About This Chapter
Scientific Technology, Machines & Tools - Chapter Summary
In this chapter, x-rays are defined, as well as how pendulums work and are used in physics. How levers, pulleys and inclined planes are used in simple machines is explained. In addition, the definition of a hydrometer and its scales and ranges is covered.
As you progress through the chapter, you'll understand why the invention of the telegraph revolutionized communications and learn more about the telephone and phonograph. Once you have reviewed these lessons, you should be able to:
- Identify the applications for x-rays
- Solve problems involving pendulums
- Explain the mechanical advantages of simple machines
- Describe how pumps work
- Outline the parts and mechanics of the telephone
- Discuss how mariner's compasses and periscopes work
- Compare the types of telescopes and microscopes
- Differentiate between circuit breakers and fuses
As you work through the chapter, contact our instructors if you have additional questions. These study materials have been created by professionals to ensure your learning experience is simple and satisfying. Use the quizzes and chapter tests to gauge how well you understand the material and where you may need to focus additional study.
1. What Are X-rays? - Definition & Uses
This lesson describes X-rays and their many uses, from looking at broken bones to analyzing the rocks on Mars. Learn how X-rays are part of the larger electromagnetic spectrum, which ranges from radio waves to powerful gamma rays.
2. Pendulums in Physics: Definition & Equations
After watching this lesson, you will be able to explain what a pendulum is, why it is an example of simple harmonic motion, and use equations to solve pendulum problems. A short quiz will follow.
3. Simple Machines: Lever, Inclined Plane & Pulley
Discover what a simple machine is and how it operates. Then learn about the mechanical advantages various simple machines such as levers, inclined planes and pulleys give us.
4. How Pumps Work: Operation & Performance
A pump allows us to move liquids or gases from one place to another. Whether it is to pump some hand sanitizer onto your hands to protect you from germs, or to pump gasoline in your vehicle to get you down the road. Suppose you had a flat tire on your bicycle, how would you fix it without a pump? Pumps are all around us, let us take a look at how they work!
5. Hydrometer: Definition, Scales & Uses
Want to know if your milk is pure? You can use a hydrometer! Want to know if your salt water is salty enough for your fish? Use a hydrometer! Learn more about this useful little tool in this lesson.
6. Invention of the Telegraph: History & Overview
In this lesson we explore the invention of the telegraph. One of the most important communication systems of the nineteenth century, the telegraph revolutionized communications, sending messages that previously had taken days in only minutes.
7. Mechanics of the Telephone
Learn about the parts of a basic telephone, and how they work: microphones, earpieces, switches, and wires. See how much you've learned, and take a quiz at the end of this lesson.
8. Phonograph: Definition & Components
A phonograph is a fairly simple device, that has made a big impact in the world. This lesson will go through the components of a phonograph, and how it works to record sound.
9. Mariner's Compass & Periscopes: Definition & Use
Among the many devices a mariner uses, there is a compass. If the vessel a mariner is on is a submarine, he might use a periscope too. This lesson will explain what these devices are, and how they are used.
10. Types of Telescopes: Radio, Reflecting & Refracting Telescopes
Learn about the different types of telescopes that astronomers use: X-ray, radio, gamma ray, reflecting and refracting. Learn what the differences are between them and what different things they show us about the universe.
11. Types of Microscopes: Electron, Light & Fluorescence
Microscopes are used to visualize tiny objects and structures that cannot be seen with the naked eye. In this lesson, learn how light, fluorescence, and electron microscopes work and how they are used in scientific and medical research.
12. The Differences Between Fuses & Circuit Breakers
After completing this lesson, you'll be able to explain what fuses and circuit breakers do and describe the advantages of each. A short quiz will follow.
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Other chapters within the NDA Exam Preparation & Study Guide course
- About the NDA Exam
- Algebra Concepts
- Advanced Algebra Concepts
- Solving Matrices & Determinants
- Trigonometry Concepts
- Geometry & Linear Equations
- Analytic Geometry
- Functions, Limits & Continuity
- Derivative Rules
- Calculations & Applications of Derivatives
- Integral Calculus
- Differential Equations & Applications
- Scalars & Vectors in Algebra
- Visualizing Statistics
- Probability Concepts in Math
- Grammar and Usage
- Improving Reading Comprehension
- Measurements in Physics
- Motion in Physics
- Basics of Work, Power & Energy
- Understanding Heat Transfer
- Sound Waves
- Light, Mirrors & Lenses
- Electric Currents & Power
- The Atom & Structure of Elements
- Chemical Properties of Elements & Substances
- Chemical Symbols, Formulas & Reactions
- Qualities of Living Organisms
- Health Science Basics
- Solar System & Eclipses
- Achievements of Famous Scientists
- Indian History
- Overview of Major World History Events
- World Government Types
- The Earth
- Earth's Oceans, Atmosphere & Climate
- Regional Geography of South Asia
- Modern Day Events in India
- NDA Exam Preparation & Study Guide Flashcards