Interactive multiple-choice quiz: اختبار العلوم انسباير الصف الثامن يونيت 2 الوحدة الثالثة الفصل الأول 2026-2027
اختبار تدريبي متميز لمادة العلوم لطلبة الصف الثامن، يغطي الوحدة الثالثة من الفصل الدراسي الأول. يتناول الاختبار مفاهيم المجالات المغناطيسية، والكهرباء الساكنة، والدوائر الكهربائية البسيطة. يهدف هذا التقييم إلى قياس فهم الطلاب لتفاعل الشحنات وتحولات الطاقة وكيفية عمل المولدات.
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اختبار شهادة تدريبي مؤقت للصف والمادة والفصل نفسه.
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.
Examine the two magnetic field models below to answer question. Which system would need an external force to move the magnets closer together?
Explanation
In model X, two similar poles (North and North) are facing each other, creating a repulsive force. An external force is required to push them closer together to overcome this repulsion.
Question 2
2
Points: 1
According to the text, what causes Earth's magnetic field?
Explanation
Earth's magnetic field is generated by the movement of molten iron and nickel in its outer core, which acts like a giant electromagnet.
Question 3
3
Points: 1
What is a magnetic domain?
Explanation
A magnetic domain is a localized region within a magnetic material where the magnetic moments of atoms are aligned in the same direction.
Question 4
4
Points: 1
While doing laundry, Jaimee pulls clothes from the dryer. Some socks cling to a blanket. Which statement explains why the socks cling to the blanket?
Explanation
Static cling in a dryer occurs when different materials rub together and transfer electrons, resulting in opposite charges that attract each other.
Question 5
5
Points: 1
Which statement correctly describes the interaction between electric charges?
Explanation
This is the fundamental law of electric charges: like charges repel and opposite charges attract.
Question 6
6
Points: 1
What happens to the charges on an object when charged particles move from one object to another?
Explanation
When electrons move between objects, one object gains a net negative charge and the other a net positive charge, causing an imbalance (static electricity).
Question 7
7
Points: 1
What is an "electric insulator"?
Explanation
Insulators are materials that resist the flow of electric charges due to their atomic structure.
Question 8
8
Points: 1
A 1.5 V battery is connected to a light bulb with some wires. One of the wires is cut, breaking the circuit. After the wire is cut, what is the electrical potential energy difference across the two ends of the cut wire?
Explanation
In an open circuit, the potential difference across the break is equal to the electromotive force (voltage) of the source, which is 1.5 V in this case.
Question 9
9
Points: 1
What three components do all simple circuits contain?
Explanation
A basic circuit must have a source (like a battery), a load/device (like a bulb), and a path/conductor (like wires) for the current to flow.
Question 10
10
Points: 1
When electric energy is transferred to a lightbulb, what forms of energy does it become?
Explanation
In an incandescent or LED bulb, electric energy is converted primarily into light, but some energy is also released as heat (thermal energy).
Question 11
11
Points: 1
Which materials are identified in the text as electric conductors in which charged particles easily move?
Explanation
Metals like copper and aluminum are excellent conductors because they have free electrons that can move easily through the material.
Question 12
12
Points: 1
Use the figure below to answer the question. How much larger is the magnetic field strength 1 cm from the wire compared to 5 cm from the wire?
Explanation
Based on the graph, at 1 cm the strength is 20 units, and at 5 cm it is 4 units. 20 divided by 4 equals 5.
Question 13
13
Points: 1
What type of energy transfer occurs in a generator?
Explanation
A generator uses mechanical work (like spinning a turbine) to move magnets near wires and generate electrical current.
Question 14
14
Points: 1
Where are magnetic fields around current-carrying wires strongest?
Explanation
The intensity of a magnetic field produced by a wire is inversely proportional to the distance from the wire; thus, it is strongest at the closest point.
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