Television signals on earth cannot be received at distances greater than 100 km from the transmission station. The reason behind this is thatA. the receiver antenna is unable to detect the signal at a distance greater than 100 kmB. the TV programme consists of both audio and video signalsC. the TV signals are less powerful than radio signalsD. the surface of earth is curved like a sphere

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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