Class 8 Science Annual Exam Quiz: Force, Pressure, Earthquakes, Pollution

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কৰ্বন ডাইঅক্সাইড এটিয়া এটি কোনো প্ৰদূষণ বাবে উৎস বাৰ কৰিছে?

গ্ৰীনহাউচ গেছছেছ প্ৰদূষণৰ বাবে কোৱা ডাইঅক্সাইড

কোন প্ৰদূষণ হাৰক হিংসাত্মক সমস্যা উপদেশ দিলে?

কোনো ধূল, ধোঁৱা আৰু সুট

নাইট্ৰেট আৰু ফ'সফেট কোনো প্ৰদূষণৰ বাবে কোনো গুৰুত্বপূৰ্ণ উৎস?

সৰুপানিৰ ইউট্ৰোফিকেশ্ন

এখন প্ৰদূষণৰ বাবে কোনো জীভ বিকারক মৰম কৰিলে?

লেড, মাৰ্কুৰি, আৰু আৰ্সেনিক

আধুনিক প্ৰদূষণৰ বাবে লুৰ উৎস কোনটো?

ভাৱাণী সেচনা

বল কি?

বস্তুৰ গতি, দিক অথবা আকাৰ সলনি কৰিবলৈ দক্ষিণা অথবা টান হৈছে।

প্ৰেছাৰ কি?

একক এলাকাত প্ৰয়োগ কৰা বল।

প্ৰাথমিক ভূকম্পৰ কাৰণ কি?

ভূ-তালৰ চুলৰ চমকনী শক্তিৰ হতবাৰ পৰা উৎপন্ন হোৱা ভূকম্প।

ভাতৰ সৰাবোৰ দুই প্ৰকাৰৰ?

এখন পথিত সৰাবোৰ আৰু সৰফেচ সৰাবোৰ।

প্ৰদূষণ কি?

প্ৰদূষণ পদাৰ্থবিশিষ্ট মাইক্ৰ’অৰ বাতৰিণীত প্ৰৱেশ কৰা, জীৱন্তৰ গুণ হানি কৰা।

Study Notes

Class 8 Annual Exam Science Questions: Exploring Force, Pressure, Earthquakes, and Pollution

As you prepare for your Class 8 annual exams, here's a deep dive into some of the most fascinating topics you'll encounter in your science syllabus. This article will explore force and pressure, earthquakes, and the vital concepts of air and water pollution.

Force and Pressure

Force is a push or a pull that causes an object to change its speed, direction, or shape. Newton's second law of motion tells us that force equals mass times acceleration (F=ma). Pressure is defined as the force applied per unit area. Mathematically, you can calculate pressure as force divided by area (P=F/A). This relationship is a fundamental principle in many scientific disciplines, including fluid dynamics, atmospheric science, and material science.

Earthquakes

Earthquakes are the result of the sudden release of built-up elastic strain energy in the Earth's crust, often caused by the movement of tectonic plates. Three types of earthquake waves are generated: primary (P-waves), secondary (S-waves), and surface waves. P-waves travel fastest, while S-waves and surface waves travel slower. Earthquake magnitude measures the size of an earthquake, while the Richter scale is used to express it numerically.

Air and Water Pollution

Pollution is the introduction of contaminants into the environment, degrading its quality. Air pollution, for instance, is caused by human activities such as burning fossil fuels and industrial waste emissions. Water pollution, on the other hand, is caused by contamination of water bodies due to agricultural runoff, industrial discharges, and urban wastewater.

Some key pollutants that you should be familiar with include:

  • Greenhouse gases like carbon dioxide, methane, and nitrous oxide, which contribute to global warming.
  • Particulate matter, such as dust, smoke, and soot, which can lead to respiratory disorders when breathed in.
  • Nutrients like nitrate and phosphate, which can cause eutrophication in water bodies and lead to the growth of algae and other aquatic plants.
  • Heavy metals like lead, mercury, and arsenic, which can be toxic when ingested or inhaled.

Preparing for Exams

As you study these topics, remember that the goal is not just to memorize facts, but also to understand the concepts and their applications. Use diagrams and models to visualize the relationships between these ideas, and don't hesitate to practice solving problems and applying the concepts to real-world examples.

Good luck on your exams! With a solid understanding of these topics, you'll be well-equipped to tackle the challenges of science in Class 9 and beyond.

Prepare for your Class 8 annual science exams with questions on force, pressure, earthquakes, and pollution. Explore key concepts like Newton's laws, earthquake waves, and types of pollution to enhance your understanding and excel in your exams.

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