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Ethio exreme book

24 Apr, 17:10

የ ስንተኛ ክፍል ተማሪ ናችሁ?

5ኛ - 8ኛ

9ኛ - 12ኛ

ዩኒቨርሲቲ

ሌላ 😔

96 0 0 11

Translation and rotation are two fundamental transformations in geometry that can be applied to shapes or objects in a plane or space.

▎Translation

Definition: Translation involves moving every point of a shape or object a certain distance in a specified direction without changing its orientation or size.

Key Features:

• Direction and Distance: Each point of the object moves the same distance in the same direction.

• Preservation of Shape: The shape, size, and orientation remain unchanged.

• Vector Representation: Translations can be represented using vectors. For example, translating a point (x, y) by a vector (a, b) results in the new point (x + a, y + b) .

▎Rotation

Definition: Rotation involves turning a shape or object around a fixed point, known as the center of rotation, by a certain angle.

Key Features:

• Center of Rotation: The point around which the object rotates can be inside or outside the object.

• Angle of Rotation: The amount of turning is specified by an angle (measured in degrees or radians).

• Preservation of Shape: Like translation, rotation preserves the shape and size of the object. However, the orientation changes.

• Mathematical Representation: For a point (x, y) rotated around the origin by an angle θ , the new coordinates can be calculated using:

x' = x cos(θ) - y sin(θ)

y' = x sin(θ) + y cos(θ)

▎Summary

• Translation moves objects without altering their shape or orientation.

• Rotation changes the orientation of objects while keeping their shape and size intact.

Both transformations are essential in various fields such as computer graphics, robotics, and physics, allowing for the manipulation and analysis of geometric figures.

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Ethio exreme book

23 Apr, 18:20

📚 Properties of periodic table

ምን መሠላችሁ ዘመናዊው periodic table በውስጡ በጣም ብዙ እንቆቅልሾች ያሉት ሲሆን እያንዳንዱ የ elements አሰላለፍ እና አቀማመጥ ልዩ ትርጉም ያላቸው ናቸው ። ከእነዚህ ሚስጥሮች ውስጥ የተወሰኑትን እናያለን እነርሱም ። atomic size, metallic character, ionization energy, electro negativity and electron affinity ናቸው ። ፈተና በደንብ ይወጣባቸዋል ።

🪴The nuclear charge is the total charge in the nucleus of all the protons. Increase both down a group and across a period .

Nuclear charge የ proton መጠን ማለት ሲሆን በሁሉም አቅጣጫ እየጨመረ ይሄዳል

🪴Atomic Size (Atomic Radii)

🤜Exact size of an isolated atom cannot be measured because the electron cloud surrounding the atom does not have a sharp boundary. However, an estimate of the atomic size can be made by measuring the distance between the nuclei of two adjacent atoms. This property is called the atomic radius.

📚ትክክለኛውን የ አቶሞች ርቀት ማወቅ እጅግ ከባድ ነው ። ነገር ግን ተቀራራቢ የሆነውን ዋጋ ለማስቀመጥ እንገደዳለን ።

⛑Atomic radius generally increases in a group from top to bottom but it decreases in a period from left to right.

Atomic size ከላይ ወደ ታች በተመሳሳይ group ስንሄድ እየጨመረ ይሄዳል ። በተቃራኒው ከግራ ወደ ቀኝ across a period ስንሄድ ደግሞ ይቀንሳል ።

🪴Ionization Energy (IE)

The ionization energy (IE) is the energy (in kJ) required for the complete removal of 1 mol of electrons from 1 mol of gaseous atoms or ions to form a positive ion .

