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#english Grammar

Subject-Verb Agreement

Because countable nouns can be either singular or plural, it is very important to use the correct subject-verb agreement when they are functioning as the subject of a clause.

Subject-verb agreement refers to using certain conjugations of verbs for singular subjects and using other conjugations for plural subjects. This happens most noticeably with the verb to be, which becomes is or was with singular subject nouns and are or were with plural subjects.

For example:
• “My brother is back from college.” (singular present simple tense)
• “The company was in financial trouble.” (singular past simple tense)
• “Many people are getting frustrated with the government.” (plural present simple tense)
• “The computers were rather old.” (plural past simple tense)

For any other verb, we only need to make a change if it is in the present simple tense. For most verbs, this is accomplished by adding an “-s” to the end if it is singular and leaving it in its base form if it is plural. For example:
• “My father runs his own business.” (singular)
• “But his sons run it when he’s away.” (plural)

• “The dog wags his tail when he is happy.” (singular)
“Dogs sometimes wag their tails when they’re angry or scared.” (plural)

The verbs have and do also only conjugate for singular subjects in the present simple tense, but they have irregular forms for this: has and does. For example:
• “The apple has a mark on it.” (singular)
• “All the apples have marks on them.” (plural)

• “The teacher does not think it’s a good idea.” (singular)
• “The other teachers do not mind, though.” (plural)


Finally, the modal auxiliary verbs will, would, shall, should, can, could, might, and must do not conjugate for singular vs. plural subjects—they always remain the same. For instance:
• “This phone can also surf the Internet!” (singular)
• “Most phones can do that now.” (plural)

• “The president will arrive in Malta next week.” (singular)
• “The other diplomats will arrive shortly after that.” (plural)


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chemistry EUEE Questions

1. The first atomic theory was proposed by:
  (A) Niels Bohr
  (B) Ernest Rutherford
  (C) John Dalton
  (D) J.J. Thomson

2. Dalton's atomic theory stated that all atoms of a given element are:
  (A) Different in size
  (B) Different in mass
  (C) Identical in mass and properties
  (D) Composed of smaller particles

3. Who discovered the electron?
  (A) Ernest Rutherford
  (B) James Chadwick
  (C) J.J. Thomson
  (D) Max Planck

4. Thomson's atomic model is known as the:
  (A) Nuclear model
  (B) Planetary model
  (C) Plum pudding model
  (D) Quantum mechanical model

5. Rutherford's gold foil experiment led to the discovery of the:
  (A) Electron
  (B) Neutron
  (C) Nucleus
  (D) Proton

6. Rutherford's atomic model proposed that the atom is mostly:
  (A) Solid
  (B) Liquid
  (C) Empty space
  (D) Filled with electrons

7. Which particle is NOT found in the nucleus of an atom?
  (A) Proton
  (B) Neutron
  (C) Electron
  (D) Nucleon

8. The atomic number of an element represents the number of:
  (A) Neutrons in the nucleus
  (B) Protons in the nucleus
  (C) Electrons in the outermost shell
  (D) Total number of particles in the nucleus

9. Isotopes of an element have the same number of:
  (A) Neutrons
  (B) Protons
  (C) Mass number
  (D) Both protons and neutrons

10. Who proposed that electrons orbit the nucleus in specific energy levels or shells?
  (A) Ernest Rutherford
  (B) J.J. Thomson
  (C) Niels Bohr
  (D) Max Planck

11. Bohr's atomic model successfully explained the:
  (A) Spectra of all elements
  (B) Spectra of hydrogen
  (C) Existence of isotopes
  (D) Wave nature of electrons

12. In Bohr's model, electrons can move to a higher energy level by:
  (A) Emitting energy
  (B) Absorbing energy
  (C) Colliding with other electrons
  (D) Moving closer to the nucleus

13. The quantum mechanical model of the atom treats electrons as:
  (A) Particles only
  (B) Waves only
  (C) Both particles and waves
  (D) Neither particles nor waves

14. Which principle states that it is impossible to know both the exact position and momentum of an electron simultaneously?
  (A) Pauli Exclusion Principle
  (B) Hund's Rule
  (C) Heisenberg Uncertainty Principle
  (D) Aufbau Principle

