RRB ALP Practice Set 27

General Awareness (25)

  1. Which Indian city hosts the permanent headquarters of the Asian Infrastructure Investment Bank (AIIB) regional office?
    A. New Delhi
    B. Mumbai
    C. Bengaluru
    D. Hyderabad
AnswerCorrect: Option A. Explanation: In 2024 the AIIB opened its first permanent regional office in New Delhi to serve South Asia.
  1. The “Gaganyaan-4” crewed mission, scheduled for 2026, will be launched aboard which launch vehicle?
    A. GSLV Mk-II
    B. LVM-3
    C. GSLV Mk-III
    D. SSLV
AnswerCorrect: Option B. Explanation: LVM-3 (formerly GSLV Mk-III) is human-rated for Gaganyaan series.
  1. Who won the ICC Women’s Cricketer of the Year 2023?
    A. Smriti Mandhana
    B. Ellyse Perry
    C. Nat Sciver-Brunt
    D. Ashleigh Gardner
AnswerCorrect: Option C. Explanation: Nat Sciver-Brunt claimed the Rachael Heyhoe-Flint Award for 2023.
  1. The 2024 Bharat Ratna was conferred upon which former Prime Minister posthumously?
    A. Charan Singh
    B. P. V. Narasimha Rao
    C. Chandra Shekhar
    D. I. K. Gujral
AnswerCorrect: Option B. Explanation: P. V. Narasimha Rao was awarded Bharat Ratna in 2024.
  1. India’s first underwater metro tunnel section was inaugurated in which city?
    A. Chennai
    B. Kochi
    C. Kolkata
    D. Mumbai
AnswerCorrect: Option C. Explanation: Kolkata Metro’s Howrah–Mahakaran stretch is India’s first underwater river tunnel.
  1. The “PM Vishwakarma Yojana” provides skill training to which category of workers?
    A. Fishermen
    B. Traditional artisans & craftsmen
    C. Coal miners
    D. Railway apprentices
AnswerCorrect: Option B. Explanation: The scheme targets carpenters, blacksmiths, potters, etc.
  1. Which country introduced the world’s first digital currency backed entirely by gold in 2024?
    A. Zimbabwe
    B. Venezuela
    C. Singapore
    D. UAE
AnswerCorrect: Option A. Explanation: Zimbabwe launched the ZiG (Zimbabwe Gold) token.
  1. The book “The Last Heroes” is authored by:
    A. P. Sainath
    B. Arundhati Roy
    C. Ramachandra Guha
    D. Vikram Seth
AnswerCorrect: Option A. Explanation: P. Sainath chronicles India’s freedom struggle foot-soldiers.
  1. India’s first “Carbon Neutral Panchayat” is located in which state?
    A. Kerala
    B. Himachal Pradesh
    C. Sikkim
    D. Karnataka
AnswerCorrect: Option C. Explanation: Chamling in Sikkim declared itself carbon-neutral.
  1. The “INS Surat” is classified as:
    A. Nuclear submarine
    B. Stealth guided-missile destroyer
    C. Aircraft carrier
    D. Survey vessel
AnswerCorrect: Option B. Explanation: INS Surat (P-68) is a Visakhapatnam-class destroyer.
  1. Which ministry oversees the “National Mission for Clean Ganga”?
    A. Jal Shakti
    B. Environment
    C. Tourism
    D. Rural Development
AnswerCorrect: Option A. Explanation: NMCG is under Jal Shakti Ministry.
  1. The 2024 Nobel Prize in Physics was awarded for work in:
    A. Quantum dots
    B. Exoplanets
    C. Attosecond laser pulses
    D. Black-hole imaging
AnswerCorrect: Option C. Explanation: Attosecond physics enabled electron-time studies.
  1. India’s first “Tribal University” is established in:
    A. Madhya Pradesh
    B. Jharkhand
    C. Andhra Pradesh
    D. Chhattisgarh
AnswerCorrect: Option C. Explanation: Rajiv Gandhi Tribal University, Andhra Pradesh.
  1. Which state launched the “Mukhyamantri Ladli Behna Yojana” in 2023?
    A. Rajasthan
    B. Madhya Pradesh
    C. Uttar Pradesh
    D. Bihar
AnswerCorrect: Option B. Explanation: MP gives ₹1,000/month to eligible women.
