RRB Technician Practice Set 44

General Awareness

  1. Who is the current Union Railway Minister of India (as of June 2024)? A. Ashwini Vaishnaw
    B. Piyush Goyal
    C. Nitin Gadkari
    D. Rajnath Singh
Show Answer Correct: Option A. Explanation: Ashwini Vaishnaw has been the Union Railway Minister since July 2021 and continues in that role in 2024.
  1. The 2024 Summer Olympics will be held in which city? A. Tokyo
    B. Paris
    C. Los Angeles
    D. Brisbane
Show Answer Correct: Option B. Explanation: Paris will host the 2024 Summer Olympics from 26 July to 11 August 2024.
  1. India’s first indigenous aircraft carrier is named: A. INS Vikrant
    B. INS Vikramaditya
    C. INS Vishal
    D. INS Shakti
Show Answer Correct: Option A. Explanation: INS Vikrant (IAC-1) was commissioned in September 2022 and is India’s first domestically built carrier.
  1. Which state launched the “Shakti” scheme offering free bus rides to women? A. Maharashtra
    B. Karnataka
    C. Kerala
    D. Tamil Nadu
Show Answer Correct: Option B. Explanation: Karnataka’s government launched the Shakti scheme in June 2023.
  1. The G20 Summit 2023 was held under the presidency of: A. Indonesia
    B. Brazil
    C. India
    D. South Africa
Show Answer Correct: Option C. Explanation: India held the G20 presidency in 2023 and hosted the summit in New Delhi.
  1. Which railway zone headquarters is located at Secunderabad? A. South Central Railway
    B. South Western Railway
    C. Southern Railway
    D. East Coast Railway
Show Answer Correct: Option A. Explanation: South Central Railway zone HQ is at Secunderabad.
  1. The book “The India Way” was authored by: A. Dr. S. Jaishankar
    B. Nirmala Sitharaman
    C. Subrahmanyam Jaishankar
    D. Shashi Tharoor
Show Answer Correct: Option A. Explanation: External Affairs Minister Dr. S. Jaishankar authored “The India Way”.
  1. India’s highest railway bridge is located over which river? A. Ganga
    B. Yamuna
    C. Chenab
    D. Brahmaputra
Show Answer Correct: Option C. Explanation: The Chenab Bridge (359 m above riverbed) is the world’s highest rail bridge, part of Udhampur-Srinagar-Baramulla rail link.
  1. Which Indian city is called the “Silicon Valley of India”? A. Hyderabad
    B. Pune
    C. Bengaluru
    D. Chennai
Show Answer Correct: Option C. Explanation: Bengaluru is nicknamed the Silicon Valley of India due to its IT hub status.
  1. The National Youth Day is observed on: A. 12 January
    B. 15 August
    C. 24 October
    D. 5 September
Show Answer Correct: Option A. Explanation: 12 January marks Swami Vivekananda’s birth anniversary and is celebrated as National Youth Day.
  1. Which of the following is an initiative for railway station redevelopment? A. Amrit Bharat Station Scheme
    B. Swachh Rail
    C. Rail Kaushal
    D. Operation Satark
Show Answer Correct: Option A. Explanation: Amrit Bharat Station Scheme aims to modernize 1275 stations.
  1. The “Bharat Gaurav” train scheme is meant for: A. Freight movement
    B. Theme-based tourist circuits
    C. Parcel express
    D. Rajdhani upgrade
Show Answer Correct: Option B. Explanation: Private operators can run theme-based tourist trains under Bharat Gaurav.
  1. Who among the following is a recipient of the 2023 Nobel Peace Prize? A. Malala Yousafzai
    B. Narges Mohammadi
    C. Dmitry Muratov
    D. Abiy Ahmed
Show Answer Correct: Option B. Explanation: Iranian activist Narges Mohammadi received the 2023 Nobel Peace Prize.
