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19 Apr, 15:41

የቱ Subject ይከብዳል?

♾ Math ♾

Physics

History

Economics

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19 Apr, 12:34

Chemistry based on Questions Introduction to Chemistry

1. Which of the following is the best definition of chemistry?
a) The study of life and living organisms
b) The study of matter and its properties, as well as how matter changes
c) The study of the universe and celestial bodies
d) The study of the history of the Earth

2. Which of the following is NOT considered a branch of chemistry?
a) Organic Chemistry
b) Analytical Chemistry
c) Physical Chemistry
d) Philosophical Chemistry

3. What is the primary focus of organic chemistry?
a) The study of carbon-containing compounds
b) The study of inorganic compounds
c) The study of the rate of chemical reactions
d) The study of the composition of substances

4. Analytical chemistry focuses on:
a) The study of chemical reactions in living organisms
b) The identification and quantification of substances
c) The study of the energy changes that accompany chemical reactions
d) The synthesis of new compounds

5. Which branch of chemistry deals with the energy changes associated with chemical reactions?
a) Organic Chemistry
b) Analytical Chemistry
c) Physical Chemistry
d) Biochemistry

6. Biochemistry is primarily concerned with the study of:
a) Chemical reactions in industrial processes
b) Chemical processes within living organisms
c) The structure of matter at the atomic level
d) The properties of non-carbon-based compounds

7. Which of the following is an example of a chemical change?
a) Melting ice
b) Boiling water
c) Burning wood
d) Dissolving sugar in water

8. Which of the following is an example of a physical change?
a) Rusting of iron
b) Burning of gasoline
c) Freezing water
d) Cooking an egg

9. Matter is defined as anything that:
a) Occupies space and has mass
b) Is invisible to the naked eye
c) Can conduct electricity
d) Is made of living cells

10. Which of the following is NOT a state of matter?
a) Solid
b) Liquid
c) Gas
d) Vacuum

11. Which state of matter has a definite volume but no definite shape?
a) Solid
b) Liquid
c) Gas
d) Plasma

12. Which state of matter has both a definite shape and a definite volume?
a) Solid
b) Liquid
c) Gas
d) Plasma

13. The smallest unit of an element that retains the properties of that element is:
a) A molecule
b) A compound
c) An atom
d) An ion

14. A substance made up of two or more elements chemically combined in a fixed ratio is:
a) An element
b) A mixture
c) A compound
d) An alloy

15. Which of the following is an example of an element?
a) Water (H2O)
b) Sodium chloride (NaCl)
c) Gold (Au)
d) Carbon dioxide (CO2)

16. Which of the following is an example of a compound?
a) Oxygen (O2)
b) Nitrogen (N2)
c) Methane (CH4)
d) Helium (He)

17. A combination of two or more substances that are physically combined is called a:
a) Compound
b) Mixture
c) Molecule
d) Solution

18. In a heterogeneous mixture:
a) The composition is uniform throughout.
b) The components are easily distinguishable.
c) The components are chemically bonded.
d) It consists of only one substance.

19. A homogeneous mixture is also called a:
a) Suspension
b) Colloid
c) Solution
d) Emulsion

20. Which of the following is an example of a homogeneous mixture?
a) Sand and water
b) Oil and water
c) Saltwater
d) Gravel and sand

Unit 1: Answers
1. b
2. d
3. a
4. b
5. c
6. b
7. c
8. c
9. a
10. d
11. b
12. a
13. c
14. c
15. c
16. c
17. b
18. b
19. c
20. c

Every aspect of the world today – even politics and international relations – is affected by chemistry." — Linus Pauling (Highlights the relevance of chemistry).

