• Chapter 1 - PHYSICAL WORLD Assignments 1

    E, m, l and G denote energy, mass, angular momentum and gravitational

    constant respectively. Determine the dimensions of EL2 / m5G2

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  • Chapter 1 - PHYSICAL WORLD Assignments 2

    Find the dimensions of latent heat and specific heat?

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  • Chapter 1 - PHYSICAL WORLD Assignments 3

    Give two methods for measuring time intervals?

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  • Chapter 1 - PHYSICAL WORLD Assignments 4

    A radar signal is beamed towards a planet from the earth and its echo is

    received seven minutes later. Calculate the velocity of the signal, if the distance

    between the planet and the earth is 6.3x1010m?

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  • Chapter 1 - PHYSICAL WORLD Assignments 5

    When a planet X is at a distance of 824.7 million kilometers from earth its

    angular diameter is measured to be 35.7211 of arc. Calculate the diameter of ‘X’.

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  • Chapter 1 - PHYSICAL WORLD Assignments 6

    Name physical quantities whose units are electron volt and pascal?

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  • Chapter 1 - PHYSICAL WORLD Assignments 7

    Define S.I. unit of solid angle?

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  • Chapter 1 - PHYSICAL WORLD Assignments 8

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

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  • Chapter 1 - PHYSICAL WORLD Assignments 9

    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 10

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

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  • Chapter 1 - PHYSICAL WORLD Assignments 11

    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 12

    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 13

    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 14

    Write S.I unit of luminous intensity and temperature?

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  • Chapter 1 - PHYSICAL WORLD Assignments 15

    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 16

    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 17

    Write S.I unit of luminous intensity and temperature?

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  • Chapter 1 - PHYSICAL WORLD Assignments 18

    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 19

    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 20

    “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 21

    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 22

     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 23

    (j ) Cloning

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  • Chapter 1 - PHYSICAL WORLD Assignments 24

    (i) Plastic surgery

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  • Chapter 1 - PHYSICAL WORLD Assignments 25

    (h) Purification of water for drinking

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  • Chapter 1 - PHYSICAL WORLD Assignments 26

    (g) Development of new and powerful techniques of chemical and biological warfare).

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  • Chapter 1 - PHYSICAL WORLD Assignments 27

    (f ) Development of nuclear weapons

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  • Chapter 1 - PHYSICAL WORLD Assignments 28

    (e) Putting artificial satellites into orbits around the Earth

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  • Chapter 1 - PHYSICAL WORLD Assignments 29

    (d) Computers for increase in work efficiency

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  • Chapter 1 - PHYSICAL WORLD Assignments 30

    (c) Prenatal sex determination

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  • Chapter 1 - PHYSICAL WORLD Assignments 31

    (b) Television for eradication of illiteracy and for mass communication of news and ideas.

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  • Chapter 1 - PHYSICAL WORLD Assignments 32

    (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 33

    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 34

     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 35

     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 36

    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 37

    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 38

     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 39

    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 40

    "“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 41

    "“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 42

    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 3: Revison
    In the last class, we had completed our Chapter 1 PHYSICAL WORLD. Now today, you are going to revise the whole chapter through summary of the chapter, key points and practice paper, HOTS 
    Please go through all the topics which we had studied till now, their notes. Properly do the assignments, watch videos of the concerned topics.
    If you have any doubt about any topic/point please submit it in the discussion section... it will be answered as soon as possible.
    Now ...you can attempt quiz given of this chapter to check your concept clearance about the chapter.

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