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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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%
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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°
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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%
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option B. Explanation: Common code 2 in first & third.
  1. Mirror image of figure ‘F’ is:
    A. F
    B. ɟ
    C. Ⅎ
    D. 𝟍
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option A. Explanation: A is maternal uncle.
  1. Select pair with same relation: Odometer : Distance :: Compass : ?
    A. Speed
    B. Direction
    C. Time
    D. Energy
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option A. Explanation: 5! / 2! = 60.
  1. Find the missing letter: C, F, I, L, ?
    A. O
    B. P
    C. Q
    D. R
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option B. Explanation: Weber (Wb).
  1. Which enzyme is present in saliva?
    A. Pepsin
    B. Amylase
    C. Lipase
    D. Trypsin
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option C. Explanation: Slightly alkaline.
  1. Which metal is liquid at room temperature?
    A. Gallium
    B. Mercury
    C. Cesium
    D. Rubidium
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option C. Explanation: Medulla controls involuntary actions.
  1. The chemical formula of baking soda is:
    A. Na₂CO₃
    B. NaHCO₃
    C. NaCl
    D. NaOH
Show Answer Correct: Option B. Explanation: Sodium bicarbonate.
  1. Which vitamin is fat-soluble?
    A. Vitamin C
    B. Vitamin B₁₂
    C. Vitamin D
    D. Vitamin B₆
Show Answer Correct: 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
Show Answer Correct: Option B. Explanation: Coulomb (C).
  1. Which disease is caused by deficiency of iodine?
    A. Scurvy
    B. Goitre
    C. Rickets
    D. Anaemia
Show Answer Correct: 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
Show Answer Correct: 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
Show Answer Correct: Option B. Explanation: ATP synthesis.
  1. The element with atomic number 79 is:
    A. Silver
    B. Gold
    C. Platinum
    D. Mercury
Show Answer Correct: Option B. Explanation: Au.
  1. Which ray is used in barcode scanners?
    A. UV
    B. IR
    C. Laser
    D. X-ray
Show Answer Correct: 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
Show Answer Correct: Option C. Explanation: Both forces together.
  1. Which fibre is of animal origin?
    A. Jute
    B. Cotton
    C. Silk
    D. Hemp
Show Answer Correct: Option C. Explanation: Silk from silkworm.
  1. The chemical name of vitamin B₁ is:
    A. Riboflavin
    B. Niacin
    C. Thiamine
    D. Pyridoxine
Show Answer Correct: Option C. Explanation: Thiamine.
  1. Which gas is responsible for global warming?
    A. Nitrogen
    B. Oxygen
    C. Carbon dioxide
    D. Hydrogen
Show Answer Correct: Option C. Explanation: Greenhouse gas.
  1. The device used to measure electric current is:
    A. Voltmeter
    B. Ammeter
    C. Galvanometer
    D. Ohmmeter
Show Answer Correct: 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
Show Answer Correct: Option A. Explanation: Citric acid.
  1. The human body’s largest organ is:
    A. Liver
    B. Brain
    C. Skin
    D. Lung
Show Answer Correct: 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
Show Answer Correct: Option C. Explanation: Glucose stores chemical energy.