The quantum numbers +1/2 and -1/2 for the electron spin represent,(a) Rotation of the electron in clockwise and anticlockwise direction respectively(b) Rotation of the electron in anticlockwise and clockwise direction respectively(c) Magnetic moment of the electron pointing up and down respectively (d) Two quantum mechanical spin states which have no classical analogues.

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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