اختبارات - ساينس - 2025 - الإعدادي - الترم الأول - منهج - الصف الثاني - مصر

هذه معاينة نصية للأسئلة للاطّلاع والمراجعة فقط. لخوض الاختبار تفاعليًّا مع تصحيح آلي ونتيجة فورية، اضغط زر «ابدأ الاختبار» أدناه.

1. Which of the following states of matter is characterized by having a fixed shape and a definite volume?
   • أ. Solid state
   • ب. Liquid state
   • ج. Gaseous state
   • د. Plasma state
2. The cellular organelles responsible for the process of light absorption in plants are:
   • أ. Chloroplasts in the cell
   • ب. Mitochondria in the cell
   • ج. Large vacuoles
   • د. The central nucleus of the cell
3. Breaking bonds in the reactants and forming new bonds in the products is called:
   • أ. A real chemical reaction
   • ب. The process of physical fusion
   • ج. The simple process of dissolution
   • د. Physical shape change
4. Proteins are made up of very small basic building blocks called:
   • أ. Different amino acids
   • ب. Simple monosaccharides
   • ج. Water-soluble vitamins
   • د. Large fatty acids
5. The particles of a solid move continuously but in the form of:
   • أ. Localized vibrational motion
   • ب. Rapid random motion
   • ج. Rapid rotational motion
   • د. Extensive translational motion
6. The gas that plants absorb from the air to carry out photosynthesis is:
   • أ. Carbon dioxide gas
   • ب. Pure oxygen gas
   • ج. Inert nitrogen gas
   • د. Inert nitrogen gas C) D)
7. Heat is transferred in solid metal objects primarily through:
   • أ. Thermal diffusion
   • ب. Thermal convection
   • ج. Thermal conduction
   • د. Thermal radiation
8. Transforming matter from the gaseous state to the liquid state is called:
   • أ. The process of condensation by cooling
   • ب. The process of freezing by cooling
   • ج. The process of fusion by heat
   • د. The process of rapid evaporation
9. The main and fast source for obtaining energy in the human body is:
   • أ. Simple, easy carbohydrates
   • ب. Heavy saturated fats
   • ج. Essential mineral salts
   • د. Strong animal proteins
10. The main product of photosynthesis that stores chemical energy is:
    • أ. Simple glucose sugar
    • ب. Dissolved mineral salts
    • ج. Carbon dioxide gas
    • د. Liquid water molecules
11. Most stages of cellular respiration for energy production occur inside organelles called:
    • أ. The powerful mitochondria
    • ب. The internal cytoplasm of the cell
    • ج. The outer cell wall
    • د. The small ribosomes of the cell
12. A chemical equation must always be balanced to comply with the law of:
    • أ. Conservation of mass
    • ب. Conservation of energy
    • ج. Earth's gravity
    • د. Action and reaction
13. Gases are distinguished from liquids and solids by their high ability to:
    • أ. Be compressed into a small space
    • ب. Maintain their own shape
    • ج. Cohere with very strong forces
    • د. Vibrate in a fixed position
14. The sun's energy reaches us through outer space primarily via:
    • أ. Wave-like thermal radiation
    • ب. Direct thermal contact
    • ج. Physical thermal conduction
    • د. ) Gaseous thermal convection
15. Dietary fibers found in vegetables and fruits help in:
    • أ. Improving the daily digestion process
    • ب. Colouring red blood cells
    • ج. Rapidly increasing body weight
    • د. Building chemical hormones
16. The green pigment that absorbs light in plants is called:
    • أ. Green chlorophyll
    • ب. Colored carotenoids
    • ج. Red hemoglobin
    • د. Dark melanin
17. The transfer of heat in liquids and gases through the movement of molecules is called:
    • أ. Continuous thermal convection
    • ب. Long-distance thermal radiation
    • ج. Strong kinetic friction
    • د. Direct thermal conduction
18. A substance that increases the rate of a reaction without being consumed is called:
    • أ. A catalytic agent (catalyst)
    • ب. The continuous liquid solvent
    • ج. The solid precipitate formed
    • د. A sensitive colorimetric reagent
19. Dust particles move randomly in the air in a motion known as:
    • أ. Random Brownian motion
    • ب. Kinetic conduction phenomenon
    • ج. Thermal diffusion phenomenon
    • د. Optical radiation phenomenon
20. Fats are used in the body of a living organism mainly for:
    • أ. Energy storage
    • ب. Building muscles and tissues
    • ج. Transmitting genetic traits
    • د. Cooling the body
21. The element iron is very essential in the human body for the formation of:
    • أ. Hemoglobin in the blood
    • ب. Protection of the thin cell membrane
    • ج. Strong bones and teeth
    • د. The plant cell wall
22. A deficiency of vitamin C in a person's daily diet leads to:
    • أ. Bleeding gums and weakened immunity
    • ب. Soft bones and easy fractures
    • ج. Poor vision and night blindness
    • د. Hair loss and dry skin
23. The intermolecular spaces between the particles of matter are greatest in:
    • أ. The diffused gaseous state
    • ب. The cohesive solid state
    • ج. The frozen cold state
    • د. The flowing liquid state
24. The breakdown of food molecules to produce energy inside the cell is called:
    • أ. The process of cellular respiration
