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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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ALLEN-SEMICONDUCTORS-Part-3(Exercise-3)
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  3. A: Semiconductors do not obey Ohm's law. R: In semiconductors the ra...

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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. Assertion : A p-n junction with reverse bias can be used photo-diode t...

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  7. A: NAND or NOR gates are called digital building blocks R: The repea...

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  8. Assertion : Two p-n junction diodes placed back to back, will work as ...

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  9. Assertion: When base region has large width, the collector current inc...

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

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  11. Assertion:- To be used as amplifier, the transistor in the common emit...

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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. Assertion : A 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. A: Optical communication system is more economical than other system o...

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

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