Atomic And Nuclear Physics

6 Questions
  1. 1
    Consider the following statements :
    1. In a seismograph, P waves are recorded earlier than S waves.
    2. In P waves, the individual particles vibrate to and fro in the direction of wave propagation whereas in S waves, the particles vibrate up and down at right angles to the direction of wave propagation.
    Which of the statements given above is/are correct?
    UPSC CSE I - 2023
    Show answerHide answer

    Answer: C. Both 1 and 2

    View solution
  2. 2
    The known forces of nature can be divided into four classes, viz., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them, which one of the following statements is not correct?
    UPSC CSE I - 2013
    Show answerHide answer

    Answer: A. Gravity is the strongest of the four

    View solution
  3. 3

    Consider the following statements:

    In a nuclear reactor, self-sustained chain reaction is possible, because:

    1. More neutrons are released in each of the fission reactions.
    2. The neutrons immediately take part in the fission process.
    3. The fast neutrons are slowed down by graphite.
    4. Every neutron released in the fission reaction initiates further fission.

    Which of these statements are correct?

    UPSC CSE I - 2001
    Show answerHide answer

    Answer: A. 1, 2 and 3

    View solution
  4. 4

    Which one of the following is NOT radioactive?

    UPSC CSE I - 2001
    Show answerHide answer

    Answer: D. Zirconium

    View solution
  5. 5

    Cobalt-60 is commonly used in radiation therapy because it emits

    UPSC CSE I - 1999
    Show answerHide answer

    Answer: C. gamma rays

    View solution
  6. 6

    The alpha particle carries two positive charges. Its mass is very nearly equal to that of

    UPSC CSE I - 1996
    Show answerHide answer

    Answer: B. an atom of helium

    View solution