Identify the incorrect statement from the following: (1) Ozone absorbs the intense ultraviolet radiation of the sun. (2) Depletion of ozone layer is because of its chemical reactions with chlorofluoro alkanes. (3) Ozone absorbs infrared radiation. (4) Oxides of nitrogen in the atmosphere can cause the depletion of ozone layer.

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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