7. The incorrect statement out of the following is

(A) Iso electronic ions may be obtained form elements belonging to different periods of the periodic table

(B) Electron affinity of noble gases is zero.

(C) van der Waal’s radii of iodine is more than its covalent radius

(D) X⁻ ion is formed with more ease in fluorine than in chlorine.

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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