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Upto…………… litres of water may be collect...

Upto…………… litres of water may be collected from a large in a single storm in Uganda and srilanka.

A

India

B

USA

C

Sri Lanka

D

Germany

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The only electron in the hydrogen atom resides under ordinary conditions on the first orbit. When energy is supplied, the electron moves to higher energy orbit depending on the amount of energy absorbed. When this electron returns to any of the lower orbits, it emits energy. Lyman series is formed when the electron returns to the lowest orbit while Balmer series is formed when the electron returns to second orbit. Similarly, Paschen, Brackett and Pfund series are formed when electron returns to the third, fourth orbits from higher energy orbits respectively (as shown in figure) Maximum number of lines produced when an electron jumps from nth level to ground level is equal to (n(n-1))/(2) . For example, in the case of n = 4, number of lines produced is 6. (4 rarr 3, 4 rarr 2, 4 rarr 1, 3 rarr 2, 3 rarr 1, 2 rarr 1) . When an electron returns from n_(2) to n_(1) state, the number of lines in the spectrum will be equal to ((n_(2) - n_(1))(n_(2)-n_(1) +1))/(2) If the electron comes back from energy level having energy E_(2) to energy level having energy E_(2) then the difference may be expressed in terms of energy of photon as E_(2) - E_(1) = Delta E, lambda = (h c)/(Delta E) . Since h and c are constant, Delta E corresponds to definite energy, thus each transition from one energy level to another will prouce a higher of definite wavelength. THis is actually observed as a line in the spectrum of hydrogen atom. Wave number of the line is given by the formula bar(v) = RZ^(2)((1)/(n_(1)^(2)) - (1)/(n_(2)^(2))) Where R is a Rydberg constant (R = 1.1 xx 10^(7)) (i) First line of a series : it is called .line of logest wavelength. or .line of shortest energy.. (ii) Series limit of last of a series : It is the line of shortest wavelength or line of highest energy. In a single isolated atom in electron makes transition from 5^(th) excited state to 2^(nd) state the maximum number of different types of photons observed as

NCERT TELUGU-OBJECTIVE TYPE QUESTION-ENVIRONMENTAL EDUCATION
  1. This is prohibited in zoos-

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  2. Read the following sentences. (A) People regard nature as divine., (B)...

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  3. Which of the following is not a biodegradable substance?

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  4. Which of the following is an eco friendly act (A) Dumping biodegradabl...

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  5. Garbage dumps infested by flies lead to spread of ………………..

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  6. If al the waste we generate is biodegradable, what impact may this hav...

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  7. Complete the blanks. The entering of pollutants in a food chain is c...

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  8. The purest sample of water, is

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  9. Discharge of sewage water into water bodies hazardous to people partic...

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  10. Fill in the blank. (3) Development is necessary, but it should be ……...

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  11. Write some common measures to be taken to prevent transmission of dise...

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  12. Find out the one which is not the environmental movement-

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  13. The electricity produced from dam is-

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  14. Fill in the blank (1) Natural disaster are phenomena that are beyond...

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  15. Fill in the blank (1) Education is the ……………………of every child.

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  16. Prepare model for rain water harvesting or energy saving or soil manag...

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  17. Fill in the blank (2) It is our duty to make sure that ……………………gets ...

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  18. …………………….. is the alternative method to prevent ground water depletion...

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  19. Upto…………… litres of water may be collected from a large in a single st...

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  20. Scheele explained about fluorine in the year-

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