Engineering Entrance
Q. What is the primary factor affecting the rate of adsorption of a gas on a solid surface?
A.
Temperature
B.
Pressure
C.
Surface area
D.
Molecular weight
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Solution
The rate of adsorption increases with the surface area of the solid, as more surface provides more sites for gas molecules to adhere.
Correct Answer: C — Surface area
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Q. What is the primary function of proteins in the body? (2023)
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
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Solution
Proteins act as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
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Q. What is the primary function of proteins in the body? (2023) 2023
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
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Solution
Proteins primarily function as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
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Q. What is the primary gas in the Earth's atmosphere? (2022)
A.
Oxygen
B.
Nitrogen
C.
Carbon Dioxide
D.
Hydrogen
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Solution
Nitrogen makes up about 78% of the Earth's atmosphere, making it the primary gas.
Correct Answer: B — Nitrogen
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Q. What is the primary mechanism of adsorption in activated charcoal?
A.
Chemical bonding
B.
Physical adsorption
C.
Capillary action
D.
Electrostatic attraction
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Solution
Activated charcoal primarily adsorbs substances through physical adsorption due to its high surface area and porous structure.
Correct Answer: B — Physical adsorption
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Q. What is the primary process involved in adsorption? (2023)
A.
Chemical reaction
B.
Physical attraction
C.
Evaporation
D.
Condensation
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Solution
Adsorption primarily involves physical attraction between the adsorbate and the surface of the adsorbent.
Correct Answer: B — Physical attraction
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Q. What is the primary process involved in the adsorption of gases on solid surfaces? (2022) 2022
A.
Diffusion
B.
Condensation
C.
Chemical reaction
D.
Van der Waals forces
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Solution
Adsorption of gases on solid surfaces primarily occurs due to Van der Waals forces, which are weak intermolecular forces that allow gas molecules to adhere to the surface.
Correct Answer: D — Van der Waals forces
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Q. What is the primary reason for the high compressibility of gases?
A.
Large intermolecular spaces
B.
Strong intermolecular forces
C.
Low temperature
D.
High pressure
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Solution
Gases are highly compressible due to large intermolecular spaces between particles.
Correct Answer: A — Large intermolecular spaces
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Q. What is the primary reason for the high electronegativity of halogens? (2020)
A.
Large atomic size
B.
High ionization energy
C.
Low electron affinity
D.
High atomic mass
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Solution
Halogens have high electronegativity due to their high ionization energy, which allows them to attract electrons effectively.
Correct Answer: B — High ionization energy
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Q. What is the primary reason for the variable oxidation states of transition metals?
A.
Presence of d-electrons
B.
High atomic mass
C.
Low ionization energy
D.
High electronegativity
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Solution
The presence of d-electrons allows transition metals to exhibit variable oxidation states.
Correct Answer: A — Presence of d-electrons
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Q. What is the primary reason that gases can be compressed more than liquids or solids?
A.
High density
B.
Low density
C.
Large intermolecular spaces
D.
Strong intermolecular forces
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Solution
Gases can be compressed more than liquids or solids because they have large intermolecular spaces.
Correct Answer: C — Large intermolecular spaces
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Q. What is the primary use of boron in industry? (2019) 2019
A.
Fertilizers
B.
Glass production
C.
Metallurgy
D.
Pharmaceuticals
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Solution
Boron is primarily used in the production of glass and ceramics.
Correct Answer: B — Glass production
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Q. What is the primary use of polyethylene?
A.
Insulation
B.
Packaging
C.
Textiles
D.
Adhesives
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Solution
Polyethylene is primarily used in packaging due to its flexibility and durability.
Correct Answer: B — Packaging
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Q. What is the primary use of polystyrene?
A.
Insulation
B.
Packaging
C.
Textiles
D.
Adhesives
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Solution
Polystyrene is widely used in packaging materials due to its lightweight and cushioning properties.
