The electron gun is the main part of?
(A) Cathode Ray Isoloscope
(B) Transistor tester
(C) Single Generator
(D) All of the above
The most common use of electron guns is in cathode-ray tubes, which were widely used in computer and television monitors before the advent of flat screen displays. Most color cathode-ray tubes incorporate three electron guns, each one producing a different stream of electrons.
Refrigerators have a relay?
(A) Magnetic type
(B) by simple switch
(C) Non-magnetic
(D) All of the above
What is the coupling of primary and secondary coils in a transformer?
(A) Electrical
(B) Mechanical
(C) Magnetic
(D) All these
The secondary coil is also generating a magnetic field that is growing and shrinking just like the field in the primary coil. This coupling of magnetic energy between these two coils is called mutual induction.
Are secondary electrical devices?
(A) Depleting torques
(B) Containing torque
(C) Damping torque
(D) All these
In the nitrogen cycle, soil nitrates are converted into free nitrogen by whom?
(A) nitrifying bacteria
(B) denitrifying bacteria
(C) ammonifying bacteria
(D) None of these
The relationship between the water fern Azola and the cyanobacterium Annabena is: -
(A) symbiotic
(B) mutual
(C) Survival
(D) Proto-support
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