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Statemet-1: the electrical conductivity ...

Statemet-1: the electrical conductivity of earth's atmosphere increases with altitude.
Statement -2: The high energy particles (i.e., `gamma`- rays and cosmic rays) coming from outer space while entering our earth's atmosphere cause ionization of the atoms of the gases present in the atmosphere and their energy decreases as they approach to earth.

A

Statetment-I is True, Statement-II is True , Statement-II is a correct explanation for Statement-I

B

Statement-I is True, Statement-II is True , Statement-II is NOT a correct explanation for Statement-I

C

Statement-I is True, Statement-II is False

D

Statement-I is False, Statement-II is True

Text Solution

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The correct Answer is:
A
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A: The electrical. Conductivity of the Earth's atmosphere does not change with altitude. R : Cosmic rays from outer space entering the earth's atmosphere do not affect it.

In cosmic rays 0.15 protons cm^(-2) s^(-1) are entering the Earth's atmosphere . If the radius of the Earth is 6400 km, the current received by the Earth in the form of cosmic rays is nearly.

Which hypothesis on the origin of life states thjat the proteins, lipids and other complex organic molecules are formed when energy from the sun and other sources causes chemical reactions among gases in earth's prehistoric atmosphere?

Answer the following: (a) The top of the atmosphere is at about 400 kV with respect to the surface of the earth, corresponding to an electric field that decreases with altitude. Near the surface of the earth, the field is about 100 Vm^(-1) . Why then do we not get an electric shock as we step out of our house into the open? (Assume the house to be a steel cage so there is no field inside!) (b) A man fixes outside his house one evening a two metre high insulating slab carrying on its top a large aluminium sheet of area 1m^(2) . Will he get an electric shock if he touches the metal sheet next morning? (c) The discharging current in the atmosphere due to the small conductivity of air is known to be 1800 A on an average over the globe. Why then does the atmosphere not discharge itself completely in due course and become electrically neutral? In other words, what keeps the atmosphere charged? (d) What are the forms of energy into which the electrical energy of the atmosphere is dissipated during a lightning? (Hint: The earth has an electric field of about 100 Vm^(-1) at its surface in the downward direction, corresponding to a surface charge density = 10^(-9)C m^(-2) . Due to the slight conductivity of the atmosphere up to about 50 km (beyond which it is good conductor), about + 1800 C is pumped every second into the earth as a whole. The earth, however, does not get discharged since thunderstorms and lightning occurring continually all over the globe pump an equal amount of negative charge on the earth.)

Which of the following statements concerning atmosphere of the Earth are correct? 1. In statosphere, temperature increases with altitude. 2. In mesophere, temperature decreases with altitude. 3. The lowest temperature of the atmosphere is recorded inthe upper part of mesosphere. 4. Tropopause is an isothermal zone. Select the correct answer using the code given below

ALLEN-SEMICONDUCTORS-Part-3(Exercise-3)
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  3. Statement-I : Semiconductors do not obey Ohm's law Statement-II : El...

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  4. Statement-I : Germanium is preferred over silicon for making semicondu...

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  5. Assertion : p-n junction diode can be used even at ultra high frequenc...

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  6. Statement-I : A p-n junction with reverse bias can be used as a photod...

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  7. Assertion: NAND or NOR gates are called digital building blocks. Rea...

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  8. Assertion: Two P-N junction diodes placed back to back, will work as a...

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  9. Statement-I : When base region has larger width, the collector current...

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  10. Statement-I : For faster action, n-p-n transistor is used Statement-...

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  11. Statement-I : To be used as amplifier, the transistor in the common em...

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  12. Statement-I : Many channels get allowed when transmission frequency is...

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  13. Statement-I : Optical fibres are free from electromagnetic disturbance...

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  14. Statement-I : Diode lasers are used as optical sources in optical comm...

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  15. Statement-I : Electromagnetic waves with frequencies smaller than the ...

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  16. Assertion : In optical fibre, the diameter of the core is kept small. ...

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  17. Statement-I : For the same antenna length, power radiated by short wav...

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  18. Statemet-1: the electrical conductivity of earth's atmosphere increase...

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  19. Assertion:- Optical communication system is more economical than other...

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  20. Statement-I : A communication satellite is essentially a repeater in s...

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