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
11. Which among the following substances is most suitable for making Compact Discs?
[A] PVC
[B] Polyethylene
[C] Polyamides
[D] Polycarbonates
Show Answer
Correct Answer: D [Polycarbonates
]
12. Which among the following is known as Quick Lime?
[A] CaO
[B] CaCO2
[C] Ca(OH)2
[D] CaCl2
Show Answer
Correct Answer: A [CaO]
Notes:
Calcium oxide (CaO), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic, alkaline crystalline solid at room temperature.
13. 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.
14. Who among the following scientists had discovered Radium?
[A] Marie Sklodowska-Curie and Pierre Curie
[B] André-Louis Debierne
[C] Kasimir Fajans
[D] Oswald Helmuth Göhring
Show Answer
Correct Answer: A [Marie Sklodowska-Curie and Pierre Curie ]
15. 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
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Correct Answer: B [Vulcanization of Rubber]
16. The colors in the fine cut diamond are because of which among the following?
[A] Variance in transparency of diamond
[B] Variance in index of refraction
[C] Presence of Impurities
[D] Existence of definite planer layers
Show Answer
Correct Answer: C [Presence of Impurities]
Notes:
Pure diamond should transmit visible light and appear as a clear colorless crystal. Colors in diamond originate from lattice defects and impurities. The diamond crystal lattice is exceptionally strong and only atoms of nitrogen, boron and hydrogen can be introduced into diamond during the growth at significant concentrations (up to atomic percents). Nitrogen gives yellowish color while the Boron gives bluish color.
17. Which of the following is incorrect about the Inter atomic and Intermolecular Forces?
[A] Both the forces are electrical in origin
[B] Both the forces are active over short distances
[C] General shape of force-distance graph is similar for both the forces
[D] None of the above
Show Answer
Correct Answer: D [None of the above]
Notes:
Comparison between Inter atomic and Intermolecular Forces: (i) Both Inter atomic and Intermolecular forces are electrical in origin. (ii) Both Inter atomic and Intermolecular forces are active over short distances. (iii) General shape of force-distance graph for both the forces is similar. (iv) Both the forces are attractive up to certain distance between atoms/molecules and become repulsive when the distance between them becomes less than that value.
18. Which of the following states of matter has the weakest Intermolecular forces?
[A] Solids
[B] Liquids
[C] Gases
[D] It is same in solids, liquids and gases
Show Answer
Correct Answer: C [Gases]
Notes:
The three states of matter varies from each other due to the following factors. (1) The different magnitudes of the interatomic and intermolecular forces. (2) The extent of random thermal motion of atoms and molecules of a substance (which depends upon temperature). The Intermolecular force is strongest in solids and weakest in gases.
19. What is the ratio of change in configuration to the original configuration called as?
[A] Strain
[B] Stress
[C] Elasticity
[D] Rebound
Show Answer
Correct Answer: A [Strain]
Notes:
The ratio of change in configuration to the original configuration is called strain. Strain are of three types : 1. Linear 2. Volumetric 3. Shearing
20. Which of the following is the unit of Strain?
[A] Newton
[B] Kg
[C] Watt
[D] None of the above
Show Answer
Correct Answer: D [None of the above]
Notes:
As Strain is the ratio of two like quantities, it has no dimensions and units. Strain = Change in configuration/Original configuration
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