Subatomic particles
Subatomic particles is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions across 4 exam years between 2016 and 2024. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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खालीलपैकी कोणते वाक्य चुकीचे आहे ? / Which of the following sentence is wrong ?
(a)अणुकेंद्र हे प्रोटॉन व न्यूट्रॉनने बनलेले असते. / Atomic nucleus is made up of protons and neutrons.
(b)प्रोटॉनवर धनभार असतो. / Proton has a positive charge.
(c)इलेक्ट्रॉनवर ऋणभार असतो. / Electron has a negative charge.
(d)न्यूट्रॉनवर धनभार असतो. / Neutron has a positive charge.
Neutrons are neutral subatomic particles with no electrical charge, so statement (IV) claiming neutrons have a positive charge is factually incorrect.
व्यावहारिक दृष्ट्या अणूचे सारे वस्तुमान मुख्यत्वे त्याच्या पुढील कणांमध्ये एकत्रित असते... / Practically all the mass of an atom is concentrated in its
(a)प्रोटॉन / Protons
(b)न्युट्रॉन / Neutrons
(c)इलेक्ट्रॉन / Electrons
(d)वरील सर्व / All the above
Practically all the mass of an atom is concentrated in its nucleus, which consists of protons and neutrons (nucleons). Electrons have negligible mass.
पुढील दोन विधानांपैकी कोणते अयोग्य आहे ? अ. अणु अंक म्हणजे अणु केंद्रातील एकूण प्रोटॉन्सची संख्या. ब. अणु वस्तुमान म्हणजे अणु केंद्रातील एकूण प्रोटॉन्स व न्यूट्रॉन्सची संख्या. Which one of the following statements is/are incorrect ? a. The number of protons in a nucleus is called its atomic number. b. The total number of protons and neutrons constitute its mass number.
(a)अणु अंक म्हणजे अणु केंद्रातील एकूण प्रोटॉन्सची संख्या. / The number of protons in a nucleus is called its atomic number.
(b)अणु वस्तुमान म्हणजे अणु केंद्रातील एकूण प्रोटॉन्स व न्यूट्रॉन्सची संख्या. / The total number of protons and neutrons constitute its mass number.
Atomic number is indeed defined as the number of protons in the nucleus, and mass number is the sum of protons and neutrons. Both statements are correct, meaning none is incorrect.
खालील विधानें पहा : / Consider the following statements :
(a)अणू हा विद्युतभार दृष्ट्या उदासीन असतो. / An atom is electrically neutral.
(b)केंद्राभोवती फिरणाऱ्या सर्व इलेक्ट्रॉन्सचा ऋण विद्युतभार व केंद्रानावरील ऋण भार समान असतो. / The negative charge on nucleus is equal to the total negative charge of all the orbiting electrons.
An atom is electrically neutral because the positive charge on its nucleus equals the total negative charge of all orbiting electrons, making statement (a) correct and statement (b) incorrect since the nuclear charge is positive, not negative.