer of carbon atoms arranged in one plane; layers of graphene make up graphite. Graphene is a material of interest due to its high electron mobility and its possible applications in electronics.
• Fullerenes are a class of carbon allotropes in which carbon takes the form of a hollow sphere, ellipsoid, or tube. This class of materials includes carbon nanotubes, buckyballs, and the newly discovered nanobuds.

The correct answer is Gol Gumbaj.

Key Points

• Gol Gumbaz is the most famous monument in Vijayapura located in Bijapur, Karnataka.
• It is the tomb of Mohammed Adil Shah (ruled 1627–1657). It is the second largest dome ever built, next in size only to St Peter's Basilica in Rome.
• A particular attraction in this monument is the central chamber, where every sound is echoed seven times.

Additional Information

• Buland Darwaza or the loft gateway at Fatehpur Sikri was built by the great Mughal emperor, Akbar in 1601. Akbar built the Buland Darwaza to commemorate his victory over Gujarat.
• The Ibadat Khana was a meeting house built in 1575 CE by the Mughal Emperor Akbar at Fatehpur Sikri to gather spiritual leaders of different religious grounds so as to conduct a discussion on the teachings of the respective religious leaders.
• Panch Mahal is a palace in Fatehpur Sikri, Uttar Pradesh, India. The Panch Mahal meaning 'Five level Palace' was commissioned by Akbar This structure stands close to the Zenana quarters which supports the supposition that it was used for entertainment and relaxation.

The correct answer is **Refractive index.**​

Key Points

• The ratio of the speed of light in a vacuum to the speed of light in a medium is called the refractive index.
• If i is the angle of incidence and r is the angle of refraction, then
• ${Sin\ i \over Sin\ r}= Constant$
• This constant value is called the refractive index of the second medium with respect to the first.
• The medium having a larger value of the refractive index is an optically denser medium than the other.
• The medium of the lower refractive index is optically rarer than the other.
• The speed of light is higher in a rarer medium than a denser medium.

Additional Information

The refractive index of some important mediums

Given:

Cost price of 40 apples = Selling price of 30 apples

Calculation:

Profit = Selling price – Cost price

Profit percentage = (Profit/Cost price) × 100

Calculation:

Let the cost price be CP

Let the selling price be SP

CP of 40 apples = SP of 30 apples

⇒ CP × 40 = SP × 30

⇒ CP × 4 = SP × 3

⇒ CP/SP = 3/4

In terms of ratio

CP : SP = 3 : 4

⇒ Profit = 4 – 3 = 1

⇒ Profit percent = 1/3 × 100 = 33.3%

∴ The profit percentage earned by shopkeeper is 33.3%.

The logic is:

A. Equator : Hot → Equator is hot.

B. Pole : Cold → Poles are cold.

C. River : Hot → Rivers are cold, not hot.

D. Winter : Cold → Winters are cold.

Hence, ‘River : Hot’ is the odd one out.

Given:

35% of 9/5 of a number = 252

Calculation:

Let the number be x

(35/100) × (9/5) × x = 252

⇒ (7/20) × (9/5) × x = 252

⇒ x = (252 × 20 × 5)/(7 × 9)

⇒ x = 4 × 20 × 5 = 400

∴ The number is 400.

Given:

A drug supervisor dismisses 0.05% of the drugs as defective drugs.

Concept Used:

The value = percentage%/100 × Total value

Calculation:

A drug supervisor dismisses 0.05% of the drugs as defective drugs.

Let the total tested drugs be x

Then, The drugs will tested to dismiss 4 drugs 

⇒ x × 0.05/100 = 4

⇒ x = 8000

∴ The drugs will tested to dismiss 4 drugs  is 8000.

Bridge is NOT correct.

• Among the options, only bridge is NOT a board game.

Key Points

• Bridge is a card game.
• Card games do not require a board to play.
• Bridge has been one of the most popular card games in the world since the 1930s.
• Bridge is played with four people sitting at a card table using a standard deck of 52 cards (no jokers).
• In a Bridge game, each player is dealt with 13 cards.
• Board games are tabletop games that typically use a board to play.
• Important examples of board games are:
• Snake and ladder.
• Battle Sheep.
• Chess.
• Checkers.
• Connect Four.
• Ludo.