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19 Apr, 07:57

Barrons Digital SAT preview.pdf

4.3Mb

Erica Reading Digital SAT.pdf

66.1Mb

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19 Apr, 07:44

Biology quiz based on introduction to biology and field of biology

1. Biology is the study of:
a) The universe
b) Living organisms
c) Chemical reactions
d) Ancient civilizations

2. Which of the following best describes the scope of biology?
a) The study of animals only
b) The study of plants only
c) The study of the origin, structure, physiology, behavior, and evolution of living organisms
d) The study of non-living things

3. The term "biology" is derived from which two Greek words?
a) Geo and logia
b) Bio and logia
c) Bio and metria
d) Chemo and logia

4. The study of plants is called:
a) Zoology
b) Microbiology
c) Botany
d) Ecology

5. Which branch of biology deals with the study of animals?
a) Botany
b) Zoology
c) Microbiology
d) Anatomy

6. The study of microscopic organisms, such as bacteria and viruses, is called:
a) Mycology
b) Virology
c) Microbiology
d) Cytology

7. Which branch of biology focuses on the structure of living organisms and their parts?
a) Physiology
b) Ecology
c) Anatomy
d) Genetics

8. The study of the functions and processes of living organisms and their parts is known as:
a) Anatomy
b) Physiology
c) Genetics
d) Ecology

9. Which branch of biology deals with the study of heredity and variation in living organisms?
a) Ecology
b) Evolution
c) Genetics
d) Taxonomy

10. The branch of biology that studies the interactions between organisms and their environment is called:
a) Anatomy
b) Physiology
c) Ecology
d) Genetics

11. The study of the evolutionary history and relationships among organisms is known as:
a) Taxonomy
b) Evolution
c) Genetics
d) Embryology

12. Which branch of biology is concerned with the classification and naming of organisms?
a) Evolution
b) Ecology
c) Taxonomy
d) Embryology

13. The study of the development of an organism from a fertilized egg to its adult form is called:
a) Genetics
b) Physiology
c) Anatomy
d) Embryology

14. Which branch of biology studies the structure and function of cells?
a) Histology
b) Cytology
c) Embryology
d) Mycology

15. The study of tissues is called:
a) Cytology
b) Histology
c) Embryology
d) Anatomy

16. Which branch of biology studies fungi?
a) Microbiology
b) Zoology
c) Mycology
d) Botany

17. The study of viruses is called:
a) Bacteriology
b) Virology
c) Mycology
d) Cytology

18. Which branch of biology is concerned with the study of behavior of animals in their natural environment?
a) Ecology
b) Ethology
c) Physiology
d) Anatomy

19. Which branch of biology would be most involved in studying the causes and effects of a new disease outbreak?
a) Botany
b) Zoology
c) Microbiology
d) Pathology

20. Which branch of biology would be most concerned with developing a new drug to treat a disease?
a) Anatomy
b) Physiology
c) Pharmacology
d) Ecology

Answers:

1. b) Living organisms
2. c) The study of the origin, structure, physiology, behavior, and evolution of living organisms
3. b) Bio and logia
4. c) Botany
5. b) Zoology
6. c) Microbiology
7. c) Anatomy
8. b) Physiology
9. c) Genetics
10. c) Ecology
11. b) Evolution
12. c) Taxonomy
13. d) Embryology
14. b) Cytology
15. b) Histology
16. c) Mycology
17. b) Virology
18. b) Ethology
19. d) Pathology
20. c) Pharmacology

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ˡᶦᵏᵉ ˢᵃᵛᵉ ˢʰᵃʳᵉ ᶜᵒᵐᵐᵉⁿᵗ

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18 Apr, 22:28

Natural or Social ናቹ?