    • ب. The process of plant transpiration
    • ج. The simple process of fermentation
    • د. The process of photosynthesis
25. Melting occurs when the particles of a substance gain enough energy to:
    • أ. Overcome the attractive forces
    • ب. Stop the movement of particles
    • ج. Reduce the intermolecular spaces
    • د. Increase the bonding forces between them
26. A gas is released as a byproduct of the photosynthesis process, which is:
    • أ. Oxygen
    • ب. Hydrogen
    • ج. Methane
    • د. Nitrogen
27. During photosynthesis, light energy is converted into:
    • أ. Stored chemical energy
    • ب. Visible magnetic energy
    • ج. Audible sound energy
    • د. Mechanical kinetic energy
28. According to the particle theory, the particles of a single substance are:
    • أ. Exactly identical in their properties
    • ب. Completely different from each other
    • ج. Visible to the naked eye
    • د. Completely stationary
29. The reaction of an acid with a base to produce a salt and water is called:
    • أ. Chemical neutralization
    • ب. Chemical combustion
    • ج. Chemical exchange
    • د. Chemical decomposition
30. The process of cellular respiration consumes glucose and produces energy along with:
    • أ. Carbon dioxide and water
    • ب. Nitrogen gas and atmospheric dust
    • ج. Alcohol and mineral salts
    • د. Oxygen gas and liquid water
31. he total energy stored within the particles that make up matter is called:
    • أ. The internal energy of matter
    • ب. Static electrical energy
    • ج. Potential chemical energy
    • د. The total mechanical energy
32. The conversion of complex food into simple, easily absorbed substances is called:
    • أ. The process of digestion
    • ب. The process of respiration
    • ج. The process of excretion
    • د. The process of circulation
33. The substances we start a reaction with, found on the left side of the equation, are:
    • أ. The initial reactants
    • ب. The final products
    • ج. The assisting catalytic agents
    • د. The resulting soluble salts
34. 4g of (A) reacted with 6g of (B), producing 9g of (C). What is the mass of product (D)?
    • أ. 1g
    • ب. 4g
    • ج. 3g
    • د. 2g
35. The plasma state is a distinct state of matter found prominently in:
    • أ. Stars and lightning phenomena
    • ب. Oceans and deep seas
    • ج. The rocky interior of the Earth
    • د. Mountains and icy peaks
36. Which of the following materials is considered a complex carbohydrate?
    • أ. White rice powder
    • ب. Pure olive oil
    • ج. Fine table sugar
    • د. Rock salt
37. The relationship between photosynthesis and cellular respiration ensures:
    • أ. A balance in gas ratios
    • ب. A constant increase in carbon
    • ج. The stoppage of material cycles
    • د. A complete depletion of oxygen
38. When a substance gains thermal energy, the speed of its particles:
    • أ. Increases and their motion accelerates
    • ب. Decreases and their motion slows down
    • ج. ) Stops completely
    • د. Remains constant and does not change
39. A chemical reaction that releases heat to the surroundings is called:
    • أ. An exothermic reaction
    • ب. A simple reversible reaction
    • ج. A thermally neutral reaction
    • د. An endothermic reaction
40. Transforming matter from the liquid state to the gaseous state is called:
    • أ. Evaporation
    • ب. Boiling
    • ج. Freezing
    • د. Condensation
41. If an object's temperature is 20°C, what is its value in Kelvin (K)?
    • أ. 293
    • ب. 313
    • ج. 273
    • د. 253
42. Which of the following elements is considered an important mineral salt for the body?
    • أ. Calcium
    • ب. Hydrogen
    • ج. Carbon
    • د. Nitrogen
43. Heat is transferred in liquids through currents called:
    • أ. Conduction currents
    • ب. Convection currents
    • ج. Diffusion currents
    • د. Radiation currents
44. What is the name of the compounds formed from the union of monosaccharides?
    • أ. Complex carbohydrates
    • ب. Diverse proteins
    • ج. Oily lipids
    • د. Nucleic acids
45. The primary function of mitochondria in the cell is:
    • أ. Producing energy for the cell
    • ب. Controlling cell division
    • ج. Carrying out photosynthesis
    • د. Storing water and salts
46. When heat transfers between two bodies, the transfer stops when:
    • أ. Their temperatures become equal
    • ب. Their temperatures are different
    • ج. The mass of the hot body decreases
    • د. The volume of the cold body increases
47. In the photosynthesis equation: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, if the plant consumes 12 water molecules, how many oxygen molecules are produced?
    • أ. 12 molecules
    • ب. 24 molecules
    • ج. 18 molecules
    • د. 6 molecules
48. The main location where photosynthesis occurs in plants is:
    • أ. Leaves
    • ب. Stems
    • ج. Flowers
    • د. Roots
49. Aerobic cellular respiration primarily requires the presence of:
    • أ. Oxygen
    • ب. Nitrogen
    • ج. Carbon dioxide
    • د. Hydrogen
50. A chemical equation consists of two sides always separated by:
    • أ. An arrow
    • ب. A comma
    • ج. An equals sign
    • د. A period