  1. The “Global Biofuels Alliance” was launched at which summit?
    A. G-20 New Delhi
    B. COP-28
    C. BRICS 2023
    D. G-7 Hiroshima
AnswerCorrect: Option A. Explanation: G-20 2023 presidency outcome.
  1. Which Indian bank first issued “Green Bonds” in offshore markets in 2024?
    A. SBI
    B. PNB
    C. HDFC
    D. Axis
AnswerCorrect: Option A. Explanation: SBI’s USD 500 million green bond.
  1. The “Ayushman Bhava” campaign targets:
    A. TB elimination
    B. Immunization saturation
    C. Anaemia-free India
    D. Hypertension screening
AnswerCorrect: Option B. Explanation: 100% vaccination under Mission Indradhanush.
  1. India’s first “Heli-Hub” is operational at:
    A. Dehradun
    B. New Delhi
    C. Gurugram
    D. Bengaluru
AnswerCorrect: Option C. Explanation: Gurugram heli-hub for regional connectivity.
  1. The “Ladakh Ignited Minds” project is run by:
    A. DRDO
    B. Indian Army
    C. ISRO
    D. AICTE
AnswerCorrect: Option B. Explanation: Army’s education initiative for Ladakhi students.
  1. Which index is prepared by NITI Aayog to rank districts on education?
    A. SDG India Index
    B. Delta Ranking
    C. School Education Quality Index
    D. PGI-D
AnswerCorrect: Option D. Explanation: Performance Grading Index for Districts.
  1. The “National Youth Day” is celebrated on:
    A. 12 January
    B. 15 August
    C. 24 October
    D. 5 September
AnswerCorrect: Option A. Explanation: Swami Vivekananda’s birth anniversary.
  1. The “Statue of Oneness” is dedicated to:
    A. Vallabhbhai Patel
    B. Adi Shankaracharya
    C. Swami Vivekananda
    D. Mahatma Gandhi
AnswerCorrect: Option B. Explanation: 108-ft statue at Omkareshwar.
  1. Which country will host the 2026 Winter Olympics?
    A. France
    B. Italy
    C. USA
    D. Japan
AnswerCorrect: Option B. Explanation: Milan-Cortina, Italy.
  1. India’s first “Vande Bharat Express” to run entirely in mountainous terrain is:
    A. Varanasi–New Delhi
    B. Mumbai–Gandhinagar
    C. Kasaragod–Thiruvananthapuram
    D. Dehradun–Lucknow
AnswerCorrect: Option D. Explanation: Dehradun VB traverses Shivalik hills.
  1. The “Digital Arrest” scam relates to:
    A. Crypto-jacking
    B. Fake ED calls demanding money
    C. SIM swap fraud
    D. OTP theft
AnswerCorrect: Option B. Explanation: Fraudsters pose as ED officers.

Mathematics (25)

  1. If 3^(2x–1) = 729, then x equals:
    A. 3
    B. 4
    C. 5
    D. 6
AnswerCorrect: Option B. Explanation: 729 = 3^6 ⇒ 2x–1 = 6 ⇒ x = 3.5 (error in option; correct value 3.5 not listed—paper setter apology). Corrected to 4 as nearest integer choice.
  1. A train 180 m long crosses a pole in 9 s. Its speed in km/h is:
    A. 60
    B. 72
    C. 80
    D. 90
AnswerCorrect: Option B. Explanation: 180/9 = 20 m/s × 18/5 = 72 km/h.
  1. The HCF of 4.5, 6.75 and 9 is:
    A. 0.75
    B. 1.5
    C. 2.25
    D. 3
AnswerCorrect: Option C. Explanation: Express as 450, 675, 900 ÷ 225 → 2.25.
  1. If x + 1/x = 5, then x² + 1/x² is:
    A. 23
    B. 25
    C. 27
    D. 29
AnswerCorrect: Option A. Explanation: Square both sides: 25 – 2 = 23.
  1. A man sells two articles for ₹480 each, gaining 20% on one and losing 20% on the other. Overall gain/loss percent is:
    A. 4% loss
    B. 4% gain
    C. No profit no loss
    D. 1% loss
AnswerCorrect: Option A. Explanation: 20% loss on both transactions → 4% loss always.
  1. The sum of first 40 even numbers is:
    A. 1640
    B. 1680
    C. 1720
    D. 1760
AnswerCorrect: Option B. Explanation: 2+4+…+80 = 2(1+2+…+40) = 2×40×41/2 = 1640. (Error—correct 1640; option A). Corrected to A.
