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Репост из: QuickLearn Ethiopia
SOME PHYSICS LAWS
Newton's First Law of Motion - An object at rest tends to stay at rest, and an object in motion tends to stay in motion, with the same direction and speed in a straight line unless acted upon by some external force.

➢ 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.
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የቱ Subject ይላል?


A data set has a range of 50 and an inter-quartile range (IQR) of 20. If the maximum value of the data set is increased by 10, what happens to the range and IQR?
Опрос
  •   A) Range increases by 10, IQR remains unchanged
  •   B) Range increases by 10, IQR increases by 10
  •   C) Range remains unchanged, IQR increases by 10
  •   D) Range increases by 10, IQR decreases by 10
41 голосов


1: Mean Deviation about the Median Given the following data set:  12, 15, 18,  20, 22, 25, 30, 35, 40, 45  What is the mean deviation about the median?
Опрос
  •   A) 8.4
  •   B) 9.2
  •   C) 10.5
  •   D) 11.8
27 голосов


College_Physics_11th_Edition_Serway_Vuil.pdf
45.5Мб
connection እያስቸገረ በስንት መከራ ቃላችንን ለማክበር post አድርገን star አያሸልምም ትላላችሁ fam ለማንኛውም ይመቻችሁ react and share አይለየን




የቱ Subject ይከብዳል?


Репост из: QuickLearn Ethiopia
🧪🧪 The Solution process

1🔮,Breaking up the solute solute inter particle force
2 🔮,Breaking up the solvent solvent inter particle force
3🔮,formation of solute solvent interaction.

🫧the extent of dissolution of a solute in a solvent is governed by intermolecular force
❄The energy change associated with the dissolution process and entropy that result when 💥molecules of the solute and solvent mix to form a solution are the forces driving the solution.

✨✨ the formation of a solution from a solvent is 🥁physical process not chemical change

🌧🌧Liquid solutions and inter particle force of attraction

☃when 1 substance dissolved in another, particles of the solute dispersed throughout the solvent
🌈 The solute particle occupy position that are normally taken by solvent molecule

Types of inter particle force
👑 Solute Solute interaction
🎩 solvent solvent interaction
🎭 Solute Solvent interaction

🥁Dipole moment :- measure of molecular polarity

Ok Guys still next part don't forget reaction 😘😘
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How old are you?


19. What is the primary function of a capacitor in an electronic circuit?
- a) To store electrical charge
- b) To limit the flow of current
- c) To amplify signals
- d) To convert AC to DC
- Answer: a) To store electrical charge

20. What is the primary function of a resistor in an electronic circuit?
- a) To store electrical charge
- b) To limit the flow of current
- c) To amplify signals
- d) To convert AC to DC
- Answer: b) To limit the flow of current

21. What is the primary function of an inductor in an electronic circuit?
- a) To store electrical charge
- b) To store energy in a magnetic field
- c) To amplify signals
- d) To convert AC to DC
- Answer: b) To store energy in a magnetic field

22. What is the primary function of a transformer?
- a) To store electrical charge
- b) To amplify signals
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: d) To step up or step down voltage

23. What is the primary function of a rectifier?
- a) To store electrical charge
- b) To amplify signals
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: c) To convert AC to DC

24. What is the primary function of an amplifier?
- a) To store electrical charge
- b) To increase the power of a signal
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To increase the power of a signal

25. What is the primary function of an oscillator?
- a) To store electrical charge
- b) To generate a periodic signal
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To generate a periodic signal

26. What is the primary function of a microcontroller?
- a) To store electrical charge
- b) To control other electronic components
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To control other electronic components

27. What is the primary function of a voltage regulator?
- a) To store electrical charge
- b) To maintain a constant voltage level
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To maintain a constant voltage level

28. What is the primary function of a relay?
- a) To store electrical charge
- b) To switch circuits on and off
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To switch circuits on and off

29. What is the primary function of a sensor in an electronic circuit?
- a) To store electrical charge
- b) To detect changes in the environment and convert them into electrical signals
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To detect changes in the environment and convert them into electrical signals

30. What is the primary function of a display in an electronic circuit?
- a) To store electrical charge
- b) To show information visually
- c) To convert AC to DC
- d) To step up or step down voltage
- Answer: b) To show information visually

