J.J Thomson's Discharge Tube Theory

Q.

Define cathode rays.

Q.

What are the observations made by Thomson?

Q.

Which of the following conditions is most suitable to be maintained in the discharge tube?

1. High voltage, high pressure

2. High voltage, low pressure

3. Low voltage, low pressure

4. Low voltage, high pressure

Q. A glow was observed near the anode in the cathode ray tube experiment.

1. greenish
2. reddish
3. yellowish

Q.

The e/m ratio of anode rays is not the same for all gases.

1. True
2. False

Q.

Give one property in which cathode rays and anode rays differ.

Q.

Explain the experiment conducted by J J Thomson that led to the discovery of electrons.

Q.

Who modified the cathode ray tube to generate anode rays?

Q.

Mention the characteristics of cathode rays.

Q. Which of these choices is / are example(s) of a plasma?

1. Aurora Borealis
2. Neon sign
3. Fluorescent light bulb
4. All of the above

Q.

Choose the correct option.

Anode rays contain particles now called as ____________

1. Neutrons

2. Electrons

3. Protons

4. Nucleons

Q.

Which among the following is/are the different characteristics of anode rays?

1. Anode rays consist of positively charged electrons.

2. They are deflected by electrical fields.

3. They are not deflected by magnetic fields

4. Deflection of anode rays depends upon the nature of the gas in the discharge tube.

Q.

Which among the given apparatus was not used in the production of cathode rays?

1. Discharge tube

2. Metal electrodes

3. Vacuum Pump

4. Paddle wheel

Q.

What conditions were maintained by J.J. Thomson during the production of cathode rays?

1. Low pressure, Low voltage

2. High pressure, Low voltage

3. High pressure, High voltage

4. Low pressure, High voltage

Q.

Thomson compared atom to watermelon and thus derived some conclusions. Which of the following were his conclusions?

1. The seeds are the electrons and red edible part is the positive sphere.
2. The seeds and edible part both are electrons.
3. The seeds and edible part both are positive charge.
4. The seeds are positive spheres and red edible parts are the electrons.

Q.

Which of the following are the postulates of Thomson’s model of an atom?

1. An atom consists of a positively charged sphere and electrons are embedded in it

2. An atom consists of a negatively charged sphere and neutrons are embedded in it

3. The negative and positive charges are equal in magnitude

4. An atom consists of a positively charged sphere and electrons are embedded in it, the posivite and negative charges are equal in magnitude.

Q. Who among the following proposed the plum pudding model of an atom?

1. James Chadwick
2. J.J. Thomson
3. E. Goldstein
4. Ernst Rutherford