RRB NTPC CBT-I Official Paper (Held On: 30 Dec 2020 Shift 1) · 100 வினாக்கள். ஒவ்வொரு வினாவையும் முயன்று, பிறகு அதன் விடையைத் திறவுங்கள்.
விடை: (C) 35 மீ
The longest pole is the room's diagonal: √(30² + 15² + 10²) = √(900 + 225 + 100) = √1225 = 35 m.
விடை: (C) \((abc)^\frac{1}{3}\)
With edges l, b, h: a = lb, b = bh, c = hl, so abc = (lbh)². Volume = lbh = (abc)^½.
விடை: (C) கர்நாடகா
Karnataka is India's largest gold producer, mainly from the Hutti and Kolar regions.
விடை: (B) 6.25%
One year's growth from Rs 1600 to Rs 1700 is Rs 100, i.e. 100/1600 = 6.25% per annum.
விடை: (D) ஜம்மு & காஷ்மீர்
The Zojila Tunnel, giving all-weather road access between Srinagar and Leh under the Zoji La pass, is in Jammu & Kashmir/Ladakh.
விடை: (B) உள்ளீடு
A trackball – a ball rolled to move the pointer – is an input device.
விடை: (D) 6891.59775
6202.5 + 620.25 + 62.025 + 6.2025 + 0.62025 = 6891.59775.
விடை: (D) UVTCVGIA
Each letter of VIARAIL moves 2 places forward to give XKCTCKN. Applying +2 to STRATEGY gives UVTCVGIA.
விடை: (A) 5
The sum of the first n odd numbers is n². 1 + 3 + 7 + 9 + 11 + 13 is missing 5; adding it gives 49 = 7².
விடை: (A) டைனமிக் ஹோஸ்ட் உள்ளமைவு நெறிமுறை
DHCP is the Dynamic Host Configuration Protocol, which automatically assigns IP addresses to devices on a network.
விடை: (B) கோத்தாரி கமிஷன்
The Sarkaria, Punchhi and Rajamannar Commissions examined Centre–State relations. The Kothari Commission (1964–66) was on education.
விடை: (D) 16
Primes below 55: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53 – that is 16.
விடை: (A) குழிமடிவுப்பாறை
When rock layers fold, the downward (trough) folds are synclines and the upward (arch) folds are anticlines.
விடை: (C) கண்காணிப்பாளர்
A gardener looks after a garden; a curator looks after a museum.
விடை: (D) 20
In the first triangle the centre number is (top + bottom-left) ÷ 5 = (37 + 43) ÷ 5 = 16. Applying the same to the second: (47 + 53) ÷ 5 = 20. (The third triangle does not follow this neatly; the official RRB answer is 20.)
விடை: (B) 36
The figure is a 3 × 3 grid with 4 horizontal and 4 vertical lines. A rectangle needs 2 of each: C(4, 2) × C(4, 2) = 6 × 6 = 36.
விடை: (B) 1024
1 kilobyte = 2¹⁰ = 1024 bytes.
விடை: (D) ஆதித்யா-L1
Aditya-L1 is ISRO's mission to study the Sun's corona and solar wind from the L1 Lagrange point; it was launched in September 2023.
விடை: (D) பர்மிங்காம்
The 2022 Commonwealth Games were held in Birmingham, England.
விடை: (A) 32
x − 0.25x = 0.75x = 24, so x = 32.
விடை: (B) சர்தார் வல்லபாய் படேல்
Sardar Vallabhbhai Patel led the Bardoli Satyagraha of 1928, after which the women of Bardoli gave him the title 'Sardar'.
விடை: (B) 12.5%
Coefficient of variation = SD/mean × 100 = 5/40 × 100 = 12.5%.
விடை: (A) சிலிக்கான்
Silicon is a metalloid, with properties between metals and non-metals. Bromine is a non-metal; lead and gold are metals.
விடை: (D) ஹார்டிங் பிரபு
The Royal Commission on the Public Services in India (Islington Commission) was set up in 1912, during Lord Hardinge II's viceroyalty (1910–1916).
விடை: (D) 300 கிலோ
Zinc is 6 of 20 parts. 6 parts = 90 kg, so 1 part = 15 kg and the whole = 20 × 15 = 300 kg.
விடை: (D) எத்திலீன்
Ethylene (ethene) is polymerised to make polyethylene (polythene), the most common plastic.
விடை: (B) சூத்ரகர்
Mricchakatika ('The Little Clay Cart'), a Sanskrit drama, was written by Shudraka.
விடை: (B) TSRQ
Each letter is replaced by its opposite letter in the alphabet (A↔Z, B↔Y, …): ABCD → ZYXW. So GHIJ → TSRQ.
விடை: (B) 105°
In triangle ABC, ∠ACB = 180° − 30° − 50° = 100°, so ∠ECD = 80°. In triangle ECD, ∠CED = 180° − 80° − 25° = 75°. So ∠AED = 180° − 75° = 105°.
விடை: (A) தண்டுவடம்
The spinal cord carries impulses between the brain and the body and is the centre of reflex actions.
விடை: (A) 15
Avinash does 1/20 a day; Bhuvnesh and Chaman together do 1/30 + 1/60 = 1/20. In every 3 days: 3/20 + 1/20 = 1/5 of the work. The whole takes 5 × 3 = 15 days.
விடை: (A) -40
(4 + 2 − 4 + 3) = 5; (1 + 56) ÷ 19 = 3; [(3 + 5 − 4) + (17 − 36)] = 4 − 19 = −15. So 5 + 3 × (−15) = −40.
விடை: (A) தெலுங்கானா
Telangana, carved out of Andhra Pradesh on 2 June 2014, became India's 29th state.
விடை: (A) என்.கே. சிங்
N. K. Singh, a former IAS officer and Rajya Sabha MP, chaired the Fifteenth Finance Commission (2017).
விடை: (C) \(\frac{4}{35}\)
After round 1: 2/3 left. After round 2: 2/3 × 2/5 = 4/15. After round 3: 4/15 × 3/7 = 4/35 of the original.
விடை: (B) 3(x - y)(y - z)(z - x)
If a + b + c = 0 then a³ + b³ + c³ = 3abc. Here (x − y) + (y − z) + (z − x) = 0, so the sum = 3(x − y)(y − z)(z − x).
விடை: (B) தச்சிகம் தேசிய பூங்கா
Dachigam National Park near Srinagar, home of the Hangul (Kashmir stag), is in Jammu & Kashmir.
விடை: (D) ஜார்ஜ் லாமைட்ரே
Belgian physicist-priest Georges Lemaître proposed the 'primeval atom' theory in 1927–31, later called the Big Bang theory.
விடை: (D) 1991
Disinvestment of public sector enterprises began in 1991–92 as part of the economic reforms.
விடை: (D) 6
3 men = 6 boys, so 1 man = 2 boys. The work = 3 × 20 = 60 man-days. 6 men + 8 boys = 10 men, so 60/10 = 6 days.
விடை: (B) \(\frac{23}{99}\)
0.2323… (23 repeating) = 23/99.
| முறையான கற்றவர்கள் | சிறுவர்கள் | 39 மௌனமாதம் |
|---|---|---|
| பெண்கள் | 52 | |
| முறைசாரா கற்றவர்கள் | சிறுவர்கள் | 65 |
| பெண்கள் | 78 | |
| படிப்பறிவில்லாதவர்கள் | சிறுவர்கள் | 143 |
| பெண்கள் | 169 |
விடை: (A) 7 : 11 : 24
Formal = 39 + 52 = 91, informal = 65 + 78 = 143, illiterates = 143 + 169 = 312. Dividing by 13: 7 : 11 : 24.
விடை: (B) போகிபீல் பாலம்
The 4.94 km Bogibeel bridge over the Brahmaputra near Dibrugarh, opened in December 2018, is India's longest rail-cum-road bridge.
விடை: (A) கல்வி
SATH-E (Sustainable Action for Transforming Human capital – Education) is NITI Aayog's project to transform school education in partner states.
விடை: (D) 56
The terms are n(n + 1): 1×2, 2×3, …, 6×7 = 42. Next: 7 × 8 = 56.
விடை: (B) பிரதான் மந்திரி ஜன் தன் யோஜனா
Pradhan Mantri Jan Dhan Yojana entered the Guinness World Records for opening 1.8 crore bank accounts in a single week in August 2014.
விடை: (C) குத்புத்தீன் ஐபக்
Qutb-ud-din Aibak founded the Slave (Mamluk) dynasty of the Delhi Sultanate in 1206.
விடை: (C) கேரளா
Kerala has a unicameral legislature. Karnataka, Maharashtra and Telangana have Legislative Councils.
விடை: (C) ககன்
GAGAN (GPS Aided GEO Augmented Navigation), by ISRO and the Airports Authority of India, is India's satellite-based augmentation system.
