Which causes a largest change in pH on addition to 20 ml 0.1 M acetic acid solution?
(A) Addition of distilled water
(B) Addition of 20 mol of 0.01 MCH3COOH
(C) Addition of 20 ml of 0.1 M HCl
(D) Addition of 20 ml of 0.1 M NaOH

in a physics laboratory a block x is balanced by a block Y of mass 200 kg,each are suspended from a balance of equal lever arms .the scale pan on X is at a height.H1=2 cm ,where as scale pan on Y is at height 1 cm above the floor.the error in weighing is (in gram)

consider the figure of a single riveted lap joint as follows

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cyclic heat engine operates between. temperature of 30 C. What is the least rate of heat rejection per kW net output of an engine. source temperature of 800 C and sink

 

 

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