APPSC Paper I · Paper I · Topic 2

2 APPSC Paper I General Science & Technology questions with answers

21 questions from APPSC Paper I Mock 1 with answers and APPSC EO Grade III 2026 Paper I question paper with answers. Try each one, then tap Show answer.

Previous-paper questions are as in the original paper. Medha AI wrote the answers and explanations.

2.1Physics in daily lifeNotes

  1. Q1 Paper I Mock 1, Q22

    Which of the following pairs is NOT correctly matched?

    1. APitch of a sound - Frequency
    2. BLoudness of a sound - Amplitude
    3. CRange of hearing of humans - About 20 Hz to 20,000 Hz
    4. DWaves used by bats to navigate - Infrasound
    Show answerHide answer

    Answer D. Waves used by bats to navigate - Infrasound

    Bats emit and detect ultrasonic waves (above 20 kHz) to locate obstacles and prey, not infrasound.

    Source: NCERT Class 9 Science, Sound

  2. Q2 Paper I Mock 1, Q29

    Consider the following statements about a rainbow:

    1. A rainbow is seen in the part of the sky opposite to the Sun.

    2. It is formed by dispersion, refraction and internal reflection of sunlight in raindrops.

    Which of the statements given above is/are correct?

    1. A1 only
    2. B2 only
    3. CBoth 1 and 2
    4. DNeither 1 nor 2
    Show answerHide answer

    Answer C. Both 1 and 2

    Raindrops act like tiny prisms: sunlight is refracted and dispersed on entering, reflected inside and refracted again on leaving, and the bow is seen with the Sun behind the observer.

    Source: NCERT Class 10 Science, The Human Eye and the Colourful World

  3. Q3 EO Grade III 2026 Paper I, Q18

    Which gas is the most abundant in Sun ?

    1. AOxygen
    2. BNitrogen
    3. CHelium
    4. DHydrogen
    Show answerHide answer

    Answer D. Hydrogen

    The Sun is about 73% hydrogen and 25% helium by mass.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q20, final key

  4. Q4 EO Grade III 2026 Paper I, Q19

    A sensitive magnetic field instrument can be effectively shielded from the external magnetic field by placing it inside which of the following materials ?

    1. APlastic Material
    2. BTeak Wood
    3. CSoft Iron of high permeability
    4. DA metal of high conductivity
    Show answerHide answer

    Answer C. Soft Iron of high permeability

    High-permeability soft iron draws magnetic field lines into itself, so the space inside an iron enclosure is shielded.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q21, final key

  5. Q5 EO Grade III 2026 Paper I, Q20

    What is the principle behind thermocouple ?

    1. AJoule effect
    2. BThomson effect
    3. CSeebeck effect
    4. DPeltier effect
    Show answerHide answer

    Answer C. Seebeck effect

    A thermocouple produces an emf when its two junctions are at different temperatures: the Seebeck effect.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q22, final key

  6. Q6 EO Grade III 2026 Paper I, Q22

    The combination of which of the following processes results in the formation of a rainbow ?

    1. ADispersion and Total Internal Reflection
    2. BDispersion and Absorption
    3. CRefraction and Scattering
    4. DDispersion and Focussing
    Show answerHide answer

    Answer A. Dispersion and Total Internal Reflection

    Sunlight is refracted and dispersed on entering a raindrop and internally reflected at its back before leaving.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q25, final key

2.2Chemistry in daily lifeNotes

  1. Q7 Paper I Mock 1, Q23

    Consider the following statements about artificial sweeteners:

    1. The use of aspartame is limited to cold foods and soft drinks because it is unstable at cooking temperature.

    2. Sucralose is stable at cooking temperature.

    3. Saccharin is less sweet than cane sugar.

    Which of the statements given above are correct?

    1. A1 and 2 only
    2. B2 and 3 only
    3. C1 and 3 only
    4. D1, 2 and 3
    Show answerHide answer

    Answer A. 1 and 2 only

    Aspartame breaks down on heating, so it is used in cold foods and drinks; sucralose is stable at cooking temperature. Saccharin is about 550 times sweeter than cane sugar, so statement 3 is wrong.

