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📔Important Scientific Laws,Principles and Theories👇 🔹 Ohm's Law - It states that the current passing through a conductor between two points is directly proportional to the potential difference across the two points provided the physical state and temperature etc. of the conductor does not change. 👍Pauli exclusion principle - It explains that no two electrons in the same atom or molecule can have the same set of quantum numbers. 🔹 Raman effect - It is the change in wavelength that occurs when light is scattered by the atoms or molecules in a transparent medium. 🔹 Tyndall effect - The scattering of light by very small particles suspended in a gas or liquid. 🔹 Boyles's Law - It states that temperature remaining constant, volume of a given mass of a gas varies inversely with the pressure of the gas. Thus, PV = K (constant), where, P = Pressure and V = Volume. 🔹 Charles's Law - It states that pressure remaining constant, the volume of a given mass of gas increases or decreases by 1/273 part of its volume at 0 degree celsius for each degree celsius rise or fall of its temperature. ➔ Coulomb's Law - It states that force of attraction or repulsion between two charges is proportional to the amount of charge on both charges and inversely proportional to the square of the distance between them. 🔹 Heisenberg principle (uncertainty principle) - It is impossible to determine with accuracy both the position and the momentum of a particle such as electron simultaneously. 🔹 Archimede's principle - It states that a body when wholly or partially immersed in a liquid, experiences an upward thrust which is equal to the weight of the liquid displaced by it. Thus, the body appears to lose a part of its weight. This loss in weight is equal to the weight of the liquid displaced by the body. 🔹 Aufbau principle - It states that in an unexcited atom, electrons reside in the lowest energy orbitals available to them. 🔹 Avogadro's Law - It states that equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules. 🔹 Brownian motion - It is a zigzag, irregular motion exhibited by small solid particles when suspended in a liquid or gas due to irregular bombardment by the liquid or gas molecules. 🔹 Bernoulli's principle - It states that as the speed of a moving fluid, liquid or gas, increases, the pressure within the fluid decreases. The aerodynamic lift on the wing of an aeroplane is also explained in part by this principle. 🔹 Gay-Lussac’s Law of combining volumes - Gases react together in volumes which bear simple whole number ratios to one another and also to the volumes of the products, if gaseous — all the volumes being measured under similar conditions of temperature and pressure. 👨🏿‍⚕Graham’s Law of Diffusion - It states that the rates of diffusion of gases are inversely proportional to the square roots of their densities under similar conditions of temperature and pressure. 🔹 Kepler's Law - Each planet revolves round the Sun in an elliptical orbit with the Sun at one focus. The straight line joining the Sun and the planet sweeps out equal areas in equal intervals. The squares of the orbital periods of planets are proportional to the cubes of their mean distance from the Sun. 🔹 Law of Floatation - For a body to float, the following conditions must be fulfilled: The weight of the body should be equal to the weight of the water displaced and the centre of gravity of the body and that of the liquid displaced should be in the same straight line. 🔹 Law of conservation of energy - It states that energy can neither be created nor destroyed but it can be transformed from one form to another. Since energy cannot be created or destroyed, the amount of energy present in the universe is always remain constant.

#Update የ12ኛ ክፍል ብሔራዊ ፈተና የሚሰጥበት ቀን ይፋ ሆነ። የ2016 የትምህርት ዘመን የኢትዮጵያ ሁለተኛ ደረጃ ትምህርት ማጠናቀቂያ (12ኛ ክፍል) ፈተና የሚሰጥበት ቀን ይፋ ሆኗል። የ12ኛ ክፍል ሀገር አቀፍ ፈተና ከሐምሌ 3 እስከ ሐምሌ 5 ለማህበራዊ ሳይንስ ፤ ከሐምሌ  9 እስከ ሐምሌ 11/2016 ዓ/ም ለተፈጥሮ ሳይንስ ተፈታኞች በበይነ መረብ (Online) እና በዩኒቨርሲቲ ውስጥ በወረቀት ይሰጣል። በወረቀት ላይ የሚፈተኑ የማህበራዊ ሳይንስ ተፈታኞች ከሰኔ 30 እስከ ሐምሌ 01/2016 ዓ/ም እንዲሁም የተፈጥሮ ሳይንስ ከሐምሌ 6 እስከ 7/2016 ዓ/ም ወደ ዩኒቨርስቲ የሚገቡ ይሆናል።  መረጃው የትምህርት ምዘናና ፈተናዎች አገልግሎት ነው። @tikvahethiopia

📄Synonym test📄 1. PLACID most nearly means A. calm B. lazy C. solemn D. devious ANS: -A placid means free of disturbance, or calm 2. RESOLVE most nearly means A. turn B. puzzle C. decide D. want ANS: - C one meaning of resolve is to decide, often to stop from doing something 3. ABIDE most nearly means A. endure B. hate C. attendance D. live ANS: - A to abide means to endure without yielding, or to withstand 4. RESIDE most nearly means A. remain B. home C. dwell D. sediment ANS: -C to reside means to occupy a place as one’s home, or to dwell 5. DIFFIDENT most nearly means A. apathetic B. shy C. arrogant D. quarrelsome ANS: - B diffident means shy or lacking in confidence 6. DEPLETE most nearly means A. decorate B. beg C. exhaust D. hurry ANS: -C (deplete means to reduce or deprive or something essential; exhaust means to empty completely) 7. VOLUNTARY most nearly means A. willing B. charity C. prisoner D. careless ANS: - A voluntary means done by one’s own will, or willing 8. REFUTE most nearly means A. garbage B. deny C. offer D. difficult ANS: -B to refute means to prove wrong, or to deny the truth of 9. CHEAT most nearly means A. stingy B. argue C. freckle D. defraud ANS: -D to cheat means to influence by means of trickery, or to defraud 10. MISERABLE most nearly means A. cruel B. wrong C. unhappy D. miss ANS: -C miserable means in a state of distress or unhappiness please help me by sharing this channel to ur freinds😥😥😥😢

Biology Questions(about plants) 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 23. What is the primary function of plant flowers?     a) Gas exchange     b) Nutrient absorption     c) Reproduction     d) Water storage 24. Which of the following is not a type of plant tissue?     a) Dermal tissue     b) Ground tissue     c) Meristematic tissue     d) Nervous tissue 25. What is the term for the loss of water vapor from plant leaves?     a) Transpiration     b) Evaporation     c) Condensation     d) Precipitation ✅

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