General Science Class 9 MCQS

The Empirical formula of hydrogen peroxide is :

1. H2O2
2. HO
3. OH
4. O2H2

A piece of matter in pure form is termed as :

1. Redical
2. Mixture
3. Compound
4. Substance

In an atom number of protons and neutrons are added to obtain :

1. Number of electrons
2. Number of nucleons
3. Atomic number of element
4. Number of isotopes

If proton number is 19, electron configuration will be :

1. 2, 8, 9
2. 2, 8, 8, 1
3. 2, 8, 1
4. 2, 8, 3

If nucleon number of potassium is 39, number of neutrons will be :

1. 39
2. 19
3. 20
4. 29

The isotope C-12 is present in abundance of :

1. 96.9%
2. 97.6%
3. 98.8%
4. 99.7%

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