15. Atomic orbitals are regions of space where there is a high probability of finding:
  (A) Protons
  (B) Neutrons
  (C) Electrons
  (D) The nucleus

16. Which quantum number describes the shape of an atomic orbital?
  (A) Principal quantum number (n)
  (B) Azimuthal quantum number (l)
  (C) Magnetic quantum number (ml)
  (D) Spin quantum number (ms)

17. The maximum number of electrons that can occupy a p subshell is:
  (A) 2
  (B) 4
  (C) 6
  (D) 10

18. Which rule states that electrons will individually occupy each orbital within a subshell before doubling up in any one orbital?
  (A) Pauli Exclusion Principle
  (B) Hund's Rule
  (C) Heisenberg Uncertainty Principle
  (D) Aufbau Principle

19. According to the Aufbau principle, electrons fill orbitals in order of:
  (A) Increasing energy
  (B) Decreasing energy
  (C) Increasing atomic number
  (D) Decreasing atomic number

20. What does the Pauli Exclusion Principle state?
  (A) Electrons must fill the lowest energy levels first
  (B) No two electrons in the same atom can have the same set of four quantum numbers
  (C) Electrons must occupy each orbital within a subshell individually before pairing up
  (D) It is impossible to know both the exact position and momentum of an electron simultaneously

Answers:

1. C
2. C
3. C
4. C
5. C
6. C
7. C
8. B
9. B
10. C
11. B
12. B
13. C
14. C
15. C
16. B
17. C
18. B
19. A
20. B

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📌 Chemistry Grade 9 - Unit 1: Chemistry and Its Importance


1. What is the scope of chemistry?

A) Only studying chemical reactions
B) Studying matter and its changes
C) Ignoring the environment
D) Focusing on physics

2. How is chemistry related to other natural sciences?

A) It has no connection to other sciences
B) It overlaps with biology
C) It is independent of other sciences
D) It interacts with physics and biology
3. What role does chemistry play in production and society?

A) None
B) Minimal impact
C) Significant impact
D) Negative impact only
4. Which of the following is a common chemical industry in Ethiopia?

A) Textile manufacturing
B) Agriculture
C) Mining
D) Leather processing
5. The modern periodic table is based on the work of:

A) Lavoisier
B) Rutherford
C) Mendeleev
D) Dalton
6. Which type of bonding involves the transfer of electrons?

A) Covalent bonding
B) Ionic bonding
C) Metallic bonding
D) Hydrogen bonding
7. What is the composition of an atom with the same number of protons but different neutrons?

A) Ion
B) Isotope
C) Molecule
D) Compound
8. Who proposed the fundamental laws of chemical reactions?

A) Avogadro
B) Boyle
C) Lavoisier
D) Mendeleev
9. Which subatomic particle has a positive charge?

A) Proton
B) Neutron
C) Electron
D) Nucleus
10. What is the main focus of chemistry?

A) Studying plants
B) Studying animals
C) Studying matter and its changes
D) Studying weather patterns
11. Which element is essential for all organic compounds?

A) Nitrogen
B) Carbon
C) Oxygen
D) Hydrogen
12. What is the relationship between chemistry and biology?

A) They are completely unrelated
B) Chemistry is a subset of biology
C) Biology is a subset of chemistry
D) They overlap in the study of living organisms
13. Which scientist is known for his contributions to the atomic theory?

A) Aristotle
B) Democritus
C) Newton
D) Galileo
14. What is the significance of Mendeleev's periodic table?

A) It classified elements based on atomic number
B) It arranged elements by increasing atomic mass
C) It predicted the properties of undiscovered elements
D) It focused only on metals
15. How does chemistry impact society?

A) It has no relevance in daily life
B) It influences medicine and technology
C) It is limited to laboratories
D) It only affects the environment negatively
16. Which type of bonding involves the sharing of electrons?

A) Ionic bonding
B) Covalent bonding
C) Metallic bonding
D) Van der Waals bonding
17. What is the smallest unit of an element that retains its chemical properties?