The correct answer is Product.

Key Points 

• A geographical indication (GI) is a sign used on products that have a specific geographical origin and development.
• It enables those who have the right to use the indication to prevent its use by a third party whose product does not conform to the applicable standards.
• It is typically used for agricultural products, foodstuffs, wine and spirit drinks, handicrafts, and industrial products.
• GI tag confers legal protection to Geographical Indications in India.
• It prevents unauthorised use of a Registered Geographical Indication by others

Additional Information

• In India GI tag came into force with effect from 15^th September 2003.
• Darjeeling Tea was the first Indian product to get a GI tag.
• Some important examples of Geographic Indication are:
• Aranmula Kannadi(Kerala).
• Chanderi Sarees(Madhya Pradesh).
• Katarni Rice(Bihar).
• Kancheepuram Silk(Tamil Nadu).
• Kullu Shawl (Kullu Shawl).
• Kasuti Embroidery(Karnataka).
• Bastar Dhokra(Chhattisgarh).
• Kutch Embroidery(Gujarat).

The correct answer is Avoid catching fire.

Key Points

• Phosphorus is kept in water so that it avoids catching fire through contact from atmospheric oxygen.
• Phosphorus is the element that literally means "I carry light".
• Phosphorus is a chemical element with an atomic number 15.
• It was discovered by Hennig Brand in 1669.
• Phosphorus has the smell of garlic.
• Phosphorus is never found as a free element on earth due to its high reactivity.

Important Points​ 

• Elemental phosphorus exists in two different forms namely white phosphorus and red phosphorus.
• The element kept in water is white phosphorus.
• White phosphorus emits green light on the exposure to the atmosphere.
• White phosphorus burns in the atmosphere at 30º C.
• Red phosphorus is used for making safety matches.
• Phosphorus is used in the fertilizer industry.

Given equation: 81 H 1 G 17 F 102 G 6 F 34 H 6 

After replacing the letters by their meaning, we get:

81 - 1 ÷ 17 × 102 ÷ 6 × 34 – 6

= 81 – 34 – 6

= 81 – 40

= 41 

Hence, ‘41’ is the correct answer.

Encoding is the process of converting data from one format to another format and this transform data is also called coded data. There are many types of encoding process like placing the characters in the coded format in a sequence. This encoding also helps in program compilation and execution. But transformation of coded data is not the part of encoding.

Hence, option 3(B) is the odd on out.

Given:

Ritesh, Gaurav and Jugnu invest in the ratio 2 : 5 : 7.

The ratio of their investment return percentage is 5 : 3 : 2.

Gaurav earns more than Rs 150 from Ritesh.

Calculation:

Let the Ritesh, Gaurav and Jugnu invest be  2x, 5x, 7x.

The ratio of their investment return percentage is 5 : 3 : 2.

The profit of Ritesh = 2x × 5/100 = 1/10x

The profit of Gaurav = 5x × 3/100 = 3/20x

The profit of Jugni = 7x × 2/100 = 7/50x

The ratio of Ritesh, Gaurav and Jugnu profit = 1/10x : 3/20x : 7/50x

The ratio of Ritesh, Gaurav and Jugnu profit =10 : 15 : 14

According to the question:

Gaurav earns more than Rs 150 from Ritesh.

Then, 15 - 10 = 150 

⇒ 5 = 150 

⇒ 1 = 30

The total income = 30 × 39 = 1170

∴ The total income is Rs.1170.

According to the alphabetical positions of the letters,

Hence, ‘453435335’ is the correct answer.

Given:

The sum of the investment is Rs.1500.

The amount after two years is Rs.1800.

Formula Used:

SI = P ×  R × T/100

SI = Simple interest

P = Principal

R = Rate 

T = Time

Calculation:

Let the rate of interest be R.

