Engineering Entrance
Q. What is the work done by an ideal gas during an isothermal expansion from volume V1 to V2 at temperature T? (2021)
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A.
nRT ln(V2/V1)
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B.
nRT (V2 - V1)
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C.
PV
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D.
0
Solution
The work done during an isothermal expansion is given by W = nRT ln(V2/V1).
Correct Answer: A — nRT ln(V2/V1)
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Q. What is the work done by an ideal gas during isothermal expansion? (2021)
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A.
0
-
B.
nRT ln(Vf/Vi)
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C.
nRT (Vf - Vi)
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D.
nR (Tf - Ti)
Solution
For an ideal gas undergoing isothermal expansion, the work done is given by W = nRT ln(Vf/Vi).
Correct Answer: B — nRT ln(Vf/Vi)
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Q. What is the work done on a gas when it is compressed from 5 L to 2 L at a constant pressure of 200 kPa? (2022)
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A.
600 J
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B.
800 J
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C.
1000 J
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D.
1200 J
Solution
Work done (W) = P * ΔV = 200 kPa * (2 L - 5 L) = 200 kPa * (-3 L) = -600 J (work done on the gas).
Correct Answer: C — 1000 J
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Q. What is the work done when 1 mole of an ideal gas expands isothermally from 10 L to 20 L at 300 K? (R = 8.31 J/mol·K) (2023)
-
A.
0 J
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B.
830 J
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C.
1660 J
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D.
2490 J
Solution
Work done = nRT ln(Vf/Vi) = 1 mol × 8.31 J/mol·K × 300 K × ln(20/10) = 1660 J.
Correct Answer: C — 1660 J
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Q. What is the work done when 1 mole of an ideal gas expands isothermally from 10 L to 20 L at 300 K? (2022)
-
A.
300 J
-
B.
600 J
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C.
150 J
-
D.
0 J
Solution
Work done W = nRT ln(Vf/Vi) = 1 * 8.314 * 300 * ln(20/10) = 600 J.
Correct Answer: B — 600 J
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Q. What is the work done when a force of 10 N moves an object 5 m in the direction of the force? (2016)
-
A.
50 J
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B.
25 J
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C.
10 J
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D.
5 J
Solution
Work done (W) = Force × Distance = 10 N × 5 m = 50 J.
Correct Answer: A — 50 J
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Q. What is the work done when a force of 15 N moves an object 3 m at an angle of 0 degrees to the direction of motion?
-
A.
45 J
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B.
30 J
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C.
60 J
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D.
75 J
Solution
Work = Force * Distance * cos(θ) = 15 N * 3 m * cos(0°) = 45 J.
Correct Answer: A — 45 J
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Q. What is the x-intercept of the line 5x - 2y + 10 = 0?
Solution
Setting y = 0 in the equation gives 5x + 10 = 0, thus x = -2.
Correct Answer: B — 2
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Q. What is the y-intercept of the line 3x - 2y = 6? (2020) 2020
Solution
Setting x = 0, we get -2y = 6, so y = -3.
Correct Answer: A — 3
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Q. What is the y-intercept of the line 3x - 4y = 12? (2023)
Solution
Setting x = 0, we get -4y = 12, so y = -3.
Correct Answer: A — 3
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Q. What type of adsorption is characterized by the formation of a chemical bond? (2019)
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A.
Physisorption
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B.
Chemisorption
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C.
Desorption
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D.
Multilayer adsorption
Solution
Chemisorption is characterized by the formation of a chemical bond between the adsorbate and the surface.
Correct Answer: B — Chemisorption
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Q. What type of biomolecule is RNA? (2014)
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A.
Protein
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B.
Carbohydrate
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C.
Nucleic Acid
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D.
Lipid
Solution
RNA is classified as a nucleic acid, which plays a crucial role in protein synthesis.
Correct Answer: C — Nucleic Acid
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Q. What type of bond is formed between sodium (Na) and chlorine (Cl) in NaCl? (2019)
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A.
Covalent bond
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B.
Ionic bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
NaCl is formed by the transfer of an electron from sodium to chlorine, resulting in an ionic bond.
Correct Answer: B — Ionic bond
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Q. What type of bond is formed when two atoms share electrons? (2023)
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A.
Ionic bond
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B.
Covalent bond
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C.
Metallic bond
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D.
Hydrogen bond
Solution
A covalent bond is formed when two atoms share electrons to achieve stability.
Correct Answer: B — Covalent bond
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Q. What type of bond is formed when two atoms share electrons? (2023) 2023
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A.
Ionic bond
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B.
Covalent bond
-
C.