A) Atom
B) Molecule
C) Compound
D) Ion
18. What is the most abundant element in the universe?

A) Hydrogen
B) Oxygen
C) Carbon
D) Nitrogen
19. Who discovered the electron?

A) Rutherford
B) Thomson
C) Dalton
D) Mendeleev

20. Which type of bonding is found in metals?

A) Ionic bonding
B) Covalent bonding
C) Metallic bonding
D) Polar covalent bonding

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#permutations, #combinations, and #probability

1. How many different ways can you arrange the letters in the word "MATH"?

(a) 6
(b) 12
(c) 24
(d) 30

2. A committee of 3 people is to be chosen from a group of 8 people. How many different committees are possible?

(a) 24
(b) 56
(c) 336
(d) 6720

3. What is the probability of rolling a 6 on a standard six-sided die?

(a) 1/2
(b) 1/3
(c) 1/6
(d) 1/4
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4. A bag contains 5 red balls and 3 blue balls. If you draw one ball at random, what is the probability that it is blue?

(a) 5/8
(b) 3/8
(c) 5/3
(d) 3/5

5. How many different 3-digit numbers can be formed using the digits 1, 2, 3, 4, and 5, if repetition of digits is allowed?

(a) 125
(b) 60
(c) 15
(d) 243

6. A coin is flipped twice. What is theh probability of getting at least one head?

(a) 1/4
(b) 1/2
(c) 3/4
(d) 1

7. A box contains 4 green marbles, 5 blue marbles, and 6 red marbles. If you select two marbles at random without replacement, what is the probability that both are green?

(a) 4/15
(b) 2/35
(c) 16/225
(d) 1/15

8. In how many ways can 5 different books be arranged on a shelf if a specific book must be at the beginning?

(a) 24
(b) 120
(c) 5
(d) 6

9. A standard deck of cards has 52 cards. What is the probability of drawing an Ace or a King?

(a) 2/13
(b) 1/26
(c) 4/13
(d) 1/13

10. You have 7 friends, and you want to invite 3 of them to a party. How many different groups of friends can you invite?

(a) 21
(b) 35
(c) 210
(d) 7!

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#permutations, #combinations, and #probability

1. How many different ways can you arrange the letters in the word "MATH"?

(a) 6
(b) 12
(c) 24
(d) 30

2. A committee of 3 people is to be chosen from a group of 8 people. How many different committees are possible?

(a) 24
(b) 56
(c) 336
(d) 6720

3. What is the probability of rolling a 6 on a standard six-sided die?

(a) 1/2
(b) 1/3
(c) 1/6
(d) 1/4

4. A bag contains 5 red balls and 3 blue balls. If you draw one ball at random, what is the probability that it is blue?

(a) 5/8
(b) 3/8
(c) 5/3
(d) 3/5

5. How many different 3-digit numbers can be formed using the digits 1, 2, 3, 4, and 5, if repetition of digits is allowed?

(a) 125
(b) 60
(c) 15
(d) 243

6. A coin is flipped twice. What is theh probability of getting at least one head?

(a) 1/4
(b) 1/2
(c) 3/4
(d) 1

7. A box contains 4 green marbles, 5 blue marbles, and 6 red marbles. If you select two marbles at random without replacement, what is the probability that both are green?

(a) 4/15
(b) 2/35
(c) 16/225
(d) 1/15

8. In how many ways can 5 different books be arranged on a shelf if a specific book must be at the beginning?

(a) 24
(b) 120
(c) 5
(d) 6

9. A standard deck of cards has 52 cards. What is the probability of drawing an Ace or a King?

(a) 2/13
(b) 1/26
(c) 4/13
(d) 1/13

10. You have 7 friends, and you want to invite 3 of them to a party. How many different groups of friends can you invite?

(a) 21
(b) 35
(c) 210
(d) 7!