SI = 1800 - 1500 = 300

Then, 1500 × R × 2/100 = 300

⇒ R = 10%

According to the question;

New rate of interest = 10 + 5 = 15%

New SI = 1500 × 15 × 2/100 = 450

The amount = 1500 + 450 = Rs.1950  

∴ The amount is Rs.1950.

Given:

The standard deviation of the population is 11.

Formula Used:

Variance = (Standard deviation)²

Calculation:

The standard deviation of the population is 11.

The Variance = (11)² = 121

∴ The Variance of the population is 121.

The correct answer is 37°C.

• The temperature of a human body is measured by using a thermometer.
• The thermometer that measures our body temperature is called a clinical thermometer.

Additional Information 

• The average temperature of a human body is 37 degrees Celsius.
• This is the reason why a clinical thermometer is made with a temperature range from 35°C to 42°C.
• The average temperature of a human body on a Fahrenheit scale is 98.6 degrees Fahrenheit.
• A clinical thermometer consists of a long, narrow, uniform glass tube.
• It has a bulb that contains mercury at one end.
• The clinical thermometer is designed to measure the temperature of the human body only.
• The range of a laboratory thermometer is generally from –10°C to 110°C.

Given:

The acid and water in the two containers are mixed in the ratio of 3 : 1 and 5 : 3 respectively.

The ratio of acid and water in the new mixture is 2 : 1.

Calculation:

The acid in the first mixture = 3/4

The acid in the second mixture = 5/8

The acid in the new mixture = 2/3

The ratio of the mixture = 1/24 : 1/12 = 1 : 2

∴ The ratio of the two mixture is 1 : 2.

Hub is software is NOT correct.

Key Points

• Hub is a device that is used to connect more than one computer together in a network.
• It is a physical layer networking device.
• It contains multiple ports.
• It operates in the physical layer of the OSI model.
• It takes data that comes from one channel and sends it out to all other channels on the hub.
• Hub is a common point of connecting in PC.
• It is generally used to connect computers in a LAN
• It is also known as a concentrator.

Given:

The product of Sapna and Anubha's age is 150.

4 times the age of Anubha is 10 years more than the age of Sapna.

Calculation:

Let the age of Sapna be x.

Let the age of Anubha be y.

According to the question;

The product of Sapna and Anubha's age is 150.

⇒ xy = 150

4 times the age of Anubha is 10 years less than the age of Sapna.

⇒ 4y = x - 10

⇒ x = 4y + 10

On putting the value of x

⇒ xy = 150

⇒ (4y + 10 )y = 150

⇒ 4y² + 10y -150 = 0

⇒ y = - 30/4 , 5

The age of Sapna  = 150/5 = 30 years

∴ The age of Sapna is 30 years.

 xy = 150 

and 4x = y - 10 

⇒ xy = 5 × 30 

Means x = 5 and y = 30 

Also 4 times of x = 20 is 10 less than y

So condition satisied

∴ The age of Sapna (y) = 30 years

Given:

The seller expects 32% return on his purchase price.

The seller sell in one day was 528.

Concept Used:

Purchase price = 100/(100 + Return%) × Selling price

Calculation:

The seller expects 32% return on his purchase price.

The seller sell in one day was 528.

The purchase price = 100/(100 + 32) × 528 = 100/132 × 528 = 400

The profit amount = 528 - 400 = Rs.128

∴ The profit amount is Rs.128.

Given:

The number of fiction literature books of branch I = 130

The number of science books of branch I = 260

The number of IT books of branch II = 280

The number of history books of branch II = 210

Calculation:

The total number of required books of branch I = 130 + 260

⇒ The total number of required books of branch I = 390

The total number of required books of branch II = 280 + 210

⇒ The total number of required books of branch II = 490

Required difference = 490 - 390

⇒ Required difference = 100

∴ The required difference is 100.

Given:

The number of science books of branch I = 260

The number of books of fiction literature of branch II = 70

Calculation:

Required ratio = The number of science books of branch I ∶ The number of books of fiction literature of branch II

⇒ Required ratio = 260 ∶ 70

⇒ Required ratio = 26 ∶ 7

∴ The required ratio is 26 ∶ 7.

