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Practice MCQ Questions and answers on General Science-GK

Learn and practice General Knowledge questions and answers on General Science with very easy and understandable explanations. GK questions are very helpful different type of competitive exams. Page-3 section-1

Each section contains 100 MCQs on General Science .
21
In which of the following activities silicon carbide is used?
Discuss
Answer & Solution
Answer: Option C
Solution:
Silicon carbide is used in cutting very hard substances.
22
The average salinity of seawater is
Discuss
Answer & Solution
Answer: Option B
Solution:
Salinity is generally low at the equator and at the poles, and high at mid-latitudes. The average salinity is about 35 parts per thousand. Stated in another way, about 3.5 percent of the weight of seawater comes from the dissolved salts.
23
When an iron nail gets rusted, iron oxide is formed
Discuss
Answer & Solution
Answer: Option C
Solution:
When an iron nail gets rusted, iron oxide is formed with increase in the weight of the nail.
24
Galvanised iron sheets have a coating of
Discuss
Answer & Solution
Answer: Option C
Solution:
Galvanization is the process of applying a protective zinc coating to steel or iron in order to prevent it from rusting.
25
Among the various allotrope of carbon
Discuss
Answer & Solution
Answer: Option C
Solution:
Among the various allotrope of carbon diamond is the hardest, graphite is the softest.
26
The group of metals Fe, Co, Ni may best called as:
Discuss
Answer & Solution
Answer: Option A
Solution:
The group of metals Fe, Co, Ni may best called as transition metals.
27
Heavy water is:
Discuss
Answer & Solution
Answer: Option A
Solution:
Heavy water is a form of water that contains only deuterium rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
28
The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
Discuss
Answer & Solution
Answer: Option D
Solution:
The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of sulphur.
29
The element common to all acids is
Discuss
Answer & Solution
Answer: Option A
Solution:
Hydrogen is the common element in all acids.
30
Non stick cooking utensils are coated with
Discuss
Answer & Solution
Answer: Option C
Solution:
Most nonstick pans are coated with polytetrafluoroethylene, also known as Teflon.