General Science Chemistry MCQs
Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination
1. The term “white coal” sometimes referred to which of the following?
[A] Geothermal Electricity
[B] Wind Energy
[C] Hydroelectricity
[D] Biomass Energy
Show Answer
Correct Answer: C [Hydroelectricity]
Notes:
The term white coal was used for Hydroelectricity, particularly in Europe, because of its capability to produce more energy than any other source except coal. The term was coined by a French Engineer Aristide Bèrges.
2. Which of the following is not a non-metallic mineral?
[A] Mica
[B] Bauxite
[C] Granite
[D] Silica
Show Answer
Correct Answer: B [Bauxite]
Notes:
Non-metallic minerals are those minerals which do not contain metals. Examples of Non-Metallic minerals include limestone, mica, coal, gypsum, dolomite, phosphate, salt, granite etc.
3. Which among the following types of glasses contains Cerium and other rare earths and has a high absorption of ultraviolet rays?
[A] Crookes Glass
[B] Pyrex Glass
[C] Flint Glass
[D] Crown Glass
Show Answer
Correct Answer: A [Crookes Glass]
Notes:
Crookes glass comprises Cerium oxide (CiO2) which sharply absorbs the ultraviolet rays from the sunlight. It is used in making lenses of eye glasses.
4. Which among the following is a common salt in Detergents?
[A] Sulphate
[B] Nitrate
[C] Sulphonate
[D] Carbonate
Show Answer
Correct Answer: A [Sulphate]
Notes:
Sodium sulfate, used as a filler in detergent powder, enables the adjustment of the concentration of the active matter in the detergent, as required.
5. Which among the following is major component of Gobar Gas?
[A] Butane
[B] Ethane
[C] Propane
[D] Metahne
Show Answer
Correct Answer: D [Metahne]
Notes:
Gobar Gas or Biogas is mostly methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulfide (H2S), moisture and siloxanes.
6. Charles Goodyear is known for which of the following ?
[A] Experiments on Rubber Plants
[B] Vulcanization of Rubber
[C] Invention of Radial Tyres
[D] Invention of Artificial Rubber
Show Answer
Correct Answer: B [Vulcanization of Rubber]
Notes:
Charles Goodyear, American inventor of the vulcanization process that made possible the commercial use of rubber. The Goodyear Tire and Rubber Company was posthumously named after him.
7. Kimberley Process” is related to which among the following ?
[A] Gold
[B] Diamonds
[C] Semi Precious Stones
[D] Aluminium
Show Answer
Correct Answer: B [Diamonds]
Notes:
The Kimberley Process (KP) is a commitment to remove conflict diamonds from the global supply chain. India was one of the founder participants in the Kimberley Process Certification Scheme (KPCS). Launched in 2003, the Kimberley Process is a coalition of governments, civil society and the diamond industry to eliminate the trade in so-called conflict diamonds.
8. With reference to the halogen family of elements, consider the following:
- The halogen that is most active chemically
- The halogen with the smallest ionic radius
- The halogen that first shows some visible metallic properties at room temperature
Which among the following is the correct set of elements denoting the above properties respectively:
[A] Fluorine, Chlorine, Iodine
[B] Iodine, Fluorine, Chlorine
[C] Fluorine, Fluorine, Iodine
[D] Fluorine, Iodine, Chlorine
Show Answer
Correct Answer: C [ Fluorine, Fluorine, Iodine]
Notes:
In the halogen family, the most active nonmetal would be the top element, fluorine, because it has the highest electronegativity. As you proceed down a group, the ionic radius increases as additional energy levels are filled farther from the nucleus. Therefore fluorine, the top element, has the smallest ionic radius. Some physical characteristics of metal are found in iodine, the fourth halogen down in the group.
9. Consider the following comparisons of Diesel with Gasoline:
1. In comparison to Gasoline, Diesel offers low volumetric energy density
2. In comparison to Gasoline, Diesel is cheap all over the world
3. In comparison to Gasoline, CO2 emissions from diesel are higher
Choose the correct option from the codes given below:
[A] Only 1
[B] 1 & 2
[C] 1, 2 & 3
[D] None of them
Show Answer
Correct Answer: D [ None of them]
Notes:
Diesel is not cheaper than gasoline or petrol in all countries. When burned, Diesel offers a net heating value of 43.1 MJ/kg as opposed to 43.2 MJ/kg for gasoline. However, due to the higher density, diesel offers a higher volumetric energy density. CO2 emissions from diesel are slightly lower than for gasoline.
10. The Modern periodic table has__:
[A] seven periods and eighteen groups
[B] nine periods and eighten groups
[C] seven periods and twenty one groups
[D] nine periods and twenty one groups
Show Answer
Correct Answer: A [ seven periods and eighteen groups]
Notes:
Recently, the International Union of Pure and Applied Chemistry (IUPAC) have officially confirmed the permanent addition of four new elements to the periodic table. The IUPAC had announced last week that all four elements with atomic number 113, 115, 117 and 118 have met the criteria for discovery.Thus; it completed the seventh row of periodic table.
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