General Science Chemistry MCQ
41. Which among the following is the objective of the Methyl tert-butyl ether (MTBE) mixing with Petroleum?
[A] Raise Octane Number
[B] Antioxidant Stabilizer
[C] Lead Scavanger
[D] Fuel Dye
[A] Raise Octane Number
Notes:
MTBE is a gasoline additive, used as an oxygenate to raise the octane number. Its use is controversial in the US and declining in that country in part because of its occurrence in groundwater and legislation favoring ethanol.
42. When sulphur is heated with rubber, the process is commonly known as ______. ?
[A] Galvanization
[B] Sulphonation
[C] Vulcanization
[D] Hydrodesulfurization
[C] Vulcanization
Notes:
Natural rubber becomes soft at high temperature (>335 K) and brittle at low temperatures (<283 k) and shows high water absorption capacity. It is soluble in non-polar solvents and is non-resistant to attack by oxidising agents. To improve upon these physical properties, a process of vulcanisation is carried out. This process consists of heating a mixture of raw rubber with sulphur and an appropriate additive at a temperature range between 373 K to 415 K. On vulcanisation, sulphur forms cross links at the reactive sites of double bonds and thus the rubber gets stiffened.
In the manufacture of tyre rubber, 5% of sulphur is used as a crosslinking agent.
43. Which among the following kind of glass that is used generally in making of the bullet proof screens?
[A] Pyrex glass
[B] Jena glass
[C] Reinforced glass
[D] Flint glass
[C] Reinforced glass
Notes:
Reinforced Glass or Toughened glass or tempered glass is a kind of safety glass is used as s a component of bulletproof glass, for diving masks, and various types of plates and cookware.
44. Which of the following chemicals is also known as “sweet oil of vitriol”?
[A] Diethyl ether
[B] Aluminium sulphate
[C] Sulphuric acid
[D] Iron(III) sulphate
[A] Diethyl ether
Notes:
Diethyl ether is a colourless, highly volatile & flammable organic compound. It was earlier used for anaesthesia but after the development of non-flammable drugs, its uses as anaesthetic has been reduced.
45. 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
[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.
46. Which of the following relations between Kinetic energy and Potential energy is true about solids?
[A] Kinetic energy = Potential energy
[B] Kinetic energy > Potential energy
[C] Kinetic energy >> Potential energy
[D] Kinetic energy < Potential energy
[D] Kinetic energy < Potential energy
Notes:
In Solids, Kinetic energy is always less than the Potential energy. For liquids, Kinetic energy > Potential energy. For Gases, Kinetic energy >> Potential energy.
47. What is the force that is required to produce unit elongation in a wire known as?
[A] Bulk modulus
[B] Thermal strain
[C] Thermal stress
[D] Force constant
[D] Force constant
Notes:
Force constant of material of wire is the force required to produce unit elongation in a wire. It is denoted by k. K = F/l or K = YA/l
48. What is the general electron configuration of all alkaline earth metals?
[A] ns1
[B] ns2
[C] ns2 np6
[D] None of the above
[B] ns2
Notes:
The general electron configuration of all alkaline earth metals is ns2.
49. Which of the following is correct about Acetylene?
[A] It is the popular name of ethyne
[B] It is the first stable member of alkyne series
[C] Both A and B
[D] None of the above.
[C] Both A and B
Notes:
The first stable member of the alkyne series is ethyne and is popularly known as acetylene. Acetylene is used for arc welding purposes in the form of oxyacetylene flame.
50. Which of the following is NOT correct about Ethanol?
[A] It is a good solvent
[B] It gives out hydrogen when reacted with Sodium
[C] It is an odorless liquid
[D] All the above are correct
[C] It is an odorless liquid
Notes:
Ethanol is a good solvent and reacts with sodium leading to the evolution of hydrogen. It is a colorless liquid with a slight characteristic odor.