RRB NTPC CBT 1 2016: questions with answers

The Faqir–Sanyasi, Indigo (1859–60) and Santhal (1855–56) rebellions were uprisings against British rule and the exploitation it allowed. The Naxalbari uprising of 1967 in West Bengal took place after independence, against landlords, so it was not against British restrictions.

Roger Federer, winner of 20 Grand Slam singles titles, represents Switzerland. He also won Olympic doubles gold (2008) and the 2014 Davis Cup for Switzerland.

Arrange the seven round the circle (facing the centre, a person's left is the clockwise neighbour). Starting with Ragini and going clockwise, the order is Ragini, Rakhi, Reema, Renu, Rekha, Rashmi, Radha; this satisfies every condition. Reema sits immediately to the left of Rakhi.

In the order Ragini, Rakhi, Reema, Renu, Rekha, Rashmi, Radha (clockwise, which is each person's left), the person second to the left of Ragini is Reema.

In the arrangement Ragini, Rakhi, Reema, … Rakhi sits between Ragini and Reema, so 'Rakhi–Ragini–Reema' has the first person between the other two.

Common table salt is sodium chloride (NaCl). Sodium fluoride is used in toothpaste and sodium hydroxide is caustic soda.

From 39574 = XPLMD: 3 = X, 9 = P, 5 = L, 7 = M, 4 = D. From 0826 = TBNQ: 0 = T, 8 = B, 2 = N, 6 = Q. So DBMTX = 4, 8, 7, 0, 3 = 48703.

The pancreas is both an exocrine gland, secreting digestive enzymes (amylase, lipase, trypsin) into the intestine, and an endocrine gland, whose islets of Langerhans secrete the hormones insulin and glucagon.

Dari, the Afghan variety of Persian, is one of Afghanistan's two official languages, along with Pashto.

The official key marks Hardeep Singh Puri, who was Minister of State (Independent Charge) for Commerce and Industry in 2019–2021. Such 'current minister' answers change over time; the post has since been held by others.

Villages depend heavily on ponds, rivers and wells, which are often contaminated by sewage, open defecation, animal waste and farm chemicals. So water pollution, and the diseases it spreads, is the most widespread problem in rural India.

w − z = −2 − (−1/2) = −3/2. Then 2x(w − z) = 2 × 3 × (−3/2) = −9.

India House (London, 1905), the Ghadar Party (San Francisco, 1913) and the Berlin Committee (1914) were set up abroad to support the freedom struggle. The Hindustan Socialist Republican Association was founded in India, at Delhi's Feroz Shah Kotla in 1928, by Bhagat Singh and others.

The numbers are 4 × 11 = 44 and 9 × 11 = 99. Since 4 and 9 have no common factor, LCM = 11 × 4 × 9 = 396.

The Iron Pillar at the Qutub complex, Delhi, dating from the Gupta period (about 4th–5th century AD), is made of wrought iron. A thin protective layer of iron hydrogen phosphate, helped by its high phosphorus content, keeps it from rusting.

Interchanging + and ÷ gives 15 ÷ 3 × 9 − 4 + 16. Working it out: 15 ÷ 3 = 5, 5 × 9 = 45, then 45 − 4 + 16 = 57, which matches.

The loudness (intensity level) of sound and noise is measured in decibels (dB). Hertz measures frequency, the ohm resistance and the volt potential difference.

India is a sovereign country, free to make its own decisions, and its Parliament is indeed in New Delhi. But having its Parliament in Delhi has nothing to do with being sovereign, so R does not explain A.

The statement only says domestic demand is growing faster than domestic crude production. It does not say oil 'must' be imported, nor that demand 'must' be reduced; the gap could be met in other ways (alternative fuels, efficiency). Neither conclusion is a definite inference.

The two holes empty 1/15 + 1/20 = 7/60 of the jug per minute together. So they empty it in 60/7 = 8 4/7 minutes.

Sharad's son's paternal grandfather is Sharad's father. Meena is his only sister, so she is Sharad's father's sister, i.e. Sharad's paternal aunt.

Diagonal = √(9² + 6²) = √(81 + 36) = √117 = 3√13 cm. A length cannot be negative, so ± options are wrong.

Degradation of the environment has caused biodiversity loss, higher CO₂ in the air and greater UV exposure (through ozone depletion). Landfills are a waste-disposal method created by people, not a result of environmental degradation.