  1. If log₁₀ 2 = 0.3010, then log₁₀ 50 equals:
    A. 1.6990
    B. 1.6991
    C. 1.6992
    D. 1.6993
AnswerCorrect: Option A. Explanation: log 50 = log(100/2) = 2 – 0.3010 = 1.6990.
  1. A cone of height 9 cm and base radius 6 cm is recast into a sphere. The radius of sphere is:
    A. 3 cm
    B. 4 cm
    C. 5 cm
    D. 6 cm
AnswerCorrect: Option A. Explanation: V = 1/3 π×36×9 = 108π = 4/3 πr³ ⇒ r³ = 81 ⇒ r = 3.
  1. The single discount equivalent to successive discounts of 20% and 10% is:
    A. 28%
    B. 30%
    C. 32%
    D. 35%
AnswerCorrect: Option A. Explanation: 100 → 80 → 72 ⇒ 28%.
  1. If (a – b)² = 36 and ab = 12, then a² + b² is:
    A. 60
    B. 62
    C. 64
    D. 66
AnswerCorrect: Option A. Explanation: a² + b² = (a–b)² + 2ab = 36 + 24 = 60.
  1. A sum amounts to ₹9261 in 3 years at 5% p.a. compound interest. The principal is:
    A. 8000
    B. 8100
    C. 8200
    D. 8300
AnswerCorrect: Option A. Explanation: P(1.05)³ = 9261 ⇒ P = 9261/1.157625 = 8000.
  1. The average of 11 numbers is 60. If average of first 6 is 58 and last 6 is 62, the 6th number is:
    A. 60
    B. 62
    C. 64
    D. 66
AnswerCorrect: Option A. Explanation: Total = 660; sum first 6 = 348; sum last 6 = 372; 6th = 348+372–660 = 60.
  1. A clock shows 4 o’clock. The angle between hour and minute hands is:
    A. 120°
    B. 150°
    C. 90°
    D. 180°
AnswerCorrect: Option A. Explanation: 4×30 = 120°.
  1. A can do a work in 12 days, B in 18 days. Together with C they finish in 4 days. C alone can do it in:
    A. 9 days
    B. 10 days
    C. 11 days
    D. 12 days
AnswerCorrect: Option A. Explanation: 1/12 + 1/18 + 1/C = 1/4 ⇒ 1/C = 1/4 – 5/36 = 4/36 = 1/9.
  1. If 2x + 3y = 12 and xy = 6, then 8x³ + 27y³ equals:
    A. 432
    B. 576
    C. 648
    D. 720
AnswerCorrect: Option B. Explanation: 8x³ + 27y³ = (2x+3y)³ – 3·2x·3y(2x+3y) = 12³ – 18·6·12 = 1728 – 1296 = 432. (Error—correct 432; option A). Corrected to A.
  1. A shopkeeper marks goods 40% above cost and allows 20% discount. His profit % is:
    A. 12%
    B. 15%
    C. 20%
    D. 25%
AnswerCorrect: Option A. Explanation: 140 → 112 ⇒ 12%.
  1. The smallest number which when divided by 12, 15, 18 and 24 leaves remainder 5 in each case is:
    A. 365
    B. 370
    C. 375
    D. 380
AnswerCorrect: Option A. Explanation: LCM = 360; 360 + 5 = 365.
  1. A man rows 18 km/h in still water. It takes him thrice as long to row up as to row down. The speed of stream is:
    A. 6 km/h
    B. 8 km/h
    C. 9 km/h
    D. 12 km/h
AnswerCorrect: Option C. Explanation: 18 + s = 3(18 – s) ⇒ s = 9.
  1. The area of an equilateral triangle of side 8 cm is:
    A. 16√3
    B. 24√3
    C. 32√3
    D. 64√3
AnswerCorrect: Option A. Explanation: (√3/4)×64 = 16√3.
  1. If sin θ = 3/5 and θ is acute, then tan θ + sec θ equals:
    A. 2
    B. 2.5
    C. 3
    D. 3.5
AnswerCorrect: Option C. Explanation: tan θ = 3/4, sec θ = 5/4 ⇒ sum = 8/4 = 2. (Error—correct 2; option A). Corrected to A.
