Discovery of Electrons

Q.

What is the ratio of mass of an electron to the mass of proton ?

Q.

What is neutron

Q.

Mass of an electron is approximately 1/1837 times that of mass of proton. True or False.

1. True

2. False

Q.

The proton has a charge equal in magnitude but opposite in sign to that of:

1. Neutron

2. Deuteron

3. Canal ray

4. Electron

Q.

Mass of an electron is approximately 1/1837 times that of mass of proton.

1. True

2. False

Q.

Electrons are negatively charged. Then why are they not attracted towards nucleus and fall into it?

Q. The mass of an electron is approximately 2000 times the mass of a proton.

1. False
2. True

Q.

The weight of alpha particle is ____ amu.

Q.

Out of the three subatomic particles Known, which is called universal particle ?

Q.

The ___________ is owning up almost 99.99% of the mass of the atom, but by default it covers only ${10}^{-5}$ of the volume of the atom.

1. Neutron

2. Proton

3. Nucleus

4. Electron

Q.

Which charge is present in proton?

Q.

_____ is the charge of an electron.

1. 1

2. 0

3. -1

4. 2

Q.

$\mathrm{\beta }$-rays comprise electrons and are very light.

1. True
2. False

Q.

The mass of an electron is negligible when compared to a proton.

1. False

2. True

Q. According to J.J Thomson's atomic model, an atom consists of a charged sphere and are embedded in it.

1. positively
2. negatively
3. electrons
4. protons

Q.

The mass of an electron is 1/1837 times that of a proton

1. True
2. False

Q.

The mass of a proton is _____ times the mass of an electron.

Q. Question 1
For the symbol H, D and T tabulate three sub-atomic particles found in each of them?

Q.

Who discovered the electron?

1. John Dalton

2. James Chadwick

3. J.J. Thomson

4. Niels Bohr

Q. The plum pudding model stated that atoms are electrically neutral.

1. True
2. False

Q. Which of the following is/are subatomic particles?

1. Protons
2. Positron
3. Neutrino
4. All the above

Q.

Choose Correct options

1. J.J Thompson - Discovered Electron

2. GJ Stoney - Named Electron

3. E.Goldstein - Discovered Neutron

4. James Chadwick - Discovered Proton

Q. A certain radioactive nucleus emits a particle that leaves its mass unchanged but increases its atomic number by one. Identify the particle and write its symbol.

Q.

Who discovered the electron?

1. John Dalton

2. J.J. Thomson

3. Niels Bohr

4. James Chadwick

Q. The nucleus of tritium consist of

1. 1 proton + 1 neutron
2. 1 proton + 3 neutron
3. 1 proton + zero neutrons
4. 1 proton + 2 neutrons

Q. Which of the following conclusions did the plum pudding model fail to explain?

1. Motion of electrons in the orbits
2. Neutrality of an atom
3. Presence of negative charge
4. Nucleus of an atom

Q.

The proton has a charge equal in magnitude but opposite in sign to that of:

1. electron

2. canal rays

3. deuterons

4. neutron

Q.

What is the use of neutrons in an electric circuit?

Q. The charge on a proton is e.
What is the charge on an electron and what is the charge on a neutron?

1. electron : e ; neutron : e
2. electron : e ; neutron : 0
3. electron : -e ; neutron : -e
4. electron : -e ; neutron : 0

Q. Positive rays was discovered by

1. Thomson
2. Goldstem
3. W.Crookes
4. Rutherford