Elements And Metals : 2

Question 16 :

What is laughing gas?

A). Nitrous Oxide
B). Carbon monoxide
C). Sulphur dioxide
D). Hydrogen peroxide
Answer : Option A

Question 17 :

Actinides are the elements with atomic numbers from

A). 97 to 104
B). 101 to 115
C). 89 to 103
D). 36 from 43
Answer : Option C

Question 18 :

The two elements that are frequently used for making transistors are

A). boron and aluminium
B). silicon and germanium
C). iridium and tungsten
D). niobium and columbium
Answer : Option B

Question 19 :

The filament of an electric bulb is made of

A). tungsten
B). nichrome
C). graphite
D). iron
Answer : Option A

Question 20 :

Diamond is an allotropic form of

A). germanium
B). carbon
C). silicon
D). sulphur
Answer : Option B