😁ionization energy ማለት አቶሞች በ reaction ጊዜ electron ያስወግዳሉ ። በዚህ ጊዜ የሚያወጡት energy አለ ። ይሄም ionization energy በመባል ይታወቃል ።

🪴Electron Affinity (EA)
The electron affinity is the energy change for the process of adding an electron to a neutral atom in the gaseous state to form a negative ion:

Electron affinity ማለት ደግሞ ማለት አቶሞች በ reaction ጊዜ electron ይቀበላሉ ። በዚህ ጊዜ የሚያወጡት energy አለ ። ይሄም electron affinity በመባል ይታወቃል ።

ምሳሌ Na + Cl ----->NaCl ብንመለከት

Na------->Na+ ሲቀየር electron loss አድርጓል ይሄም ionization energy ይባላል ።
Cl------------>Cl- ሲቀየር electron gain (add) አድርጓል ይሄም electron affinity ይባላል ።

🍎electron affinity እና ionization energy down the group decrease , across period ደግሞ increase ነው ቢባልም exception ይኖረናል ። እነርሱም

Factors Affecting Ionization Energy

🚩The influence of the electrons’ arrangement. If an atom’s orbitals are exactly half filled or completely filled, the arrangement is more stable than expected;

The first ionization energy of boron is less than that of beryllium and the first ionization energy of oxygen is less than that of nitrogen. The reason for the discrepancy is due to the electron configuration of these elements and Hund's rule

BO₂>N₂>Cl₂ ከእነዚህም ውስጥ FON የሚባሉት ከ H₂ ጋር reaction ከፈጠሩ hydrogen bond ይሰራሉ ።

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Ethio exreme book

20 Apr, 07:06

Mat. 28
¯¯¯¯¯¯¯¯¯¯
⁵........., "Isin Yesusin isa fannifamee ture akka barbaaddan anuu beeka. Hin sodaatinaa!
⁶ Inni as hin jiru, akkuma jedhe ka'eera; kottaa iddoo reeffi isaa ka'ame ture iyyuu ilaalaa!

✞✞Baga guyyaa yaadannoo gooftaa keenyaa yesuus kiristoosii bara 2027 nagaan geessaan.✞✞

            ✞✞Ayyaana gaarii✞✞❤
                              ✞✞✞
                            ✞✞✞
                              ✞✞✞
              ✞✞✞✞✞✞✞✞✞✞✞✞✞
              ✞✞✞✞✞✞✞✞✞✞✞✞✞
                              ✞✞✞
                            ✞✞✞
                              ✞✞✞
                              ✞✞✞
                              ✞✞✞
                            ✞✞✞
✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞✞

458 0 0 3 17

Ethio exreme book

16 Apr, 15:48

Try this test and comment ur answer.

688 0 0 15

Ethio exreme book

16 Apr, 07:15

Family mee altokko vote godhaa warreen nu faana jirtan qofti. Namoota nu hordofan barree qormaataaf qopheessinaatii.

Опрос

Isin faana jirra jabaadhaa👍
Lakki dhiisaa isin hin hordofnu💔

6 голосов

646 0 0 17

Ethio exreme book

15 Apr, 07:44

Репост из: ABDII OROMOO

Multiple Choice Geography Questions

1. Which of the following is an example of an internal force?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

2. Which of the following is an example of an external force?
(a) Earthquakes
(b) Volcanic eruptions
(c) Glaciers
(d) Rivers

3. Which of the following is the primary force responsible for the formation of mountains?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

4. Which of the following is the primary force responsible for the formation of valleys?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

5. Which of the following is the primary force responsible for the formation of sand dunes?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

6. Which of the following is the primary force responsible for the formation of coral reefs?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

7. Which of the following is the primary force responsible for the formation of sinkholes?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

8. Which of the following is the primary force responsible for the formation of waterfalls?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

9. Which of the following is the primary force responsible for the formation of glaciers?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

10. Which of the following is the primary force responsible for the formation of volcanoes?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

11. Which of the following is the primary force responsible for the formation of earthquakes?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

12. Which of the following is the primary force responsible for the formation of canyons?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

13. Which of the following is the primary force responsible for the formation of deltas?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

14. Which of the following is the primary force responsible for the formation of fjords?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

15. Which of the following is the primary force responsible for the formation of atolls?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

16. Which of the following is the primary force responsible for the formation of sea caves?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

17. Which of the following is the primary force responsible for the formation of stalactites and stalagmites?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

18. Which of the following is the primary force responsible for the formation of sandbars?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

19. Which of the following is the primary force responsible for the formation of mesas and buttes?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

20. Which of the following is the primary force responsible for the formation of arches and natural bridges?
(a) Erosion
(b) Plate tectonics
(c) Weathering
(d) Mass wasting

Answer Key:

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

SABA GUDDAA WAAN TAANEEF MIIDIYAA GUDDAATU NUUF MALA!

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609 0 0 14

Ethio exreme book

11 Apr, 23:23

Grade 9 Biology (25 Questions)

1. What is the basic unit of life?
A) Atom
B) Molecule
C) Cell
D) Organ

Answer: C

2. Which organelle is known as the powerhouse of the cell?
A) Nucleus
B) Ribosome
C) Mitochondria
D) Endoplasmic reticulum

Answer: C

3. Which of the following is not a characteristic of living things?
A) Reproduction
B) Growth
C) Movement
D) Rusting

Answer: D

4. What pigment is responsible for photosynthesis?
A) Hemoglobin
B) Chlorophyll
C) Melanin
D) Carotene

Answer: B

5. In which kingdom do we classify mushrooms?
A) Plantae
B) Fungi
C) Protista
D) Animalia

Answer: B

6. Which gas is used during photosynthesis?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Hydrogen

Answer: C

7. The process of converting glucose to energy in cells is called:
A) Respiration
B) Photosynthesis
C) Digestion
D) Transpiration

Answer: A

8. Which cell structure controls what enters and leaves the cell?
A) Nucleus
B) Cell wall
C) Cytoplasm
D) Cell membrane

Answer: D

9. Which of the following is a vertebrate?
A) Earthworm
B) Spider
C) Frog
D) Snail

Answer: C

10. Which organ system transports nutrients in the body?
A) Digestive
B) Respiratory
C) Circulatory
D) Nervous

Answer: C

11. How many chromosomes do human body cells have?
A) 23
B) 46
C) 22
D) 44

Answer: B

12. Which part of the plant absorbs water and minerals?
A) Leaf
B) Stem
C) Root
D) Flower

Answer: C

13. Which is not a function of the skeleton?
A) Protection
B) Movement
C) Digestion
D) Support

Answer: C

14. Which nutrient is mainly used for energy?
A) Protein
B) Carbohydrate
C) Vitamin
D) Mineral

Answer: B

15. Which part of the brain controls balance?
A) Cerebrum
B) Cerebellum
C) Medulla
D) Hypothalamus

Answer: B

16. What is the function of red blood cells?
A) Fight disease
B) Clot blood
C) Carry oxygen
D) Digest fat

Answer: C

17. The smallest bones in the human body are in the:
A) Ear
B) Toe
C) Nose
D) Finger

Answer: A

18. Which kingdom includes bacteria?
A) Fungi
B) Protista
C) Monera
D) Plantae

Answer: C

19. Which organ filters blood in the human body?
A) Liver
B) Kidney
C) Heart
D) Lung

Answer: B

20. Which of the following reproduces by spores?
A) Human
B) Mushroom
C) Cow
D) Fish

Answer: B

21. Which blood cells help fight infections?
A) Red blood cells
B) Platelets
C) White blood cells
D) Plasma

Answer: C

22. The green pigment in plants is:
A) Melanin
B) Hemoglobin
C) Chlorophyll
D) Keratin

Answer: C

23. Which sense organ detects light?
A) Ear
B) Eye
C) Skin
D) Nose

Answer: B

24. How many lungs do humans have?
A) 1
B) 2
C) 3
D) 4

Answer: B

25. Which organ system helps remove waste from the body?
A) Digestive
B) Nervous
C) Excretory
D) Respiratory

Answer: c

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Ethio exreme book

10 Apr, 04:20

▎Area and Perimeter Multiple Choice Questions

1. What is the area of a rectangle with a length of 10 cm and a width of 5 cm?
a) 15 cm²
b) 50 cm²
c) 25 cm²
d) 30 cm²

2. What is the perimeter of a square with a side length of 4 m?
a) 12 m
b) 16 m
c) 20 m
d) 8 m

3. A triangle has a base of 6 cm and a height of 8 cm. What is its area?
a) 24 cm²
b) 36 cm²
c) 48 cm²
d) 12 cm²

4. What is the perimeter of a rectangle with a length of 12 m and a width of 7 m?
a) 38 m
b) 24 m
c) 19 m
d) 42 m

5. What is the area of a circle with a radius of 3 cm? (Use π ≈ 3.14)
a) 9.42 cm²
b) 28.26 cm²
c) 6.28 cm²
d) 12.56 cm²

6. A parallelogram has a base of 10 cm and a height of 5 cm. What is its area?
a) 50 cm²
b) 25 cm²
c) 30 cm²
d) 15 cm²

7. What is the perimeter of a triangle with sides measuring 5 cm, 12 cm, and 13 cm?
a) 30 cm
b) 25 cm
c) 20 cm
d) 18 cm

8. What is the area of a trapezoid with bases of lengths 8 cm and 5 cm, and a height of 4 cm?
a) 26 cm²
b) 20 cm²
c) 30 cm²
d) 32 cm²

9. What is the perimeter of a regular hexagon with each side measuring 3 m?
a) 12 m
b) 15 m
c) 18 m
d) 21 m

10. What is the area of a rectangle with dimensions of length = 15 m and width = 10 m?
a) 150 m²
b) 100 m²
c) 125 m²
d) 175 m²

11. If the radius of a circle is doubled, how does the area change?
a) It remains the same
b) It doubles
c) It triples
d) It quadruples

12. What is the perimeter of a rectangle if its length is twice its width, and the width is 4 m?
a) 16 m
b) 24 m
c) 20 m
d) 12 m

13. The area of a square is 64 cm². What is the length of one side?
a) 6 cm
b) 8 cm
c) 10 cm
d) 12 cm

14. A circular garden has a diameter of 10 m. What is its circumference? (Use π ≈ 3.14)
a) 31.4 m
b) 15.7 m
c) 25.0 m
d) 20.0 m
15.What is the area of a rhombus with diagonals measuring 10 cm and 6 cm?
a) 30 cm²
b) 60 cm²
c) 40 cm²
d) 20 cm²

Answers and Explanations:

1. b) Area = Length × Width = 10 × 5 = 50 cm²

2. b) Perimeter = 4 × side length = 4 × 4 = 16 m

3. a) Area = ½ × base × height = ½ × 6 × 8 = 24 cm²

4. a) Perimeter = 2(Length + Width) = 2(12 + 7) = 38 m

5. b) Area = πr² = π(3²) = π(9) ≈ 28.26 cm²

6. a) Area = Base × Height = 10 × 5 = 50 cm²

7. a) Perimeter = Sum of all sides = 5 + 12 + 13 = 30 cm

8. a) Area = ½(Base₁ + Base₂)×Height = ½(8 + 5)×4 = 13/2×4 = 26 cm²

9. c) Perimeter = 6 × side length = 6 × 3 = 18 m

10. a) Area = Length × Width = 15 × 10 =150 m²

11. d) Area changes as A = πr². If radius doubles, area becomes π(2r)²=4πr², so it quadruples.

12. b) Length = 2 × Width =2×4=8 m; Perimeter = 2(Length + Width)=2(8 +4)=24 m

13. b) Side length = √(Area)=√(64)=8 cm

14. a) Circumference = π ×
Diameter = 3.14 ×10=31.4 m

15. a) Area = ½ × d₁ × d₂ = ½ × 10 × 6 = 30 cm²

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Ethio exreme book

7 Apr, 07:29

Репост из: DABOO ACADAMY

Grade 10 Biology questions.

1. Which of the following is the primary pigment responsible for photosynthesis in plants?
   a) Chlorophyll
   b) Carotenoids
   c) Anthocyanins
   d) Xanthophylls

2. What is the function of plant stomata?
   a) Absorption of water and nutrients
   b) Gas exchange
   c) Photosynthesis
   d) Reproduction

3. Which of the following plant groups does not produce seeds?
   a) Angiosperms
   b) Gymnosperms
   c) Ferns
   d) Bryophytes

4. What is the reproductive structure of angiosperms?
   a) Cone
   b) Flower
   c) Sporophyte
   d) Sorus

5. What is the primary function of plant leaves?
   a) Gas exchange
   b) Photosynthesis
   c) Water absorption
   d) Reproduction

6. What is the purpose of plant cuticle?
   a) Protection from herbivores
   b) Gas exchange
   c) Water retention
   d) Nutrient absorption

7. Which of the following is not a characteristic of monocot plants?
    a) Parallel leaf veins
    b) Netted leaf venation
    c) Floral parts in multiples of three
    d) Fibrous root system

8. What is the main function of xylem tissue in plants?
    a) Transport of water and minerals
    b) Photosynthesis
    c) Support and structure
    d) Nutrient absorption

9. Which plant group includes mosses and liverworts?
    a) Bryophytes
    b) Gymnosperms
    c) Angiosperms
    d) Pteridophytes

10. What is the name of the male reproductive organ in a flower?
    a) Pistil
    b) Stamen
    c) Petal
    d) Sepal

11. Which of the following is an example of a gymnosperm?
    a) Oak tree
    b) Pine tree
    c) Apple tree
    d) Maple tree

12. Which plant group includes flowering plants?
    a) Bryophytes
    b) Gymnosperms
    c) Angiosperms
    d) Pteridophytes

13. What is the primary function of plant stems?
    a) Photosynthesis
    b) Water absorption
    c) Support and transport
    d) Nutrient storage

14. Which of the following is not a type of plant tissue?
    a) Epidermal tissue
    b) Ground tissue
    c) Vascular tissue
    d) Sensory tissue

15. Which plant group includes conifers and cycads?
    a) Bryophytes
    b) Gymnosperms
    c) Angiosperms
    d) Pteridophytes

16. What is the process by which water moves through a plant from roots to leaves?
    a) Transpiration
    b) Photosynthesis
    c) Osmosis
    d) Capillary action
17. Which of the following is an example of a dicot plant?
    a) Wheat
    b) Corn
    c) Tomato
    d) Sugarcane

18. What is the term for the transfer of pollen from the male reproductive organ to the female reproductive organ of a flower?
    a) Pollination
    b) Fertilization
    c) Germination
    d) Embryogenesis

19. Which of the following is not a function of plant hormones?
    a) Regulating growth and development
    b) Responding to environmental stimuli
    c) Transporting nutrients
    d) Coordinating responses to stress

20. What is the function of the root cap in plants?
    a) Protection
    b) Nutrient absorption
    c) Gas exchange
    d) Reproduction

21. Which of the following is an example of a taproot system?
    a) Grass
    b) Carrot
    c) Lily
    d) Bamboo

22. What is the name of the process by which plants release oxygen and absorb carbon dioxide?
    a) Photosynthesis
    b) Respiration
    c) Transpiration
    d) Germination

📌 Answers

1. a) Chlorophyll
2. b) Gas exchange
3. c) Ferns
4. b) Flower
5. b) Photosynthesis
6. c) Water retention
7. b) Netted leaf venation
8. a) Transport of water and minerals
9. a) Bryophytes
10. b) Stamen
11. b) Pine tree
12. c) Angiosperms
13. c) Support and transport
14. d) Sensory tissue
15. b) Gymnosperms
16. a) Transpiration
17. c) Tomato
18. a) Pollination
19. c) Transporting nutrients
20. a) Protection
21. b) Carrot
22. a) Photosynthesis

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876 0 0 2 17

Ethio exreme book

6 Apr, 14:49

👉from grade 12 natural entrance tricks private school

Specific Heat and Latent Heat

🦋Specific Heats:Heat flowing into or out of a body (or system) changes the temperature of the body (or system)
except during phase changes the temperature remains constant.
The quantity of heat, Q, required
to change the temperature of a body of mass m by is proportional to both the mass and the change in temperature. Mathematically,

Q=m^T =mc^T

^ = changed ለማለት ነው።😜

c is a proportionality constant called specific heat capacity(or in short specific heat) of the substance defined as the amount of heat required to raise the temperature of a unit mass of any substance through a unit degree.

🦋The heat capacity(C) is defined as the amount of heat energy required to raise the temperature of a substance by 10C.

ከዚህ የምትይዙልኝ ነገር

ትንሿ c   Q= mc^T
ትልቋ C   Q =C^T

ስለዚህ C=mc    ይሆናል ማለት ነው።

🦋Latent Heats
Latent Heat the heat required per unit mass of a substance to produce a phase change at constant temperature. The latent heat, required to change the phase of ―m‖ mass of a body at constant temperature is calculated as,

Q=mL

በተረፈ ፎቶዎቹን ተመልከቱ

Types of Latent Heat Transfer

There are two types of latent heat transfers between an object and its environment.

🦋Latent Heat of Fusion (Lf): is the heat absorbed or released when matter melts, changing phase
from solid to liquid form at constant temperature. For example, 333.7 kJ of heat is required to change 1 kg of ice to water at 0°C, so for water Lf= 333.7kJ/kg.

🦋Latent Heat of Vaporization (LV): is the heat absorbed or released when matter vaporizes, changing phase from liquid to gas phase at constant temperature. To change 1 kg of water to steam at 100°C, 2256 kJ of heat is required and so LV = 2256 kJ.

ይሄን ሁሉ ያነሳነው በምክንያት ነው በባለፈው አመት አንድ ጥያቄ መጥቶ ነበር ። ከዘጠነኛ ክፍል መፅሐፍ ላይ ያለው ሀሳቡ ብቻ ነው ። ጥያቄውን የወሰዱት ከ freshman module ላይ ነው። አስተውሉ ከዚህ ቦታ ላይ ሊወጡ የሚችሉ የ calculations ጥያቄዎች ሁለት አይነት ናቸው ። እነርሱም

🚩Example 1:
How much heat energy is required to change a 40 g ice cube from a solid at -10 °C to steam at 110 °C?

ቀላል ይመስላል ግን በጣም ውስብስብ ነው ። ሀሳቡን ልንገራችሁ
🖌 አርባ ግራም በረዶን ከ -10°C ወደ 110°C ለመቀየር ምን ያክል heat ያስፈልጋል ። የአምና ጥያቄ ነው ። አሰራሩን ከፎቶው ተመልከቱት ።

🚩Example 2:
If 90 g of molten lead at 327.3 °C is poured into a 300 g casting form made of iron and initially at 20°C, what is the final temperature of the system? Assume no energy is lost to the environment.

🖌90 g የቀለጠ እርሳስ ✏️ 327.3 °C ቢኖረን እና ይሄን እርሳስ 20°C ላይ ከሚገኝ 300 g ብረት ብንጨምረው እና equilibrium ላይ ሲደርሱ የሚኖራቸው final temperature ምን ያክል ይሆናል ። የዚህም አሰራር ከፎቶው አለላችው ።

826 0 0 15

Ethio exreme book

6 Apr, 13:33

▎Multiple-Choice Questions

1. What is the primary pigment involved in photosynthesis?

• A) Carotene

• B) Chlorophyll

• C) Xanthophyll

• D) Anthocyanin

2. Where in the plant does photosynthesis primarily take place?

• A) Roots

• B) Stems

• C) Leaves

• D) Flowers

3. Which of the following is a product of photosynthesis?

• A) Oxygen

• B) Carbon dioxide

• C) Glucose

• D) Both A and C

4. What are the raw materials for photosynthesis?

• A) Water and oxygen

• B) Carbon dioxide and glucose

• C) Water and carbon dioxide

• D) Glucose and oxygen

5. In which part of the chloroplast do the light-dependent reactions occur?

• A) Stroma

• B) Thylakoid membranes

• C) Cytoplasm

• D) Matrix

6. What is the main purpose of the Calvin cycle?

• A) To produce ATP

• B) To fix carbon dioxide into glucose

• C) To absorb light energy

• D) To release oxygen

7. Which gas is released as a byproduct of photosynthesis?

• A) Nitrogen

• B) Oxygen

• C) Methane

• D) Carbon dioxide

8. What is photoinhibition?

• A) Enhanced photosynthesis due to high light intensity

• B) Damage to the photosynthetic apparatus caused by excessive light

• C) Increased carbon fixation in low light conditions

• D) The ability of plants to adapt to low light

9. Which type of plant uses the C4 pathway for photosynthesis?

• A) Wheat

• B) Rice

• C) Sugarcane

• D) Barley

10. How does temperature affect the rate of photosynthesis?

• A) It has no effect.

• B) It increases indefinitely with temperature.

• C) It increases to an optimal point and then decreases.

• D) It only affects light-dependent reactions.

11. Which of the following factors does NOT affect the rate of photosynthesis?

• A) Light intensity

• B) Water availability

• C) Soil pH

• D) Carbon dioxide concentration

12. What is the role of NADPH in photosynthesis?

• A) To transport oxygen

• B) To store energy for use in the Calvin cycle

• C) To absorb light energy

• D) To release carbon dioxide

13. What is the significance of photosynthesis in ecosystems?

• A) It produces food for herbivores.

• B) It generates oxygen for aerobic organisms.

• C) It helps regulate atmospheric carbon dioxide.

• D) All of the above.

14. Which of the following statements about CAM plants is true?

• A) They perform photosynthesis only at night.

• B) They fix carbon dioxide during the day.

• C) They are adapted to wet environments.

• D) They do not require sunlight for photosynthesis.

15. What is the effect of deforestation on global photosynthesis rates?

• A) It increases photosynthesis rates.

• B) It has no effect on global rates.

• C) It decreases photosynthesis rates.

• D) It only affects local rates.

---

▎Answers

1. B) Chlorophyll

2. C) Leaves

3. D) Both A and C

4. C) Water and carbon dioxide

5. B) Thylakoid membranes

6. B) To fix carbon dioxide into glucose

7. B) Oxygen

8. B) Damage to the photosynthetic apparatus caused by excessive light

9. C) Sugarcane

10. C) It increases to an optimal point and then decreases.

11. C) Soil pH

12. B) To store energy for use in the Calvin cycle

13. D) All of the above.

14. A) They perform photosynthesis only at night.

15. C) It decreases photosynthesis rates.

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668 0 0 16

Ethio exreme book

6 Apr, 01:06

Try this

593 0 0 4

Ethio exreme book

5 Apr, 10:06

Репост из: ABDII OROMOO

Common English Expressions:

1. Fed up - to have had enough

2. Feel like - want to do something

3. No hard feelings - don't worry

4. Heavy duty - tough and powerful

5. Hook up - to connect

6. Join forces - to unite

7. Just what the doctor ordered - exactly what you need

8. Just about - nearly

9. Ins and outs - small details

10. In hand - under control

11. Kick around - treat badly

12. Kick the bucket - to die

13. Knock it off - stop it

14. Know-it-all - someone overconfident

15. Keep on - continue

16. In less than no time - immediately

17. Long face - looking sad

18. Means business - serious

19. Make up your mind - decide

20. Make off with - to steal

21. Make believe - to pretend

22. Mixed up - confused

23. Makes sense - seems reasonable/right

24. Make a difference - to matter

25. Nail it down - finalize it

26. Never mind - don't worry about it

27. No doubt - certainly

28. No sweat - it's easy/OK

29. Of age - old enough

30. Off the hook - out of trouble

31. Once in a blue moon - rarely

32. Out of order - does not work

33. Out of shape - unfit

SABA GUDDAA WAAN TAANEEF MIIDIYAA GUDDAATU NUUF MALA!

📡 MIIDIYAA @ABDII_OROMOO 📡

730 0 3 13

Ethio exreme book

4 Apr, 21:46

📌 Chemistry common questions for entrance exam on States of Matter with Answers

1. Which state of matter has a definite volume and shape?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (a) Solid

2. Which state of matter has particles that are closely packed and arranged in a regular pattern?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (a) Solid

3. Which state of matter has particles that are closely packed but not arranged in a regular pattern?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (b) Liquid

4. Which state of matter has particles that are widely spaced and move freely?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (c) Gas

5. Which state of matter has particles that are ionized and move freely?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (d) Plasma

6. The process of a gas changing directly into a solid is called:
   A. Sublimation
   B. Condensation
   C. Deposition
   D. Evaporation
Answer: C. Deposition

7. Which state of matter has the highest density?
(a) Solid
(b) Liquid
(c) Gasi
(d) Plasma
Answer: (a) Solid

8. The process of a liquid changing into a gas is called:
   A. Freezing
   B. Melting
   C. Boiling
   D. Sublimation
Answer: C. Boiling

9. Which of the following is an example of a gas turning into a liquid?
   A. Melting
   B. Freezing
   C. Condensation
   D. Sublimation
Answer: C. Condensation

10. Which state of matter is the most compressible?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
Answer: (c) Gas

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854 0 2 12

Ethio exreme book

3 Apr, 19:20

FOR ONLY ONE WHO LIKE THIS CHANNEL. DO YOU LIKE THIS CHANNEL.

