According to Article 50 of the Constitution, what subject is not mentioned under Directive Principles? 

Original cost of property minus depreciation is 

If 25:52::49:? 

Pick up the incorrect statement from the following:

What refers to the present worth of cost associated with an asset for an infinite period of time? 

Spalling hammer is used for 

Lime stone is not a 

Pick up the correct statement from the following: