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اختبار اختيار من متعدد تفاعلي: اختبار العلوم لدرس التقنية الاصطناعية - الصف السابع
Synthetic technology involves the creation of man-made materials by chemically transforming natural resources. This process often includes polymerization, where monomers bond into long chains to create polymers like polypropylene, which is used for its strength and flexibility in products like drinking straws. Scientists also develop composites like fiberglass and advanced materials like aramid fibers, which provide exceptional strength for safety gear. Understanding how the molecular structure of a material determines its properties and function is essential for creating new technologies that mimic nature's designs.
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اختبار شهادة تدريبي مؤقت للصف والمادة والفصل نفسه.
ابدأ السباق ✨
اختر إجابة واحدة لكل سؤال. عند الاختيار ستظهر النتيجة فورًا: الأخضر صحيح، والأحمر خطأ، وسيظهر تفسير الإجابة مباشرة إن كان متوفرًا. وبعد آخر سؤال ستظهر الدرجة النهائية تلقائيًا.
What is the primary definition of a "material"?
A
The matter from which a substance is or can be made
B
A substance that only exists in a laboratory
C
A finished product ready for consumer use
D
Anything that has been modified by humans
Explanation
A material is defined as the physical matter used to create substances or objects.
Which of the following best describes a synthetic material?
A
Physical matter obtained directly from plants or animals
B
Any natural resource that has undergone very little modification
C
A material obtained from natural resources that underwent a chemical reaction
D
A material that exists on Earth regardless of human presence
Explanation
Synthetic materials are created through chemical reactions that transform natural resources into new substances with different properties.
what does the term "technology" refer to?
A
The use of computers to design new products
B
The process of harvesting natural resources
C
The practical use of scientific knowledge
D
The microscopic study of sea cucumbers
Explanation
Technology is the application of scientific knowledge for practical purposes and to solve human problems.
Polymerization is a chemical process where:
A
Large molecules are broken down into smaller organic monomers
B
Small organic molecules called monomers bond together to form a chain
C
Natural materials are physically mixed without changing their bonds
D
Atoms are removed from a substance to make it lighter
Explanation
Polymerization is the chemical process of linking small molecules called monomers into long chains called polymers.
Which synthetic material is characterized as being strong and flexible, and is used to make drinking straws?
A
Rayon
B
Aramid fiber
C
Polypropylene
D
Fiberglass
Explanation
Polypropylene is a plastic polymer used for straws because it is both strong and flexible.
What is a characteristic property of ceramics?
A
Flexible and able to be spun
B
Strong but brittle, and good insulators
C
Designed specifically to mimic vitamin C
D
Strong and flexible
Explanation
Ceramics are known for being strong under pressure but brittle (easy to break if dropped) and effective at insulating against heat and electricity.
How does the structure of a material relate to its function?
A
Structure is irrelevant as long as the material is colorful
B
The properties of a material determine its behavior and how it is used
C
Function is determined only by the price of the material
D
Natural materials have no specific function until they become synthetic
Explanation
The internal structure of a material gives it specific properties, which in turn determine what functions it can perform and how it can be used.
Aramid fiber, discovered by Stephanie Kwolek, is best known for its use in:
A
Bulletproof vests and tires
B
Drinking straws and food packaging
C
Cement and building tiles
D
Vitamin C and hydrogenated oils
Explanation
Aramid fibers are exceptionally strong and heat-resistant, making them ideal for protective gear like bulletproof vests and heavy-duty tires.
which of these is an example of a composite?
A
Fiberglass
B
Nylon
C
Acrylic
D
Red 40
Explanation
Fiberglass is a composite material because it combines glass fibers with a plastic resin to create a material with improved properties.
What must happen for a natural material to become a synthetic material?
A
It must be moved from the ground to a factory
B
Atoms must rearrange and form new molecules through a chemical reaction
C
It must be combined with at least three other natural materials
D
It must be polished and cleaned to improve its appearance
Explanation
Synthetic materials are defined by the chemical changes that rearrange atoms and molecules from natural sources to create entirely new substances.
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