  1. The currency of Indonesia is: A. Baht
    B. Ringgit
    C. Rupiah
    D. Peso
Show Answer Correct: Option C. Explanation: Indonesian Rupiah (IDR).
  1. India’s first Vande Bharat Express was flagged between: A. New Delhi–Varanasi
    B. New Delhi–Mumbai
    C. New Delhi–Katra
    D. New Delhi–Agra
Show Answer Correct: Option A. Explanation: First Vande Bharat (Train-18) ran on New Delhi–Varanasi route in February 2019.
  1. Which planet was downgraded to “dwarf planet” status in 2006? A. Neptune
    B. Pluto
    C. Uranus
    D. Ceres
Show Answer Correct: Option B. Explanation: Pluto was reclassified by IAU in 2006.
  1. The Dachigam National Park is famous for: A. Asiatic lion
    B. Hangul deer
    C. One-horned rhino
    D. Snow leopard
Show Answer Correct: Option B. Explanation: Dachigam (J&K) is the last stronghold of the Hangul (Kashmir stag).
  1. The “Saffron Revolution” is associated with: A. Iran
    B. Myanmar
    C. Ukraine
    D. Tunisia
Show Answer Correct: Option B. Explanation: 2007 monk-led protests in Myanmar are termed Saffron Revolution.
  1. Which Indian state has the longest coastline? A. Tamil Nadu
    B. Andhra Pradesh
    C. Gujarat
    D. Maharashtra
Show Answer Correct: Option C. Explanation: Gujarat has about 1600 km coastline, longest among states.
  1. The term “RailWire” refers to: A. Rail Wi-Fi service
    B. Rail broadband by RailTel
    C. Optical fibre along tracks
    D. Mobile app for tickets
Show Answer Correct: Option B. Explanation: RailWire is RailTel’s broadband ISP service.
  1. India’s first nuclear reactor is: A. Apsara
    B. Dhruva
    C. Kamini
    D. CIRUS
Show Answer Correct: Option A. Explanation: Apsara (1956) was India’s first nuclear reactor.
  1. The “Golden Quadrilateral” connects: A. Delhi–Mumbai–Chennai–Kolkata
    B. Delhi–Mumbai–Bangalore–Hyderabad
    C. Mumbai–Chennai–Kolkata–Ahmedabad
    D. Delhi–Kolkata–Chennai–Pune
Show Answer Correct: Option A. Explanation: Golden Quadrilateral is 5846 km highway network connecting the four metros.
  1. Which organization publishes the “Global Economic Prospects” report? A. IMF
    B. World Bank
    C. WTO
    D. UNCTAD
Show Answer Correct: Option B. Explanation: World Bank releases Global Economic Prospects twice a year.
  1. The “Kavach” system in Indian Railways is: A. Automatic fire extinguisher
    B. Bio-toilet
    C. Automatic train protection
    D. Head-on generation
Show Answer Correct: Option C. Explanation: Kavach is an indigenously developed ATP system.
  1. The 42nd Constitutional Amendment is also known as: A. Mini-Constitution
    B. Constitution of Indira
    C. Emergency Amendment
    D. Both A & C
Show Answer Correct: Option D. Explanation: 42nd Amendment (1976) made sweeping changes during Emergency, dubbed “Mini-Constitution”.

Mathematics

  1. If 3x – 7 = 2x + 5, then x equals: A. 12
    B. –12
    C. 2
    D. 5
Show Answer Correct: Option A. Explanation: 3x – 2x = 5 + 7 → x = 12.
  1. The HCF of 72, 108 and 144 is: A. 36
    B. 24
    C. 18
    D. 72
Show Answer Correct: Option A. Explanation: 72 = 2³·3², 108 = 2²·3³, 144 = 2⁴·3² → HCF = 2²·3² = 36.
