የ12ኛ ክፍል ውጤት ወጥቷል፤ ውጤትዎን የሚያዩበት መንገድ

የፈተና ወረቀቶች

የ12ኛ ክፍል ኬሚስትሪ መግቢያ ፈተና፣ 2018 ዓ.ም. (2026)፣ እትም 1

ተማሪዎች በ2018 ዓ.ም. የተፈተኑበት የ12ኛ ክፍል የኬሚስትሪ የዩኒቨርሲቲ መግቢያ ፈተና እውነተኛ ጥያቄዎች። እያንዳንዱ ጥያቄ ትክክለኛ መልስ እና የተብራራ ማብራሪያ አለው። የ2018 ዓ.ም. ፈተና በተለያዩ እትሞች ወጥቷል። ይህ ገጽ የያዘው እትም 1 ነው፤ ሌሎቹ ከታች ተዘርዝረዋል።

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  • 2018 ዓ.ም. (2026)፣ እትም 1

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ከዚህ ፈተና ጥያቄዎችን ይሞክሩ

መልሱን ከመክፈትዎ በፊት እያንዳንዱን ጥያቄ በራስዎ ይመልሱ። ማብራሪያዎቹ ወደ መማሪያ መጽሐፉ ትክክለኛ ክፍል ይጠቁማሉ፤ ስለዚህ ጥያቄ ሲስቱ የትኛውን ገጽ እንደገና ማንበብ እንዳለብዎት ያውቃሉ።

ጥያቄ 1

Who used the 'cathode ray tube' to discover the electron and determine its charge to mass ratio?

  1. A.Robert. A. Millikan
  2. B.James Chadwick
  3. C.J.J. Thomson
  4. D.Ernest Rutherford
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ C J.J. Thomson

ለምን

Thomson sent a beam through a cathode ray tube and bent it with electric and magnetic fields. From how far the beam bent he worked out the charge to mass ratio of the particles in it, and those particles are the electrons. Millikan is the tempting choice because his oil drop experiment is also about the electron, but he measured the charge on its own, not the charge to mass ratio.

ጥያቄ 2

Among the following postulates of Dalton's atomic theory, the one that was modified in the modern atomic theory is

  1. A.Atoms are indivisible
  2. B.Atoms are the smallest particle of all elements
  3. C.Atoms of more than one element combine to form compounds
  4. D.Atoms are indestructible
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ A Atoms are indivisible

ለምን

Dalton said the atom could not be broken down. The discovery of the electron, the proton and the neutron showed that it can, so that postulate had to be changed. B is the tempting one, but an atom is still the smallest particle that keeps the chemical identity of an element, so that idea survives in modern theory.

ጥያቄ 3

Which of the following statements can be used as an example to describe the law of definite proportion?

  1. A.48g of magnesium ribbon burns in excess oxygen to form 80g of magnesium oxide
  2. B.The mass in gram of oxygen to phosphorus in P4O10 to that in P4O6 is in 3:2 ratio
  3. C.White chalk consists of the elements Calcium, carbon and oxygen which are combined in the mass ratio of 10:3:12 regardless of its source.
  4. D.Water is a colorless liquid at room temperature
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ C White chalk consists of the elements Calcium, carbon and oxygen which are combined in the mass ratio of 10:3:12 regardless of its source.

ለምን

The law of definite proportion says a pure compound always holds the same elements in the same fixed mass ratio, whatever its source. Chalk always giving calcium, carbon and oxygen in a 10:3:12 mass ratio is exactly that. B is tempting, but comparing two different compounds of the same elements, P4O10P_4O_{10} against P4O6P_4O_6, is the law of multiple proportions.

ጥያቄ 4

The statement 'The properties of the elements are periodic functions of their atomic masses' is the

  1. A.Law of mass action
  2. B.Mendeleev's periodic law
  3. C.Modern periodic law
  4. D.Law of definite proportion
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ B Mendeleev's periodic law

ለምን

Mendeleev lined the elements up by increasing atomic mass and saw their properties repeat at regular intervals. That is his periodic law. C is the tempting answer, but the modern periodic law makes properties a function of atomic number, not atomic mass, and that change is what fixed the places where Mendeleev's order broke down.