Given:

Number of history book in branch III = 60

Total history book = 195 + 210 + 60 = 465

Calculation:

Average of history book = 465/3

⇒ Average = 155

Required difference = Average - history book in branch III 

⇒ Required difference = 155 - 60

⇒ Required difference = 95

∴ The history books of branch III is 95 less than the average number of history books of all the three branches.

Given:

f(x) = 3x4 - (a + 2)x3 - x2 - 4 

p(x) = (x - 2)

Concept used:

Using concept of factor theorem,

If (x - a) is a factor of f(x), then f(a) = 0

calculation:

(x - 2) is factor of f(x) = 3x4 - (a + 2)x3 - x2 - 4 

using factor theorem,

f(2) = 0

⇒ 3 × 24 - (a + 2) × 23 - 22 - 4 = 0

⇒ 3 × 16 - (a + 2) × 8 - 4 - 4 = 0

⇒ 48 - 8a - 16 - 4 - 4 = 0

⇒ -8a = -24

⇒ a = 3

∴ The value of a is 3.

The least possible Venn diagram is:

A. At least one circle is square. → False (As, there is no definite relation between circle and square. Hence, false)

B. All rectangles are hexagons. → False (As, each hexagon is a rectangle → Some rectangles are hexagons)

C. There is at least one hexagon that is square. → False (As, there is no definite relation between hexagon and square. Hence, false)

D. At least one rectangle is square. → True (As, some squares are rectangles)

Hence, ‘D’ is the correct answer.

The logic is:

Pressure : Barometer → A barometer is a scientific instrument that is used to measure air pressure.

Similarly,

1. Ammeter is used to measure current.
2. Pyrometer is used to measure temperature.
3. Seismograph is used to detect and record earthquake.
4. Odometer is used to measure distance travel by vehicle.

Hence, ‘Liquid Density : odometer’ is the correct answer.

The correct answer is Mohiniattam.

• Among the options, only Mohiniattam is NOT a folk dance.

Key Points

• Mohiniattam is one of the classical dance forms in India.
• Mohiniattam is originated from the state of Kerala.
• Mohiniyattam derives its name from the word ‘Mohini’, a female avatar of Lord Vishnu
• It is performed by women in honor of the Hindu god Vishnu in his incarnation as the enchantress Mohini.
• Music for Mohiniattam is provided by a Karnatak (South Indian) classical music ensemble.
• It follows two performance categories namely, ‘Nritta’ and  ‘Nritya’ mentioned in ‘Natya Shastra’.
• Mohiniattam was patronized by Travancore ruler Maharaja Swathi Thirunal.
• Vallathol Narayana Menon is the poet who revived Mohiniattam.
• The main exponents of Mohiniattam are:
• Kalamandalam Kalyanikutty Amma.
• Sunanda Nair.
• Gopika Varma.
• Pallavi Krishnan.

Additional Information

• Lavani is a folk dance in Maharashtra.
• Kalbelia is a folk dance in Rajasthan.
• Rouff is a folk dance in Jammu and Kashmir.
• Important folk dance of India are:
• Bihu,
• Bichhua.
• Natpuj.
• Nautanki.
• Raslila.
• Parichakali.
• Jhora.

By using the symbols in the table given below, we can draw the following family tree:

S is either grandson or granddaughter of K.

The definite relation between S and K cannot be determined as gender of S is not given.

Hence, ‘Cannot be determined’ is the correct answer.

Given:

Mean distribution = 80

Standard deviation = 16

Formula Used:

Coefficient variation = (Standard deviation ÷ Mean) × 100

Calculation:

Coefficient variation = (16 ÷ 80) × 100

⇒ (1/5) × 100 = 20

∴ Variance coefficient = 20%

Conclusion I follows. (As, in the digital age the use of computers and smartphones have increased and these devices are involved in the production of greenhouse gases which is harmful to humanity)

Conclusion II follows. (As, the manufacture and use of computers, smartphones etc. are also involved in the production of greenhouse gases)

Hence, Both I and II follow.

