Goldstein's Discovery of Protons

Q.

Cathode rays are ___charged particles.

Q. Anode rays are deflected by _________ .

1. electric field
2. magnetic field
3. both electric and magnetic field
4. neither electric field nor magnetic field

Q.

An electron has a:

1. Negligible mass

2. Charge is opposite and equal to a proton

3. Relative charge of -1

4. All of these

Q. Explain how anode rays are produced in a discharge tube.

Q.

What are the essential conditions for the production of anode rays?

Q. Goldstein observed that the anode rays travel in a direction which is ________ to that of cathode rays.

1. parallel
2. perpendicular
3. opposite
4. same direction

Q.

Deflection of anode rays is maximum when the discharge tube is filled with hydrogen gas.

1. True

2. False

Q.

After the discovery of protons, the first postulate of Dalton was contradicted.

1. True

2. False

Q.

When the pressure of a gas in a discharge tube is reduced from 5 mm to 0.05 mm of Mercury the anode glow:

1. becomes smaller

2. become bigger

3. becomes smaller and breaks into smaller diselets

4. does not change

Q.

The charge on one proton is taken as unit ________ charge.

Q.

The colour of anode glow is ______________when filled with carbon dioxide at a pressure of 5 mm of Mercury.

1. deep red

2. blue

3. green

4. white

Q.

The nucleus of an iron atom is surrounded by negatively charged particles called protons.

1. True

2. False

Q.

Atoms are building blocks of matter and neutral in character.Elaborate this line.

Q. Goldstein observed that the deflection of anode rays in an electric field was ________ when compared to the deflection of cathode rays.

1. huge
2. 100 times bigger
3. equal
4. very small

Q.

Goldstein used a modified type of discharge tube with a perforated cathode. He observed that certain rays travel in a direction opposite to that of the cathode rays. These rays are called ________ .

1. anode rays
2. alpha rays
3. beta rays
4. gamma rays

Q. The relative charge of the proton is .

1. -1
2. 1
3. \N
4. 2