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State PCS PYQPrelims 2024

BPSC – Combined Competitive Examination · ಪ್ರಶ್ನೆ 1

Dalton's atomic theory successfully explained: i. Law of conservation of mass ii. Law of constant composition iii. Law of radioactivity iv. Law of multiple proportions

  1. ii, iii and iv
  2. i, ii and iii
  3. i, ii and iv
  4. i, iii and iv
ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ

ಉತ್ತರ: (C) i, ii and iv

ವಿವರಣೆ

Dalton's indivisible-atom theory explained the laws of chemical combination, not radioactivity (which shows atoms can break down).

  • (A) ತಪ್ಪು

    Wrong: radioactivity was discovered later and contradicts indivisible atoms.

  • (B) ತಪ್ಪು

    Wrong: Dalton's theory could not explain radioactivity.

  • (C) ಸರಿ

    Correct: the theory explained conservation of mass, constant composition and multiple proportions.

  • (D) ತಪ್ಪು

    Wrong: radioactivity is not explained by it.