نماذج - ساينس - اختبار - الترم الأول - ثانية إعدادي - مقرر نوفمبر - مصر

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

1. What is the definition of heat?
   • أ. Energy transferred due to a temperature difference
   • ب. A form of matter
   • ج. A type of radiation
   • د. The mass of an object
2. What happens when two systems at different temperatures come into contact?
   • أ. Heat flows from the hotter system to the colder system
   • ب. Heat flows from the colder system to the hotter system
   • ج. Both systems become colder
   • د. No heat flows between them
3. What is thermal equilibrium?
   • أ. When two systems have the same temperature
   • ب. When two systems have the same mass and same temperature
   • ج. When two systems have the same volume
   • د. When two systems have the same density
4. When 30°C metal balls are mixed with 20°C water, why is the final temperature not 25°C?
   • أ. Because the mixture is made of substances with different masses and specific heats
   • ب. Because the mixture has the same mass
   • ج. Because the mixture has the same specific heat
   • د. Because the mixture is not stirred
5. How is heat transferred along a metal rod?
   • أ. By conduction
   • ب. By convection
   • ج. By radiation
   • د. By evaporation
6. What is thermal conductivity?
   • أ. The ability to transfer heat through a material
   • ب. The ability to reflect heat
   • ج. The ability to absorb heat
   • د. The ability to store heat
7. Which of the following is a good thermal conductor?
   • أ. Copper
   • ب. Plastic
   • ج. Cardboard
   • د. Wood
8. Why are cooking pot handles made of plastic or wood?
   • أ. They are good insulators
   • ب. They are strong
   • ج. They are cheap
   • د. They are good conductors
9. How is heat transferred in fluids?
   • أ. By convection
   • ب. By conduction
   • ج. By insulation
   • د. By radiation
10. Why are cooling systems used in electronic devices?
    • أ. To remove excess heat
    • ب. To increase weight
    • ج. To reduce noise
    • د. To increase performance
11. What causes sea breeze during the day?
    • أ. The land heats faster than the sea
    • ب. The sea and land heat equally
    • ج. The sea heats faster than the land
    • د. The land cools faster than the sea
12. How is heat transferred from the Sun to the Earth?
    • أ. By radiation
    • ب. By conduction
    • ج. By convection
    • د. By reflection
13. Which type of clothing is preferred in summer?
    • أ. Light and loose
    • ب. Black and heavy
    • ج. Shiny and thick
    • د. Dark and tight
14. What do all hot objects emit?
    • أ. Infrared radiation
    • ب. Ultraviolet rays
    • ج. Sound waves
    • د. Light only
15. What is thermography used for?
    • أ. Detecting heat radiation
    • ب. Detecting sound
    • ج. Measuring mass
    • د. Measuring volume
16. What is the scientific term for energy transferred due to temperature difference?
    • أ. Heat
    • ب. Power
    • ج. Light
    • د. Work
17. What is the state when two systems reach the same temperature?
    • أ. Thermal equilibrium
    • ب. Thermal radiation
    • ج. Thermal conduction
    • د. Thermal expansion
18. How is heat transferred in a vacuum?
    • أ. By radiation
    • ب. Not transferred
    • ج. By convection
    • د. By conduction
19. Which is a good heat insulator?
    • أ. Wood
    • ب. Aluminum
    • ج. Copper
    • د. Iron
20. What happens when an ice cube is placed in boiling water?
    • أ. Heat flows from water to ice
    • ب. Heat flows from ice to water
    • ج. Ice gains energy from surroundings
    • د. No heat flows
21. How is heat transferred through ironing clothes?
    • أ. By conduction
    • ب. By convection
    • ج. By evaporation
    • د. By radiation
22. Why does ice melt faster on some materials?
    • أ. Due to higher thermal conductivity
    • ب. Due to shape
    • ج. Due to thickness
    • د. Due to color
23. Which material is a poor conductor of heat?
