49. Science for NDA / CDS / AFCAT

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49. Science for NDA / CDS / AFCAT

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1 out of 10 questions

  • Old-written material, which cannot be read easily, can be read by :

     

     

  • Mesons are found in :

     

     

  • The dark lines in the solar spectrum are due to :

     

     

  • Which of the following is/are examples of electromagnetic waves ?

    1. X-rays                2. Ultrasonics

    3. γ-rays                  4. β-rays

     

     

  • A moderator is used in nuclear reactors in order to :

     

     

  • In an atomic nucleus, neutrons and protons are held together by :

     

     

  • The wavelength of X-rays is of the order of :

     

     

  • The correct sequence of various regions in absorption spectrum is :

     

     

  • Which of the following is used as a moderator in nuclear reactor ?

     

     

  • Which of the following statements about a refrigerator is/are correct ?

    1. It converts electrical energy into heat energy.

    2. It converts electrical energy into mechanical energy.

    3. It transfers heat from a high temperature to a low temperature.

    4. It transfers heat from a low temperature to a high temperature.

     

     

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