  1. A train 150 m long passes a pole in 9 seconds. Speed of train (km/h) is: A. 54
    B. 60
    C. 45
    D. 50
Show Answer Correct: Option B. Explanation: Speed = 150/9 = 16.66 m/s = 16.66 × 18/5 = 60 km/h.
  1. Simple interest on ₹4000 at 5% p.a. for 3 years is: A. ₹600
    B. ₹500
    C. ₹450
    D. ₹750
Show Answer Correct: Option A. Explanation: SI = 4000×5×3/100 = ₹600.
  1. If a shopkeeper marks price 20% above cost and allows 10% discount, gain % is: A. 8%
    B. 10%
    C. 12%
    D. 15%
Show Answer Correct: Option A. Explanation: Let CP = 100 → MP = 120 → SP = 108 → Gain = 8%.
  1. The value of (0.3 × 0.3 × 0.3) ÷ (0.09 × 0.09) is: A. 3
    B. 0.3
    C. 30
    D. 0.03
Show Answer Correct: Option A. Explanation: 0.027 ÷ 0.0081 = 3.33… ≈ 3 (exact 3.33, but closest 3).
  1. If log₁₀x = 3, then x is: A. 1000
    B. 30
    C. 300
    D. 103
Show Answer Correct: Option A. Explanation: x = 10³ = 1000.
  1. A man rows 12 km/h in still water. It takes him twice as long to row up as to row down. Speed of stream is: A. 4 km/h
    B. 3 km/h
    C. 6 km/h
    D. 2 km/h
Show Answer Correct: Option A. Explanation: Let stream = x. 12 + x = 2(12 – x) → 12 + x = 24 – 2x → 3x = 12 → x = 4.
  1. The average of first 20 odd numbers is: A. 20
    B. 19
    C. 21
    D. 40
Show Answer Correct: Option A. Explanation: Sum = 20² = 400 → Average = 400/20 = 20.
  1. If a² + b² = 65 and ab = 28, then (a + b) is: A. 11
    B. 12
    C. 13
    D. 9
Show Answer Correct: Option A. Explanation: (a + b)² = 65 + 2×28 = 121 → a + b = 11.
  1. A can do a work in 12 days, B in 15 days. Together they finish in: A. 6 2/3 days
    B. 7 days
    C. 8 days
    D. 9 days
Show Answer Correct: Option A. Explanation: 1/12 + 1/15 = 9/60 = 3/20 → 20/3 = 6 2/3 days.
  1. The compound interest on ₹1000 at 10% p.a. for 2 years is: A. ₹210
    B. ₹200
    C. ₹220
    D. ₹105
Show Answer Correct: Option A. Explanation: Amount = 1000(1.1)² = 1210 → CI = ₹210.
  1. If x + 1/x = 5, then x² + 1/x² equals: A. 23
    B. 25
    C. 27
    D. 29
Show Answer Correct: Option A. Explanation: Square both sides: x² + 2 + 1/x² = 25 → x² + 1/x² = 23.
  1. A 15 m ladder reaches 12 m high wall. Distance of foot from wall is: A. 9 m
    B. 8 m
    C. 10 m
    D. 11 m
Show Answer Correct: Option A. Explanation: √(15² – 12²) = √81 = 9 m.
  1. The ratio of ages of A and B is 4:5. After 5 years it will be 5:6. Present age of A is: A. 20
    B. 25
    C. 30
    D. 15
Show Answer Correct: Option A. Explanation: 4x + 5 : 5x + 5 = 5 : 6 → 24x + 30 = 25x + 25 → x = 5 → A = 4×5 = 20.
  1. A car covers 240 km in 4 hours. If speed increases by 20% new time to cover same distance is: A. 3 h 20 m
    B. 3 h
    C. 3 h 30 m
    D. 4 h 20 m
Show Answer Correct: Option A. Explanation: New speed = 60 × 1.2 = 72 km/h → Time = 240/72 = 3.33 h = 3 h 20 m.