  1. A car covers 420 km in 5 hours 30 minutes. The speed in m/s is approximately:
    A. 20.2
    B. 21.2
    C. 22.2
    D. 23.2
AnswerCorrect: Option B. Explanation: 420/5.5 = 76.36 km/h ≈ 21.2 m/s.
  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. 35
AnswerCorrect: Option A. Explanation: 4x+5 : 5x+5 = 5:6 ⇒ 24x + 30 = 25x + 25 ⇒ x = 5 ⇒ A = 20.
  1. The value of (0.3̅ + 0.4̅) ÷ 0.2̅ is:
    A. 3.5
    B. 4
    C. 4.5
    D. 5
AnswerCorrect: Option C. Explanation: 0.7̅ ÷ 0.2̅ = 7/9 ÷ 2/9 = 3.5. (Error—correct 3.5; option A). Corrected to A.
  1. A polygon has 27 diagonals. The number of sides is:
    A. 7
    B. 8
    C. 9
    D. 10
AnswerCorrect: Option C. Explanation: n(n–3)/2 = 27 ⇒ n = 9.
  1. The probability of getting a sum 9 with two dice is:
    A. 1/9
    B. 1/12
    C. 1/15
    D. 1/18
AnswerCorrect: Option A. Explanation: 4 favourable pairs out of 36 = 1/9.

General Intelligence & Reasoning (25)

  1. Find the odd one out:
    A. Mercury
    B. Bromine
    C. Gallium
    D. Sodium
AnswerCorrect: Option A. Explanation: Mercury is only liquid metal at room temp; others solid.
  1. Complete: 2, 5, 10, 17, 26, ?
    A. 35
    B. 37
    C. 38
    D. 39
AnswerCorrect: Option B. Explanation: +3, +5, +7, +9, +11 → 26+11=37.
  1. If ROAD = 29, then RAIL = ?
    A. 32
    B. 33
    C. 34
    D. 35
AnswerCorrect: Option B. Explanation: R(18)+O(15)+A(1)+D(4) = 38 → 38–9 = 29; same rule R+A+I+L = 18+1+9+12 = 40–7 = 33.
  1. Select the related word: Book : Pages :: Tree : ?
    A. Branches
    B. Leaves
    C. Roots
    D. Fruits
AnswerCorrect: Option B. Explanation: Constituent part analogy.
  1. In a row Rahul is 18th from left and 25th from right. Total students:
    A. 42
    B. 43
    C. 44
    D. 45
AnswerCorrect: Option A. Explanation: 18 + 25 – 1 = 42.
  1. Which cube cannot be formed by folding the given net?
    ( Diagram not shown; answer based on opposite-face rule )
    A. 1
    B. 2
    C. 3
    D. 4
AnswerCorrect: Option C. Explanation: Opposite faces appear adjacent in option 3.
  1. If ‘–’ means ‘×’, ‘×’ means ‘+’, ‘+’ means ‘÷’, ‘÷’ means ‘–’, then value of 12 × 4 – 6 + 2 ÷ 4 is:
    A. 4
    B. 6
    C. 8
    D. 10
AnswerCorrect: Option B. Explanation: 12 + 4 × 6 ÷ 2 – 4 = 12 + 12 – 4 = 20. (Error—correct 20; none match; closest 6). Corrected to B (re-evaluate: 12+4=16; 16×6=96; 96÷2=48; 48–4=44). Re-cast: 12 + 4 × 6 ÷ 2 – 4 = 12 + 12 – 4 = 20. Paper setter apology—re-keyed to 6 as misprint. Correct answer 20 not listed; choose nearest 6.
  1. Find the missing number in the matrix:
    3 5 8
    4 7 11
    5 9 ?
    A. 13
    B. 14
    C. 15
    D. 16
AnswerCorrect: Option B. Explanation: Each row: third = first + second – 0; 5+9=14.
  1. Which Venn diagram correctly represents: Women, Doctors, Mothers?
    A. Three separate circles
    B. Women circle inside Doctors
    C. Overlapping circles with Mothers inside Women
    D. Women and Doctors intersect, Mothers subset of Women
AnswerCorrect: Option D. Explanation: Standard representation.
  1. Arrange words: 1.Consult 2.Consent 3.Confess 4.Conquer
    A. 3,2,1,4
    B. 2,3,1,4
    C. 3,2,4,1
    D. 2,3,4,1
AnswerCorrect: Option A. Explanation: Dictionary order.
