9th Class Chemistry MCQs

Electronic configuration is distribution of:

1. Proton
2. Neutron
3. Electron
4. Positron

Which one of the following is most penetrating?

1. Electron
2. Proton
3. Alpha particle
4. Neutron

How many sub-shells in a L shell?

1. One
2. Two
3. Three
4. Four

De Broglie extend the wave particle duality to electron in:

1. 1920
2. 1922
3. 1923
4. 1925

Name the material of screen which used in Rutherford atomic model?

1. Aluminum foil
2. Zinc sulphide
3. Sodium sulphide
4. Aluminum sulphide

Which rays are used for sterilization of medical instruments?

1. α-rays
2. β-rays
3. γ-rays
4. x-rays

In 1869 Mandeleev put forward his periodic law about:

1. Atomic Number
2. Chemical properties
3. Physical properties
4. Atomic Mass

The periodic table divided into S, P, d, and f block based on:

1. Atomic Radius
2. Electronic Configuration
3. Ionization Energy
4. Electron Affinity

4th and 5th period in periodic table are known as?

1. Short period
2. Long period
3. Normal period
4. Very long period

Which one of the following decreases along the period?

1. Ionization Energy
2. Atomic Radius
3. Electronegativity
4. Electron Affinity