Materials Science Practice Test 1

1. Moving down a group, which of the following properties generally diminishes?

Molar mass

Metallic character

Electronegativity

Atomic radius

2. Which of the following orbitals do not exist?

3. There are seventeen non-metals in the periodic table. Unlike metals in the same period, they have higher:

Atomic size

Atomic number

All of the mentioned

Electropositivity

4. HCP and BCC are called close-packed structures. Close packed structures have:

All of the mentioned

Highest void fraction

Highest density

Highest packing efficiency

5. Most Bravais lattices are of the type:

Face centered unit cell

Primitive unit cell

Body centered unit cell

End centered unit cell

6. Which if the following is not an SI unit?

Kilogram

Atomic Mass Unit

Coulomb

Mole

7. In which of the following Bravais lattices none of the sides are equal?

Monoclinic

Orthorhombic

Triclinic

All of the mentioned

8. Around 1911, Rutherford suggested a planetary model of atomic structure. Which of the following was not a proposition of this model?

Most of the volume in an atom is void

Mass of atom is concentrated in the nucleus

Electrons revolve in circular orbits around the nucleus

Nucleus consists of protons and neutrons

9. Number of atomic orbitals in nth shell is:

n − 1

2n + 1

n²

2n²

10. The smallest portion of a crystal which when repeated in different directions generates the entire crystal is called:

Lattice points

None of the mentioned

Crystal lattice

Unit cell