Exam questions on cathode rays

Exam questions on Cathode rays are an important topic in physics and chemistry. They test knowledge on key curriculum areas that includes:

• Atomic Structure
• Electricity and Magnetism
• Properties of Matter
• Electron beams
• Charge-to-mass ratio (e/m)
• Millikan’s oil drop experiment
• etc.

below are questions commonly tested in physics examinations on this topic;

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1. The figure 1 below represents a cathode ray oscilloscope (C.R.O)
(i) Name the parts labeled A and B (2 marks)

A.…….…………………………………………………………………………………………
B.…….………………………………………………………………………………………….
ii) What are the functions of parts labeled C and D (2 marks)
C …………………………………………………………………………………………………
D ………………………………………………………………………………………………….
iii) Explain how electrons are produced. (1 mark)
……………………………………………………………………………………………………
…………………………………………………………………………………………………….
iv) Give a reason why the tube is evacuated. (1 mark)

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2. State the function of the grid in a cathode ray tube (CRT)                                    (1 mark)

3. State two reasons why the CRO  is a more accurate voltmeter than a moving coil voltmeter. (1 mark)

4. Figure 2 shows a cathode ray entering into a region between two charged plates.

Complete the diagram to show the path of the ray in the electric field. (1 Mark)

Related topics

• heat transfer
• Electromagnetic waves