Ethio Quizzes

10 multiple-choice questions related to chemistry

1,What is the atomic number of carbon?
A) 6 
B) 12 
C) 14 
D) 16 

2,Which of the following is a noble gas?
A) Oxygen 
B) Nitrogen 
C) Argon 
D) Hydrogen 

3,What type of bond involves the sharing of electron pairs between atoms?
A) Ionic bond 
B) Covalent bond 
C) Metallic bond 
D) Hydrogen bond 

4,Which of the following represents a strong acid?
A) HCl 
B) CH₃COOH 
C) NH₃ 
D) H₂CO₃ 

5,What is the pH of a neutral solution at 25°C?
A) 0 
B) 7 
C) 14 
D) 10 

6,Which of the following elements is a transition metal?
A) Sodium 
B) Calcium 
C) Iron 
D) Aluminum 

7,What is the molar mass of water (H₂O)?
A) 16 g/mol 
B) 18 g/mol 
C) 20 g/mol 
D) 22 g/mol 

8,Which of the following reactions is an example of a combustion reaction?
A) H₂ + O₂ → H₂O 
B) C₃H₈ + O₂ → CO₂ + H₂O 
C) Na + Cl₂ → NaCl 
D) CaCO₃ → CaO + CO₂ 

9,What is the primary intermolecular force in hydrogen fluoride (HF)?
A) London dispersion forces 
B) Dipole-dipole interactions 
C) Hydrogen bonding 
D) Ionic bonding 

10, Which of the following compounds is an example of a salt?
A) NaCl 
B) H₂O 
C) CH₄ 
D) C₆H₁₂O₆ 

Answer  comment

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📌 Math Grade 12 

Multiple Choice Questions Collected from Unit 1

1) Which of the following best describes a sequence? 
A) A group of numbers arranged in a specific order 
B) A set of random numbers 
C) Numbers that are not related to each other 
D) A sequence is not a mathematical concept 

Answer: A 
Explanation: A sequence is a list of numbers arranged in a specific order, where each number is related to the others by a defined rule.

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2) What is the common difference in the arithmetic sequence: 3, 7, 11, 15, ...? 
A) 2 
B) 3 
C) 4 
D) 5 

Answer: A 
Explanation: The common difference is found by subtracting any term from the next term (7 - 3 = 4).

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3) In a geometric sequence, if the first term is 2 and the common ratio is 3, what is the second term? 
A) 6 
B) 8 
C) 9 
D) 11 

Answer: A 
Explanation: The second term is found by multiplying the first term by the common ratio (2 × 3 = 6).

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4) What does the sigma notation represent in mathematics? 
A) The sum of a sequence 
B) The product of a sequence 
C) The average of a sequence 
D) The difference of a sequence 

Answer: A 
Explanation: Sigma notation (Σ) is used to denote the sum of a sequence of numbers.

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5) What is the sum of the first 5 terms of the arithmetic sequence: 2, 5, 8, 11, ...? 
A) 30 
B) 33 
C) 35 
D) 40 

Answer: B 
Explanation: The first five terms are 2, 5, 8, 11, and 14. Their sum is 2 + 5 + 8 + 11 + 14 = 40.

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6) Which type of series does not have a finite sum? 
A) Arithmetic series 
B) Geometric series 
C) Infinite series 
D) Convergent series 

Answer: C 
Explanation: Infinite series can continue indefinitely and may not converge to a finite sum.

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7) An arithmetic progression has a first term of 4 and a common difference of 3. What is the 10th term? 
A) 31 
B) 30 
C) 34 
D) 33 

Answer: A 
Explanation: The formula for the nth term is aₙ = a₁ + (n - 1)d. Thus, a₁₀ = 4 + (10 - 1) ⋅ 3 = 31.

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8) In a geometric sequence, if the first term is 5 and the common ratio is 2, what is the fourth term? 
A) 10 
B) 15 
C) 20 
D) 25 

Answer: C 
Explanation: The fourth term can be calculated as a₄ = a₁ ⋅ rⁿ⁻¹ = 5 ⋅ 2³ = 40.

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9) What is the formula to find the nth term of an arithmetic sequence? 
A) aₙ = a₁ + (n - 1)d 
B) aₙ = a₁ × rⁿ⁻¹ 
C) aₙ = a₁ + rd 
D) aₙ = a₁ ÷ rⁿ⁻¹ 

Answer: A 
Explanation: The formula for finding the nth term in an arithmetic sequence is aₙ = a₁ + (n - 1)d.

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10) Which of the following is an example of an arithmetic sequence? 
A) 2, 4, 8, 16, ... 
B) 3, 6, 9, 12, 15 ... 
C) 1, 3, 9, 27, ... 
D) 5, 10, 20, 40, ... 

Answer: B 

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📌 Math Grade 12 

Multiple Choice Questions Collected from Unit 1

1) Which of the following best describes a sequence? 
A) A group of numbers arranged in a specific order 
B) A set of random numbers 
C) Numbers that are not related to each other 
D) A sequence is not a mathematical concept 

Answer: A 
Explanation: A sequence is a list of numbers arranged in a specific order, where each number is related to the others by a defined rule.

---

2) What is the common difference in the arithmetic sequence: 3, 7, 11, 15, ...? 
A) 2 
B) 3 
C) 4 
D) 5 

Answer: A 
Explanation: The common difference is found by subtracting any term from the next term (7 - 3 = 4).

