MPSC PYQ

Atomic mass

Atomic mass is a Science & Technology concept from the MPSC syllabus, tested in 4 past MPSC questions (2013, 2019, 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
3 · 2013–2025
In context
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What you need to know first

Basic atomic structure

Real questions that test this

खालील धातू विचारत घ्या. (a) प्लॅटिनम (b) सोने (c) तांबे (d) शिसे चढत्या धनतेनुसार त्यांची क्रमवारी लिहा : Consider the following metals : (a) Platinum (b) Gold (c) Copper (d) Lead Their correct arrangement in the increasing order of density is :

(a)प्लॅटिनम / Platinum

(b)सोने / Gold

(c)तांबे / Copper

(d)शिसे / Lead

1)(c), (d), (b), (a)✓ Correct
2)(d), (c), (b), (a)
3)(a), (b), (c), (d)
4)(c), (d), (a), (b)

Platinum has the highest density among the given metals, followed by gold, lead, and copper. Arranging them in increasing order gives copper, lead, gold, and platinum.

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.

Carbon compounds are broadly classified into two main categories : 1. Organic compounds : These contain carbon and hydrogen and may also include other elements like oxygen, nitrogen, sulfur etc. They include hydrocarbons (such as methane, ethane, propane), alcohols, acids and polymers (like plastics, rubber). Organic compounds are essential in biological systems, forming the basis of molecules like proteins, carbohydrates, lipids and nucleic acids (DNA and RNA). They are also used widely in industries for example, in the manufacture of fuels, dyes, medicines, pesticides and plastics. 2. Inorganic compounds : These include compounds like Carbon dioxide (CO2), Carbon Monoxide (CO), carbonates (such as calcium carbonate in limestone) and bicarbonates. These compounds are vital in geological and environmental processes, such as the carbon cycle, which maintains the balance of carbon in the eco-system. Carbon compounds exhibit various properties, most organic compounds have low melting and boiling points, are generally flammable and more soluble in organic solvents rather than water. This makes them useful as fuels and industrial solvents. Their diversity and reactivity make them a central part of the field of chemistry, particularly in synthetic and pharmaceutical industries.

कार्बनचा अणुक्रमांक किती आहे ? What is the atomic number of carbon ?

1)04
2)06✓ Correct
3)08
4)12

Carbon is a chemical element with the symbol C and atomic number 6, meaning it has 6 protons in its nucleus.

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