Metallic bond
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D.
Hydrogen bond
Solution
A covalent bond is formed when two atoms share electrons to achieve stability.
Correct Answer: B — Covalent bond
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Q. What type of bond is present in a carbon-carbon double bond?
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Quadruple bond
Solution
A carbon-carbon double bond consists of one sigma bond and one pi bond, making it a double bond.
Correct Answer: B — Double bond
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Q. What type of bond is present in alkenes?
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Quadruple bond
Solution
Alkenes contain at least one double bond between carbon atoms.
Correct Answer: B — Double bond
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Q. What type of bond is present in O2? (2022)
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A.
Single bond
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B.
Double bond
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C.
Triple bond
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D.
Quadruple bond
Solution
O2 has a double bond, as two pairs of electrons are shared between the two oxygen atoms.
Correct Answer: B — Double bond
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Q. What type of bond is primarily responsible for the strength of polymers?
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A.
Ionic bond
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B.
Covalent bond
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C.
Hydrogen bond
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D.
Metallic bond
Solution
Covalent bonds are primarily responsible for the strength and stability of polymer chains.
Correct Answer: B — Covalent bond
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Q. What type of bond is primarily responsible for the structure of polymers?
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A.
Ionic bond
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B.
Covalent bond
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C.
Hydrogen bond
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D.
Metallic bond
Solution
Covalent bonds are primarily responsible for the structure of polymers, linking monomers together.
Correct Answer: B — Covalent bond
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Q. What type of bond links amino acids together in a protein? (2023) 2023
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A.
Ionic bond
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B.
Covalent bond
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C.
Hydrogen bond
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D.
Peptide bond
Solution
A peptide bond is a specific type of covalent bond that links amino acids together in proteins.
Correct Answer: D — Peptide bond
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Q. What type of intermolecular force is present in liquid water? (2021)
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A.
London dispersion forces
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B.
Dipole-dipole interactions
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C.
Hydrogen bonding
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D.
Ionic interactions
Solution
Liquid water exhibits hydrogen bonding due to the attraction between the hydrogen atoms of one water molecule and the oxygen atom of another.
Correct Answer: C — Hydrogen bonding
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Q. What type of polymer is nylon?
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A.
Addition polymer
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B.
Condensation polymer
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C.
Natural polymer
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D.
Composite polymer
Solution
Nylon is a condensation polymer formed from the reaction of diamines and dicarboxylic acids.
Correct Answer: B — Condensation polymer
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Q. What type of reaction is involved in the conversion of an alkene to an alkane? (2023)
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A.
Hydrogenation
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B.
Dehydration
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C.
Halogenation
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D.
Oxidation
Solution
Hydrogenation is the process of adding hydrogen to an alkene to convert it into an alkane.
Correct Answer: A — Hydrogenation
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Q. What type of reaction occurs when an alkene reacts with hydrogen? (2023) 2023
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A.
Hydrolysis
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B.
Hydrogenation
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C.
Dehydration
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D.
Oxidation
Solution
The reaction of an alkene with hydrogen is called hydrogenation.
Correct Answer: B — Hydrogenation
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Q. What type of reaction occurs when ethene is converted to ethane? (2020)
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A.
Hydrogenation
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B.
Dehydrogenation
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C.
Halogenation
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D.
Hydrolysis
Solution
The conversion of ethene to ethane involves the addition of hydrogen, which is known as hydrogenation.
Correct Answer: A — Hydrogenation
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Q. What type of reaction occurs when ethene reacts with bromine?
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A.
Substitution
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B.
Addition
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C.
Elimination
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D.
Oxidation
Solution
The reaction between ethene and bromine is an addition reaction, forming dibromoethane.
Correct Answer: B — Addition
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Q. What type of reaction occurs when haloalkanes react with aqueous KOH?
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A.
Nucleophilic substitution
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B.
Elimination
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C.
Addition
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D.
Redox
Solution
Haloalkanes react with aqueous KOH primarily through nucleophilic substitution to form alcohols.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when haloalkanes react with metals like magnesium?
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A.
Substitution
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B.
Elimination
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C.
Addition
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D.
Grignard formation
Solution
The reaction of haloalkanes with metals like magnesium leads to Grignard formation, which is a key step in organic synthesis.
Correct Answer: D — Grignard formation
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Q. What type of reaction occurs when haloalkanes react with metals like zinc?
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A.
Substitution
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B.
Elimination
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C.
Reduction
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D.
Oxidation
Solution
The reaction of haloalkanes with metals like zinc is a reduction reaction, forming alkanes.
Correct Answer: C — Reduction
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