Major Competitive Exams
Q. What is the work function of a metal?
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A.
The energy required to ionize an atom
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B.
The energy required to remove an electron from the surface of a metal
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C.
The energy of the emitted electrons
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D.
The energy of the incident photons
Solution
The work function is the minimum energy required to remove an electron from the surface of a metal.
Correct Answer: B — The energy required to remove an electron from the surface of a metal
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Q. What is the work-energy theorem?
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A.
Work done is equal to change in momentum
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B.
Work done is equal to change in kinetic energy
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C.
Work done is equal to change in potential energy
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D.
Work done is equal to change in total energy
Solution
The work-energy theorem states that the work done on an object is equal to the change in its kinetic energy.
Correct Answer: B — Work done is equal to change in kinetic energy
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Q. What is the x-intercept of the line 3x + 4y - 12 = 0?
Solution
To find the x-intercept, set y = 0. Thus, 3x - 12 = 0 gives x = 4.
Correct Answer: B — 3
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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 x-intercept of the line 6x - 2y = 12?
Solution
Setting y = 0 in the equation gives 6x = 12, thus x = 2. The x-intercept is 2.
Correct Answer: B — 3
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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 is the y-intercept of the line 5x + 2y - 10 = 0?
Solution
Setting x = 0 in the equation gives 2y - 10 = 0, thus y = 5.
Correct Answer: C — 2
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Q. What is the y-intercept of the line represented by the equation 5x + 2y = 10?
Solution
Set x = 0: 2y = 10 => y = 5. The y-intercept is (0, 5).
Correct Answer: B — 2
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Q. What is the Young's modulus of a material if a stress of 200 MPa produces a strain of 0.01? (2021)
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A.
2000 MPa
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B.
20 MPa
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C.
200 MPa
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D.
2 MPa
Solution
Young's modulus (E) = Stress / Strain = 200 MPa / 0.01 = 20000 MPa = 2000 MPa.
Correct Answer: A — 2000 MPa
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Q. What phenomenon occurs when a liquid rises in a narrow tube against gravity?
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A.
Viscosity
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B.
Surface tension
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C.
Capillarity
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D.
Hydrostatic pressure
Solution
Capillarity is the phenomenon where liquid rises in a narrow tube due to surface tension.
Correct Answer: C — Capillarity
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Q. What role do enzymes play in biological systems?
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A.
They provide structural support
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B.
They act as catalysts for biochemical reactions
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C.
They store genetic information
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D.
They transport molecules across membranes
Solution
Enzymes are proteins that act as catalysts, speeding up biochemical reactions without being consumed in the process.
Correct Answer: B — They act as catalysts for biochemical reactions
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Q. What role does phosphorus play in plants? (2021)
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A.
Energy transfer
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B.
Water absorption
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C.
Cell wall formation
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D.
Photosynthesis
Solution
Phosphorus is vital for energy transfer through ATP and is also important for nucleic acid synthesis.
Correct Answer: A — Energy transfer
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Q. What structure forms during prophase to help separate chromosomes? (2022)
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A.
Centromere
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B.
Spindle fibers
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C.
Chromatin
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D.
Nuclear envelope
Solution
Spindle fibers form during prophase to help separate the chromosomes during mitosis.
Correct Answer: B — Spindle fibers
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Q. What structure regulates the entry and exit of substances in a cell? (2021)
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A.
Cell Wall
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B.
Nucleus
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C.
Plasma Membrane
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D.
Cytoplasm
Solution
The plasma membrane regulates the entry and exit of substances in and out of the cell, maintaining homeostasis.
Correct Answer: C — Plasma Membrane
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Q. What term describes the role and position a species has in its environment? (2020)
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A.
Habitat
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B.
Niche
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C.
Biome
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D.
Ecosystem
Solution
The niche of a species is its role and position in its environment, including all interactions with biotic and abiotic factors.
Correct Answer: B — Niche
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Q. What term describes the role of an organism in its ecosystem? (2022)
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A.
Habitat
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B.
Niche
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C.
Biome
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D.
Community
Solution
Niche refers to the role and position a species has in its environment, including all interactions with biotic and abiotic factors.
Correct Answer: B — Niche
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Q. What term describes the role of an organism in its environment? (2019)
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A.
Habitat
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B.
Niche
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C.
Biome
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D.
Community
Solution
The niche of an organism refers to its role and position in its environment, including all interactions with biotic and abiotic factors.
Correct Answer: B — Niche
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Q. What term describes the variety of life in the world or in a particular habitat? (2021)
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A.
Ecosystem
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B.
Biodiversity
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C.
Population
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D.
Community
Solution
Biodiversity refers to the variety of life in the world or in a particular habitat.
Correct Answer: B — Biodiversity
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Q. What term is used to describe the scientific study of living organisms? (2022)
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A.
Biology
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B.
Zoology
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C.
Botany
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D.
Ecology
Solution
Biology is the scientific study of living organisms, encompassing various sub-disciplines such as zoology and botany.
Correct Answer: A — Biology
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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 adsorption is characterized by the formation of strong chemical bonds?
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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 strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of adsorption occurs when the adsorbate forms strong chemical bonds with the adsorbent?
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A.
Physisorption
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B.
Chemisorption
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C.
Desorption
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D.
Sorption
Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the adsorbent.
Correct Answer: B — Chemisorption
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Q. What type of alcohol is isopropanol?
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A.
Primary
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B.
Secondary
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C.
Tertiary
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D.
None of the above
Solution
Isopropanol (2-propanol) is a secondary alcohol, as the hydroxyl group is attached to a carbon that is connected to two other carbons.
Correct Answer: B — Secondary
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Q. What type of biomolecule are enzymes classified as?
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A.
Carbohydrates
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B.
Proteins
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C.
Lipids
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D.
Nucleic acids
Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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Q. What type of biomolecule are enzymes? (2019)
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A.
Carbohydrates
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B.
Proteins
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C.
Lipids
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D.
Nucleic acids
Solution
Enzymes are primarily proteins that catalyze biochemical reactions.
Correct Answer: B — Proteins
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Q. What type of biomolecule is insulin?
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A.
Carbohydrate
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B.
Lipid
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C.
Protein
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D.
Nucleic acid
Solution
Insulin is a protein hormone that regulates glucose levels in the blood.
Correct Answer: C — Protein
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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 forms between the carboxyl group of one amino acid and the amino group of another?
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A.
Hydrogen bond
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B.
Ionic bond
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C.
Peptide bond
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D.
Disulfide bond
Solution
A peptide bond forms between the carboxyl group of one amino acid and the amino group of another, linking them together in a protein.
Correct Answer: C — Peptide bond
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Q. What type of bond is formed between amino acids in a protein?
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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.
Van der Waals forces
Solution
A covalent bond, specifically a peptide bond, is formed between amino acids in a protein.
Correct Answer: B — Covalent bond
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