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Physical World And Measurement

Hello, readers ЁЯШК! Here in this unit ‘Physical World And Measurement’ you can learn about basic concepts of Physics and its Impact on our Society Fundamental Forces in Nature, Four basic Conservation Law, Physical Quantities, Measurement, System of Units, Significant Figures, Errors in Measurement.

What is Science?

The term “science” originates from the Latin word “scientia,” which means “knowledge” or “knowing.” The term “science” in Sanskrit is “рд╡рд┐рдЬреНрдЮрд╛рди” (vij├▒─Бna)

Science is a systematic and evidence-based approach to understanding the natural world. Through observation, experimentation, and analysis, scientists strive to uncover fundamental principles and mechanisms governing the universe. Science has revolutionized society by providing technological advancements, medical breakthroughs, and a deeper understanding of our environment. It encourages critical thinking, fosters curiosity, and promotes innovation.

For the ease of study science is divided in two branches,

  1. Physical Science
    • PHYSICS
    • CHEMISTRY
  2. Life Science/Biology

Physics is a fundamental branch of science that explores the fundamental principles governing the behavior of matter and energy in the universe. It delves into the nature of space, time, forces, motion, and the structure of matter. Physics encompasses a wide range of topics, including mechanics, thermodynamics, electromagnetism, optics, quantum mechanics, and relativity. Through experimental observations and mathematical models, physicists strive to understand the intricacies of the physical world and uncover the underlying laws that govern it. Physics has revolutionized technology, enabling advancements in areas such as electronics, telecommunications, energy, and transportation, and it continues to expand our understanding of the universe and drive further innovations.

Chemistry is the branch of science that deals with the composition, structure, properties, and transformations of matter. It explores the interactions between atoms and molecules, and how they form compounds and undergo reactions. Chemistry plays a vital role in numerous areas, such as medicine, agriculture, materials science, environmental studies, and energy production. It helps us understand the properties and behaviour of substances, enabling the development of new materials, medicines, and technologies. From the microscopic world of atoms to the macroscopic world of chemical reactions, chemistry provides insights into the building blocks of our universe and offers practical applications that impact our daily lives.

Life Science, also known as Biology, is a field of study dedicated to understanding the complexity of living organisms. It explores the diverse forms of life, from microscopic cells to intricate ecosystems. Biology encompasses various sub-disciplines such as botany, zoology, genetics, and microbiology. Through observation, experimentation, and analysis, biologists investigate the structure, function, growth, and interactions of living organisms. They explore topics like evolution, genetics, physiology, ecology, and molecular biology. Life Science plays a vital role in fields like medicine, agriculture, environmental conservation, and biotechnology. It provides insights into the intricate mechanisms of life, enabling us to better understand ourselves and the natural world around us.

Physical World And Measurement

INDEX

Chapter 01 Physical world
1Introduction to Physics and its Impact on our Society
2Fundamental Forces in Nature & Four basic Conservation Law
Chapter-2 Units and measurements
Physical Quantities, Measurement & Need of measurement
System of Units and Practical Units in Measurement, Significant Figures
Errors in Measurement
Accuracy and Precision
Dimensional Analysis

QUIZ from unit Physical World And Measurement

Hello, readers ЁЯШК! Here is a quiz for class 11th PHYSICS on the topics Measurement of physical quantities, Dimensional Analysis and Significant figures. Take the quiz and evaluate yourself.

Measurement QUIZ / MCQs

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Created on By pankaj

Class 11 UNIT 01 Topic: Measurement

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1)

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2) Length cannot be measured by

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3) A Vernier calipers has 1 mm marks on the main scale. It has 20 equal divisions on the Vernier scale which match with 16 men scale divisions. For this Vernier calipers, the list count is

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4) Light year is used to measure

 

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5) Light year is the unit of

 

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6) The diameter of a steel ball is measured using a vernier calipers which has divisions of 0.1 cm on its main scale (MS) and 10 divisions of its vernier scale (VS) match 9 divisions on the main scale (MS). Three such measurements for a ball are given as follow: if the zero error is - 0.03 cm, then mean corrected diameter is

 

measurement

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7) A student measured the length of a rod and wrote it as 3.5 0 cm. Which instrument did he use to measure it ?

 

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8) The difference in the length of a mean solar day and a sidereal day is about

 

 

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9) Three students Arjun, Ravi and Abhishek are asked to find the mass of a piece of metal whose mass is known to be 0.520 gram. They obtained following data.

Which of the following statement is correct regarding observations recorded by students.

measurement

Your score is

The average score is 88%

Hello, readers ЁЯШК! Here is a quiz on the topic Measurement. Take the quiz and evaluate yourself. For more quizzes, go to www.mywebpathshala.com

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Dimensional Analysis QUIZ / MCQs

5
Created on By anirup

UNIT 01 topic: Dimensional Analysis

Hello, readers ЁЯШК! Here is quiz on topic Dimensional Analysis. Participate in quiz and evaluate yourself. For more quizzes be with www.mywebpathshala.com

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1. The force F is given by expression F = A cos(Bx) + C sin(Dt), where x is the displacement and t is the time. Then dimensions of D/B are same as those of

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2. (2) Dimensions of youngтАЩs modulus and shear modulus are

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3. Which one of the following pairs of quantities has the same dimension ?

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4. The dimensional formula of universal gravitational constant is

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5. If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are

 

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6. (1) In which of the following pairs, the two physical quantities do not have the same dimensional formula

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7. The units of Planck's constant are

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8. Which of the following is a Dimensional constant?

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9. Which of the following 5 physical parameters have the same dimensions?
1. Energy density
2. Refractive index
3. Dielectric constant
4. Young's modulus
5. Magnetic field

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10. If x = at + bt┬▓ , where 'x' is the distance travelled by the body in kilometres while 't' is the time in seconds, then the unit of 'b' is

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11. The time dependence of physical quantity 'p' is given by p =po exp(-╬▒t┬▓), where ╬▒ is a constant and t is the time. The constant ╬▒ is

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12. The damping force of an oscillator is directly proportional to the velocity. The units of the constant of proportionality are

Your score is

The average score is 48%

Hello, readers ЁЯШК! Here is a quiz on the topic Dimensional Analysis. Take the quiz and evaluate yourself. For more quizzes, go to www.mywebpathshala.com

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Significant figures QUIZ / MCQs

2
Created on By pankaj

UNIT 01 Topic: Significant figures

Hello, readers ЁЯШК! Here is a quiz on the topic Significant figures. Take the quiz and evaluate yourself. For more quizzes, go to www.mywebpathshala.com

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1) Which of the following is false regarding rules of significant figures

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2) The significant figures of the number 6.0023 are

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3) In which of the following result┬а is/are correctly represented to an appropriate number of significant figures?
1) 7.21+12.141+0.0028 = 19.354
2) 75.5├Ч125.2├Ч0.51=4800

 

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4) The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1├Ч10-┬│ are

Your score is

The average score is 63%

Hello, readers ЁЯШК! Here is a quiz on the topic Significant figures. Take the quiz and evaluate yourself. For more quizzes, go to www.mywebpathshala.com

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