The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be_____________________?

Question: Cassiterite is an ore of
[A].

tin

[B].

lead

[C].

molybdenum

[D].

chromium

Answer: Option A

Explanation:

No answer description available for this question.

Question: Window panes of aeroplanes are normally made of
[A].

perspex (PMMA)

[B].

teflon (PTFE)

[C].

bakelite (phenol formaldehyde)

[D].

polystyrene

Answer: Option A

Explanation:

No answer description available for this question.

Question: Disposable patterns are made of
[A].

metal

[B].

polystyrene

[C].

rubber

[D].

wood

Answer: Option B

Explanation:

No answer description available for this question.

Question: More than 95% of __________ is present in corrundum.
[A].

SiO2

[B].

A12O3

[C].

CaSiO2

[D].

MgO

Answer: Option B

Explanation:

No answer description available for this question.

Question: Lead percentage in pure galena is about
[A].

8.6

[B].

86.6

[C].

35.8

[D].

61.4

Answer: Option A

Explanation:

No answer description available for this question.