Correct Answer: B — Packaging
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Q. What is the primary use of sulfuric acid (H2SO4)? (2022)
A.
Fertilizer
B.
Battery acid
C.
Detergent
D.
Food preservative
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Solution
Sulfuric acid is primarily used as battery acid in lead-acid batteries.
Correct Answer: B — Battery acid
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Q. What is the principal quantum number for the outermost electron in sodium (Na)? (2022) 2022
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Solution
Sodium has an atomic number of 11, and its outermost electron is in the 3rd shell, so n=3.
Correct Answer: C — 3
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Q. What is the principal quantum number for the outermost electrons in sodium (Na)? (2023) 2023
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Solution
Sodium has the electronic configuration of 1s² 2s² 2p⁶ 3s¹, so the principal quantum number for the outermost electrons is 3.
Correct Answer: C — 3
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Q. What is the probability of drawing a king from a standard deck of cards? (2023)
A.
1/13
B.
1/52
C.
1/4
D.
1/12
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Solution
Number of kings = 4. Probability = 4/52 = 1/13.
Correct Answer: A — 1/13
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Q. What is the probability of drawing a queen from a standard deck of cards?
A.
1/13
B.
1/26
C.
1/52
D.
1/4
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Solution
Number of queens = 4. Probability = 4/52 = 1/13.
Correct Answer: A — 1/13
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Q. What is the probability of flipping a coin and getting heads? (2023)
A.
1/2
B.
1/3
C.
1/4
D.
1
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Solution
There are 2 outcomes: heads or tails. Probability of heads = 1/2.
Correct Answer: A — 1/2
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Q. What is the probability of rolling a sum of 7 with two dice?
A.
1/6
B.
1/12
C.
1/36
D.
5/36
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Solution
Possible combinations for sum of 7 = (1,6), (2,5), (3,4), (4,3), (5,2), (6,1) = 6. Total outcomes = 36. Probability = 6/36 = 1/6.
Correct Answer: D — 5/36
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Q. What is the process of a solid turning directly into a gas called? (2021)
A.
Condensation
B.
Sublimation
C.
Evaporation
D.
Deposition
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Solution
The process of a solid turning directly into a gas is called sublimation.
Correct Answer: B — Sublimation
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Q. What is the process of forming a polymer from monomers called?
A.
Polymerization
B.
Condensation
C.
Sublimation
D.
Depolymerization
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Solution
The process of forming a polymer from monomers is called polymerization.
Correct Answer: A — Polymerization
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Q. What is the product of 9 and 6? (2016)
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Q. What is the product of 9 and 7? (2016)
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Q. What is the product of electrolysis of water?
A.
Hydrogen and Oxygen
B.
Hydrogen and Carbon
C.
Oxygen and Nitrogen
D.
Hydrogen and Chlorine
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Solution
The products of electrolysis of water are hydrogen and oxygen.
Correct Answer: A — Hydrogen and Oxygen
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Q. What is the product of the complete combustion of propane?
A.
CO2 and H2O
B.
CO and H2O
C.
C and H2
D.
C2H4
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Solution
The complete combustion of propane produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complex numbers (1 + i) and (1 - i)? (2023) 2023
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Solution
(1 + i)(1 - i) = 1^2 - i^2 = 1 - (-1) = 2.
Correct Answer: A — 2
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Q. What is the product of the complex numbers 2 + 3i and 4 - i? (2021)
A.
11 + 10i
B.
14 + 5i
C.
5 + 10i
D.
10 + 5i
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Solution
(2 + 3i)(4 - i) = 8 - 2i + 12i - 3i^2 = 8 + 10i + 3 = 11 + 10i.
Correct Answer: A — 11 + 10i
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Q. What is the product of the oxidation of 2-Propanol? (2022)
A.
Acetone
B.
Ethanol
C.
Propanoic acid
D.
Methanol
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Solution
2-Propanol oxidizes to form Acetone, which is a ketone.
Correct Answer: A — Acetone
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