MPSC PYQ
Science & Technology

Atomic structure

Atomic structure is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions across 4 exam years between 2019 and 2025. Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.

Real questions
4
Years tested
4 · 2019–2025
In context
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Asked in

2025202420212019

What you need to know first

Basic ChemistryAtom definitionSubatomic particlesAtomic mass unitBasic Chemistry ConceptsBasic chemistry and physics of atomsDefinition of isotopes

What mastering this unlocks

Atomic radiusIons (Cation and Anion)Chemical BondingMolecular structureIonization energyPeriodic trendsIsotopes of HydrogenDeuteriumCarbon datingIsotopesRadioactivityLaser physicsStimulated emissionAlpha decayPenetrating power of radiationsHydrogen isotopesNuclear FissionNuclear Equations BalancingHydrogen Chemistry

Real questions that test this

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.

1)दोनही चूक / Both are incorrect
2)दोनही बरोबर / Both are correct
3)(a) बरोबर, (b) चूक / (a) correct, (b) incorrect✓ Correct
4)(a) चूक, (b) बरोबर / (a) incorrect, (b) correct

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.

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.

1)(III) व (II) / (III) and (II)
2)(II) व (I) / (II) and (I)
3)फक्त (I) / Only (I)
4)फक्त (IV) / Only (IV)✓ Correct

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

1)फक्त अ / Only a
2)फक्त अ आणि ब / Only a and b✓ Correct
3)फक्त क / Only c
4)फक्त ड / Only d

Practically all the mass of an atom is concentrated in its nucleus, which consists of protons and neutrons (nucleons). Electrons have negligible mass.

हायड्रोजनचे समस्थानिके आणि त्यांचे अनुक्रमे वस्तुमान गुणोत्तर ________ आहे. The isotopes of hydrogen and their respective mass ratio are ________.

1)(1) ड्युटेरियम, प्रोटियम, ट्रिटियम; 1 : 2 : 3 (1) Deuterium, Protium, Tritium; 1 : 2 : 3
2)(2) ट्रिटियम, ड्युटेरियम, प्रोटियम; 2 : 3 : 1 (2) Tritium, Deuterium, Protium; 2 : 3 : 1
3)(3) ट्रिटियम, प्रोटियम, ड्युटेरियम; 2 : 3 : 1 (3) Tritium, Protium, Deuterium; 2 : 3 : 1
4)(4) प्रोटियम, ड्युटेरियम, ट्रिटियम; 1 : 2 : 3 (4) Protium, Deuterium, Tritium; 1 : 2 : 3✓ Correct

The isotopes of hydrogen are Protium, Deuterium, and Tritium, with mass numbers 1, 2, and 3 respectively, giving a mass ratio of 1 : 2 : 3.

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