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WorksheetsELECTRONICS PART 1
Total questions: 7
Worksheet time: 14mins
Diagram shows a trace on the screen of a cathode ray oscilloscope. Which statement is correct to explain the trace produced.
Both Y-input and time base are switch off
Y-input is connected to battery and the time base is switched off
Y-input is connected to alternating current power supply and the time base is switched off
Y-input is connected to alternating current power supply and the time base is switched on.
Diagram 2 shows the trace displayed on the screen of a cathode ray oscilloscope. Which diagram shows the correct trace when the time-based is off?
Diagram 3 below shows the main structure of a cathode ray oscilloscope. Which part of the C.R.O. focuses the flow of electrons onto the screen?
P
Q
R
S
Diagram 4 shows a Maltese cross tube which is connected to an Extra High Tension (E.H.T) power supply using switches S1 and S2. Which is observed when S2 is open?
There is no glow on the fluorescent screen
There is no green light appeared on the fluorescent screen
The cathode ray moves with higher velocity
The shadow of the Maltese cross moves downwards.
Diagram 6 shows a metal heated at high temperature. X particles escape from the surface of metal. Name the X particle and the process involved.
Particle: Neutron
Process: Bombarding
Particle: Proton
Process: Radiation
Particle: Electron
Process: Radiation
Particle: Electron
Process: Thermionic Emmision
Thermionic Emission involves
the ionization of the surrounding air by heat
the deflection of an electron beam by magnetic field
the release of electron from the surface of the heated metal
the forming of a bright spot when the electrons strike the fluorescent screen.
Which of the following statement if not correct about a cathode ray in an electron gun?
The cathode ray is negatively charged
The kinetic energy of the cathode ray converted into light when it is on the fluorescent screen
The cathode ray is positively charged
The electric fields deflect the cathode ray
