PH6151 PHY1 Important Questions, Engineering Physics 1 Answer Key – IT 1st SEM Anna University


Anna University Regulation 2013 Information Technology (IT) PH6151 PHY1 Important Questions for all 5 units are provided below. Download link for IT 1st SEM PH6151 Engineering Physics 1 Answer Key is listed down for students to make perfect utilization and score maximum marks with our study materials.



1. What is meant by Unit cell?

It is the smallest geometrical structure of a solid from which the entire crystal structure can be constructed by repetition in three-dimension.

2. What are the Lattice parameters for a unit cell?

The intercepts on the axes a, b and c and interfacial angles α, β and γ are called lattice parameters of a unit cell.

3. Name the seven Crystal Systems.

a) Cubic

b) Tetragonal

c) Orthorhombic

d) Monoclinic

e) Triclinic

f) Rhombohedral

g) Hexagonal

4. What are Bravias Lattices?

There are only 14 ways of arranging points in space such that the environment looks same from each point. i.e., there are 14 possible types of space lattices out of the seven crystal systems. These 14 space lattices are called as Bravais lattices.

5. Define Co-ordination number.

It is the number of nearest neighbor atoms that an atom has in the given crystal structure.

6. Write the uses of Graphite?

  • It is used as a lubricant in lathe, air compressors, railway truck- joints open gears, cast iron bearings, general machine shop works.
  • When the graphite is mixed with the oil it is called oil dag which is used in internal combustion engines.
  • When the graphite is mixed with the water it is called aqua dag which is used as an oil free lubricant in food stuff industries.

7. Classify the crystal growth techniques.

The various crystal growth techniques are

Solution growth

Melt growth

Vapour growth

8. Name the two important Melt growth techniques.

The two important melt growth techniques are

Czochralski technique

Bridgman technique

9. Write a short note on Crystal growth from melt.

Melt growth is the process of crystallization by fusion and resolidification of the starting materials.

10. What are the advantages of Czochralski method?

Growth from free surface

Growth of large oriented single crystals

Convenient chemical composition

Control of atmosphere

11. What are the limitations of Bridgman Technique?

Confinement of crystals

Crystal perfection is not better than that of the seed

No visibility

12. What are the advantages and disadvantages of Vapour Phase Epitaxy?


  • Halogen based VPE produces high pure single crystal layers with limited defects.
  • Hyride based VPE allows proper control over the ratio of group III to group V vapor phase species.


  • Higher growth temperatures results in higher impurity diffusion. So uniform distribution of impurities cannot be obtained.

13. A unit cell has the dimensions a=b=c = 4.74 Å and α=β=γ=60°.What is its crystal structure.

The unit cell is Trigonal or Rhombohedral.

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