1000 Best General Science MCQ-Questions
Q41). What is laughing gas?
a).Nitrous Oxide
b).Carbon monoxide
c).Sulphur dioxide
d).Hydrogen peroxide
Correct Answer:
Nitrous Oxide
Explanation:
Q42). Actinides are the elements with atomic numbers from
a).97 to 104
b).101 to 115
c).89 to 103
d).36 from 43
Correct Answer:
89 to 103
Explanation:
Q43). 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
Correct Answer:
silicon and germanium
Explanation:
Q44). The filament of an electric bulb is made of
a).tungsten
b).nichrome
c).graphite
d).iron
Correct Answer:
tungsten
Explanation:
Q45). Diamond is an allotropic form of
a).germanium
b).carbon
c).silicon
d).sulphur
Correct Answer:
carbon
Explanation:
Q46). In fireworks, the green flame is produced because of
a).sodium
b).barium
c).mercury
d).potassium
Correct Answer:
barium
Explanation:
Q47). Permanent hardness of water can be removed by adding
a).chlorine
b).washing soda
c).potassium permanganate
d).bleaching powder
Correct Answer:
washing soda
Explanation:
Q48). Marsh gas is
a).nitrogen
b).ethane
c).methane
d).hydrogen
Correct Answer:
methane
Explanation: