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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-5 section-1

Each section contains 100 MCQs on General Science .
41
Which of the following are the ingredients of gun metal?
Discuss
Answer & Solution
Answer: Option D
Solution:
Modified gunmetal contains lead in addition to the zinc; it is typically composed of 86% copper, 9.5% tin, 2.5% lead, and 2% zinc. It is used for gears and bearings.
42
From which mineral is radium obtained?
Discuss
Answer & Solution
Answer: Option D
Solution:
On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the elements radium and polonium in their research of pitch blende.
43
What is laughing gas?
Discuss
Answer & Solution
Answer: Option A
Solution:
Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O.
44
Actinides are the elements with atomic numbers from
Discuss
Answer & Solution
Answer: Option C
Solution:
Actinides are the elements with atomic numbers from 89 to 103.
45
The two elements that are frequently used for making transistors are:
Discuss
Answer & Solution
Answer: Option B
Solution:
The two elements that are frequently used for making transistors are Silicon and Germanium.
46
The filament of an electric bulb is made of
Discuss
Answer & Solution
Answer: Option A
Solution:
The filament of an electric bulb is made of Tungsten.
47
Diamond is an allotropic form of:
Discuss
Answer & Solution
Answer: Option B
Solution:
Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in structure.
48
In fireworks, the green flame is produced because of
Discuss
Answer & Solution
Answer: Option B
Solution:
In fireworks, the green flame is produced because of barium.
49
Permanent hardness of water can be removed by adding:
Discuss
Answer & Solution
Answer: Option B
Solution:
Temporary hardness is due to presence of soluble bicarbonates of calcium and magnesium and permanent hardness is due to the presence of chlorides and sulphate of calcium and magnesium.
50
Marsh gas is
Discuss
Answer & Solution
Answer: Option C
Solution:
Marsh gas, swamp gas, and bog gas is a mixture of methane, hydrogen sulfide, and carbon dioxide, produced naturally within some geographical marshes, swamps, and bogs.