A. vacuum tubes
B. copper conductors
C. ferrite cores
D. transistors
Related Mcqs:
- The photo-electric effect occurs only when the incident light has more than a certain critical____________?
A. intensity
B. speed
C. frequency
D. wave length - is a negatively charged particle present in an atom______________?
A. Proton
B. Neutron
C. Electron
D. None of the above - Superconductors are becoming popular for use in________________?
A. generating very strong magnetic field
B. manufacture of bubble memories
C. generating electrostatic field
D. generating regions free from magnetic field - Overhead telephone wires are made of_____________?
A. aluminium
B. steel
C. ACSR conductors
D. copper - Most of the common metals have _________ structure?
A. linear
B. hexagonal
C. orthorhombic
D. cubic - In graphite, bonding is____________?
A. covalent
B. metallic
C. Vander Waals
D. Vander Waals and covalent - Steel wire is used as____________?
A. overhead telephone wire
B. earth wire
C. core wire of ACSR
D. all of the above - Copper, even though costly, finds use in the windings of electrical machines because_____________?
A. copper points offer low contact resistance
B. copper can be easily soldered and welded
E. copper windings are less bulky and the machines become compact
D. all of the above - The forbidden gap in an insulator is________________?
A. large
B. small
C. nil
D. any of the above - Selenium is __________ semiconductor?
A. extrnisic
B. intmisic
C. N-type
D. P-type
