HARD
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Who was the Prime Minister of India during the Kargil War in 1999?

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Important Questions on Molecular Basis of Inheritance

HARD
Explain the principle and working of a nuclear reactor with the help of a labelled diagram.
EASY
The ratio of mass densities of nuclei of  40Ca and 16O is close to:
MEDIUM
A 2 MeV neutron is emitted in a fission reactor. If it looses half of its kinetic energy in each collision with a moderator atom, how many collisions must it undergo to achieve thermal energy of 0.039 eV ?
EASY

Match List (Experiment performed) with List - II (Phenomena discovered/associated)and select the correct option from the options given below the lists :

  List - I   List - II
(a) Davisson and germer experiment (i) Wave nature of electrons 
(b) Millikan's oil drop experiment (ii) Charge of an electron 
(c) Rutherford experiment  (iii) Quantisation of energy levels
(d) Franck - Hertz experiment (iv) Existence of nucleus
EASY
If the nucleus Al1327 has a nuclear radius of about 3.6 fm, then Te52125 would have its radius approximately equal to,
EASY

Which of the following pairs represents isotones ?

EASY
The number of radioactive isotope of Hydrogen and total number of isotopes of Hydrogen are:
EASY
Nucleus of an atom consists of protons and electrons.
EASY

1124Na and 1224Mg are related to each other as

EASY
Which of the following pairs of nuclei are isotones?
EASY

Which of the following pairs represents isobars?

MEDIUM
Rutherford's experiment, which established the nuclear model of the atom. In this experiment, Rutherford used a beam of:
EASY
The difference between 235U and 238U atom is that
EASY
A nucleus represented by the symbol Z A X  has