Question 1 :
Which pf the following was not explained in Rutherford's atomic model?
Question 2 :
According to J. Chadwick, __________ is not found in hydrogen atom.
Question 3 :
On the basis of Rutherford's particle scattering experiment, he stated that: 
Question 4 :
The experiment which led to the discovery of nucleus was performed by :
Question 7 :
J.J. Thomson's atomic model could not justify the shielding of electrons from positive charges.
Question 9 :
According to Rutherford, the electron revolves around the nucleus in definite orbits but :
Question 11 :
In 1911, __________ came to the conclusion that the atom had a dense nucleus because most of the particles shot straight through, but some of the particles were deflected due to the dense nucleus of the gold atoms.
Question 12 :
Isotopes of iodine _______ is used in the treatment of goiter.
Question 13 :
In Rutherford's alpha-ray scattering experiment, a screen is used to detect the alpha particles which is coated by:
Question 14 :
When an atom accepts $ 2$ electrons in its outermost shell, its valency is $+2$.
Question 16 :
Isotopes of cobalt .......... is used in the treatment of cancer.
Question 18 :
While revolving in discrete orbits the electrons do not radiate energy. These orbits or shells are called .................. 
Question 22 :
It was found that electrons have negligible mass but have one unit of negative charge. Which of the following model satisfies this statement?
Question 27 :
Radius of the nucleus is about ............. times less than the radius of the atom.<br/>
Question 28 :
The presence of nucleus in an atom is determined by Rutherford $\alpha - ray$ scattering experiment.<br/>
Question 35 :
Ratio of time of electron in first and second orbit of $H$- atom be:
Question 38 :
The oxide of nitrogen has molecular weight $30$. The total number of electrons in one molecule of the compound is :
Question 39 :
Which of the following statement is incorrect according to Thomson's model of an atom?
Question 40 :
Which of the following is not a conclusion of Rutherford experiment?
Question 41 :
The ratio of the radius of the Bohr orbit for the electron orbiting the hydrogen nucleus that of the electron orbiting the deuterium nucleus is approximately _____.
Question 42 :
An electron in energy level $n=1$ is given energy $E$ which is slightly more than energy required to excite to level $n=2$ and less than energy required to excite to level $n=3$. The electron will:
Question 43 :
Electrons can revolve round the nucleus at any radial distance from the nucleus.<br/><br/>
Question 46 :
An element has atomic number 15. Its valence electrons, group number and valency are respectively 
Question 47 :
Which of the following are features of Rutherford nuclear model of an atom?
Question 48 :
An outermost shell which has eight electrons is said to possess a/an
Question 50 :
Which of the following elements has three shells with no shells having even number of outer electrons?