by Sunday | Oct 8 | NABTEB QUESTIONS
Action of the Rear reflector on a Bicycle. The rear reflector of a bicycle is made up of red coloured glass or plastic. The surface is rough so that when light is shone on it, the beam is scattered in all directions (diffuse reflection). Since the colour is read, the...
by Sunday | Oct 8 | NABTEB QUESTIONS
Application of total internal reflection: i. Fibre optics ii. Totally reflecting Prisms iii. Prism image inverter or used in projection lantern iv. Prism Binoculars v. Prism periscope vi. Camera view finder
by Sunday | Oct 8 | NABTEB QUESTIONS
Use of Bimetallic Strip: i. Electric fire alarm ii. Gas oven thermostat iii. Electric iron thermostat iv. Balance wheel of a clock v. Thermometer
by Sunday | Oct 8 | NABTEB QUESTIONS
A ship made of steel floats on water because the overall density of the structure, that is the mass divided by the volume is less than that of water, whereas the density of steel (elemental iron mixed with carbon) is much greater than that of water. It will sink into...
by Sunday | Oct 8 | NABTEB QUESTIONS
Equipment that use vacuum tube in the homes: 1. Television 2. Rectifiers 3. Amplifiers 4. Radio 5. Computer Monitor [Items 2 to 4 have been completely transistorized nowadays that they may not be seen again in the form of vacuum tube devices in the...
by Sunday | Oct 8 | NABTEB QUESTIONS
Solid State Devices Vacuum tube devices Light and portable Heavy and bulky Do not produce too much heat nor noise Produce lots of heat and noise Can be cheaper to make Expensive to make. Do not require heating elements Requires heating elements Can operate with dry...
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