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  9. Q161

RRB Technician (Grade I Signal + Grade III) 2026 · Question 161 of 265

What is the main difference between isobars and isotopes?

  1. AIsobars have the same mass number but different atomic numbersCorrect
  2. BIsobars have the same number of electrons; isotopes do not
  3. CIsobars have the same atomic number; isotopes have different atomic numbers
  4. DIsobars are atoms of the same element; isotopes are of different elements

Answer: A. Isobars have the same mass number but different atomic numbers

Official answer key verified. Detailed explanation coming soon.

Source: RRB Technician Grade III 09-Mar-2026 Shift 3 (oliveboard compilation with answer key) · reliable-secondary

← Q160View full paper (265 questions)Q162 →

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