ጥያቄ 5

What was the main conclusion of the Rutherford Gold Foil Experiment conducted by Ernest Rutherford?

  1. A.Electrons carry a negative charge.
  2. B.A proton is a hydrogen atom without an electron.
  3. C.Electrons move around the nucleus in fixed orbits.
  4. D.Most of the mass and all the positive charge of an atom are concentrated in a very small nucleus
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ D Most of the mass and all the positive charge of an atom are concentrated in a very small nucleus

ለምን

Most alpha particles passed straight through the gold foil, but a few came back at sharp angles. Rutherford read that to mean the atom is mostly empty space with all its positive charge and nearly all its mass packed into a very small centre, the nucleus. C is tempting, but the idea of fixed orbits came later from Bohr, not from this experiment.

ጥያቄ 6

The number of protons, neutrons and electrons respectively in Cd2+ are _____.

  1. A.48, 64, 48
  2. B.48, 64, 46
  3. C.48, 64, 50
  4. D.48, 63, 46
መልሱን እና ማብራሪያውን ይመልከቱ

መልስ፦ B 48, 64, 46

ለምን

Cadmium has atomic number 48, so every cadmium particle has 48 protons. The isotope in the question has mass number 112, so the neutron count is 112−48=64112 - 48 = 64. The 2+ charge means two electrons were lost, leaving 48−2=4648 - 2 = 46. A is tempting if you keep the electron count equal to the proton count, but that is only true for a neutral atom, not for an ion.

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በዚህ ስብስብ ያሉት 65 ጥያቄዎች ሁሉ እንደ ታትሞ የወጣ ፈተና፣ የመልስ ቁልፉም ከ65 ማብራሪያዎች ጋር እንደ ሁለተኛ ፋይል። ያትሟቸው ወይም ያለ ዳታ ያንብቧቸው።

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ሙሉውን ፈተና በሰዓት ተገድበው ይስሩ

ነጻ የ Temari መለያ ሙሉውን የኬሚስትሪ ፈተና እና የሌሎች ዓመታትንም ሁሉ በሰዓት የተገደቡ የሙከራ ፈተናዎች አድርጎ ከወዲያውኑ ውጤት ጋር ይሰጥዎታል። በማንኛውም ስልክ ላይ፣ ደካማ ግንኙነት ላይም ይሰራል።

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የ2018 ዓ.ም. ሌሎች የኬሚስትሪ ፈተናዎች

ይህን ፈተና ከመቀመጥዎ በፊት ኬሚስትሪ ያጥኑ

የ12ኛ ክፍል ኬሚስትሪ አጭር ማስታወሻዎች 22 ካርዶች አሏቸው። እያንዳንዱ ከአገር አቀፉ መጽሐፍ ምዕራፍ በምዕራፍ ተዘጋጅቶ ሕጉን፣ ምልክቶቹ ምን እንደሚወክሉና ውጤት የሚያሳጣውን ስህተት ይናገራል።

የኬሚስትሪ ማስታወሻዎችን ይክፈቱ
እነዚህ እውነተኛዎቹ የ2018 ዓ.ም. የኬሚስትሪ መግቢያ ፈተና ጥያቄዎች ናቸው?

አዎ። ተማሪዎች በ2018 ዓ.ም. (2026) ከተፈተኑበት ብሔራዊ የዩኒቨርሲቲ መግቢያ የኬሚስትሪ ፈተና የተወሰዱ ናቸው። ስብስባችን ከጥያቄዎቹ 65 ያህሉን ይዟል፤ እያንዳንዱም መልስና ወደ መማሪያ መጽሐፉ የሚጠቁም ማብራሪያ አለው።

ሙሉውን ፈተና እንዴት እለማመዳለሁ?

በስልክ ቁጥር ነጻ መለያ ይክፈቱ። ሙሉው ፈተና በሰዓት የተገደበ የሙከራ ፈተና ሆኖ ወዲያውኑ ውጤት ይሰጣል፣ በወር 199 ብር የሆነው የ AI አጋዥ ማሻሻያም ያመለጠዎትን ሁሉ ያስረዳዎታል።

የ2018 ዓ.ም. የኬሚስትሪ ፈተናን በ PDF ማውረድ እችላለሁ?

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