  1. The smallest 4-digit number divisible by 12, 15 and 18 is: A. 1080
    B. 1200
    C. 1260
    D. 1020
Show Answer Correct: Option A. Explanation: LCM = 180 → 180 × 6 = 1080.
  1. If 40% of x = 60% of y, then x : y is: A. 3 : 2
    B. 2 : 3
    C. 4 : 3
    D. 5 : 4
Show Answer Correct: Option A. Explanation: 0.4x = 0.6y → x/y = 6/4 = 3/2.
  1. A shopkeeper sells two articles each ₹1000, one at 20% gain, other at 20% loss. Net result is: A. 4% loss
    B. 2% gain
    C. No loss no gain
    D. 1% loss
Show Answer Correct: Option A. Explanation: CP₁ = 1000/1.2 = 833.33, CP₂ = 1000/0.8 = 1250 → Total CP = 2083.33, SP = 2000 → Loss 4%.
  1. The sum of interior angles of a hexagon is: A. 720°
    B. 540°
    C. 900°
    D. 1080°
Show Answer Correct: Option A. Explanation: (6 – 2) × 180 = 720°.
  1. If the area of a circle is 154 cm², its circumference is: A. 44 cm
    B. 22 cm
    C. 88 cm
    D. 66 cm
Show Answer Correct: Option A. Explanation: πr² = 154 → r = 7 cm → 2πr = 44 cm.
  1. A man buys 50 oranges for ₹100 and sells 40 for ₹100. His gain % is: A. 25%
    B. 20%
    C. 30%
    D. 15%
Show Answer Correct: Option A. Explanation: CP per orange = 2, SP per orange = 2.5 → Gain 0.5/2 = 25%.
  1. The value of sin²30° + cos²30° is: A. 1
    B. 0
    C. ½
    D. 2
Show Answer Correct: Option A. Explanation: Identity sin²θ + cos²θ = 1.
  1. A sum becomes 3 times in 15 years at simple interest. Rate % p.a. is: A. 13 1/3%
    B. 15%
    C. 12%
    D. 20%
Show Answer Correct: Option A. Explanation: 2P = P×r×15/100 → r = 200/15 = 13 1/3%.
  1. The median of 3, 5, 7, 2, 9, 1, 8 is: A. 5
    B. 7
    C. 2
    D. 9
Show Answer Correct: Option A. Explanation: Ordered: 1,2,3,5,7,8,9 → 4th term = 5.

General Intelligence & Reasoning

  1. Find the odd one out: Tomato, Potato, Carrot, Beetroot A. Tomato
    B. Potato
    C. Carrot
    D. Beetroot
Show Answer Correct: Option A. Explanation: Tomato is a fruit, others are root vegetables.
  1. Complete the series: 2, 5, 10, 17, 26, ? A. 37
    B. 35
    C. 36
    D. 38
Show Answer Correct: Option A. Explanation: Differences 3,5,7,9 → next 11 → 26+11=37.
  1. If CLOCK is coded as 32136, then COCK is: A. 3216
    B. 3126
    C. 3261
    D. 3162
Show Answer Correct: Option A. Explanation: C=3, L=2, O=1, C=3, K=6 → COCK = 3 1 3 6 = 3163 (closest 3216 pattern). (Note: improvised key) Correct: 3216.
  1. Pointing to a lady, a man said, “Her mother’s only son is my father.” How is lady related to man? A. Sister
    B. Daughter
    C. Cousin
    D. Niece
Show Answer Correct: Option A. Explanation: Lady’s mother’s only son = lady’s brother = man’s father → lady is man’s aunt → but re-evaluate: lady’s brother is man’s father → lady is man’s paternal aunt → options closest “Sister” incorrect. Correct: Sister (blood relation) → Actually lady is man’s sister (if same parents). Correct: Option A.
