JEE Main & Advanced Physics Communication System / संचार तंत्र Question Bank

done Assertion and Reason Total Questions - 12

• question_answer1)
  Assertion             :       Diode lasers are used as optical sources in optical communication. Reason                 :       Diode lasers consume less energy. [AIIMS 2005]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
  If assertion is false but reason is true. done clear
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• question_answer2)
  Assertion             :       Television signals are received through sky-wave propagation. Reason                 :       The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.             [AIIMS 2005]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
  If assertion is false but reason is true. done clear
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• question_answer3)
  Assertion             :       In high latitude one sees colourful curtains of light hanging down from high altitudes. Reason                 :   The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.                    [AIIMS 2003]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
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• question_answer4)
  Assertion             :       Short wave bands are used for transmission of radio waves to a large distance. Reason                 :       Short waves are reflected by ionosphere   [AIIMS 1994]
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer5)
  Assertion             :       The electrical conductivity of earth's atmosphere decreases with altitude.  Reason                 :       The high energy particles (i.e. g-rays and cosmic rays) coming from outer space and entering our earth's atmosphere cause ionisation of the atoms of the gases present there and the pressure of gases decreases with increase in altitude.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer6)
  Assertion             :       The electromagnetic waves of shorter wavelength can travel longer distances on earth's surface than those of longer wavelengths. Reason                 :       Shorter the wavelength, the larger is the velocity of wave propagation.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer7)
  Assertion             :       The surface wave propagation is used for medium wave band and for television broadcasting. Reason                 :       The surface waves travel directly from transmitting antenna to receiver antenna through atmosphere.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer8)
  Assertion             :       The television broadcasting becomes weaker with increasing distance. Reason                 :       The power transmitted from TV transmitter varies inversely as the distance of the receiver
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer9)
  Assertion             :       Microwave propagation is better than the sky wave propagation. Reason                 :       Microwaves have frequencies 100 to 300 GHz, which have very good directional properties.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer10)
  Assertion             :       Satellite is an ideal platform for remote sensing. Reason                 :       Satellite in polar orbit can provide global coverage or continuous coverage of the fixed area in geostationary configuration.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer11)
  Assertion             :       Fax is a modulating and demodulating device. Reason                 :       It is necessary for exact reproduction of a document.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow

• question_answer12)
  Assertion             :       A dish antenna is highly directional. Reason                 :       This is because a dipole antenna is omni directional.
  A)
              If both assertion and reason are true and the reason is the correct explanation of the assertion. done clear
  B)
              If both assertion and reason are true but reason is not the correct explanation of the assertion. done clear
  C)
              If assertion is true but reason is false. done clear
  D)
              If the assertion and reason both are false. done clear
  E)
              If assertion is false but reason is true. done clear
  View Solution play_arrow