Question Text
Question 3 :
In $$\beta$$-emission from a radioactive substance, an electron is ejected from:
Question 4 :
Tick the appropriate answer.<br>Which of the following is used as a coolant in nuclear reactor ?
Question 6 :
The subatomic particle which increases or decreases in an atom during the chemical reaction is(are) ________. 
Question 8 :
The values of charge on the oil droplets experimentally observed were $$-1.6\times 10^{-19}, -2.4\times  10^{-19}$$ and $$-4\times  10^{-19}$$ coulomb. The value of the electronic charge, indicated by these results is
Question 9 :
The subatomic particle which remains unchanged during the chemical reaction is/are ________ . 
Question 10 :
The cathode rays tube experiments carried out by J.J. Thomson demonstrated that:<br/>
Question 12 :
The $$\frac{e}{m}$$ ratio of an electron for all types of substances is:<br/>
Question 14 :
The value of charge on the oil droplets experimentally observed were $$-1.6 \times 10^{-19}$$ and $$-4 \times 10^{-19}$$ coulomb. The value of the electronic charge, indicated by these results is:<br/>
Question 15 :
Effective nuclear charge ($$Z_{eff}$$) for a nucleus of an atom is defined as: