PHY307
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1. Bravais lattice consists of __________ space lattices.
Eleven
Twelve
Thirteen
Fourteen
2. Which of the following theories cannot be explained by classical theory?
Electron theory
Lorentz theory
Photo-electric effect
Classical free electron theory
3. What does the conductivity of metals depend upon?
The nature of the material
Number of free electrons
Resistance of the metal
Number of electrons
4. What is the atomic packing factor of BCC structure?
0.54
0.68
0.74
0.96
5. The crystal lattice has a _________ arrangement.
One-dimensional
Two-dimensional
Three-dimensional
Four-dimensional
6. Which of the following theories can be adopted to rectify the drawbacks of classical theory?
Compton theory
Quantum theory
Band theory
Electron theory
7. The smallest portion of the lattice is known as __________
Lattice structure
Lattice point
Bravais crystal
Unit cell
8. What is the coordination number of a simple cubic structure?
6
8
10
12
9. A unit cell that contains lattice points only at the corners is known as _________
Primitive unit cell
Secondary unit cell
Layered unit cell
Derived unit cell
10. What happens to the free electrons when an electric field is applied?
They move randomly and collide with each other
They move in the direction of the field
They remain stable
They move in the direction opposite to that of the field
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