RRB NTPC CBT 1 2016: questions with answers

Tuberculosis, chickenpox and measles spread through the air via droplets from coughing and sneezing. Hepatitis B spreads through infected blood and body fluids (unsafe injections, transfusions, sexual contact, mother to child), not through the air.

All dinosaurs are extinct, and a species that is already extinct cannot be critically endangered. So 'No dinosaurs are critically endangered' follows. The statements do not link dinosaurs with mammals or reptiles, and only some reptiles are said to be endangered.

Allergy blood tests measure IgE antibodies to allergens, using methods such as RAST and ELISA. Haemoglobin A1C (HbA1c) measures average blood sugar over about three months and is a diabetes test, not an allergy test.

The Yamuna, Gomti and Kosi are tributaries of the Ganga. The Manas flows from Bhutan into Assam and joins the Brahmaputra, so it is not a Ganga tributary.

6 times the number is 6 less than 60, i.e. 6x = 54. So x = 9.

Length = 1.12 × breadth, so area = 1.12b² = 448, which gives b² = 400 and b = 20 m (length 22.4 m).

A mirage forms on hot days when air near the ground is hotter and less dense than the air above. Light from the sky bends more and more as it passes through these layers, until it undergoes total internal reflection and reaches the eye from below, looking like water.

Resolution and determination are synonyms (firm decision). The synonym of consensus (general agreement) is unanimity.

Totals across the three towns: Cycle 150 + 115 + 150 = 415, Taxi 405, Rickshaw 300, Bus 375, Own car 400, Train 410. Cycle has the most people (415), so it is the most preferred mode.

Train + bus = 410 + 375 = 785 people. Taxi + own car = 405 + 400 = 805 people. So 805 − 785 = 20 fewer people prefer train and bus.

Taxi total = 155 + 100 + 150 = 405 and own car total = 125 + 175 + 100 = 400. The difference is 5.

In 1930, C. Rajagopalachari (Rajaji) led the Salt Satyagraha in Tamil Nadu, marching from Tiruchirappalli to Vedaranyam on the coast to break the salt law, in parallel with Gandhi's Dandi March.

Bulb filaments are made of tungsten, and it is chosen because of its very high melting point (about 3,422 °C), which lets it glow white-hot without melting. So R correctly explains A.

The Esc (Escape) key cancels or exits: it closes dialog boxes and drop-down lists and cancels commands. To run a selected command you press Enter, not Esc.

Multiply the ratio 2/3 : 3/4 : 1/2 by 12 to clear fractions: 8 : 9 : 6, a total of 23 parts. L's share = 9/23 × 3105 = 9 × 135 = Rs 1,215.

'due to you' = 'bd ba ca' and 'is due to' = 'ba xe ca' share due and to, and the codes ba and ca. So the remaining word, 'you', = bd.

(a − b)² = a² + b² − 2ab, so 25 = 97 − 2ab. Then 2ab = 72 and ab = 36.

Each word is the sum of its letters' alphabet positions: CAR = 3 + 1 + 18 = 22 and BUS = 2 + 21 + 19 = 42. TRAM = 20 + 18 + 1 + 13 = 52.

Profit is shared by capital × time: N = 20,000 × 12 = 2,40,000 and C = 10,000 × 6 = 60,000, a ratio of 4 : 1. N's share = 4/5 × 10,000 = Rs 8,000.

WORK and ROCK share O, R and K, and their codes share 3, 5 and 7, so W = 9 and C = 8. WART = 1945 contains W (9) and R; the only digit for R common to both is 5. That leaves A and T as 1 and 4 in some order, so T is either 1 or 4.

Yerwada Central Jail is in Pune, Maharashtra. Gandhi, Nehru and other freedom fighters were imprisoned there, and the Poona Pact of 1932 was signed there.

Bare–dressed, baffled–informed and degrade–exalt are opposites. Counterfeit and fake mean the same thing (synonyms), so that pair is different.

A vote on account (Article 116) lets the Lok Sabha grant money for part of a financial year, usually two months, so the government can meet its expenses until the full budget is passed.

Aizawl is the capital of Mizoram. Shillong is the capital of Meghalaya, Imphal of Manipur, and Kavaratti of Lakshadweep.

Statement 2 says the rich and well-connected get away with wrongdoing, so I follows. Statement 1 says we lack the will to punish anyone but the weak and poor; this implies that with the will, justice would be the same for all, so II follows too.

India shares land borders with seven countries: Pakistan, Afghanistan (through PoK), China, Nepal, Bhutan, Bangladesh and Myanmar.

12 = 2² × 3, 16 = 2⁴, 20 = 2² × 5 and 24 = 2³ × 3. LCM = 2⁴ × 3 × 5 = 240.

The Smart Cities Mission lists core elements such as adequate water and power supply, sanitation, affordable housing (especially for the poor), efficient transport, IT connectivity and a sustainable environment. Free health care and education are not among its stated features.

After a 20% discount the price paid is 80% of the marked price: MP of the box = 6400/0.8 = Rs 8,000. For 20 items, the MP of each = 8000/20 = Rs 400.

A blunder is a big, serious error, a stronger form of 'error'. In the same way, 'excellent' is a stronger form of 'splendid' — the pair moves from a word to a more intense version of it.

Vertebrae are the small bones that make up the vertebral column (backbone). They protect the spinal cord, which runs through the canal they form; the official key marks spinal cord.

The gap between the two letters grows by 1 each time: A→B (+1), C→E (+2), F→I (+3), so next comes +4, and O→T (+5). Each term also starts one letter after the previous term ends: B → C, E → F, I → J. So the missing term is J→N, i.e. JN.

Twin primes are pairs of prime numbers that differ by 2, such as (3, 5), (5, 7) and (11, 13). (2, 3) differ by 1, and 4, 6 and 9 are not prime.

X does 25% in 20 days, so X alone needs 80 days. X and Y finish the remaining 75% in 15 days, i.e. together they do 3/4 ÷ 15 = 1/20 per day. Y's rate = 1/20 − 1/80 = 3/80, so Y alone takes 80/3 = 26⅔ days.

(a − b)² = a² − 2ab + b². With a = 4x and b = 7: 16x² − 56x + 49.

Fire can cause a burn (destruction); in the same way, water can cause a flood. The pair links an element with the harm it can do.

Boyle's, Charles's and Avogadro's laws describe the behaviour of gases (volume, pressure, temperature and amount). Joule's law describes the heat produced by an electric current (H = I²Rt), not gases.

Amount = P × 1.2² = 1.44P = 14,400, so P = Rs 10,000.

In decimals: 5/8 = 0.625, 3/4 = 0.75, 13/16 = 0.8125 and 7/12 ≈ 0.583. The smallest is 7/12.

sin 60° = √3/2 and cot 30° = √3. Their product = (√3/2) × √3 = 3/2.

'Advances in Space Research' is the official journal of the Committee on Space Research (COSPAR) of the International Science Council, published by Elsevier.

The area of a square = (diagonal)²/2, so areas are in the ratio of the squares of the diagonals: 2² : 1² = 4 : 1.

Solar, wind and ocean-wave energy are renewable: they are naturally replenished. Coal is a fossil fuel formed over millions of years, and it cannot be replaced once used, so it is non-renewable.

A serial port sends and receives data one bit at a time in both directions, so information can travel both to and from the computer's storage through it.

The number divides 391 − 7 = 384 and 318 − 6 = 312 exactly. HCF(384, 312) = 24 (384 = 2⁷ × 3, 312 = 2³ × 3 × 13). So the greatest such number is 24.

Safe banking advice is: don't share your ATM card, PIN or login details, and do change your PIN regularly. 'Don't change your PIN at regular intervals' goes against safety advice, so it is the odd one out.

The passage says there can be no true progress in technology without such risks, i.e. real progress comes with some risk. It says the IT industry needs to be equipped for them, not that it is unequipped or that privacy doesn't matter.

An endoscope is a thin, flexible tube with a light and camera that doctors pass into the body to examine the digestive tract. An oscilloscope displays electrical signals, and a radiograph is an X-ray image.

The twinkling of stars, mirages and the bending of light as it passes between media are all due to refraction. Lateral inversion (left–right reversal in a mirror) is due to reflection, not refraction.

Males: the father X (1), the four married sons (4), and the grandsons: two sons have one son each (2) and the other two have two sons each (4), giving 11. The married daughter also lives in the joint family, so her husband adds 1 more, making 12 male members (the official answer).

10 kg cashews = 25 kg groundnuts, so 1 kg cashew = 2.5 kg groundnuts and 4 kg cashews = 10 kg groundnuts. Then 15 + 10 = 25 kg of groundnuts cost Rs 7,000, so groundnuts cost 7000/25 = Rs 280 per kg.

V ÷ U + W means V is the son of U, and U is the brother of W. So V is the son of W's brother, i.e. W's nephew.

Original total = 25 × 55 = 1,375. One bag was read as 65 instead of 56, adding 9 too many, so the correct total = 1,366. Correct mean = 1366/25 = 54.64.

w/0.80 = 9/6, so w = 0.80 × 9/6 = 1.2.

Bhikaji (Madam) Cama unfurled one of the first versions of the Indian national flag at the International Socialist Congress in Stuttgart, Germany, on 22 August 1907.

The Jan Aushadhi campaign aims to provide quality generic medicines at affordable prices, reduce treatment costs and involve the private sector too. Its model is meant to be replicable, including in other countries, so 'replicated only in India' is not an objective.

Mithali Raj captained India at the ICC Women's World Twenty20 in March 2016, held in India.

Those speaking both Bengali and Hindi = 60 − (10 + 5 + 10 + 12 + 13 + 5) = 5. Hindi speakers = 10 (with Odia) + 12 (with Marathi) + 5 (with Assamese) + 5 (with Bengali) = 32.

People speaking more than one language = 10 (Hindi, Odia) + 12 (Marathi, Hindi) + 13 (English, Tamil, Marathi) + 5 (Assamese, Hindi) + 5 (Bengali, Hindi) = 45. Only the 15 who speak only Bengali or only Assamese speak one language.

Bengali speakers = 10 (only) + 5 (with Hindi) = 15. Marathi speakers = 12 (with Hindi) + 13 (with English and Tamil) = 25. Ratio = 15/25 = 3/5.

With g goats and (60 − g) peacocks, feet = 4g + 2(60 − g) = 170. So 2g + 120 = 170 and g = 25.

Time = 40/80 + 30/60 = 0.5 + 0.5 = 1 hour for 70 km. Average speed = 70/1 = 70 km/h.

By Archimedes' principle, a body in a fluid feels an upward buoyant force equal to the weight of fluid it displaces. An object floats when that force can balance its weight.

H comes on Tuesday and K, the surgeon, on Wednesday. E, the cardiologist, avoids Tuesday and Thursday, and Monday is the physician's day, so E comes on Friday. G is not the physician, so F is the physician (Monday) and G comes on Thursday. The Thursday visitor isn't the nephrologist, so G is the dentist and H is the nephrologist.

From the schedule (Mon F, Tue H, Wed K, Thu G, Fri E), the physician, who comes on Monday, is F.

E is the cardiologist. Monday is the physician's, Tuesday H's and Wednesday K's, and E cannot come on Thursday, so E comes on Friday.

The tap fills 1/50 of the tank per minute and the leak (2½ h = 150 min) empties 1/150. Net = 1/50 − 1/150 = 2/150 = 1/75 per minute, so the tank fills in 75 minutes = 1 hour 15 minutes.

The 2016 ICC World Twenty20 (hosted by India) included all 10 ICC full members. Other than the host India, that is nine full-member teams.

BROWN → BNORW arranges the letters in alphabetical order. SOUND in alphabetical order is D N O S U = DNOSU.

Silicosis is an occupational lung disease caused by breathing silica dust over long periods, common among miners, stone-cutters, glass and construction workers.

The speed of light in vacuum is about 3.00 × 10⁸ m/s (exactly 299,792,458 m/s).

Each term is a power of 2 plus 1: 2 + 1 = 3, 4 + 1 = 5, 8 + 1 = 9, 16 + 1 = 17, 32 + 1 = 33, 64 + 1 = 65 (equivalently, each term is twice the previous minus 1). The missing term is 17.

Rewrite as 0.2³ × (0.06/0.12)³ = 0.2³ × 0.5³ = (0.2 × 0.5)³ = 0.1³ = 0.001.

The Salar Jung Museum, one of India's national museums with a large collection of art and antiques, is in Hyderabad, on the banks of the Musi river.

