GRADE 7 BASIC TECHNOLOGY 3RD TERM MID TERM TEST 2022/2023 T

The displacement of electrons from the surface of a metal is called

• Proton emission

• Electronic emission

• Atomic emission

•    Molecular emission

Which of the following is not a principal method of electronic emission?

• Thermionic

• Photo

• Cold cathode

• Nuclear

The method by which free electrons are emitted from the surface of metal by the application of magnetic fields or electric field is

• Cold cathode emission

• Photo electric emission

•   Thermionic emission

•     Secondary emission

  Substances whose electrically conductivity lies between the good conductors are called_____

• Diodes

• Conductors

• Insulators

•    Semi-conductors

Which of the following is an example of a semi-conductor?

• Germanium

• Copper

• Aluminum

• Bar magnet

Devices that opposes the flow of electric current in an electrical circuit is called ____

• Resistance

• Resistors

• Semi-conductors

• Capacitor   

   The ability of a resistor to control or oppose the flow of electric current is _____

•  Resistance

• Resistors

• Semi-conductors

• Capacitor   

A device or a piece of apparatus that stores electric charges in form of electric energy is

• Resistor

• Circuit

• Fuse

•    Capacitor

Which of the following is not a terminal in a transistor?

• The Emitter(E)

• The Base(B)

• The Collector(C)

•   Apex

  The electrical device below converts chemical and kinetic  energy to _____ energy

 

     

• Solar

• Gravitational

• Electrical

•      Potential