Question Text
Question 1 :
The mass of proton is_____  times the mass of an electron.
Question 4 :
State whether the given statement is true or false:<br/>Nucleons are particles present in the nucleus of an atom.
Question 6 :
Assertion: Cathode rays get deflected towards the negative plate of electric field.
Reason: Cathode rays are negatively charged.
Question 8 :
An electron in the hydrogen atom is excited from $1^{st}$ orbit to $5^{th}$ orbit. Find the change in energy of the electron in eV:
Question 9 :
If the ratio of the atoms by mass is altered then :
Question 10 :
Different samples of water were found to contain hydrogen and oxygen in the ratio of 1 : 8. This shows the law of:<br/>
Question 11 :
In a compound the ratio of the atoms or element by mass remains always same irrespective of :<br/>
Question 12 :
In a compound the ratio of the atoms or element by mass remains always same irrespective of :<br/>
Question 13 :
The % of Copper and Oxygen in samples of CuO obtained by different methods were found to be the same. This proves the law of:<br/>
Question 15 :
10.0 g of CaCO$_3$ on heating gave 4.4 g of CO$_2$ and 5.6 g of CaO. The observation is in agreement with the: