Science is a systematically organized knowledge of the natural and social world which is gained through experimental observations (Measurement and data) and logic. It is the study of the nature and behaviour of natural things. It can be classified into two parts: (i) The science which deals with non-living things is called physical science. (ii) The science which deals with living things is called biological science. Note: (i) This classification does not separate various branches with each other. In fact, these branches merge to study nature and its laws. (ii) Physics is a branch of science which deals with the study of nature and natural phenomenon. The study includes study of winds, clouds, sun, nucleus and phenomenon like occurrence of day and night, orbiting of planets, formation of rainbow, etc.

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What are the two principal thrusts in physics?

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Important Questions on Physical World

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Physics>Mechanics>Physical World>Understanding Physics

Methane is greenhouse gas because-

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Physics>Mechanics>Physical World>Understanding Physics

In a particle accelerator, a current of

500 μ A

is carried by a proton beam in which each proton has a speed of

3 \times 10^{7} m / s

. The cross-sectional area of the beam is

1.50 m m^{2} .

The charge density in this beam (in

C / m^{3})

is close to

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The three central concepts in Newtonian mechanics are

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A total solar eclipse is observed from the earth. At the same time an observer on the moon views the earth. She is most likely to see ( $E$ denotes the earth)

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A carrot looks orange in colour because of the

β

carotene molecule in it. This means that the

β

carotene molecule absorbs light of wavelengths,

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The physics behind fusion test reactor is:

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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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Write in about

1000

words a fiction piece based on your speculation on the science and technology of the twenty-second century.

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Explain the role of science in the entertainment Industry?

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Explain how physics is related to technology?

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Represent the union of two sets by Venn diagram for each of the following.

$X = {x | x$ is a prime number between $80$ and $100}$

$Y = {y | y$ is an odd number between $90$ and $100}$

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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 obscurant is 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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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?

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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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What is science?

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Text books on science may give you a wrong impression that studying science is dry and all too serious and that scientists are absent-minded introverts who never laugh or grin. This image of science and scientists is patently false. Scientists, like any other group of humans, have their share of humorists, and many have led their lives with a great sense of fun and adventure, even as they seriously pursued their scientific work. Two great physicists of this genre are Gamow and Feynman. You will enjoy reading their books listed in the Bibliography.

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“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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“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 which strike you as beautiful.

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Though India 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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“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.

What are the two principal thrusts in physics?

Important Questions on Physical World

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