விடை: (D) பணிநீக்கம்
Disobey is the opposite of obey; dismiss is the opposite of appoint.
விடை: (A) 0
The product includes cos 90° = 0, so the whole product is 0.
விடை: (A) ரூ. 34,500
In year 3, bank A pays 8.5% and bank B 10%. The difference of 1.5% on Rs 23,00,000 = Rs 34,500.
விடை: (D) ஆர்க்டிக் பெருங்கடல் மற்றும் பசிபிக் பெருங்கடல்
The Bering Strait, between Russia and Alaska, connects the Arctic Ocean with the Pacific Ocean.
விடை: (C) 200
First three years: 150 + 100 + 250 = 500. Last three: 100 + 300 + 300 = 700. Difference = 200.
விடை: (C) 80%
Fall = 84500 − 16900 = 67600, and 67600/84500 × 100 = 80%.
விடை: (D) P
Boys facing north, west to east: A, E, C, D, B – C in the centre, D between C and B, and B three seats from E. Girls opposite: T opposite B with S to T's right, so S and T face D and B; P sits between Q and R, opposite E. So P is opposite E.
விடை: (D) வர்த்தமானர்
Mahavira, the 24th Jain Tirthankara, was born Vardhamana.
விடை: (C) 0
cos 168° = −cos 12° and cos 96° = −cos 84°, so the four terms cancel in pairs: the sum is 0.
விடை: (C) \(\frac{19}{32}\)
36.1/102.4 = 361/1024, so the square root is 19/32.
விடை: (B) ஊர்வன
Reptiles have a backbone and are vertebrates. Molluscs, arachnids and insects are invertebrates.
விடை: (A) கேரளா
The 2018 Nipah virus outbreak occurred in Kozhikode and Malappuram districts of Kerala.
விடை: (C) 1% நட்டம்
When two articles are sold at the same price, one at x% gain and the other at x% loss, the net result is a loss of x²/100 % = 100/100 = 1%.
விடை: (A) 3 செ.மீ
The height from the apex bisects the base: half-base = 4 cm, so height = √(5² − 4²) = 3 cm.
விடை: (D) 8
9.25 ÷ 1.125 ≈ 8.2, so about 8 loaves.
விடை: (C) பிளாட்டோ
'The Republic', a dialogue on justice and the ideal state, was written by the Greek philosopher Plato.
விடை: (D) அபிதர்ம கோஷா
The Abhidharmakosha by Vasubandhu is an ancient Buddhist philosophical text. Vishnu Purana is Hindu, and Raghuvamsham and Ritusamhara are Kalidasa's poems.
விடை: (B) 10
After the changes: 28 − (5 + 7) × 9/6 = 28 − 12 × 1.5 = 28 − 18 = 10.
விடை: (A) 4722
LCM(27, 35, 25, 21) = 3³ × 5² × 7 = 4725. The number is 3 less: 4722.
விடை: (B) 9 : 7
The numbers are (20 + 2.5)/2 = 11.25 and (20 − 2.5)/2 = 8.75. Ratio 11.25 : 8.75 = 9 : 7.
கொடுக்கப்பட்டுள்ள படத்தில், xஇன் மதிப்பு என்ன?
விடை: (B) 60°
ABCDE is a pentagon with interior angles adding to 540°. ∠A = 90°, ∠B = 180° − 65° = 115°, ∠C = 180° − 80° = 100° and ∠D = 115°, so ∠E = 540° − 420° = 120°. x is supplementary to it: x = 60°.
விடை: (B) அத்தை
A is C's uncle (brother of C's father B), and D is A's wife, so D is C's aunt.
விடை: (B) நிலக்கரி
Water, solar and wind energy are renewable; coal is a non-renewable fossil fuel.
விடை: (B) பச்சை செடி
Water, sunlight and soil are abiotic (non-living). A green plant is a living, biotic component.
விடை: (C) 83.75 கி.மீ
Moving in opposite directions, their separation grows at 30 + 3.5 = 33.5 km/h. In 2.5 h: 83.75 km.
விடை: (C) 52/123
1 + 4 − 3 + 65 = 67. (2 + 63)/13 = 5 and 65 + 7 − 19 = 53, giving 265. 19 − 195 = −176. Numerator = 67 + 265 − 176 = 156, and 156/369 = 52/123.
விடை: (A) ஹைசிஸ்
HysIS (Hyperspectral Imaging Satellite), launched by PSLV-C43 in November 2018, is India's first advanced hyperspectral Earth-observation satellite.