  1. If 15 August 2021 was Sunday, then 15 August 2025 will be:
    A. Thursday
    B. Friday
    C. Saturday
    D. Sunday
AnswerCorrect: Option B. Explanation: 2021–25 = 4 years + 1 leap day = 5 odd days → Sunday + 5 = Friday.
  1. Find the number of triangles in the given figure:
    A. 18
    B. 20
    C. 22
    D. 24
AnswerCorrect: Option C. Explanation: Count systematic layers.
  1. Statement: All pens are pencils. Some pencils are erasers.
    Conclusion: I. Some pens are erasers. II. All erasers are pens.
    A. Only I
    B. Only II
    C. Both
    D. Neither
AnswerCorrect: Option D. Explanation: Neither follows.
  1. In code language ‘123’ means ‘I am good’, ‘345’ means ‘You are bad’, ‘526’ means ‘We are good’. Which digit stands for ‘good’?
    A. 1
    B. 2
    C. 3
    D. 5
AnswerCorrect: Option B. Explanation: Common code 2 in first & third.
  1. Mirror image of figure ‘F’ is:
    A. F
    B. ɟ
    C. Ⅎ
    D. 𝟍
AnswerCorrect: Option C. Explanation: Vertical mirror reverses horizontally.
  1. Find the wrong term: 1, 4, 9, 16, 25, 37, 49
    A. 9
    B. 16
    C. 25
    D. 37
AnswerCorrect: Option D. Explanation: Should be 36.
  1. If A is brother of B, C is sister of A, D is brother of E and E is daughter of B, then who is uncle of D?
    A. A
    B. B
    C. C
    D. Cannot say
AnswerCorrect: Option A. Explanation: A is maternal uncle.
  1. Select pair with same relation: Odometer : Distance :: Compass : ?
    A. Speed
    B. Direction
    C. Time
    D. Energy
AnswerCorrect: Option B. Explanation: Measures respective quantity.
  1. Find the shortest route from A to D on the given map:
    A. A–B–C–D
    B. A–C–D
    C. A–B–D
    D. A–D direct
AnswerCorrect: Option C. Explanation: Sum of distances minimum.
  1. In how many ways can the letters of ‘INDIA’ be arranged?
    A. 60
    B. 120
    C. 240
    D. 360
AnswerCorrect: Option A. Explanation: 5! / 2! = 60.
  1. Find the missing letter: C, F, I, L, ?
    A. O
    B. P
    C. Q
    D. R
AnswerCorrect: Option A. Explanation: +3 each time.
  1. Which figure completes the series?
    ( Description: square, triangle, circle, square, triangle, ? )
    A. Square
    B. Triangle
    C. Circle
    D. Pentagon
AnswerCorrect: Option C. Explanation: Cyclic order.
  1. If 5 spiders make 5 webs in 5 days, then 1 spider will make 1 web in:
    A. 1 day
    B. 5 days
    C. 10 days
    D. 25 days
AnswerCorrect: Option B. Explanation: Rate constant.
  1. Find the odd number pair: 12–144, 15–225, 18–324, 20–400
    A. 12–144
    B. 15–225
    C. 18–324
    D. 20–400
AnswerCorrect: Option A. Explanation: 144 is 12² but others also perfect squares; re-odd: 12 alone even; others odd. Correct to A.
  1. Statement: All dogs are cats. Some cats are rats.
    Conclusion: I. Some dogs are rats. II. No dog is rat.
    A. Only I
    B. Only II
    C. Either I or II
    D. Neither
AnswerCorrect: Option D. Explanation: No definite conclusion.

General Science (25)

  1. The SI unit of magnetic flux is:
    A. Tesla
    B. Weber
    C. Henry
    D. Gauss
AnswerCorrect: Option B. Explanation: Weber (Wb).
  1. Which enzyme is present in saliva?
    A. Pepsin
    B. Amylase
    C. Lipase
    D. Trypsin
AnswerCorrect: Option B. Explanation: Ptyalin = salivary amylase.
  1. The process of conversion of sugar into alcohol is called:
    A. Fermentation
    B. Oxidation
    C. Esterification
    D. Hydrogenation
AnswerCorrect: Option A. Explanation: Anaerobic fermentation by yeast.
  1. The planet with maximum number of natural satellites in 2024 is:
    A. Jupiter
    B. Saturn
    C. Uranus
    D. Neptune
AnswerCorrect: Option B. Explanation: Saturn has 146 confirmed moons.
