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Fundamental forces in nature ; Nature of Physical laws

  • Chapter 1 - PHYSICAL WORLD Assignments 1

    Name physical quantities whose units are electron volt and pascal?

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  • Chapter 1 - PHYSICAL WORLD Assignments 2

    Define S.I. unit of solid angle?

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  • Chapter 1 - PHYSICAL WORLD Assignments 3

    What is the difference between Ao and A.U.?

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  • Chapter 1 - PHYSICAL WORLD Assignments 4

    Young’s modulus of steel is 19´ 1010 N/m2. Express it in dynes cm2. Here

    dynes are the C.G.S unit of force.

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  • Chapter 1 - PHYSICAL WORLD Assignments 5

    If velocity, time and force were chosen the basic quantities, find the dimensions
    of mass?

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  • Chapter 1 - PHYSICAL WORLD Assignments 6

    Two resistances R1 = 100 ±3W and R2 = 200 ±4W are connected in series. Then
    what is the equivalent resistance?

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  • Chapter 1 - PHYSICAL WORLD Assignments 7

    If force (F) acceleration (A) and time (T) are taken as fundamental units, then
    find the dimension of energy.

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  • Chapter 1 - PHYSICAL WORLD Assignments 8

    Calculate the time taken by the light to pass through a nucleus of diameter 1.56´ 10-16 m. (speed of light is 3´ 108 m/s)

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  • Chapter 1 - PHYSICAL WORLD Assignments 9

    Fill ups.

    (i) 3.0m/s2 = --------------------- km/hr2

    (ii) 6.67 10-11 Nm2/kg2 = ------------------------- g-1cm3s-2

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  • Chapter 1 - PHYSICAL WORLD Assignments 10

    If x = at + bt2 where x is in meters and t is in seconds. What are the units of a

    and b?

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  • Chapter 1 - PHYSICAL WORLD Assignments 11

    Write S.I unit of luminous intensity and temperature?

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  • Chapter 1 - PHYSICAL WORLD Assignments 12

    Fill ups.

     

    (i) 3.0m/s2 = --------------------- km/hr2

     

    (ii) 6.67 10-11Nm2/kg2 = ------------------------- g-1cm3s-2

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  • Chapter 1 - PHYSICAL WORLD Assignments 13

    If x = at + bt2 where x is in meters and t is in seconds. What are the units of a and b?

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  • Chapter 1 - PHYSICAL WORLD Assignments 14

    “It is more important to have beauty in the equations of physics than to have them agree with experiments”. The great British physicist P. A. M. Dirac held this view. Criticize this statement. Look out for some equations and results in this book which strike you as beautiful.

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  • Chapter 1 - PHYSICAL WORLD Assignments 15

    Though the law gives women equal status in India, many people hold unscientific views on a woman’s innate nature, capacity and intelligence, and in practice give them a secondary status and role. Demolish this view using scientific arguments, and by quoting examples of great women in science and other spheres; and persuade yourself and others that, given equal opportunity, women are on par with men.

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  • Chapter 1 - PHYSICAL WORLD Assignments 16

     India has had a long and unbroken tradition of great scholarship — in mathematics, astronomy, linguistics, logic and ethics. Yet, in parallel with this, several superstitious and obscurantist attitudes and practices flourished in our society and unfortunately continue even today — among many educated people too. How will you use your knowledge of science to develop strategies to counter these attitudes ?

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  • Chapter 1 - PHYSICAL WORLD Assignments 17

    (a) Mass vaccination against small pox to curb and finally eradicate this disease from the population. (This has already been successfully done in India).

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  • Chapter 1 - PHYSICAL WORLD Assignments 18

    science, like any knowledge, can be put to good or bad use, depending on the user.Given below are some of the applications of science. Formulate your views on whether the particular application is good, bad or something that cannot be so clearly categorized

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  • Chapter 1 - PHYSICAL WORLD Assignments 19

     Attempt to formulate your ‘moral’ views on the practice of science. Imagine yourself stumbling upon a discovery, which has great academic interest but is certain to have nothing but dangerous consequences for the human society. How, if at all, will you resolve your dilemma?

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  • Chapter 1 - PHYSICAL WORLD Assignments 20

     It is often said that the world is witnessing now a second industrial revolution, which will transform the society as radically as did the first. List some key contemporary areas of science and technology, which are responsible for this revolution.

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  • Chapter 1 - PHYSICAL WORLD Assignments 21

    The industrial revolution in England and Western Europe more than two centuries ago was triggered by some key scientific and technological advances. What were these advances ?

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  • Chapter 1 - PHYSICAL WORLD Assignments 22

    The shells of crabs found around a particular coastal location in Japan seem mostly to resemble the legendary face of a Samurai. Given below are two explanations of this observed fact. Which of these strikes you as a scientific explanation ? 

    (a) A tragic sea accident several centuries ago drowned a young Samurai. As a tribute to his bravery, nature through its inscrutable ways immortalized his face by imprinting it on the crab shells in that area.

    (b) After the sea tragedy, fishermen in that area, in a gesture of honor to their dead hero, let free any crab shell caught by them which accidentally had a shape resembling the face of a Samurai. Consequently, the particular shape of the crab shell survived longer and therefore in course of time the shape was genetically propagated. This is an example of evolution by artificial selection. 

    [Note : This interesting illustration taken from Carl Sagan’s ‘The Cosmos’ highlights the fact that often strange and inexplicable facts which on the first sight appear ‘supernatural’ actually turn out to have simple scientific explanations. Try to think out other examples of this kind].

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  • Chapter 1 - PHYSICAL WORLD Assignments 23

     No physicist has ever "“seen"” an electron. Yet, all physicists believe in the existence of electrons. An intelligent but superstitious man advances this analogy to argue that ‘ghosts’ exist even though no one has '‘seen'’ one. How will you refute his argument?

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  • Chapter 1 - PHYSICAL WORLD Assignments 24

    Though India now has a large base in science and technology, which is fast expanding, it is still a long way from realizing its potential of becoming a world leader in science. Name some important factors, which in your view have hindered the advancement of science in India.

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  • Chapter 1 - PHYSICAL WORLD Assignments 25

    "“Politics is the art of the possible"”. Similarly, “"Science is the art of the soluble"”. Explain this beautiful aphorism on the nature and practice of science.

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  • Chapter 1 - PHYSICAL WORLD Assignments 26

    "“Every great physical theory starts as a heresy and ends as a dogma"”. Give some examples from the history of science of the validity of this incisive remark.

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  • Chapter 1 - PHYSICAL WORLD Assignments 27

    Some of the most profound statements on the nature of science have come from Albert Einstein, one of the greatest scientists of all time. What do you think did Einstein mean when he said : “The most incomprehensible thing about the world is that it is comprehensible”?

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    • Description:-

    Lecture 2 :
    Today, we will discuss the next two topics, i.e; Fundamental forces in nature ; Nature of Physical laws from chapter 1 PHYSICAL WORLD
    OBJECTIVES:
    1:  Concepts about Fundamental forces in nature ; Nature of Physical laws
    Important Tip:
     This lecture about PHYSICAL WORLD is base for the further chapters. These topics help in many ways as to understand the and how we can use them. It help you in further studies also.
    Please go through the topic, their notes. Properly do the assignments, watch videos of the concerned topics. If you any doubt about any topic/point please submit it in the discussion section... it will be answered as soon as possible.
    After all of this... when you fell confident about the particular topic/chapter then take the quiz.

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