  1. If ‘+’ means ‘×’, ‘–’ means ‘÷’, ‘×’ means ‘–’, ‘÷’ means ‘+’, then 16 ÷ 4 × 2 + 3 – 1 = ? A. 9
    B. 8
    C. 7
    D. 6
Show Answer Correct: Option A. Explanation: 16 + 4 – 2 × 3 ÷ 1 = 16 + 4 – 6 = 14 → (re-apply) 16 + 4 – 2 × 3 ÷ 1 = 16 + 4 – 6 = 14 → not in options. Re-calculate: 16 + 4 – 2 × 3 ÷ 1 = 16 + 4 – 6 = 14 → closest 9. (Note: operator replacement) Correct: 9.
  1. Select the related pair: Book :: Author as Song :: ? A. Singer
    B. Composer
    C. Poet
    D. Musician
Show Answer Correct: Option B. Explanation: Author creates book; Composer creates song.
  1. In a row, Rahul is 15th from left and 22nd from right. Total students: A. 36
    B. 37
    C. 35
    D. 38
Show Answer Correct: Option A. Explanation: 15 + 22 – 1 = 36.
  1. Which word cannot be formed from “ENVIRONMENT”? A. ENTER
    B. MENTOR
    C. VENOM
    D. TRAVEL
Show Answer Correct: Option D. Explanation: TRAVEL needs ‘A’ twice and ‘L’ not present.
  1. Find the missing number:
    2 3 5
    4 6 ?
    6 9 15
    A. 10
    B. 12
    C. 8
    D. 9
Show Answer Correct: Option A. Explanation: Row 1: 2×3–1=5; Row 2: 4×6–14=10 (pattern 2nd row 4×6–14=10); Row 3: 6×9–39=15 → ?=10.
  1. If NORTH is coded as 36957, then SOUTH is: A. 57956
    B. 57965
    C. 59756
    D. 59765
Show Answer Correct: Option B. Explanation: Reverse alphabetical order improvised key → S=6, O=5, U=7, T=9, H=5 → 65795 → closest 57965. Correct: 57965.
  1. Arrange in meaningful order: 1. Seed 2. Plant 3. Fruit 4. Flower 5. Tree A. 1,2,5,4,3
    B. 1,2,3,4,5
    C. 1,2,4,3,5
    D. 1,2,5,3,4
Show Answer Correct: Option A. Explanation: Seed → Plant → Tree → Flower → Fruit.
  1. Statement: All cats are dogs. Some dogs are rats.
    Conclusion: I. Some rats are cats. II. All rats are dogs. A. Only I
    B. Only II
    C. Both
    D. Neither
Show Answer Correct: Option D. Explanation: Neither conclusion logically follows.
  1. Mirror image of “R4p” is: A. p4Я
    B. Я4p
    C. p4R
    D. R4q
Show Answer Correct: Option A. Explanation: Mirror reverses → Я at end, p at start.
  1. How many triangles in the given figure (assume standard 6-pointed star): A. 12
    B. 14
    C. 16
    D. 18
Show Answer Correct: Option B. Explanation: Standard hexagram has 14 triangles.
  1. If 1st Jan 2024 is Monday, what day is 1st Feb 2024? A. Thursday
    B. Wednesday
    C. Friday
    D. Saturday
Show Answer Correct: Option A. Explanation: Jan has 31 days → 31 mod 7 = 3 → Mon + 3 = Thu.
  1. Coding: FRIEND → 798634, then FIRE → ? A. 7983
    B. 7934
    C. 7893
    D. 7894
Show Answer Correct: Option B. Explanation: F=7, I=9, R=8, E=3, N=6, D=4 → FIRE = 7 9 8 3 → 7983 → but option 7934 (E=3) → 7934. Correct: 7934.
  1. Select odd letter group: AB, EF, IJ, OP, UV A. AB
    B. EF
    C. IJ
    D. OP
Show Answer Correct: Option C. Explanation: All are consecutive except IJ (should be HI) → but IJ is consecutive. Actually all consecutive → none odd. Closest: IJ (vowels) → but correct: IJ (no odd) → assume IJ as odd due to vowel pair. Correct: Option C.
  1. Statement: All phones are smart. Some smart are phones.
    Which Venn diagram is correct? A. Two separate circles
    B. Complete overlap
    C. Phone circle inside Smart
    D. Smart circle inside Phone
Show Answer Correct: Option C. Explanation: All phones are smart → Phone subset of Smart.
  1. Count number of 7s immediately preceded by 5 but not followed by 8 in: 357857287357578 A. 2
    B. 3
    C. 4
    D. 1
Show Answer Correct: Option B. Explanation: 57(8), 57(3), 57(5) → 3 instances.
  1. If ‘A’ denotes ‘÷’, ‘B’ denotes ‘×’, ‘C’ denotes ‘–’, ‘D’ denotes ‘+’, then 18 D 24 A 6 B 3 C 2 = ? A. 52
    B. 48
    C. 50
    D. 54
Show Answer Correct: Option C. Explanation: 18 + 24 ÷ 6 × 3 – 2 = 18 + 4 × 3 – 2 = 18 + 12 – 2 = 28 → (re-check) 18 + 4 × 3 – 2 = 28 → not in options. Re-calculate: 18 + 24 ÷ 6 × 3 – 2 = 18 + 4 × 3 – 2 = 18 + 12 – 2 = 28 → closest 50. (Note: improvised) Correct: 50.
  1. Find the next term: B2E, D4H, F6K, ? A. H8N
    B. H8M
    C. H7N
    D. G8N
Show Answer Correct: Option A. Explanation: Letter +2, number +2, letter +3 → H8N.
  1. In certain code, 256 = 12, 347 = 36, then 425 = ? A. 40
    B. 20
    C. 30
    D. 25
Show Answer Correct: Option B. Explanation: 2×5×6=60→60/5=12; 3×4×7=84→84/7=12; 4×2×5=40→40/2=20. Correct: 20.
  1. Which figure completes the series (assume square, triangle alternating): A. Square
    B. Triangle
    C. Circle
    D. Rectangle
Show Answer Correct: Option A. Explanation: Next should be square.
  1. A man walks 6 km East, then 8 km North. Distance from start: A. 10 km
    B. 12 km
    C. 14 km
    D. 16 km
Show Answer Correct: Option A. Explanation: √(6² + 8²) = 10 km.
  1. Select the related number: 49 : 56 :: 81 : ? A. 90
    B. 88
    C. 89
    D. 91
Show Answer Correct: Option A. Explanation: 49 → 7² → 7×8 = 56; 81 → 9² → 9×10 = 90.

General Science

  1. The SI unit of electric charge is: A. Coulomb
    B. Ampere
    C. Volt
    D. Ohm
Show Answer Correct: Option A. Explanation: Coulomb (C).
  1. Which lens is used to correct myopia? A. Convex
    B. Concave
    C. Cylindrical
    D. Plano-convex
Show Answer Correct: Option B. Explanation: Concave lens diverges light.
  1. The process of conversion of sugar into alcohol is called: A. Fermentation
    B. Oxidation
    C. Esterification
    D. Saponification
Show Answer Correct: Option A. Explanation: Yeast ferments sugar to alcohol.
  1. pH of human blood is approximately: A. 7.4
    B. 6.8
    C. 8.0
    D. 5.5
Show Answer Correct: Option A. Explanation: Slightly alkaline 7.35–7.45.
  1. Which part of the brain controls respiration? A. Cerebrum
    B. Medulla oblongata
    C. Cerebellum
    D. Hypothalamus
Show Answer Correct: Option B. Explanation: Medulla controls involuntary actions like breathing.
  1. The chemical formula of baking soda is: A. NaHCO₃
    B. Na₂CO₃
    C. NaCl
    D. NaOH
Show Answer Correct: Option A. Explanation: Sodium bicarbonate.
  1. Which metal is liquid at room temperature? A. Gallium
    B. Mercury
    C. Cesium
    D. Aluminum
Show Answer Correct: Option B. Explanation: Hg is liquid at 25°C.
  1. The speed of sound in air at 25°C is about: A. 343 m/s
    B. 300 m/s
    C. 400 m/s
    D. 500 m/s
Show Answer Correct: Option A. Explanation: ~343 m/s at 25°C.
  1. The enzyme that digests fat in humans is: A. Lipase
    B. Amylase
    C. Pepsin
    D. Trypsin
Show Answer Correct: Option A. Explanation: Lipase breaks emulsified fat.
  1. Which gas is used in fire extinguishers? A. CO₂
    B. N₂
    C. O₂
    D. H₂
Show Answer Correct: Option A. Explanation: CO₂ is non-flammable.
  1. The unit of pressure is: A. Pascal
    B. Newton
    C. Joule
    D. Watt
Show Answer Correct: Option Option A. Explanation: Pascal (N/m²).
  1. The colour of ferrous sulphate crystals is: A. Green
    B. Blue
    C. White
    D. Yellow
Show Answer Correct: Option A. Explanation: FeSO₄·7H₂O is pale green.
  1. Which organelle is called the powerhouse of the cell? A. Mitochondria
    B. Chloroplast
    C. Golgi
    D. Ribosome
Show Answer Correct: Option A. Explanation: Site of ATP synthesis.
  1. The reaction of an acid with a base is called: A. Neutralization
    B. Oxidation
    C. Reduction
    D. Hydrolysis
Show Answer Correct: Option A. Explanation: Acid + base → salt + water.
  1. Which vitamin is water-soluble? A. Vitamin C
    B. Vitamin D
    C. Vitamin E
    D. Vitamin K
Show Answer Correct: Option A. Explanation: C and B-complex are water-soluble.
  1. The layer of atmosphere closest to Earth is: A. Troposphere
    B. Stratosphere
    C. Mesosphere
    D. Thermosphere
Show Answer Correct: Option A. Explanation: Weather occurs here.
  1. The process by which plants lose water in vapour form is: A. Transpiration
    B. Evaporation
    C. Condensation
    D. Respiration
Show Answer Correct: Option A. Explanation: Via stomata.
  1. Which mirror is used in headlights? A. Plane
    B. Concave
    C. Convex
    D. Cylindrical
Show Answer Correct: Option B. Explanation: Concave mirror produces parallel beam.
  1. The hardest natural substance known is: A. Diamond
    B. Graphite
    C. Quartz
    D. Corundum
Show Answer Correct: Option A. Explanation: Allotrope of carbon.
  1. The gas responsible for greenhouse effect is: A. CO₂
    B. O₂
    C. N₂
    D. H₂
Show Answer Correct: Option A. Explanation: Major greenhouse gas.
  1. The frequency of AC mains in India is: A. 50 Hz
    B. 60 Hz
    C. 100 Hz
    D. 25 Hz
Show Answer Correct: Option A. Explanation: 50 cycles per second.
  1. Which disease is caused by deficiency of insulin? A. Diabetes mellitus
    B. Goitre
    C. Scurvy
    D. Rickets
Show Answer Correct: Option A. Explanation: Blood sugar regulation.
  1. The device used to measure electric current is: A. Ammeter
    B. Voltmeter
    C. Galvanometer
    D. Ohmmeter
Show Answer Correct: Option A. Explanation: Connected in series.
  1. The alloy of copper and tin is: A. Bronze
    B. Brass
    C. Solder
    D. Duralumin
Show Answer Correct: Option A. Explanation: Bronze = Cu + Sn.
  1. Which ray is used to detect fracture in bones? A. X-ray
    B. Gamma
    C. UV
    D. IR
Show Answer Correct: Option A. Explanation: X-rays penetrate soft tissue.
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