general science questions

41.

What is laughing gas?
A.     Nitrous Oxide
B.     Carbon monoxide
C.     Sulphur dioxide
D.     Hydrogen peroxide
Answer & Explanation

Answer: Option A

Explanation:

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42.

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 & Explanation

Answer: Option C

Explanation:

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43.

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 & Explanation

Answer: Option B

Explanation:

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44.

The filament of an electric bulb is made of
A.     tungsten    B.     nichrome
C.     graphite    D.     iron
Answer & Explanation

Answer: Option A

Explanation:

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45.

Diamond is an allotropic form of
A.     germanium    B.     carbon
C.     silicon    D.     sulphur
Answer & Explanation

Answer: Option B

Explanation:

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