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This question has statement - 1 and stat...

This question has statement - 1 and statement -2.Of the four choicesgiven after the statements,choose the one that best describes the two statements.
Statement-1:Sky wave signals are used for long distance radio communication.These signals are ,in general ,less stable than ground wave signals.
Statement - 2:The state of ionosphere varies from hour to hour ,day to day and season to season.

A

Statement 1 is true ,Statement - 2 is false.

B

Statemetn - 1 is true ,Statement -2 is true,Statement - 2 is the correct explanation of Statement -1.

C

Statement -1 is true,Statement - 2 is true,Statement- 2 is not the correct explanaion of statement -1.

D

Statement-1 is false,Statement - 2 is true.

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MODERN PUBLICATION-UNIT TEST-05-EXERCISE
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  2. Infrared radiation are detected by:

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  3. This question has statement - 1 and statement -2.Of the four choicesgi...

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  4. An electromagnetic radiation of frequency v ,wave-length gamma,travell...

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  5. If epsilon0 and mu0 are the electric permittivity and magnetic permeab...

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  6. If epsilon0 and mu0 are the electric permittivity and magnetic permeab...

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  7. The electric and magnetic fields in an electromagnetic wave are

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  8. Electromagnetic waves Electromagnetic waves are those waves in which t...

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  9. The electric and magnetic fields associated with an electromagnetic wa...

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  10. Which of the following statements is false for the properties of elect...

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  11. The oscillating electric field of an electromagnetic wave is given by ...

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  12. The electric field of a plane electromagnetic wave in vaccum is repres...

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  13. Which of the following are not electromagnetic waves?

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  14. Which of the following has minimum wavelength

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  15. Arrange the given electromagnetic radiations in the descending order o...

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  16. The frequency of gamma-rays,X-rays and ultraviolet rays are a,b and c ...

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  17. According to Maxwell's hypothesis, a changing electric field gives ris...

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  18. Velocity of light is equal to

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  19. The velocity of electromagnetic waves in free space is 3 xx 10^8 m s^(...

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  20. Deduce an expression for the frequency of revolution of a charged part...

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