by Sunday | Oct 8 | NABTEB QUESTIONS
Bugging devices are devices for keeping surveillance of a place, such that conversation there can be monitored. People coming in and out can be monitored as well. Merits Demerits Helps to keep security surveillance Encroaches on people Liberty/rights Helps to prevent...
by Sunday | Oct 8 | NABTEB QUESTIONS
It is wrong to call a transistor radio just a transistor because it comprises many elements, like transistors, diodes, transformer, resistors, inductors and capacitances.
by Sunday | Oct 8 | NABTEB QUESTIONS
Peaceful uses of nuclear reaction: 1. Medical field for radiotherapy: This uses radioisotopes which are by-products of fission reactions. After injection into the body their movement through the body organs are monitored. 2. Radioisotopes are used in agriculture as...
by Sunday | Oct 8 | NABTEB QUESTIONS
Three instruments for detecting radiation from radioactive substances: – 1. Geiger – Muller tube/rate meter/Dekatron counter. 2. Ionization chamber 3. Scintillation counter 4. The cloud chamber 5. Solid-state detectors (reversed based semi conductor diode). 6....
by Sunday | Oct 8 | NABTEB QUESTIONS
Differences between the magnetic properties of steel and soft iron. Soft iron Steel Easily magnetized Not easily demagnetized Demagnetized Magnetized Have low coercive force Have large coercive force Have high permeability Low permeability Highly purified,...
by Sunday | Oct 8 | NABTEB QUESTIONS
The lines of force of a magnetic field do not cross because the line of force is the line along which a free N pole would tend to move if placed in the field or it is a line such that a tangent to it at any point gives the direction of the field at that point....
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