Home
Class 12
PHYSICS
A: The electrical. Conductivity of the E...

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.

A

If both Assertion & Reason are true and the reason is the correct explanation of the assertion, then mark (1)

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)

C

If assertion is true statement but Reason is false, then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC WAVES

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - C Previous Years Questions|22 Videos
  • ELECTROMAGNETIC INDUCTION

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT(SECTION -D) Assertion-Reason type Question)|15 Videos
  • ELECTROSTATIC POTENTIAL AND CAPACITANCE

    AAKASH INSTITUTE ENGLISH|Exercise ASSIGNMENT SECTION - D|9 Videos

Similar Questions

Explore conceptually related problems

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.

How does atmospheric pressure change with the change in altitude?

How does atmospheric pressure change with altitude ? Draw an approximate graph to show this variation .

What will be the colour of sky as seen from the earth, if there were no atmosphere

Which organisms changed earth's atmosphere from reducing to oxidising?

"Hydrogen escapes from the earth's atmosphere more readily than oxygen " why?

If the electric field intensity in a fair weather atmosphere is 100 V/m, then total charge on the earth's surface is (radius of the earth is 6400 km)

When sunlight enters the earth's atmosphere, state which colour of light is scattered (i) the most, and (ii) the least.

The density of the atmosphere at sea level is 1.29 kg//m^(3) . Assume that it does not change with altitude, how high should the atmosphere extend?

The theory that living organisms on the earth came from outer space is based on the study of

AAKASH INSTITUTE ENGLISH-ELECTROMAGNETIC WAVES-ASSIGNMENT SECTION - D Assertion-Reason Type Questions
  1. A : Long distance radio broadcasts use short-wave bands. R : Ionosp...

    Text Solution

    |

  2. A : It is necessary to use satellites for long distance TV transmissi...

    Text Solution

    |

  3. A : Optical and radio telescopes are built on the ground but X-ray ...

    Text Solution

    |

  4. A : If the earth did not have an atmosphere, its average surface temp...

    Text Solution

    |

  5. A : It has been predicted that a global nuclear war on the earth would...

    Text Solution

    |

  6. A : In an EM wave the magnitude of the electric field vector is more ...

    Text Solution

    |

  7. A : The displacement current goes through the gap between the plates...

    Text Solution

    |

  8. As the frequency of an ac circuit increases, the current first increas...

    Text Solution

    |

  9. A : When cooking in microwave ovens, metal containers are used. R :...

    Text Solution

    |

  10. A : Food is cooked faster by microwaves than by conventional gas burne...

    Text Solution

    |

  11. A : Microwaves are commonly used in radar to locate flying objects. ...

    Text Solution

    |

  12. A : Environmental damage has depleted the ozone layer in the atmosphe...

    Text Solution

    |

  13. A: The electrical. Conductivity of the Earth's atmosphere does not cha...

    Text Solution

    |

  14. A : Static crashes are heard on a radio when a lightening flash occurs...

    Text Solution

    |

  15. A : TV signals are affected if a low flying aircraft passes by or a p...

    Text Solution

    |

  16. A : Light waves can be polarised. R : All electromagnetic waves move...

    Text Solution

    |

  17. A : In an electromagnetic wave the energy density in electric field ...

    Text Solution

    |

  18. A : The poynting vector given as bar(S) = (bar(E ) xx bar( B))/(mu0) r...

    Text Solution

    |

  19. A : The radiation pressure due to light waves is maximum when the sur...

    Text Solution

    |

  20. A : In a material medium the speed of a particle can be more than the ...

    Text Solution

    |