The given equation is:

1093 × 1093

⇒ The square of 1093 is 1194649

∴ The correct answer is option A.

Given:

Investment of Rupal = Rs.15000

Time period of Rupal = 4 months

Investment of Shanu = Rs.10000

Time period of Shanu = 3 months.

Calculation:

⇒ Ratio of Rupal : Shanu

⇒ 150000 × 4 : 10000 × 3

⇒ 2 : 1

⇒ Share of Rupal = (2/3) × 90000 = Rs.60000

∴ Share of Rupal in total profit = Rs.60000.

Persons - P, Q, R, S and T are sitting facing you in a row. 

1. S is just after T.
2. R is second from the right and after Q.
3. P is at the last place and after T.

S is in the middle.

Hence, ‘S’ is the correct answer.

Persons - P, Q, R, S and T are sitting facing you in a row. 

1. S is just after T.
2. R is second from the right and after Q.
3. P is at the last place and after T.

T is second from the left.

Hence, ‘T’ is the correct answer.

Persons - P, Q, R, S and T are sitting facing you in a row. 

1. S is just after T.
2. R is second from the right and after Q.
3. P is at the last place and after T.

Q is at the right end.

Hence, ‘Q’ is the correct answer.

Given:

(P + Q)'s 1 day's work = 1/12

(Q + R)'s 1 day's work = 1/15

(R + P)'s 1 day's work =  1/20

Calculation:

2 (P + Q + R)'s 1 day's work = (1/12) + (1/15) + (1/20)

⇒ (5 + 4 + 3)/60 = 1/5

⇒ (P + Q + R)'s 1 day's work 2 × (1/5) = 1/10

∴ They can complete the work in 10 days.

The correct answer is Africa.

Key Points 

• Victoria Waterfalls is a fall located on the borders of Zambia and Zimbabwe in Africa
• Victoria Waterfalls are located in Africa.
• It is located on the Zambezi river.
• It was named after Queen Victoria.
• It is the only waterfall in the world with a length of more than a kilometer and a height of more than a hundred meters.
• It was designated as a World Heritage site in 1989.
• It is a Cataract type waterfall.
• The highest waterfall is Angel falls of Venezuela in South America.
• Niagara falls located on the border between Canada and the USA in North America.

Additional Information 

The logic is:

Miser : Spendthrift → Both the words are antonyms of each other.

Similarly,

Night : _____ → Night is antonym of Day.

Hence, ‘Day’ is the correct answer.

Given: Four sons and an unmarried daughter live with their parents. A son has a daughter and a son. Each of the other sons has 2 daughters. 

3 sons has 2 daughter,

Therefore number of  female = 6

One son has one daughter and one son,

Number of female = 1

Four sons and an unmarried daughter live with their parents,

So, total number of female = 6 + 1 + 1(mother) + 1(unmarried daughter) = 9

Hence, number female member are 9.

A. Protection of forests is needed for tigers to survive. → True (As, the forests are important for the survival of these predators)

B. Poaching is a threat to tiger conservation. → True (As, tiger areas should also be protected from hunters. The forest department should establish preventive measures to stop poaching.)

C. Wild tigers are in small numbers. → False (As, these will help in maintaining their numbers in the forest. The statement does not suggests or implies if wild tigers are in small numbers)

D. Tigers are at the top of the food chain. → True (As, The tiger is the apex predator of the Indian forests. He is at the top of the food chain)

hence, 'C' is the correct answer.

Given:

Mean of 19 observation = 13

After adding 3 more observation new mean becomes 13.5

Calculation:

Sum of all observations =  19 × 13 = 247

After adding 3 more observation total observation = 19 + 3 = 22

Now, sum of 22 observation = 22 × 13.5 = 297

Sum of new observation = 297 - 247 = 50

Mean of 3 new observations = 50/3 = 16.66

The correct answer is NCR Region.

