Now thermionic valves are completely replaced by'? ?->(Show Answer!)

1. Now thermionic valves are completely replaced by'?

Answer: Transistors

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MCQ->Assertion (A): At a temperature of 1000 K, thermionic emission current is about 0.1 A/cm2 of surface.Reason (R): Thermionic emission current is given by Ith = SA0 T2 e-Ew/kT.

MCQ->Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.Reason (R): Thermionic emission current ∝ T2 e-Ew/kT.

MCQ->A vessel contains 10 litres of milk. First, 2 litre of the content are removed and replaced by 2 litres of water. Subsequently, 4 litres ofvessel's contents is removed and replaced by 4 litres of water. Finally, 6 litres of vessel's contents is removed and replaced by 6 litres ofwater. What is the quantity of milk left in the vessel?...

MCQ->A vessel contains 10 litres of milk.First,2 litres of the content are removed and replaced by 2 litres of water.Subsequently,4 litres of Vessel’s contents is removed and replaced by litres of water.Finally,6 litres of vessel’s contents is removed and replaced by 6 litres water.What is the quantity of milk left in the vessel?...

MCQ->Renu Bala deposits Rs 1200 now, Rs 800 two years from now and Rs 1000 five years from now. If the savings bank's rate of interest in 5%, she will receive an amount of Rs X 10 years from now, where X is...

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