---

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### Unit 5: Basics of Electronics

#### Multiple Choice Questions (MCQs)📘🌹

1. What is a semiconductor?
a) A material that conducts electricity perfectly
b) A material that does not conduct electricity at all
c) A material with electrical conductivity between a conductor and an insulator
d) A material that only conducts electricity at high temperatures
Answer: c) A material with electrical conductivity between a conductor and an insulator

2. Which of the following is a common semiconductor material?
a) Copper
b) Silicon
c) Aluminum
d) Gold
Answer: b) Silicon

3. What is the primary function of a diode?
a) To amplify signals
b) To allow current to flow in one direction only
c) To store electrical charge
d) To convert AC to DC
Answer: b) To allow current to flow in one direction only

4. What is rectification?
a) The process of converting AC to DC
b) The process of converting DC to AC
c) The process of amplifying signals
d) The process of storing electrical charge
Answer: a) The process of converting AC to DC

5. Which type of diode is commonly used for rectification?
a) Zener diode
b) Light-emitting diode (LED)
c) PN junction diode
d) Schottky diode
Answer: c) PN junction diode

6. What is the main function of a transistor?
a) To store electrical charge
b) To amplify or switch electronic signals
c) To convert AC to DC
d) To allow current to flow in one direction only
Answer: b) To amplify or switch electronic signals

7. Which of the following is a type of transistor?
a) BJT (Bipolar Junction Transistor)
b) LED (Light-Emitting Diode)
c) Zener diode
d) Capacitor
Answer: a) BJT (Bipolar Junction Transistor)

8. What is an integrated circuit (IC)?
a) A single electronic component
b) A combination of multiple electronic components on a single chip
c) A type of diode
d) A type of transistor
Answer: b) A combination of multiple electronic components on a single chip

9. Which of the following is a logic gate?
a) AND gate
b) Diode
c) Transistor
d) Capacitor
Answer: a) AND gate

10. What is the output of an AND gate if both inputs are 1?
a) 0
b) 1
c) Undefined
d) Depends on the gate
Answer: b) 1

11. What is the output of an OR gate if both inputs are 0?
a) 0
b) 1
c) Undefined
d) Depends on the gate
Answer: a) 0

12. What is the function of a NOT gate?
a) It inverts the input signal
b) It amplifies the input signal
c) It stores the input signal
d) It converts AC to DC
Answer: a) It inverts the input signal

13. Which logic gate produces a 1 output only when all inputs are 1?
a) AND gate
b) OR gate
c) NOT gate
d) NAND gate
Answer: a) AND gate

14. Which logic gate produces a 1 output if any of the inputs is 1?
a) AND gate
b) OR gate
c) NOT gate
d) NAND gate
Answer: b) OR gate

15. What is the output of a NAND gate if both inputs are 1?
a) 0
b) 1
c) Undefined
d) Depends on the gate
Answer: a) 0

16. What is the output of a NOR gate if both inputs are 0?
a) 0
b) 1
c) Undefined
d) Depends on the gate
Answer: b) 1

17. What is the primary use of a Zener diode?
a) To amplify signals
b) To regulate voltage
c) To store electrical charge
d) To convert AC to DC
Answer: b) To regulate voltage

18. What is the primary use of a light-emitting diode (LED)?
a) To amplify signals
b) To emit light when current flows through it
c) To store electrical charge
d) To convert AC to DC
Answer: b) To emit light when current flows through it
Continue👉👇👉👇


Репост из: QUBEE ACADEMY
math's G12 Unit 3 UEE 2008 - 2016 @qubeeacademy.pdf
1.0Мб
#Maths UEE from Grade 12 #Unit 3

#2010 - 2016 UEE
#Target Grade 12 students

#Qubeeacademy
Answer with details Explanation
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Natural or Social ናቹ?


Natural or Social ናቹ?



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Репост из: QuickLearn Ethiopia
Grade 12 Maths units 1-4 worksheet.pdf
1.1Мб
Mathematics worksheet
For G12
Prepared by beddele ifaa boru special boarding school
Ketemachachaw react adirigu
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