    Source: NCERT Class 12 Chemistry ch.16 (Chemistry in Everyday Life)

  2. Q8 Paper I Mock 1, Q30

    LPG has almost no smell of its own, so a strong-smelling compound is added to it so that leaks can be detected. This compound is

    1. AEthyl mercaptan (ethanethiol)
    2. BMethyl isocyanate
    3. CAmmonia
    4. DHydrogen sulphide
    Show answerHide answer

    Answer A. Ethyl mercaptan (ethanethiol)

    A small amount of ethyl mercaptan, a sulphur compound with a strong unpleasant smell, is added to LPG as an odorant.

    Source: Standard chemistry (LPG odorisation, IS 4576)

  3. Q9 EO Grade III 2026 Paper I, Q16

    The drum of a Photostat machine is made up of which one of the following elements ?

    1. ASelenium
    2. BAluminium
    3. CBarium
    4. DMagnesium
    Show answerHide answer

    Answer A. Selenium

    Selenium is photoconductive, so it was used to coat photocopier drums.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q16, final key

  4. Q10 EO Grade III 2026 Paper I, Q21

    Which of the following Gas is produced when Baking soda is heated ?

    1. ACarbon monoxide
    2. BCarbon dioxide
    3. CNitrogen
    4. DHydrogen
    Show answerHide answer

    Answer B. Carbon dioxide

    2NaHCO3 → Na2CO3 + H2O + CO2 on heating.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q23, final key

2.3Biology, human body & healthNotes

  1. Q11 Paper I Mock 1, Q24

    Match List I (Organism) with List II (Kingdom):

    List I:

    • A. Amoeba
    • B. Yeast
    • C. Nostoc (cyanobacterium)
    • D. Fern

    List II:

    • 1. Monera
    • 2. Protista
    • 3. Fungi
    • 4. Plantae

    Select the correct answer:

    1. AA-1, B-3, C-2, D-4
    2. BA-2, B-1, C-3, D-4
    3. CA-3, B-2, C-1, D-4
    4. DA-2, B-3, C-1, D-4
    Show answerHide answer

    Answer D. A-2, B-3, C-1, D-4

    Amoeba is a unicellular eukaryote (Protista), yeast is a fungus, cyanobacteria such as Nostoc are prokaryotes (Monera), and ferns are plants.

    Source: NCERT Class 11 Biology, Biological Classification

  2. Q12 Paper I Mock 1, Q31

    The structural and functional unit of the human kidney is the:

    1. ANephron
    2. BNeuron
    3. CAlveolus
    4. DVillus
    Show answerHide answer

    Answer A. Nephron

    Each kidney has a large number of nephrons, which filter blood and form urine.

    Source: NCERT Class 10 Science, Life Processes

  3. Q13 EO Grade III 2026 Paper I, Q17

    Which one of the following bacteria present in the soil produces a peculiar smell if it rains on parched soil ?

    1. ADiplomycetes
    2. BStaphymycetes
    3. CStreptomycetes
    4. DMicrococcus
    Show answerHide answer

    Answer C. Streptomycetes

    Streptomyces bacteria release geosmin, which gives the earthy smell (petrichor) after rain on dry soil.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q18, final key

2.7Space & defence technologyNotes

  1. Q14 Paper I Mock 1, Q25

    Match List I (mission) with List II (launch vehicle):

    List I

    a. Chandrayaan-1

    b. Chandrayaan-3

    c. Aditya-L1

    d. Mangalyaan

    List II

    I. LVM3-M4

    II. PSLV-C25

    III. PSLV-C11

    IV. PSLV-C57

    1. Aa-III, b-I, c-IV, d-II
    2. Ba-III, b-I, c-II, d-IV
    3. Ca-I, b-III, c-IV, d-II
    4. Da-II, b-I, c-IV, d-III
    Show answerHide answer

    Answer A. a-III, b-I, c-IV, d-II

    Chandrayaan-1 flew on PSLV-C11, Chandrayaan-3 on LVM3-M4, Aditya-L1 on PSLV-C57 and Mangalyaan on PSLV-C25.

    Source: ISRO mission pages

2.10Nuclear & energy technologyNotes

  1. Q15 Paper I Mock 1, Q26

    Assertion (A): Heavy industries and thermal power stations are usually located on or near coalfields.