Key Points

• Okhla Bird Sanctuary is located in the NCR region.
• Okhla Bird Sanctuary is officially known as Shaheed Chander Shekhar Azad Sanctuary.
• It is one among 15 bird sanctuaries in the state.
• It was notified as a bird sanctuary in the year 1990.
• It is located on the banks of the river Yamuna.
• At present, it is one of the 466 IBAs (Important Bird Areas) in India.
• Okhla Bird Sanctuary is the home for around 300 different species of birds.

Additional Information 

Given:

In 1st case when bus runs at 80km per hour it reaches its destination 40 minutes late

In 2nd case when bus runs at 90km per hour it reaches its destination only 8 minutes late.

Formula used:

Time = Distance/speed

Calculation:

Let the correct time for the train to complete the journey is X minutes.

Then the train cover distance in X + 40 minutes at speed 80 km per hour

⇒ 80 × (X + 40)/60  

Now the train cover X + 8 minutes at speed 90km per hour 

⇒ 90 × (X + 8)/60

Now,  

80 × (X + 40)/60 = 90 × (X + 8)/60 ​

⇒ 80X + 3200 = 90X + 720

⇒ 10X = 2480

⇒ X = 248

∴ The correct answer is 248 min.

The correct answer is Rakesh Sharma.

Key Points

• Rakesh Sharma is the first Indian to enter space.
• He was selected as a cosmonaut for a joint Soviet-Indian spaceflight in 1982.
• He made history by becoming the first Indian to travel to space in 1984.
• He flew on Soyuz T-11 with commander Yury Malyshev and flight engineer Gennady Strekalov, to the space station Salyut 7 on 3^rd April 1984.
• Rakesh Sharma and his crewmates landed in Kazakhstan on 11^th April 1987 after the successful completion of the mission.
• He is the only Indian citizen to travel in space.

Additional Information

• Kalpana Chawla was the first Indian-origin woman to enter space.
• She was killed in the space shuttle Columbia disaster on 1st February 2003.
• Sunita Williams is the second Indian-origin woman to enter space.
• The first marathon in space was run by Sunita Williams.
• Yuri Gagarin is the first man to enter space.
• Ravish Malhotra was an Air Force test pilot in India. 
• He served as a backup for Rakesh Sharma on the Soyuz T-11 mission.

The correct answer is Leonardo DiCaprio.

Key Points

• The 88th Academy Awards ceremony honored the best films of 2015.
• It was presented by the Academy of Motion Picture Arts and Science.
• Academy Awards is popularly known as the Oscars.
• It took place on 28^th February 2016 in Los Angeles.
• Leonardo DiCaprio won the best actor award.
• Leonardo DiCaprio is an American actor.
• It was his first win after 5 previous nominations spanning 2 decades.
• He won this award for his performance in "The Revenant".
• He also won a BAFTA, and a Golden Globe Award for his performance in "The Revenant".
• He has won 99 awards from 248 nominations in his career.

Additional Information 

• Alejandro G. Inarritu won the Best Director award for his movie "The Revenant".
• Brie Larson won Best Actress for her performance in "Room".
• "Spotlight" won the Best Picture award in 88th Academy Awards.
• Michael Fassbender, Eddie Redmayne, and Bryan Cramston are the other three nominations for the best actor award in 88th Academy Awards.

The correct answer is All these are good conductors.

• Silver, copper, gold, and aluminum are examples of metals.
• All these four metals are good conductors.
• Among these only gold and silver are precious metals.
• Gold is a chemical element with an atomic number 79.
• Gold is also called the "king of metals".
• The melting point of gold is 1064°C
• Gold is used to make ornaments.
• Pure gold is 24 carat.
• Silver is a chemical element with an atomic number 47.
• Silver is the best conductor of electricity.
• Gold and silver can be separated by the cyanide process.
• Copper is a chemical element with an atomic number 29.
• Copper is the first metal used by man.
• Copper is the metal used in gold ornaments.
• Aluminum is a chemical element with an atomic number 13.
• It was first isolated by Hans Oersted.
• Commercially Aluminum is extracted from Bauxite.

Given:

2, 6, 12, 20, 30, 42, 56, ?

