physics test

Jun 17th, 2015
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1. ______________________ is the process where by ____________ are released from the surface of a heated metal. 2. The properties of cathode rays (i) They travel in ________________ lines. (ii) They are fast moving ____________ and therefore can generate ________when they hit the fluorescent screen.

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4. ELECTRONICS [/25 x 100 = % ]SECTION A Structured ItemsInstruction: Answer all questions in this section.4.1 Understanding the uses of the Cathode Ray Oscilloscope (C.R.O)A student is able to :explain thermionic emission.Describe the properties of cathode rays.Describe the uses of a cathode ray oscilloscope.-- Measure potential difference using the C.R.O. -- Measure short time intervals using the C.R.O. -- Display wave forms using the C.R.O.Solve problems based on the C.R.O. display1.______________________ is the process where by ____________ are released from the surface of a heated metal.2. The properties of cathode rays(i) They travel in ________________ lines.(ii) They are fast moving ____________ and therefore can generate ________when they hit the fluorescent screen.(iii) They are deflected by _________ and ____________ fields and are _________ charged.3. The diagram shows the structure of a simple cathode ray tube.(a)Name the components labeled P, Q, R, S and T.ComponentName of the componentFunction of the componentPQRST(b) The CRO can be used to : i. display _________________ ii. measure ________________ of DC and AC supply iii. measure a _________________________4.The figure below shows a trace formed on the screen of a CRO. If the Y-gain control on the CRO is set at 0.5 V cm-1

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