Positive charge is carried by

1

(a)

X-rays

(b)

cathode rays

(c)

\(\gamma\)-rays

(d)

anode rays

Outermost shell of an atom cannot accommodate more electrons than

1

(a)

2

(b)

8

(c)

18

(d)

16

According to Rutherford, the force of attraction between the moving electrons and ............. is counter balanced by the centrifugal force of electrons.

1

(a)

nucleus

The nucleus of an atom consists of ..... and .........

1

(a)

protons and neutrons

What are canal rays?

1

(a)

If an atom contains one electron and one proton, will it carry any charge or not?

1

(a)

What is a discharge tube?

2

(a)

Comment on the statement: "Electron are constituent of all matter".

2

(a)

Describe the essential properties of the atomic nucleus.Compare these with the properties of the electron.

2

(a)

State the suggestions made by Bohr and Bury with regard to distribution of electrons in different energy levels in the atoms of element.

3

(a)

Define the term "Half-life".

3

(a)

Summarise the rules for writing of distribution of electrons in various shells for the first eighteen elements.

3

(a)

What are important properties of cathode rays?

4

(a)

Give four characteristics of cathode rays

4

(a)