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Engineering Exams RRB-JE CMA (Chemical and Metallurgical Assistant) Technical Abilities 2025 22.04.25 Paper-2 Shift-2 Medium +1 -0.33
The present accepted value of the electrical charge on an electron is ________ × 10–19 C.
Correct Answer: D. 1.602176
Explanation: The elementary charge, denoted as e, represents the magnitude of the electric charge carried by a single electron. According to the Committee on Data for Science and Technology (CODATA), the most precise and currently accepted value for this fundamental physical constant is approximately 1.602176634 x 10^-19 Coulombs. In many scientific calculations and educational contexts, this value is often rounded to 1.602 x 10^-19 C or 1.602176 x 10^-19 C for simplicity. Since option D provides the most detailed and accurate numerical representation among the choices given, it is considered the correct answer.
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