3 min 30 s = 210 s costs Rs 10, so the rate is 10/210 per second. 4 min 10 s = 250 s costs 250 × 10/210 ≈ Rs 11.9.

The Satish Dhawan Space Centre, ISRO's main launch base, is at Sriharikota in Nellore district, Andhra Pradesh. It was renamed in 2002 after former ISRO chairman Satish Dhawan.

Laser surgery is called bloodless surgery because the laser beam cuts tissue and at the same time seals (cauterises) small blood vessels, so there is very little bleeding.

Working left to right: 35968 ÷ 562 = 64, and 64 ÷ 8 = 8.

Walking both ways takes 11 h 12 min, so walking one way takes 5 h 36 min. Walking one way plus riding back takes 9 h 15 min, so riding one way = 9 h 15 min − 5 h 36 min = 3 h 39 min. Riding both ways = 2 × 3 h 39 min = 7 h 18 min.

Truck Q travelled 302 km on Friday in 8 hours. Average speed = 302/8 = 37.75 km/h.

Truck S travelled 325 + 314 + 312 + 278 + 292 + 274 = 1,795 km over six days. Average = 1795/6 km per day (≈ 299.2 km).

On Saturday: 292 + 284 + 260 + 274 + 280 + 242 = 1,632 km.

Chip packets are flushed with nitrogen, an unreactive gas, to push out oxygen. Without oxygen the fats in the chips cannot oxidise and turn rancid, and the gas also cushions the chips.

A 15% loss means SP = 85% of CP, so CP = 3400/0.85 = Rs 4,000. For a 15% profit, SP = 4000 × 1.15 = Rs 4,600.

TRACTER and TROLLEY each have 7 letters and are coded 14, i.e. twice the number of letters. SCOOTER also has 7 letters, so it is 14.

Lungs are the breathing organs of man; gills are the breathing organs of fish.

The ratio 1 : 2 : 4 : 5 has 12 parts, so one part = 156/12 = Rs 13. The shares are 13, 26, 52 and 65.

From A's total, 33 = 21 (only A) + (10 − x) + (8 − x) + x, so x = 6 passed all three. Exactly two sections: (10 − 6) + (9 − 6) + (8 − 6) = 9. One or more sections = 63 (only one) + 9 + 6 = 78. Ratio to 'Section A alone' (21) = 78/21.

Section A: 33 = 21 + (10 − x) + (8 − x) + x = 39 − x, so x = 6. (Check with B: 21 + (10 − 6) + (9 − 6) + 6 = 34.) So 6 passed all three sections.

21 students passed each section alone, so those who passed only one section = 21 × 3 = 63.

Floppy disks, which held only about 1.44 MB, have become obsolete, replaced by CDs/DVDs, pen drives and cloud storage. Pen drives, hard disks and (to a lesser extent) CDs are still in use.

Water is essential for life, so the assertion is true. But a water molecule (H₂O) has two hydrogen atoms and one oxygen atom, not three hydrogen, so the reason is false.

Division first: 7497 ÷ 147 = 51. Then 51 − 8 = 43.

The Bhimbetka rock shelters, with prehistoric cave paintings, are in Raisen district of Madhya Pradesh, near Bhopal. They are a UNESCO World Heritage Site.

With ÷ → ×, − → +, + → ÷ and × → −, the expression 19 ÷ 9 × 51 − 171 + 19 becomes 19 × 9 − 51 + 171 ÷ 19. Multiplication and division first: 171 and 9. Then 171 − 51 + 9 = 129.

The Hubble Space Telescope is run by NASA (USA) with the European Space Agency. In 2015 it photographed the predicted reappearance of Supernova Refsdal, whose light had been split by gravitational lensing.

In decimals, 2/7 ≈ 0.286, 0.3 and 3/7 ≈ 0.429. So the ascending order is 2/7, 0.3, 3/7.

Dr. L. Subramaniam is a celebrated Indian violinist, known for both Carnatic classical music and fusion with Western music. He received the Padma Bhushan in 2001.

India has the longest written constitution of any country. When adopted it had 395 articles, 22 parts and 8 schedules, and it is very detailed because it covers the Union, the States, rights, duties and administration together.

