Cathode rays — KCSE Physics

KCSE Physics · 112 practice questions · 3 syllabus objectives

36 easy37 medium39 hard

What You'll Learn

Key learning outcomes for this topic, aligned to the KNEC KCSE syllabus.

Describe the production and state the properties of cathode rays

Explain the functioning of a Cathode Ray Oscilloscope and TV tube

Explain the uses of a CRO and solve problems involving CRO waveform analysis

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easySHORT ANSWER3 marks

Explain how a cathode ray oscilloscope can be used to measure the amplitude of an AC signal. (3 marks)

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Part (a) — 3 marks

Connect the AC signal to the Y-plates of the CRO (1 mk)

Adjust the vertical sensitivity to scale the signal appropriately (1 mk)

Read the maximum peak height of the waveform from the screen (1 mk)

easySHORT ANSWER2 marks

Name two applications of a cathode ray oscilloscope in electronic testing. (2 marks)

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Part (a) — 2 marks

Testing and troubleshooting electronic circuits (1 mk)

Analyzing signal waveforms in communication systems (1 mk)

easySHORT ANSWER3 marks

Explain the role of the phosphor coating in a cathode ray tube television in producing images. (3 marks)

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Part (a) — 3 marks

The phosphor coating emits light when struck by cathode rays. (1 mk)

Different phosphors produce different colours, allowing for colour images on the screen. (1 mk)

The persistence of the phosphor allows the image to remain visible for a short duration, enhancing picture quality. (1 mk)

Define how the deflection of cathode rays occurs in a cathode ray oscilloscope when subjected to electric fields. (2 marks)

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