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Practice questions

General Science practice questions (Group 4)

Questions 8 to 14 of 20

By TNPSC Guide editorial team · Last updated:

  1. Question 8

    What are the elements of group 17 of the modern periodic table called?

    1. A. Noble gases
    2. B. The chalcogen family
    3. C. Halogens
    4. D. Alkali metals
    Answer and explanation

    Correct answer: C. Halogens

    Group 17 is the halogens, group 18 the noble gases, group 16 the oxygen (chalcogen) family and group 1 the alkali metals.

    Source: அறிவியல், பத்தாம் வகுப்பு, தமிழ் வழி (Science, Standard X, Tamil medium; Samacheer Kalvi) (அலகு 8 தனிமங்களின் ஆவர்த்தன வகைப்பாடு, p. 105 (PDF p. 113))

  2. Question 9

    What is the dental formula of the rabbit?

    1. A. 2023/1023
    2. B. 2033/1023
    3. C. 2133/1023
    4. D. 2033/1033
    Answer and explanation

    Correct answer: B. 2033/1023

    The rabbit's dental formula is I 2/1, C 0/0, PM 3/2, M 3/3, that is 2033/1023; it has no canines.

    Source: அறிவியல், பத்தாம் வகுப்பு, தமிழ் வழி (Science, Standard X, Tamil medium; Samacheer Kalvi) (அலகு 13 உயிரினங்களின் அமைப்பு நிலைகள், p. 191 (PDF p. 199))

  3. Question 10

    Which of these is not one of the kingdoms of the five-kingdom classification?

    1. A. Monera
    2. B. Viruses
    3. C. Protista
    4. D. Fungi
    Answer and explanation

    Correct answer: B. Viruses

    The five kingdoms are Monera, Protista, Fungi, Plantae and Animalia; viruses are not among them.

    Source: அறிவியல், ஒன்பதாம் வகுப்பு, தமிழ் வழி (Science, Standard IX, Tamil medium; Samacheer Kalvi) (அலகு 17 விலங்குலகம், p. 202 (PDF p. 206))

  4. Question 11

    In binomial nomenclature, what does the first name, which begins with a capital letter, stand for?

    1. A. The species
    2. B. The kingdom
    3. C. The genus
    4. D. The family
    Answer and explanation

    Correct answer: C. The genus

    In binomial nomenclature the first name is the genus, with a capital first letter; the second is the species, written in small letters.

    Source: அறிவியல், ஒன்பதாம் வகுப்பு, தமிழ் வழி (Science, Standard IX, Tamil medium; Samacheer Kalvi) (அலகு 17 விலங்குலகம், p. 205 (PDF p. 209))

  5. Question 12

    Which mineral works as the main component of haemoglobin?

    1. A. Iron
    2. B. Iodine
    3. C. Calcium
    4. D. Potassium
    Answer and explanation

    Correct answer: A. Iron

    Among the minerals, iron works as the main component of haemoglobin; its lack causes anaemia.

    Source: அறிவியல், ஒன்பதாம் வகுப்பு, தமிழ் வழி (Science, Standard IX, Tamil medium; Samacheer Kalvi) (அலகு 21 ஊட்டச்சத்து மற்றும் ஆரோக்கியம், p. 255 (PDF p. 259))

  6. Question 13

    On a vernier caliper one smallest main-scale division is 0.5 mm and the vernier scale has 50 divisions in all. What is its least count?

    1. A. 0.1 mm
    2. B. 25 mm
    3. C. 0.01 mm
    4. D. 0.05 mm
    Answer and explanation

    Correct answer: C. 0.01 mm

    Least count = value of one smallest main-scale division / total vernier divisions = 0.5 mm / 50 = 0.01 mm.

    Source: அறிவியல், ஒன்பதாம் வகுப்பு, தமிழ் வழி (Science, Standard IX, Tamil medium; Samacheer Kalvi) (அலகு 1 அளவீடு, p. 5 (PDF p. 9))

  7. Question 14

    Which instrument is used to measure the diameter of a thin wire or the thickness of a thin metal sheet?

    1. A. Barometer
    2. B. Lactometer
    3. C. Screw gauge
    4. D. Thermometer
    Answer and explanation

    Correct answer: C. Screw gauge

    A screw gauge measures the diameter of a thin wire or the thickness of a thin metal sheet; it has a U-shaped metal frame.

    Source: அறிவியல், ஒன்பதாம் வகுப்பு, தமிழ் வழி (Science, Standard IX, Tamil medium; Samacheer Kalvi) (அலகு 1 அளவீடு, p. 7 (PDF p. 11))

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