Science and Technology Quiz
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Questions and Answers

Which of the following is NOT an example of a product of technology?

  • Radio
  • Microchip
  • Plant (correct)
  • Automobile

What is the primary purpose of technology?

  • To explain the natural world
  • To generate new scientific knowledge
  • To study the universe
  • To improve the quality of human life (correct)

What is the relationship between science and technology?

  • Science and technology are completely separate and independent fields.
  • Science is a branch of technology, meaning it requires technology to function.
  • Technology is a subset of science, meaning it is completely dependent on scientific discoveries.
  • Science and technology are intertwined, each using the other to advance their respective fields. (correct)

What is the role of a technologist?

<p>To develop and implement solutions to real-world problems (D)</p> Signup and view all the answers

Which of the following is NOT a way that science and technology contribute to society?

<p>Preservation of historical artifacts (B)</p> Signup and view all the answers

What is the primary characteristic of a scientist?

<p>A systematic approach to gathering and analyzing evidence (D)</p> Signup and view all the answers

Which of these is a significant contribution of science and technology to society?

<p>All of the above (D)</p> Signup and view all the answers

What does the term 'ethical discipline' refer to in the context of scientists?

<p>The importance of scientists adhering to a strict code of conduct in their research (A)</p> Signup and view all the answers

Which of the following is NOT a characteristic of matter?

<p>It can be seen with the naked eye (C)</p> Signup and view all the answers

What is a chemical change?

<p>A change in the chemical identity of matter (B)</p> Signup and view all the answers

Which of the following is NOT a method for separating mixtures?

<p>Distillation (B)</p> Signup and view all the answers

Which of the following is a characteristic of the solid state of matter?

<p>Particles are closely packed and vibrate in fixed positions (A)</p> Signup and view all the answers

Which of the following changes of state involves a decrease in the spacing between particles?

<p>Freezing/Solidification (B)</p> Signup and view all the answers

What is the main difference between physical and chemical changes?

<p>Physical changes involve a change in state and chemical changes involve a change in composition (A)</p> Signup and view all the answers

Which of the following statements about the particle theory of matter is TRUE?

<p>Particles are constantly in motion (D)</p> Signup and view all the answers

Which of the following is an example of diffusion?

<p>The smell of perfume spreading throughout a room (C)</p> Signup and view all the answers

Which of the following is NOT a scientific discipline mentioned as being important for ethical considerations in science?

<p>Innovation (A)</p> Signup and view all the answers

What does the text suggest about the relationship between ethics and science?

<p>Ethics is a crucial aspect of scientific practices and interpretations. (C)</p> Signup and view all the answers

What are the main areas of study in natural science?

<p>The study of the composition of matter and living organisms. (D)</p> Signup and view all the answers

Which scientist mentioned in the text has received the World Food Prize?

<p>Gebisa Ejeta (C)</p> Signup and view all the answers

What is Dr. Tewolde Berhan Gebre Egziabher's primary area of focus in his scientific work?

<p>Environmental conservation and biodiversity (C)</p> Signup and view all the answers

What does the text suggest about the term "science"?

<p>It encompasses a system of knowledge acquisition based on verifiable methods. (D)</p> Signup and view all the answers

What is a key characteristic of ethical principles in science?

<p>They are based on empirical evidence and require justification. (A)</p> Signup and view all the answers

How does the text suggest individuals should approach ethical dilemmas in science?

<p>Consult with experts and use a reasoned, ethical framework to make choices. (D)</p> Signup and view all the answers

Which state of matter has particles that are far apart and can be compressed easily?

<p>Gas (C)</p> Signup and view all the answers

What process is involved when a liquid turns into a solid?

<p>Freezing (A)</p> Signup and view all the answers

Which of the following properties applies to both liquids and solids?

<p>Definite volume (D)</p> Signup and view all the answers

In which state of matter do particles exert pressure equally in all directions?