😇 Social 😇

😢 Natural 😢

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18 Apr, 21:11

Forward from: G 9-12 students

" የ12ኛ ክፍል ፈተና ከአንድ ወር / ከአንድ ወር ተኩል በኃላ ለመስጠት ዝግጅት እየተደረገ ነው " - ብርሃኑ ነጋ (ፕሮፌሰር)

የትምህርት ሚኒስትሩ ብርሃኑ ነጋ (ፕሮፌሰር) የዘንድሮው የ12ኛ ክፍል ብሔራዊ ፈተና ከአንድ ወር / ከአንድ ወር ተኩል በኃላ እንደሚሰጥ ጠቁመዋል።

ሚኒስትሩ ፥ " ይሄ አራተኛው ነው በአዲሱ የፈተና አሰጣጥ ፈተና የሚሰጥበት " ብለዋል።

ትምህርት ሚኒስቴር ባለፉት ዓመታት የ12ኛ ክፍል ብሔራዊ ፈተና ከትምህርት ቤቶች ወጥቶ ተማሪዎችን ዩኒቨርሲቲዎች ውስጥ አስገብቶ ፈተና እንዲሰጥ እያደረገ መሆኑ ይታወቃል።

የትምህርት ሚኒስትሩ ስለዘንድሮው የ2017 ዓ/ም ፈተና በተናገሩበት ወቅት 150 ሺህ ተማሪዎች ፈተናቸውን በኦንላይ እንዲወስዱ ዝግጅት እየተደረገ መሆኑን ገልጸዋል።

ብርሃኑ (ፕሮፌሰር) ፥ " እንደ ከዚህ ቀደሙ አድካሚ በሆነ ከቦታ ቦታ ልጆችን እያዘዋወሩ ከመሄድ ባለፈው ዓመት 29 ሺህ ተማሪ ነበር ኦንላይን ፈተና የሰጠነው ዘንድሮ ደግሞ 150 ሺህ ተማሪ ኦንላይን ፈተና ለመስጠት እየተዘጋጀን ነው " ብለዋል።

ሚኒስትሩ የ12ኛ ክፍል ብሔራዊ ፈተና የሚሰጥበትን ቀን ቆርጠው ባይናገሩም ፈተናው ከአንድ ወር / ከአንድ ወር ተኩል በኃላ እንዲሰጥ ዝግጅት እየተደረገ መሆኑን ጠቁመዋል።

ቲክቫህ ኢትዮጵያ
#TikvahEthiopiaFamilyAA
@Students9a12
@tikvahethiopia

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18 Apr, 19:57

ተፈታኝ ናቹ? 🤩

🥳 አዎ 🥳

😎 አይ 😎

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18 Apr, 09:43

Education is the most powerful weapon which you can use to change the world." - Nelson Mandela

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Welcome to our channel “Education for all ” Ever one who seek educational ➩Notes ➩Worksheet ➩Exam,Books and quiz @timeforedcation_bot Owner @Johnson12748

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18 Apr, 09:41

10. How is the real coefficient of cubic expansion determined? Question: The real coefficient of cubic expansion (γ_real) of a liquid is:

Poll

A) The observed expansion of the liquid in a container
B) The actual expansion of the liquid, independent of the container
C) The expansion of the container material
D) The difference between apparent and container expansion

5 votes

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18 Apr, 09:41

9. What is a practical application of thermal expansion in solids? Question: An example of thermal expansion in solids is:

Poll

A) The use of expansion joints in bridges
B) The cooling of liquids in refrigerators
C) The compression of gases in turbines
D) The insulation

4 votes

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18 Apr, 09:41

8. Why do gases expand more than solids? Question: Gases exhibit greater thermal expansion than solids because:

Poll

A) They have a lower density
B) Their particles are less tightly bound
C) They have a smaller specific heat capacity
D) They do not follow thermal expansion laws

4 votes

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18 Apr, 09:41

7. What is the apparent coefficient of cubic expansion? Question: The apparent coefficient of cubic expansion (γ_app) of a liquid is:

Poll

A) The expansion of the liquid minus the expansion of the container
B) The expansion of the container only
C) The expansion of the liquid only
D) The sum of the liquid and container expansions

5 votes

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18 Apr, 09:41

6. How is the coefficient of volume expansion related to linear expansion? Question: For a solid, the coefficient of volume expansion (γ) is approximately:

Poll