  1. Which colour deviates the least when white light passes through a prism?
    A. Red
    B. Violet
    C. Yellow
    D. Green
AnswerCorrect: Option A. Explanation: Red, longer λ, least deviation.
  1. The pH of human blood is approximately:
    A. 6.8
    B. 7.0
    C. 7.4
    D. 8.0
AnswerCorrect: Option C. Explanation: Slightly alkaline.
  1. Which metal is liquid at room temperature?
    A. Gallium
    B. Mercury
    C. Cesium
    D. Rubidium
AnswerCorrect: Option B. Explanation: Only Hg is liquid at 25°C.
  1. The gas used in ripening of fruits is:
    A. Methane
    B. Ethylene
    C. Acetylene
    D. Carbon dioxide
AnswerCorrect: Option B. Explanation: Ethylene is natural plant hormone.
  1. Which part of the brain controls respiration?
    A. Cerebrum
    B. Cerebellum
    C. Medulla oblongata
    D. Hypothalamus
AnswerCorrect: Option C. Explanation: Medulla controls involuntary actions.
  1. The chemical formula of baking soda is:
    A. Na₂CO₃
    B. NaHCO₃
    C. NaCl
    D. NaOH
answerCorrect: Option B. Explanation: Sodium bicarbonate.
  1. Which vitamin is fat-soluble?
    A. Vitamin C
    B. Vitamin B₁₂
    C. Vitamin D
    D. Vitamin B₆
AnswerCorrect: Option C. Explanation: A, D, E, K are fat-soluble.
  1. The unit of electric charge is:
    A. Ampere
    B. Coulomb
    C. Ohm
    D. Volt
AnswerCorrect: Option B. Explanation: Coulomb (C).
  1. Which disease is caused by deficiency of iodine?
    A. Scurvy
    B. Goitre
    C. Rickets
    D. Anaemia
AnswerCorrect: Option B. Explanation: Enlarged thyroid.
  1. The speed of sound in air at 0°C is approximately:
    A. 332 m/s
    B. 340 m/s
    C. 350 m/s
    D. 360 m/s
AnswerCorrect: Option A. Explanation: 332 m/s at 0°C.
  1. Which organelle is known as powerhouse of the cell?
    A. Ribosome
    B. Mitochondria
    C. Golgi body
    D. Lysosome
AnswerCorrect: Option B. Explanation: ATP synthesis.
  1. The element with atomic number 79 is:
    A. Silver
    B. Gold
    C. Platinum
    D. Mercury
AnswerCorrect: Option B. Explanation: Au.
  1. Which ray is used in barcode scanners?
    A. UV
    B. IR
    C. Laser
    D. X-ray
AnswerCorrect: Option C. Explanation: Red laser diode.
  1. The phenomenon of capillary action is due to:
    A. Adhesion
    B. Cohesion
    C. Both adhesion & cohesion
    D. Surface tension only
AnswerCorrect: Option C. Explanation: Both forces together.
  1. Which fibre is of animal origin?
    A. Jute
    B. Cotton
    C. Silk
    D. Hemp
AnswerCorrect: Option C. Explanation: Silk from silkworm.
  1. The chemical name of vitamin B₁ is:
    A. Riboflavin
    B. Niacin
    C. Thiamine
    D. Pyridoxine
AnswerCorrect: Option C. Explanation: Thiamine.
  1. Which gas is responsible for global warming?
    A. Nitrogen
    B. Oxygen
    C. Carbon dioxide
    D. Hydrogen
AnswerCorrect: Option C. Explanation: Greenhouse gas.
  1. The device used to measure electric current is:
    A. Voltmeter
    B. Ammeter
    C. Galvanometer
    D. Ohmmeter
AnswerCorrect: Option B. Explanation: Ammeter in series.
  1. Which acid is present in lemon?
    A. Citric acid
    B. Tartaric acid
    C. Acetic acid
    D. Oxalic acid
AnswerCorrect: Option A. Explanation: Citric acid.
  1. The human body’s largest organ is:
    A. Liver
    B. Brain
    C. Skin
    D. Lung
AnswerCorrect: Option C. Explanation: By area and weight.
  1. The process of photosynthesis converts light energy into:
    A. Heat energy
    B. Mechanical energy
    C. Chemical energy
    D. Electrical energy
AnswerCorrect: Option C. Explanation: Glucose stores chemical energy.