<p>Gas (D)</p> Signup and view all the answers

Which state of matter is characterized by having a definite shape and volume?

<p>Solid (C)</p> Signup and view all the answers

What is a key characteristic of gases compared to liquids?

<p>Gases can diffuse spontaneously. (B)</p> Signup and view all the answers

Which change of state occurs when a gas changes directly to a solid?

<p>Deposition (B)</p> Signup and view all the answers

Which state of matter cannot be poured?

<p>Solid (D)</p> Signup and view all the answers

What happens to the properties of substances in a mixture?

<p>Each substance retains its own properties. (B)</p> Signup and view all the answers

Which of the following is a characteristic of a homogeneous mixture?

<p>It has uniform composition throughout. (C)</p> Signup and view all the answers

What type of mixture is milk categorized as?

<p>Homogeneous mixture (B)</p> Signup and view all the answers

If magnesium filings and powdered sulfur are heated and react to form magnesium sulfide, what type of substance is formed?

<p>Pure substance (D)</p> Signup and view all the answers

Which of the following is a key difference between pure water and a solution of sodium chloride in water?

<p>Pure water contains no other substances. (C)</p> Signup and view all the answers

Which of the following examples is a heterogeneous mixture?

<p>Soil (D)</p> Signup and view all the answers

Which of the following substances is considered a homogeneous mixture?

<p>Brass (B)</p> Signup and view all the answers

What contributes to air being classified as a mixture?

<p>It has no definite composition. (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic of a heterogeneous mixture?

<p>It has a uniform composition throughout. (D)</p> Signup and view all the answers

What is the meaning of the prefix 'hetero' in the term 'heterogeneous'?

<p>Different (A)</p> Signup and view all the answers

Based on the information provided, which of the following is NOT a heterogeneous mixture?

<p>Sugar solution (B)</p> Signup and view all the answers

Why is a mixture of sulfur and iron filings considered a heterogeneous mixture?

<p>The sulfur and iron particles remain visible and physically separated. (A)</p> Signup and view all the answers

Which of the following best explains the difference between a homogeneous mixture and a heterogeneous mixture?

<p>Homogeneous mixtures have a uniform composition, while heterogeneous mixtures do not. (C)</p> Signup and view all the answers

Which of the following substances is classified as a pure substance based on the information given?

<p>Water (A)</p> Signup and view all the answers

Based on the characteristics of heterogeneous mixtures, which of the following statements is TRUE?

<p>The components of a heterogeneous mixture can be identified by visual inspection or with a magnifying tool. (D)</p> Signup and view all the answers

According to the text provided, which of the following is classified as a heterogeneous mixture?

<p>Dusty air (D)</p> Signup and view all the answers

Flashcards

Science

A systematic method of gaining knowledge about the physical and natural world.

Technology

The use of scientific knowledge to solve real-world problems and improve life.

Technologist

A person who applies scientific and mathematical knowledge to develop tools and solutions.

Applications of Science and Technology

Used in agriculture, medicine, environment, and industrial production.

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Integration of Science and Technology

Science generates knowledge while technology uses that knowledge for solutions.

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Roles in Society

Science and technology address social needs and develop new materials.

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Scientific Method

Systematic gathering and testing of evidence to form conclusions.

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Famous Scientists

Individuals known for their contributions to science and technology, locally and globally.

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Gebisa Ejeta

Ethiopian scientist and World Food Prize winner known for sorghum production.

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Ethical Principle in Science

Guidelines ensuring responsible conduct in scientific research.

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Honesty

Being truthful and transparent in scientific processes and reporting.

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Objectivity

The practice of keeping personal biases away from scientific conclusions.

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Non-Discrimination

Ensuring equal treatment and opportunities in scientific research and application.

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Natural Science

Field of study focused on understanding the physical and natural world.

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World Food Prize

Annual award recognizing contributions to improving the quality and availability of food.

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Particulate nature of matter

The concept that matter is made of tiny particles.

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Physical change

A change in the form of matter without altering its chemical identity.

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Chemical change

A change where one or more substances transform into a new type of matter.

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States of matter

The principal physical forms of matter: solid, liquid, gas.

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Mixture

A combination of two or more substances that can be separated physically.

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Separation techniques

Methods to separate components of mixtures, like filtration or distillation.

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Diffusion

The process where particles spread from an area of high concentration to low concentration.

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Matter

Anything that has mass and occupies space.

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Heterogeneous mixture

A mixture with a non-uniform composition and visible boundaries between components.

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Examples of heterogeneous mixtures

Blood, milk, sand and water, and oil and water are all heterogeneous mixtures.

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Visible boundaries

Heterogeneous mixtures have visible boundaries between different substances within them.

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Components identification

The components in a heterogeneous mixture can be identified easily with the naked eye.

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Homogeneous mixture

A mixture with a uniform composition that appears as one phase.

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Differences in phases

Heterogeneous mixtures contain two or more phases, unlike homogeneous mixtures.

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Identifying mixtures

Mixtures can be classified as heterogeneous or homogeneous based on composition uniformity.

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Blood as a mixture

Blood is a common example of a heterogeneous mixture containing cells and plasma.

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Pure substance

A material with a uniform and unchanging composition, such as elements or compounds.

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Example of a homogeneous mixture

A mixture such as air or brass that is uniform in composition.

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Separation of mixtures

Techniques to physically divide components of a mixture without changing them.

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Properties of mixtures

The individual properties of each component remain unchanged in a mixture.

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Reaction products

New substances formed when two or more reactants undergo a chemical change.

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Properties of Solids

Have definite volume and shape; particles are closely packed.

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Liquid Characteristics

Definite volume, but no fixed shape; take the shape of the container.

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Gas Properties

Have no definite volume or shape; particles are far apart and in constant motion.

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Density Comparison

Solids are denser than liquids; gases have the lowest density.

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Pressure in Gases

Gases exert pressure equally in all directions.

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Diffusion in States

Solids diffuse slowly, liquids diffuse moderately, gases diffuse quickly.

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Change of State

The transformation from one state of matter to another, like melting or evaporation.

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Study Notes

General Science Grade 7 Textbook

  • This textbook is a resource for Ethiopian Grade 7 students.
  • It covers General Science topics.
  • It includes a section on taking good care of the textbook to ensure its longevity.
  • It lists the authors, editors, and evaluators of the textbook.
  • It provides a table of contents for each unit, listing topics and page numbers.
  • Unit 1 is about basic concepts of science, its nature, branches, common lab equipment, uses, safety, and procedures.
  • Unit 2 is about matter in our surrounding, including characteristics and nature of matter, physical and chemical properties of matter, classification of substances, changes in matter (physical and chemical), and separation of mixtures.
  • Unit 3 covers elements, compounds, and chemical reactions, including elements and their representation, compounds and their representation, simple chemical reactions and equations, and uses of chemical reactions in daily situations.
  • Unit 4 is about the cell as the basis of life, including the microscope, cell structure, and functions, examples of cell shapes, different types of organisms, respiration and photosynthesis.
  • Unit 5 is about living things and their diversity, covering the classification of organisms, different kingdoms (Animalia, Plantae, Protista, Monera, and Fungi), and common examples of organisms in each kingdom.
  • Unit 6 discusses Earth in space and includes the shape and dimensions of the Earth, the various parts of the Earth (atmosphere, body), and movement of the Earth (revolution and rotation).
  • Unit 7 is about motion, force, energy and energy resources, covering different types of motion, force, effects of force, measuring forces, different forms of energy, sources of energy, conservation of energy, and resource depletion.

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Grade 7 General Science Textbook PDF

Description

Test your knowledge on the relationships between science and technology, the roles of scientists and technologists, and the characteristics of matter. This quiz covers a variety of concepts important for understanding the contributions of science and technology to society.

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