Calculation:

⇒ 2 + 4 = 6

⇒ 6 + 6 = 12

⇒ 12 + 8 = 20

⇒ 20 + 10 = 30

⇒ 30 + 12 = 42

⇒ 42 + 14 = 56

⇒ 56 + 16 = 72

∴ The value of ? is 72.

The logic is:

Similarly,

Hence, ‘PANCATI’ is the correct answer.

The correct answer is Gujarat.

Key Points

• Somnath temple is one of the twelve Aadi Jyotirlingas of India.
• It is located at Veraval in Gujarat.
• It is believed to be the first among the Aadi Jyotirlingas in India.
• It is also mentioned in Rigveda.
• It was reconstructed many times in the past due to the repeated destruction by several invaders and rulers.
• The present form of the Somnath temple was reconstructed in the Chaulukya style of Hindu temple architecture during 1951.
• The reconstruction work was started under the orders of then Home Minister Vallabhbhai Patel.
• Mahmud Ghazni from Afghanistan invaded and looted the Somnath temple in 1024.​

​​

Additional Information

Given:

The LCM of two numbers is 6 times their HCF.

One of them is 45 and the sum of HCF and LCM is 315.

Formula used:

LCM × HCF = N₁ × N₂

LCM = least common factor, HCF = Heighest common factor

N₁ = first number, N₂ = second number

Calculation:

According to the question,

N₁ = 45

LCM = 6 HCF

LCM + HCF = 315

⇒ 6 × HCF + HCF = 315

⇒ 7 HCF = 315

⇒ HCF = 315/7

⇒ HCF = 45

⇒ LCM = 6 × HCF 

⇒ LCM = 6 × 45 = 270

Then,

LCM × HCF = N₁ × N₂

⇒ 270 × 45 = 45 × N₂

⇒ N₂ = 270

∴ The other number is 270.

We keep pen in a box and box is called pen.

So, according to code, we keep pen in a 'pen'.

Rubber → Box

Box → Pen

Pen → Pencil

Rub → Eraser.

Hence, 'Pen' is the correct answer.

The Act covered 20 years from 1919 to 1939 is NOT correct.

• The Government of India Act 1919 is popularly called Montague- Chelmsford reforms.
• The Act came into force in 1921.
• The Act had a separate preamble.
• This Act has made the Central Legislature liable.
• The Act has provided for the establishment of the Public Service Commission in India in 1926.
• The Act introduced dyarchy in provinces.
• The Act provided the right to vote for women in India.
• The Act divided the provincial subjects into transferred and reserved.

Conclusion I follows from statement 2.

"cows and buffaloes living in very unhealthy conditions' implies that the welfare of milking animals is equally important.

Conclusion II follows from statement 1.

A lot of efforts are made to test milk for the supply of public implies sources supplying milk remain highly contaminated.

Hence, both I and II follow.

The correct answer is 36.

Key Points

• Mukesh Ambani is an Indian billionaire businessman.
• He is the chairman, managing director of Reliance Industries Ltd.
• He was ranked at 36^th position in the Forbes 2016 list of the world's billionaires.
• He retained his position as India's richest person.
• As of 28 December 2020, he is the 14th richest in the world.

Important Points 

• Mukesh Ambani was followed by Indian pharma magnate Dilip Shanghvi.
• According to the 2016 Forbes World's Billionaires List, the total number of billionaires worldwide is 1,810.
• Co-founder of Microsoft Corporation, Bill Gates became the worlds richest businessman in Forbes 2016 world's billionaires list.
• The list consists of 84 Indian billionaires.

The correct answer is Aqua Regia.

Key Points

• Aqua Regia is the liquid in which noble metals are soluble.
• It can dissolve gold. platinum etc.
• It is also known as 'royal water'.
• Aqua Regia is prepared using the mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of 3:1.
• It is a highly corrosive, fuming liquid.
• It is mainly used for the manufacture of chloroauric acid.
• The first recorded batch of aqua regia was prepared by Jabir ibn Al-Hayyan.

Additional Information

• Glycerin is used in film industries to avoid the quick drying of wet areas.
• Methanol is the simplest form of alcohol.
• Alcohol poisoning is due to the presence of methanol.