---

3) In a geometric sequence, if the first term is 2 and the common ratio is 3, what is the second term? 
A) 6 
B) 8 
C) 9 
D) 11 

Answer: A 
Explanation: The second term is found by multiplying the first term by the common ratio (2 × 3 = 6).

---

4) What does the sigma notation represent in mathematics? 
A) The sum of a sequence 
B) The product of a sequence 
C) The average of a sequence 
D) The difference of a sequence 

Answer: A 
Explanation: Sigma notation (Σ) is used to denote the sum of a sequence of numbers.

---

5) What is the sum of the first 5 terms of the arithmetic sequence: 2, 5, 8, 11, ...? 
A) 30 
B) 33 
C) 35 
D) 40 

Answer: B 
Explanation: The first five terms are 2, 5, 8, 11, and 14. Their sum is 2 + 5 + 8 + 11 + 14 = 40.

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6) Which type of series does not have a finite sum? 
A) Arithmetic series 
B) Geometric series 
C) Infinite series 
D) Convergent series 

Answer: C 
Explanation: Infinite series can continue indefinitely and may not converge to a finite sum.

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7) An arithmetic progression has a first term of 4 and a common difference of 3. What is the 10th term? 
A) 31 
B) 30 
C) 34 
D) 33 

Answer: A 
Explanation: The formula for the nth term is aₙ = a₁ + (n - 1)d. Thus, a₁₀ = 4 + (10 - 1) ⋅ 3 = 31.

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8) In a geometric sequence, if the first term is 5 and the common ratio is 2, what is the fourth term? 
A) 10 
B) 15 
C) 20 
D) 25 

Answer: C 
Explanation: The fourth term can be calculated as a₄ = a₁ ⋅ rⁿ⁻¹ = 5 ⋅ 2³ = 40.

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9) What is the formula to find the nth term of an arithmetic sequence? 
A) aₙ = a₁ + (n - 1)d 
B) aₙ = a₁ × rⁿ⁻¹ 
C) aₙ = a₁ + rd 
D) aₙ = a₁ ÷ rⁿ⁻¹ 

Answer: A 
Explanation: The formula for finding the nth term in an arithmetic sequence is aₙ = a₁ + (n - 1)d.

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10) Which of the following is an example of an arithmetic sequence? 
A) 2, 4, 8, 16, ... 
B) 3, 6, 9, 12, 15 ... 
C) 1, 3, 9, 27, ... 
D) 5, 10, 20, 40, ... 

Answer: B 

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📚 Questions from EUEE and Grade 10 matric /2000- 2015/

1,What is the largest subatomic particles?

2,Ions are

A. atoms of an element that have different numbers of protons
B. atoms of an element that have different numbers of neutrons
C.atoms that have a charge

2.What particles are found in the nucleus of an atom?

A. protons and neutrons
B.protons and electrons
C.neutrons and electrons

3,Which subatomic particle has the smallest mass?
A.proton
B,neutron
C,electron

4.Which subatomic particle has a charge of zero?
A,proton
B,neutron
C,electron

5,Which subatomic particle has a charge of +1?
A,proton
B,neutron
C,electron

6,Which section of an atom has the highest density?
A,electron cloud
B,nucleus
C,all sections have the same density

7,The atomic number tells the
A,number of electrons in the atom
B,number of protons in the atom
C,number of neutrons in the atom

8,The number of protons and neutrons in a nucleus is the
A,atomic mass
B,atomic number
C,mass number


9,Nucleons are
A,electrons and protons
B,electrons and neutrons
C,protons and neutrons


10,Where are the electrons in an atom located?
A,nucleus
B,atomic orbitals
C,corona of the nucleus

11,. According to Dalton’s Atomic Theory, matter consists of indivisible ___
a) Molecules
b) Atoms
c) Ions
d) Mixtures

12,Atoms of different elements differ in mass.
a) True
b) False

13,What did Dalton’s Theory couldn’t explain?
a) gaseous volumes
b) conservation of mass
c) chemical philosophy
d) indivisible atoms

14,What is the name of Dalton’s publication?
a) A New system of atomic Philosophy
b) An old system of Chemical Philosophy
c) A New System of Chemical Philosophy
d) A New System of Chemical Prophecy

15,Which of the following may not be explained by Dalton’s atomic theory?
a) reason for combining atoms
b) conservation of mass
c) chemical philosophy
d) indivisible atoms

16,Law of conservation of mass isn’t explained in Dalton’s atomic theory.
a) True
b) False

17,All atoms of a given element have identical including identical __
a) Properties, mass
b) Weight, volume
c) Volume, properties
d) Temperature, pressure

Comment your answers

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1. Food prices have been … steadily for at least ten years.
a) rising
b) lifting
c) raising
2. I’ll have to study hard, … I can pass the exam.
a) so that
b) such
c) in order
3. You … to eat if you are not hungry.
a) needn’t
b) haven’t
c) don’t have
4. We’ll dance and … we’ll have lunch.
a) straight away
b) so
c) then
5. She has to go to Germany for the next … of the training.
a) step
b) stage
c) point
6. When the meeting had finished, we went … the plan once again.
a) up
b) down
c) over
7. I locked the animals in the cage to … them from getting away.
a) avoid
b) hinder
c) prevent
8. You’re … your time trying to persuade her.
a) wasting
b) losing
c) missing

Drop your Ans in the comment section 👇

Answer.
1.a 2.a 3.c 4.c 5.b 6.c 7.c 8.a

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