Priyanka Chopra won the People's Choice Award 2016 for Favourite Actress in a New TV Series for playing FBI recruit Alex Parrish in the American thriller 'Quantico', the first South Asian to win a People's Choice award.

Range = largest − smallest = 9 − 3 = 6.

Htin Kyaw, sworn in on 30 March 2016, was Myanmar's first civilian president since the 1962 military coup. He was a close aide of Aung San Suu Kyi.

The yellow street lamps are sodium-vapour lamps, which glow with sodium's characteristic yellow light (589 nm). They are efficient and penetrate fog well.

Curd contains mainly lactic acid, produced when Lactobacillus bacteria ferment the lactose in milk. The acid makes curd sour and thickens it.

Wheat cost 5 × 70 = Rs 350, sold at 10% gain for Rs 385. Sugar cost 10 × 80 = Rs 800, sold at 20% gain for Rs 960. Total sale price = 385 + 960 = Rs 1,345.

Konkani is the official language of Goa (under the Goa Official Language Act 1987); Marathi is also allowed for official purposes. Konkani is in the Eighth Schedule of the Constitution.

A 2% increase in the rate for 1 year adds Rs 120 of interest, so 2% of the principal = 120. Principal = 120 × 100/2 = Rs 6,000.

Circumference = 2πr. With radius r + x, it becomes 2π(r + x) = 2πr + 2πx, so the increase is 2πx units.

ISS stands for International Space Station, a joint project of the USA, Russia, Europe, Japan and Canada orbiting about 400 km above the Earth since 1998.

A simple periscope uses two plane mirrors, set parallel at 45°, to reflect light round obstacles so you can see over or around them. (Some periscopes use prisms instead.)

The search team thinks the debris is 'highly likely' from MH370, which is not certainty, so I does not follow. Nothing suggests the team is mistaken either, so II does not follow. Neither follows.

Alluvial soils are formed by sand, silt and clay deposited by rivers (and in coastal areas by sea waves). They cover the Indo-Gangetic plains and the deltas and are very fertile.

X and Y are brothers and F is X's father, so F is also Y's father. Z is Y's wife and E is Z's son, so E is Y's son and therefore F's grandson.

LIGER → GIRLE takes the letters in the order 3rd, 2nd, 5th, 1st, 4th (G I R L E). Applying the same order to TEPAL (T E P A L) gives P E L T A = PELTA.

sin θ = 15/17, so cos θ = √(1 − 225/289) = 8/17. Then cot θ = cos θ / sin θ = 8/15.

Let the first number be x; then the others are 3x and 6x. Their sum 10x = 3 × 70 = 210, so x = 21, the smallest.

Under Article 174, six months must not pass between the last sitting of one session of a State Legislature and the first sitting of the next, so the maximum gap is 6 months.

Replacing the letters, 6 C 78 B 3 A 4 E 6 becomes 6 + 78 ÷ 3 − 4 × 6. Division and multiplication first: 26 and 24. Then 6 + 26 − 24 = 8.

The average distance between the Sun and the Earth is about 149.6 million km = 14.96 × 10⁷ km, which defines one astronomical unit (AU).

Since 1993 India has had a market-determined exchange rate: the rupee's value (mainly against the US dollar) is set by demand and supply in the forex market. The RBI publishes a daily reference rate and can intervene, but it does not decide the rate, so statement B is not true.

M is younger than R and older than P, and the age gaps are equal, so R − M = M − P. That gives 2M = R + P = 66, so M is 33.

OLEMN = LEMON, PEALP = APPLE and OGREAN = ORANGE are fruits. OTTOPA = POTATO is a vegetable, so it is different.

S. S. P. Chawrasia is an Indian professional golfer who has won several Asian Tour titles, including the Indian Open in 2016 and 2017. H. S. Prannoy and Chetan Anand are badminton players.

Three-fifths of 30 km is 18 km, covered at 6 km/h in 3 hours. The remaining 12 km at 4 km/h takes another 3 hours. Starting at 6:30 am, 6 hours later he finishes at 12:30 pm.

Rajaji National Park, named after C. Rajagopalachari, is in Uttarakhand, in the Shivalik hills near Haridwar and Rishikesh. It is known for its elephants and tigers.