விடை: (A) \(\frac{1}{36}\)
There are 36 equally likely outcomes and only (6, 6) gives a sum of 12. Probability = 1/36.
விடை: (C) ராமானுஜாச்சாரியார்
Ramanujacharya (11th–12th century) founded Vishishtadvaita (qualified non-dualism).
விடை: (B) முதன்மை பயிர்களின் விநியோக நிலைப்படுத்தல் (தக்காளி வெங்காய உருளைக்கிழங்கு)
Operation Greens (2018) aims to stabilise the supply and prices of tomato, onion and potato (TOP crops).
விடை: (A) எல்லோரும் இன்பத்தை விரும்புகிறார்கள்.
Calling pleasure 'desirable' assumes that it is something everyone desires.
விடை: (C) அப்சரா
Apsara, which went critical at Trombay on 4 August 1956, was India's (and Asia's) first nuclear research reactor.
விடை: (C) பிரிட்டோரியா
South Africa has three capitals: Pretoria (administrative), Cape Town (legislative) and Bloemfontein (judicial).
விடை: (B) பாரிஸ்
The OECD (Organisation for Economic Co-operation and Development) is headquartered in Paris.
விடை: (A) பலசெல் உயிரினம்
Metazoa – multicellular animals – make up Kingdom Animalia. Protozoa are single-celled organisms placed in Kingdom Protista, and Choanozoa are their single-celled relatives.
விடை: (D) ரூ.156
At an 8% loss, CP = 138/0.92 = Rs 150. For a 4% gain, SP = 150 × 1.04 = Rs 156.
விடை: (A) அனைத்து வாக்காளர்களும் விசுவாசிகள்.
All voters are citizens and all citizens are loyalists, so all voters are loyalists.
விடை: (D) முழுமையற்ற தகவல் தீங்கு விளைவிக்கும்.
The proverb warns that partial knowledge can mislead; it rests on the idea that incomplete information may cause harm.
விடை: (C) அனைத்து கலைஞர்களும் கார்ட்டூனிஸ்ட்கள்.
With the shaded regions removed, the only artists left are in the region common to all three circles, so all artists are cartoonists. Some cartoonists remain outside the artists circle, and the remaining artists are also billionaires, so the other options are false.
B.
C.
D.
விடை: (A) A
A mirror image reverses the order of letters and flips each letter: ENCOURAGEMENT becomes TNEMEGARUOCNE with every letter mirrored – option 1.
விடை: (C) 112
The code is the sum of letter positions: PENINSULA = 16 + 5 + 14 + 9 + 14 + 19 + 21 + 12 + 1 = 111. DICHOTOMY = 4 + 9 + 3 + 8 + 15 + 20 + 15 + 13 + 25 = 112.
விடை: (C) 121
These are squares of odd numbers: 1², 3², 5², 7², 9², so the next is 11² = 121.
B.
C.
D.
விடை: (C) C
Plates and bowls are both crockery but different from each other: two separate circles inside one big circle – option 3.
விடை: (A) YUP
Each letter is replaced by its opposite (A↔Z, E↔V, J↔Q). So BFK → YUP.
விடை: (D) 5
Doctors who are surgeons but not general practitioners lie in the overlap of the Surgeons and Doctors circles outside the GP circle – 5.
விடை: (B) 163
The terms increase alternately by 10 and 20: 13, 23, 43, 53, 73, 83, 103, 113, 133, 143, so the next is 143 + 20 = 163.
விடை: (A) 12 : 11
Highest (Kolkata) = 1,20,000 and lowest (Mumbai) = 1,10,000. Ratio = 12 : 11.
விடை: (D) எந்த நீர்வீழ்ச்சிகளும் குதிரைகள் அல்ல.
All horses are mammals and no mammal is an amphibian, so no horse is an amphibian – equivalently, no amphibians are horses.
விடை: (A) திசையறி கருவி
Beaker, test tube and dropper are laboratory glassware for liquids. A compass is a drawing or direction instrument.
A.
B.
C.
D.
விடை: (A) A
As per the official RRB key, option 1 completes the pattern. (The dot counts 3, 6, 9 would suggest 12 next, which no option has, so the official answer is taken here.)
| 14 | 12 | 10 | 8 |
|---|---|---|---|
| 10 | 8 | 2 | 4 |
| 8 | 14 | 6 | 16 |
| 12 | 18 | 14 | ? |
விடை: (D) 20
As per the official RRB key, the missing number is 20. (No single simple row or column rule fits every cell of the printed matrix, so the official answer is taken here.)
