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BSNL JE TTA Recruitment Examination   Test Paper – I 1. When a inductive coil connected to a 200 V, 50Hz ac supply with 10A current flowing through it dissipates 1000 watts then which of the following will have least value in ohms- a.) Resistance b.)Reactance c.) Impedance d.) None 2 Oscillator crystal are made of – a.)     Silicon b.) Germanium c.) Quartz d.) None 3. For small size, high frequency coils, the most common core material is a)Air b. )Ferritec.) Powdered ion d.) Steel. 4. If we have a parallel plate capacitor of plate area 'A' and plate separatoin t and having a capacity C and a metallic plate r of area A and of negligible thickness is introduced in the capacitor at a distance from either of the two plates as shown in the given figure then the capacity of the capacitor will become – a.) b.)C c.)2C d.)4C 2. 5. A superconductor is a – a.)A material showing perfect conductivity and Meissner effect below a critical temperature b.)A conductor having zero resi...