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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