    • أ. Plastic
    • ب. Copper
    • ج. Silver
    • د. Aluminum
24. Why is the heating coil placed at the bottom of an electric kettle?
    • أ. To heat water by convection
    • ب. To heat water by radiation
    • ج. To reduce electricity use
    • د. To heat water by conduction
25. In which case is heat transferred only by radiation?
    • أ. Heating a rock by the Sun
    • ب. Rubbing hands together
    • ج. Heating water on a stove
    • د. Heating air in the room with a radiator
26. Why are houses in hot areas painted white?
    • أ. To reflect heat
    • ب. To store heat
    • ج. To absorb heat
    • د. To conduct heat
27. How is heat transferred from a heater to a thermometer?
    • أ. Conduction only
    • ب. Convection only
    • ج. Radiation only
    • د. All three methods
28. What is a physical change?
    • أ. A change in state or shape without altering composition
    • ب. A change in chemical composition
    • ج. Formation of new substances
    • د. A change in color only
29. Which of the following is a chemical change?
    • أ. Burning wood
    • ب. Dissolving sugar
    • ج. Melting ice
    • د. Breaking glass
30. What is a chemical reaction?
    • أ. A process where new substances are formed
    • ب. A change in temperature
    • ج. A change in shape
    • د. A change in state
31. What indicates a chemical reaction between baking soda and vinegar?
    • أ. Gas bubbles
    • ب. Color change
    • ج. Formation of a precipitate
    • د. Temperature decrease
32. What happens in a chemical reaction at the molecular level?
    • أ. Atoms are rearranged
    • ب. Atoms remain unchanged
    • ج. Atoms are destroyed
    • د. Atoms are created
33. What indicates a chemical reaction when oil reacts with caustic soda?
    • أ. Formation of a solid
    • ب. Emission of light
    • ج. Color change
    • د. Gas evolution
34. Which is NOT an indicator of a chemical reaction?
    • أ. Change in volume
    • ب. Emission of odor
    • ج. Change in texture
    • د. Formation of a precipitate
35. What safety precaution is needed when burning magnesium?
    • أ. Use a protective mask
    • ب. Use a plastic container
    • ج. Use bare hands
    • د. Use water to cool it
36. What indicates a chemical reaction when sugar is burned?
    • أ. It changes color and emits smoke
    • ب. It becomes harder
    • ج. It dissolves
    • د. It melts
37. Is the expansion of water in a sealed bottle in a freezer a chemical reaction?
    • أ. No, because no new substance is formed
    • ب. Yes, because it changes state
    • ج. No, because it is reversible
    • د. Yes, because it changes volume
38. Why is adding food coloring to water not a chemical reaction?
    • أ. Because no new substance is formed
    • ب. Because it is irreversible
    • ج. Because it forms a new substance
    • د. Because it changes color
39. What is the scientific term for a change that produces new substances?
    • أ. Chemical change
    • ب. Physical change
    • ج. Reversible change
    • د. Temporary change
40. Which of the following is a physical change?
    • أ. Melting of wax
    • ب. Turning milk into yogurt
    • ج. Burning of bread
    • د. Rusting of iron
41. A physical change is characterized by:
    • أ. The composition of the matter does not change
    • ب. Accompanied by light emission
    • ج. The composition of the matter changes
    • د. Produces new substances
42. When iron is exposed to moist air, it undergoes:
    • أ. Rusting
    • ب. Dissolving
    • ج. Evaporation
    • د. Melting
43. The browning of an apple after cutting is considered:
    • أ. A chemical reaction
    • ب. Melting
    • ج. A physical change
    • د. A change of state
44. When sugar is heated, it turns brown due to:
    • أ. A chemical reaction
    • ب. Evaporation
    • ج. Condensation
    • د. Dissolving
45. When hydrochloric acid is added to magnesium, it produces:
    • أ. Hydrogen
    • ب. Nitrogen
    • ج. Oxygen
    • د. Carbon dioxide