Cathode ray tube

The diagram shows a cathode ray tube. Name the parts of cathode ray tube: 1-..............................and

2- .......................................... (write the answer in the singular)

The diagram shows a cathode ray tube. Name the parts of cathode ray tube: 3-................... ............and

4- .......................................... (write the answer in the singular.) .

The diagram shows a cathode ray tube. What is shown at number 5-.............................. .............................

Cathode rays are streams of ................................ observed in vacuum tubes

The operation of CRT is based on ............................... ............................... .

Which of the following is not true for the cathode rays?

• They are deflected by magnetic field.

• They are positively charged.

• They cause mechanical motion.

• They produce heating effect.

• They travel in stright lines.

At room temperature, the electron cannot escape metal surface due to

• attractive forces of nucleus

• repulsive forces of electrons

• repulsive forces of nucleus

• pulling force of protons

If an electric field is put across the beam with the positive plate on top and the negative plate below.

The beam will bend ...............

• right

• left

• up

• down

Why is a vacuum needed in the tube?

• 
  It makes the process more efficient.

• It impedes or slows down the electrons.

• 
  

  It allows the electrons to flow unimpeded.

• 
  

  It allows the electrons to be made into a beam.

How is the electron beam detected?

• 
  

  Using an electron microscope.

• 
  

  By deflecting the beam of electrons with an electric field.

• By deflecting the beam of electrons with a magnetic field.

• 
  Use of a fluorescent screen.