    Reason (R): Coal is a bulky material that loses weight on use as it is reduced to ash.

    Choose the correct option.

    1. ABoth A and R are true, and R is the correct explanation of A
    2. BBoth A and R are true, but R is NOT the correct explanation of A
    3. CA is true, but R is false
    4. DA is false, but R is true
    Show answerHide answer

    Answer A. Both A and R are true, and R is the correct explanation of A

    Both are true and R explains A: since coal is bulky and weight-losing, it is cheaper to set up plants near the coalfields.

    Source: NCERT Class 10 Contemporary India II p.64

2.11Biotechnology & healthNotes

  1. Q16 Paper I Mock 1, Q27

    Match the following diseases with their vector or carrier:

    List I

    a. Malaria

    b. Dengue

    c. Kala-azar

    d. Amoebiasis

    List II

    I. Sandfly

    II. Housefly (mechanical carrier)

    III. Female Anopheles mosquito

    IV. Female Aedes mosquito

    1. Aa-IV, b-III, c-I, d-II
    2. Ba-III, b-IV, c-II, d-I
    3. Ca-III, b-I, c-IV, d-II
    4. Da-III, b-IV, c-I, d-II
    Show answerHide answer

    Answer D. a-III, b-IV, c-I, d-II

    Malaria is spread by female Anopheles, dengue by female Aedes, kala-azar by sandflies, and houseflies carry the amoebiasis parasite to food.

    Source: NCERT Class 12 Biology p.143; NCERT Class 8 Science (old) p.37; NCERT Class 11 Biology p.56; NCERT Class 12 Biology p.144

2.12ICT, AI & cyber securityNotes

  1. Q17 Paper I Mock 1, Q28

    Match the following with the person associated with them:

    List I

    a. World Wide Web

    b. Linux operating system kernel

    c. First network e-mail using '@'

    d. Analytical Engine

    List II

    I. Charles Babbage

    II. Ray Tomlinson

    III. Tim Berners-Lee

    IV. Linus Torvalds

    1. Aa-IV, b-III, c-II, d-I
    2. Ba-III, b-IV, c-II, d-I
    3. Ca-III, b-IV, c-I, d-II
    4. Da-III, b-II, c-IV, d-I
    Show answerHide answer

    Answer B. a-III, b-IV, c-II, d-I

    Tim Berners-Lee invented the WWW, Linus Torvalds created Linux, Ray Tomlinson sent the first network e-mail with '@', and Charles Babbage designed the Analytical Engine.

    Source: NCERT Class 12 Fundamentals of Human Geography p.78

  2. Q18 EO Grade III 2026 Paper I, Q23

    Digiboxx an alternative to google drive, provides 20 GB of free cloud storage was launched by

    1. AFacebook
    2. BNITI Aayog
    3. CC-DAC
    4. DAmazon
    Show answerHide answer

    Answer B. NITI Aayog

    DigiBoxx, an Indian cloud storage platform, was launched by NITI Aayog in 2020.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q27, final key

  3. Q19 EO Grade III 2026 Paper I, Q24

    Which of the following is equal to One Byte ?

    1. AString of four bits
    2. BString of eight bits
    3. CString of twelve bits
    4. DString of sixteen bits
    Show answerHide answer

    Answer B. String of eight bits

    One byte = 8 bits.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q28, final key

  4. Q20 EO Grade III 2026 Paper I, Q25

    Out of the following who has devised the logical operators AND, OR and NOT ?

    1. AGeorge Boole
    2. BCharles Babbage
    3. CHermen Hollerith
    4. DVannever Bush
    Show answerHide answer

    Answer A. George Boole

    George Boole developed Boolean algebra with the AND, OR and NOT operations.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q29, final key

  5. Q21 EO Grade III 2026 Paper I, Q138

    Nation wide mobile number portability has been operational form

    1. AJuly 9th 2015
    2. BJuly 7th 2015
    3. CJuly 5th 2015
    4. DJuly 3rd 2015
    Show answerHide answer

    Answer D. July 3rd 2015

    Full (pan-India) mobile number portability, letting users keep their number when moving to another circle, began on 3 July 2015.

    Source: APPSC EO Grade III 2026 Paper I (Notification 10/2025), Q148, final key

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