Опрос

Yes be strong.👍
No i don't.👏
Continue❤

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796 0 0 17

Ethio exreme book

3 Apr, 14:43

PHYSICS QUIZ ON ELASTIC PROPERTIES OF MATTER MOST COMMON PART OF EUU

▎Questions

1. What is Hooke's Law?
A) F = ma
B) F = kx
C) F = mg
D) F = mv²/r

2. In the context of elasticity, what does the term 'stress' refer to?
A) The amount of deformation
B) The force applied per unit area
C) The energy stored in an object
D) The temperature change

3. What is the unit of Young's modulus?
A) Pascal (Pa)
B) Joule (J)
C) Newton (N)
D) Meter (m)

4. Which of the following materials exhibits elastic behavior?
A) Rubber
B) Glass
C) Steel
D) All of the above

5. If a spring has a spring constant of 200 N/m and is compressed by 0.1 m, what is the force exerted by the spring?
A) 20 N
B) 50 N
C) 100 N
D) 200 N

6. What is the relationship between stress and strain in a material that obeys Hooke's Law?
A) Stress is inversely proportional to strain
B) Stress is directly proportional to strain
C) Stress is equal to strain squared
D) There is no relationship

7. Which of the following quantities is a measure of a material's ability to deform under tensile stress?
A) Bulk modulus
B) Shear modulus
C) Young's modulus
D) Poisson's ratio

8. What happens to the length of a material when it is subjected to tensile stress?
A) It decreases
B) It remains unchanged
C) It increases
D) It oscillates

9. If a material has a Poisson's ratio of 0.3, what does this imply about its lateral contraction when stretched?
A) No lateral contraction occurs
B) Lateral contraction is equal to the longitudinal extension
C) Lateral contraction is less than the longitudinal extension
D) Lateral contraction is greater than the longitudinal extension

10. Which law describes the relationship between the volume change and pressure change in a fluid?
A) Hooke's Law
B) Bernoulli's Principle
C) Pascal's Law
D) Boyle's Law

11. What is the bulk modulus of a material?
A) The ratio of stress to strain in shear
B) The ratio of stress to strain in compression or tension
C) The measure of a material's resistance to uniform compression
D) The measure of thermal expansion

12. A wire is stretched from its original length of 2 m to 2.01 m. What is the strain experienced by the wire?
A) 0.005
B) 0.01
C) 0.005 m/m
D) 0.01 m/m

13. Which of the following factors does NOT affect the elasticity of a material?
A) Temperature
B) Material composition
C) Length of the material
D) Cross-sectional area

14. What is the primary reason that rubber exhibits different elastic properties compared to steel?
A) Higher density of rubber
B) Molecular structure and bonding in rubber
C) Thickness of rubber compared to steel
D) Temperature sensitivity of rubber

15. When a material reaches its elastic limit, what happens?
A) It returns to its original shape after unloading
B) It undergoes permanent deformation
C) It becomes brittle and fractures
D) It can no longer support any load

▎Answers

1. B) F = kx

2. B) The force applied per unit area

3. A) Pascal (Pa)

4. D) All of the above

5. A) 20 N

6. B) Stress is directly proportional to strain

7. C) Young's modulus

8. C) It increases

9. C) Lateral contraction is less than the longitudinal extension

10. D) Boyle's Law

11. C) The measure of a material's resistance to uniform compression

12. C) 0.005 m/m

13. D) Cross-sectional area

14. B) Molecular structure and bonding in rubber

15. B) It undergoes permanent deformation

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915 0 8 1 15

Ethio exreme book

31 Mar, 09:12

If the traffic doesn’t clear up, we _____________ arrive on time.

Опрос

A- probably won't
B- won't probably

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889 0 0 12

Ethio exreme book

31 Mar, 09:12

My parents did not let me ______ at that late time of the night.

Опрос

A- go out
B- to go out

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