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Репост из: QUBEE ACADEMY
The process by which RNA is made from DNA is called:
👍 Transcription
🤯 Translation
🔥 Replication
🙏 Mutation

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Репост из: QUBEE ACADEMY
Relative Pronouns Join @qubeeacademy.pdf
717.2Кб
#English Short note
#Topic: Relative Pronouns

Credit: @qubeeacademy

#Qubeeacademy
#Explanation
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Репост из: QUBEE ACADEMY
Biology Grade 11 Unit 4 part 4
Protein synthesis

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▌Multiple-Choice Questions (MCQs) Biology Unit 3 Energy Transformation

#Target Grade #12

1. Which of the following best defines metabolism?
a) The breakdown of complex molecules
b) The sum of all chemical reactions within a cell
c) The synthesis of biomolecules
d) The process of releasing energy

2. How does anabolism differ from catabolism?
a) Anabolism releases energy, while catabolism consumes energy.
b) Anabolism is a constructive process, while catabolism is a destructive process.
c) Anabolism occurs in mitochondria, while catabolism occurs in chloroplasts.
d) Anabolism breaks down glucose, while catabolism builds proteins.

3. In what part of a plant does photosynthesis primarily occur?
a) Root
b) Stem
c) Leaf
d) Flower

4. What is the primary function of stomata in leaves?
a) Absorbing sunlight
b) Regulating gas exchange and controlling water loss
c) Synthesizing chlorophyll
d) Storing carbohydrates

5. Which layer of a leaf contains the highest concentration of chloroplasts?
a) Spongy mesophyll
b) Palisade mesophyll
c) Epidermis
d) Cuticle

6. In which of the following organisms is chlorophyll "a" found?
a) All plants, algae, and cyanobacteria
b) Only green algae
c) Rhodophyta
d) Fungi

7. What is the function of carotenoids in photosynthesis?
a) They serve as primary light absorbers.
b) They act as accessory pigments that transfer energy to chlorophyll.
c) They function as waterproofing agents in leaves.
d) They act as enzymes for glucose synthesis.

8. Where do light-dependent reactions occur?
a) Stroma
b) Thylakoid membrane
c) Mitochondria
d) Cytoplasm

9. Where does the Calvin cycle (light-independent reactions) occur?
a) Thylakoid lumen
b) Stroma
c) Grana
d) Epidermis

10. Which of the following is produced during the light-dependent reactions?
a) CO₂
b) ATP and NADPH
c) Glucose
d) O₂ only

▌Answers and Explanations

1. Answer: b) The sum of all chemical reactions within a cell
Explanation: Metabolism encompasses both catabolic (breakdown) and anabolic (synthesis) reactions.

2. Answer: b) Anabolism is a constructive process, while catabolism is a destructive process.
Explanation: Anabolism builds complex molecules (e.g., proteins), whereas catabolism breaks them down.

3. Answer: c) Leaf
Explanation: Leaves contain mesophyll cells, which are rich in chloroplasts, the site of photosynthesis.

4. Answer: b) Regulating gas exchange and controlling water loss
Explanation: Stomata, controlled by guard cells, regulate CO₂ intake and the release of O₂ and H₂O.

5. Answer: b) Palisade mesophyll
Explanation: Palisade cells are densely packed with chloroplasts to maximize light absorption.

6. Answer: a) All plants, algae, and cyanobacteria
Explanation: Chlorophyll "a" is the primary photosynthetic pigment in most photosynthetic organisms.

7. Answer: b) They act as accessory pigments that transfer energy to chlorophyll.
Explanation: Carotenoids absorb wavelengths of light that chlorophyll cannot and transfer the energy.

8. Answer: b) Thylakoid membrane
Explanation: Light-dependent reactions utilize the thylakoid membranes to capture light energy.

9. Answer: b) Stroma
Explanation: The stroma contains the enzymes necessary for glucose synthesis during the Calvin cycle.

10. Answer: b) ATP and NADPH
Explanation: ATP and NADPH produced during the light-dependent reactions provide the energy and reducing power to drive the Calvin cycle; O₂ is a byproduct.

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Chemistry Grade 11 Unit 2 MCQ with explanation
#Target Grade #11 #12

1. Which compound contains a coordinate covalent bond?
A. O₂
B. NH₄⁺
C. CO₂
D. NaCl

2. Which molecule is polar?
A. CCl₄
B. CO₂
C. NH₃
D. CH₄

3. Which compound has both ionic and covalent bonds?
A. MgO
B. CH₃OH
C. KNO₃
D. Cl₂

4. Which molecule has a linear geometry?
A. H₂O
B. CO₂
C. NH₃
D. CH₄

5. What is the bond order in O₂⁺?
A. 2.5
B. 3.0
C. 1.5
D. 2.0

Answers and Explanations:

1. Answer: B. NH₄⁺
Explanation: NH₄⁺ has a coordinate covalent bond. This bond occurs when one atom provides both electrons for the shared pair, in this case, from NH₃ to H⁺.

2. Answer: C. NH₃

3. Answer: C. KNO₃
Explanation: KNO₃ contains ionic bonds between the K⁺ cation and the NO₃⁻ anion. Within the NO₃⁻ anion, covalent bonds exist between the nitrogen and oxygen atoms.

4. Answer: B. CO₂
Explanation: CO₂ is linear due to sp hybridization of the central carbon atom. Each carbon atom is double bonded to the Oxygen atoms.

5. Answer: A. 2.5

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#NationalExam

" ፈተናው ስታንዳርዱን ፣ ደህንነቱንና ሚስጢራዊነቱን ጠብቆ በመዘጋጀት ላይ ይገኛል " - የትምህርት ምዘናና ፈተናዎች አገልግሎት

የ2017 ዓ.ም የ12ኛ ክፍል ሀገር አቀፍ ፈተና ሁሉም ተማሪዎች በተማሩበት ሥርዓተ ትምህርት ይዘት እየተዘጋጀ እንደሆነ የትምህርት ምዘናና ፈተናዎች አገልግሎት አሳውቋል።

አገልግሎቱ ፤ " የ2017 ዓ.ም ተፈታኝ ተማሪዎች ከ9ኛ - 10ኛ በነባሩ ሥርዓተ ትምህርት፣ ከ11ኛ - 12ኛ ደግሞ በአዲሱ ሥርዓተ ትምህርት የተማሩ ናቸው " ብሏል።

" ነገር ግን በ2015 ዓ.ም በመላ ሀገሪቱ በናሙናነት በተመረጡ ት/ቤቶች የስርዓተ ትምህርት የሙከራ ትግበራ ላይ የተሳተፉ ት/ቤቶች ላይ የነበሩ ተማሪዎች 10ኛ ከፍልን በአዲሱ ሥርዓተ ትምህርት የተማሩ ናቸው " ሲል ገልጿል።

በአማራ ክልል በ2016 የትምህርት ዘመን መፈተን ሲገባቸው በጸጥታ ችግር ምክንያት ሳይፈተኑ የቀሩና የ11ኛ ክፍልን በነባሩ ሥርዓተ ትምህርት የተማሩ ት/ቤቶች ላይ የነበሩ ተማሪዎች በ2017 ዓ.ም የሚፈተኑ እንዳሉም ጠቁሟል።

በዚህም " የ2017 ዓ.ም የሁለተኛ ደረጃ መልቀቂያ ፈተና ከላይ የተገለጹትን ሶስቱንም ነባራዊ ሁኔታዎች ከግምት ውስጥ ባስገባ እና ሁሉንም የዘመኑን ተፈታኝ ተማሪዎች በማከለ መንገድ ስታንዳርዱን ፣ ደህንነቱንና ሚስጢራዊነቱን ጠብቆ በመዘጋጀት ላይ ይገኛል " ሲል አሳውቋል።

የፈተና ዝግጅቱ፡-

1) ከ9ኛ ከፍል ሙሉ በሙሉ ከነባሩ ሥርዓተ ትምህርት፣

2) ከ10ኛ ክፍል በነባሩና በአዲሱ ሥርዓተ ትምህርት ላይ ተመሳሳይ ይዘቶች፣

3) ከ11ኛ ከፍል በነባሩና በአዲሱ ሥርዓተ ትምህርት ላይ ተመሳሳይ ይዘቶች፣

4) ከ12ኛ ከፍል ሙሉ በሙሉ ከአዲሱ ሥርዓተ ትምህርት መሰረት የሚዘጋጅ እንደሆነ ተገልጿል።

ከላይ የተዘረዘረው የዝግጅት ሂደት በሁሉም የትምህርት ዓይነቶች ላይ እንደተጠበቀ ሆኖ የኢኮኖሚክስ የትምህርት ዓይነት ግን በስርዓተ ትምህርቱ አዲስ የተጀመረ ከመሆኑ ጋር ተያይዞ በ12ኛ ክፍል ይዘት ላይ ብቻ ተመስርቶ የሚዘጋጅ እንደሆነ ተመላክቷል።

በአጠቃላይ ሁሉም ተማሪዎች ከ9ኛ -12ኛ ክፍል በየተማሩበት የሥርዓተ ትምህርት ይዘት ላይ መመስረት ፈተናው እንደሚዘጋጅ አውቀው ተገቢውን ዝግጅት እንዲያደርጉ አገልግሎት መ/ቤቱ አሳስቧል።

ተማሪዎች አስፈላጊውን ዝግጅት እንዲያደርጉ ወላጆች፣ መምህራንና መላው የትምህርት ማህበረሰብ ተገቢውን ድጋፍ እንዲያደርጉ ጥሪ ተላልፏል።

የዘንድሮ ሀገር አቀፉ የ12ክፍል መልቀቂያ ብሔራዊ ፈተና መቼ እንደሚሰጥ እስካሁን የተወሰነ ነገር የለም።

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#Chemistry Grade 11 Unit 2 MCQ with answers and Explanation
#Target grade: Grade 11 and 12


1. Which type of chemical bond involves a "sea of delocalized electrons"?
A. Ionic
B. Covalent
C. Metallic
D. Hydrogen

2. Which pair of elements is most likely to form a covalent compound?
A. Sodium and Chlorine
B. Carbon and Oxygen
C. Magnesium and Oxygen
D. Potassium and Fluorine

3. How many lone pairs of electrons are present in the Lewis structure of water (H₂O)?
A. 1
B. 2
C. 3
D. 4

4. Which molecule violates the octet rule?
A. CH₄
B. BF₃
C. NH₃
D. CO₂

5. Which of the following is a property of ionic compounds?
A. Low melting point
B. Conducts electricity in solid state
C. Soluble in organic solvents
D. Forms crystals

6. Which bond is the most polar?
A. H-Cl
B. H-O
C. H-F
D. H-N

7. Which compound contains a coordinate covalent bond?
A. O₂
B. NH₄⁺
C. CO₂
D. NaCl

8. How many resonance structures does the nitrate ion (NO₃⁻) have?
A. 1
B. 2
C. 3
D. 4

Answers and Explanations:

1. Answer: C. Metallic bonds are characterized by delocalized electrons in metals.

2. Answer: B. Nonmetals (C and O) share electrons covalently.

3. Answer: B. Oxygen has two lone pairs in H₂O.

4. Answer: B. BF₃ has only six electrons around boron.

5. Answer: D. Ionic compounds form crystalline solids.

6. Answer: C. H-F has the greatest electronegativity difference.

7. Answer: B. NH₄⁺ has a coordinate bond from H⁺ to NH₃.

8. Answer: C. NO₃⁻ exhibits three resonance structures.


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Репост из: QUBEE ACADEMY
1. Tola can choose tea, coffee, or milk with bread, cake, or sandwich. How many breakfast combinations does he have?
A) 3
B) 6
C) 9
D) 12

Answer: C) 9

2. How many 4-digit numbers can be formed from 1,3,5,7,8,9 (no repetition) if they must be even?
A) 60
B) 120
C) 240
D) 360

Answer: A) 60

3. If P(A) = 0.3 and P(B) = 0.5, and A and B are mutually exclusive, what is P(A or B)?
A) 0.8
B) 0.15
C) 0.2
D) 0.65

Answer A 0.8

4. How many ways can 5 people sit at a round table?
A) 120
B) 24
C) 60
D) 12

Answer: B) 24

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