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Physics Test 101

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Physics Test 101
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2 : 1. The ratio of their nuclear sizes will be :

    Solution

     

  • Question 2
    4 / -1

    A certain radioactive substance has a half life of 5 years. Thus, for a nucleus in a sample of the element, the probability of decay in 10 years.

    Solution

    In two half lives, the material that remains undecayed is 1/4 th = 25%, Hence % of decayed material = 75%.

     

  • Question 3
    4 / -1

    The activity of a radioactive element decreased to one third of the original activity I0 in a period of nine years. After a further lapse of nine years its activity will be :-

    Solution

     

  • Question 4
    4 / -1

    There are three lumps of a given radioactive substance. Their activity is in the ratio 1 : 2 : 3 now. What will be the ratio of their activities at any further date?

    Solution

    A = Nλ (activity is independent of time)

     

  • Question 5
    4 / -1

    The radioactivity of a certain material drops to 1/16 th of the initial value in 2 hr. The half life of this radio-nuclide is :

    Solution

     

  • Question 6
    4 / -1

    The momentum of photon of energy 3MeV in kg m/s, will be -

    Solution

     

  • Question 7
    4 / -1

    Monochromatic light of frequency 6 × 1014 Hz is produced by a laser. The power emitted is 42.6 mW. The number of photons emitted, on the average, by the source per second is -

    Solution

     

  • Question 8
    4 / -1

    In photoemission, if intensity of radiation falling over surface is very low, then

    Solution

    In Einstein's explanation, the basic elementary process involved in photo electric effect is the absorption of light quantum by an electron. This process is instantaneous. Thus, whatever may be the intensity.

     

  • Question 9
    4 / -1

    Initial number of nuclei of a radioactive substance is 8 × 1015 and half life is 20 days. Then number of nuclei decayed in 60 days will be -

    Solution

     

  • Question 10
    4 / -1

    If half life of a radioactive isotope X is 30 years. It decays to another element Y which is stable. The two elements X and Y were found to be in the ratio of 1 : 3 in a sample of a given rock. The age of the rock was estimated to be -

    Solution

     

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