According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.

Question: In a unit cell of a body centred cubic space lattice, there are __________ atoms.
[A].

six

[B].

nine

[C].

fourteen

[D].

seventeen

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a unit cell of close packed hexagonal space lattice, there are twenty four atoms.
[A].

Correct

[B].

Incorrect

Answer: Option B

Explanation:

No answer description available for this question.

Question: In high speed steels, vanadium adds to the property of red hardness and tungsten and chromium add to high wear resistance.
[A].

True

[B].

False

Answer: Option A

Explanation:

No answer description available for this question.

Question: Closed packed hexagonal space lattice is found in
[A].

zinc, magnesium, cobalt, cadmium, antimony and bismuth

[B].

gamma-iron, aluminium, copper, lead, silver and nickel

[C].

alpha-iron, tungsten, chromium and molybdenum

[D].

none of the above

Answer: Option A

Explanation:

No answer description available for this question.