1
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
The energy is always conserved for a system which is 
1
isolated only 
2
non-isolated only 
3
both isolated and non-isolated 
4
none of above 
2
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Suppose, a ball of mass M is thrown upwards from a point A and it reaches up to the highest point B and returns back to point A, which one among the following is correct ? 
1
Kinetic Energy at A = Potential Energy at B 
2
Kinetic Energy at A = Potential Energy at A 
3
Kinetic Energy at B = Potential Energy at B
4
Kinetic Energy at B = Kinetic Energy at A 
3
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
The reaction that occurs on passing carbon dioxide gas through lime water is  
1
CaCO3 + H2O + CO2 → Ca(HCO3)2 
2
Ca(OH)2 + CO2 → CaCO3 + H2O
3
CaO + CO2 → CaCO3
4
CaCl2 + H2O + CO2 → CaCO3 + 2HCl
4
NDA General Ability 14th September 2025
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements is NOT correct ? 
1
Water of crystallization is the fixed number of water molecules present in one formula unit of a salt  
2
The molecular formula of Plaster of Paris is CaSO4:2H2
3
Washing soda is used for removing the permanent hardness of water 
4
The atmosphere of Venus is made up of thick white and yellow clouds of sulphuric acid