Let each of the three equal parts be d km. Time = d/3 + d/5 + d/8 = d(40 + 24 + 15)/120 = 79d/120 hours, and 39.5 min = 79/120 hour. So d = 1 km and the total distance = 3 × 1 = 3 km.

Swapping − ↔ × and 7 ↔ 3 turns option C, 3 − 7 × 1 = 20, into 7 × 3 − 1 = 20, which is true (21 − 1 = 20). The other options are false after the same swaps.

The Golden Glove is the FIFA World Cup award for the best goalkeeper. The Golden Ball goes to the best player and the Golden Boot to the top scorer.

An editor is in charge of a magazine; a director is in charge of a drama (play), guiding its actors and production.

MOST (Microvariability and Oscillations of STars), launched in 2003, was Canada's first space telescope. Nicknamed the 'Humble Space Telescope', it studied tiny brightness changes in stars.

The letters of 'saltoteuk' can be split into LOTUS (a flower) and TEAK (a tree). Their first letters are L and T, so the answer is LT.

TIGER written backwards is REGIT, so the code reverses the word. LEOPARD reversed is DRAPOEL.

At the Triveni Sangam in Prayagraj (Allahabad), the visible Ganga and Yamuna are believed to meet the mythical Saraswati, which is said to flow underground.

Amount after 2 years = 3500 × (1.04)² = 3500 × 1.0816 = Rs 3,785.60. The compound interest is the amount minus the principal: 3785.60 − 3500 = Rs 285.60.

Reema's son's paternal grandfather is Reema's father-in-law, and his only daughter-in-law is Reema herself. Reema's father's father is her paternal grandfather, so the man in the painting is Reema's paternal grandfather.

Compounded quarterly at 20% p.a., the rate is 5% per quarter, and 6 months is 2 quarters. Amount = 10000 × (1.05)² = 10000 × 1.1025 = Rs 11,025.

In November 2015 the Government raised the foreign direct investment limit for news and current-affairs TV channels from 26% to 49% (through the government route).

The Sundarbans, in the Ganga–Brahmaputra delta of India and Bangladesh, is the world's largest single block of tidal halophytic (salt-tolerant) mangrove forest and home to the Royal Bengal tiger.

Nanotechnology works with materials at the scale of about 1 to 100 nanometres (1 nm = one-billionth of a metre), manipulating individual atoms and molecules.

Standard deviation is the positive square root of variance: √144 = 12. It cannot be negative, so ±12 is wrong.

Cheating by 9% while buying, he gets 109 g for the price of 100 g; cheating by 9% while selling, he charges for 109 g but gives only 100 g. The combined gain = 1.09 × 1.09 − 1 = 0.1881 = 18.81%.

Friction acts when surfaces slide against each other: a washing machine pushed on a floor, a sled on snow and a person on a slide all involve it. Lifting a heavy object straight up is working against gravity, not friction, so it is the wrong example.

With sin x = 4/5, cos x = 3/5, so tan x = 4/3. tan x / cot x = tan² x = (4/3)² = 16/9.

India's first jute mill was set up in 1855 at Rishra near Kolkata, Bengal, on the Hooghly. Bengal (now West Bengal) remains the centre of the jute industry.

A .css file is a Cascading Style Sheet that controls how HTML (hypertext) web pages look: colours, fonts and layout. So it is a hypertext-related file.

The exterior angles of any polygon add up to 360°. With each exterior angle 45°, the number of sides = 360/45 = 8 (an octagon).

The two selling prices are 102% and 114% of the cost price. Their ratio = 102 : 114 = 17 : 19. (The Rs 3 difference would fix the actual cost, but is not needed for the ratio.)

Interchanging − with × and 5 with 14 turns 5 + 4 ÷ 2 − 8 × 14 into 14 + 4 ÷ 2 × 8 − 5. Then 4 ÷ 2 = 2 and 2 × 8 = 16, so 14 + 16 − 5 = 25.

Homo naledi, a new species of ancient human relative, was announced in September 2015 from fossils found in the Rising Star cave system in South Africa. It was the most recently discovered link in human evolution when this question was set.

An aquarium contains living organisms (fish, plants, microbes) interacting with non-living parts (water, light, gravel), so it is an ecosystem. Because people build and maintain it, it is a human-made (artificial) ecosystem.

When dividing powers of the same base, subtract the exponents: 2⁴ ÷ 2⁻¹ = 2^(4 − (−1)) = 2⁵ = 32.

x = 0.0236363… with '36' repeating. Then 10000x = 236.3636… and 100x = 2.3636…, so 9900x = 234 and x = 234/9900 = 13/550.

Genetic engineering is also called recombinant DNA technology: DNA from different sources is cut and joined to create new combinations, as when the human insulin gene is put into bacteria.

The mode is the most frequent value. In the data, 4 appears twice and every other value once, so the mode is 4.

Mouma Das and Soumyajit Ghosh are Indian table tennis players from West Bengal who have represented India at the Olympics and Commonwealth Games.

54367 × 9999 = 54367 × (10000 − 1) = 543,670,000 − 54,367 = 543,615,633.

HIV spreads through infected body fluids: unprotected sex, shared needles, infected blood, and from mother to child (including breastfeeding). It is not spread by mosquito bites, because the virus cannot survive or multiply in mosquitoes.

One climbs a tree; similarly one ascends a cliff. Both pairs link going up with the thing that is gone up.

A roster is a list of duties (who works when); an inventory is a list of goods held in stock.

Dipti's mother's father is her maternal grandfather, and his only granddaughter is Dipti herself. Yuvraj is the cousin of Dipti's son, i.e. the son of Dipti's brother or sister, which makes him Dipti's nephew.

A rhombus looks the same after a rotation of 180° and 360° about its centre, i.e. twice in a full turn. So its order of rotational symmetry is 2.

Soviet cosmonaut Yuri Gagarin became the first human in space on 12 April 1961, orbiting the Earth once in Vostok 1. Valentina Tereshkova was the first woman (1963) and Neil Armstrong the first on the Moon (1969).

In 2015 Arnold Schwarzenegger was reported to be in talks to play the villain in Rajinikanth's Enthiran 2 (2.0), and the official key marks him. The role finally went to Akshay Kumar.

Expand: 3x(x − 4) = 3x² − 12x. Then 7x + 3x² − 12x = 3x² − 5x.

Product of two numbers = HCF × LCM. So LCM = 3192/56 = 57.

Galvanised iron is iron or steel coated with a thin layer of zinc. The zinc protects the iron from rusting, even if scratched, because zinc corrodes first.

Ships float because of Archimedes' principle: an object in a fluid feels an upward buoyant force equal to the weight of fluid it displaces. A ship's hollow hull displaces enough water to balance its weight.

Mean = (2 + 9 + 9 + 3 + 6 + 9 + 4)/7 = 42/7 = 6. Absolute deviations: 4, 3, 3, 3, 0, 3, 2, which add to 18. Mean deviation = 18/7.

Let Tarun do 1 unit a day and Prashanth 2. Together they do 3 units a day for 21 days, so the work is 63 units. Tarun alone needs 63 days.

Statement A says full effort by all players guarantees a win; it does not say a win is possible only with full effort. Knowing the match was won therefore doesn't tell us whether all players gave their best (assuming so is the error of affirming the consequent), nor that some didn't. Neither conclusion definitely follows.

Long before the East India Company gained power, India was famous worldwide for fine cotton textiles (such as Dhaka muslin and calicoes) and silk fabrics, which were exported to Asia, Africa and Europe.

COUNTER → NTERCOU moves the last four letters (NTER) before the first three (COU). ANALOGY → LOGY + ANA = LOGYANA.

tan(A + B) = (tan A + tan B)/(1 − tan A tan B). Numerator: 15/8 + 7/24 = 45/24 + 7/24 = 52/24. Denominator: 1 − (15/8)(7/24) = 1 − 105/192 = 87/192. So tan(A + B) = (52/24) × (192/87) = 416/87.

The Right to Property was removed from the list of Fundamental Rights by the 44th Amendment (1978). It is now a legal right under Article 300A. Equality, freedom of religion and the right against exploitation are still Fundamental Rights.

Bees, termites and ants are social insects: they live in organised colonies with division of labour (queens, workers, soldiers). Crickets live solitary lives, so they are not social insects.

Add 7 to both sides: −4 + 7 = 3x, so 3 = 3x and x = 1.

Nuclear fission does release huge energy, and splitting a heavy nucleus into two parts is the definition of fission, so both are true. But the definition does not explain why energy is released; that comes from the mass defect converted to energy by E = mc². So R is not the explanation of A.