Q. What is the work done when a force of 15 N moves an object 4 m in the direction of the force?
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A.
60 J
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B.
30 J
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C.
45 J
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D.
75 J
Solution
Work done = Force × Distance = 15 N × 4 m = 60 J
Correct Answer: A — 60 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 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 2x - 3y + 6 = 0? (2023)
Solution
Rearranging gives y = (2/3)x + 2; y-intercept = 2
Correct Answer: A — 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 is the y-intercept of the line 4x + 5y - 20 = 0?
Solution
Setting x = 0 in the equation gives 5y = 20, thus y = 4. The y-intercept is 4.
Correct Answer: B — 5
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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 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 process by which unrelated organisms evolve similar traits? (1970)
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A.
Convergent Evolution
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B.
Divergent Evolution
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C.
Adaptive Radiation
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D.
Co-evolution
Solution
Convergent evolution occurs when unrelated organisms evolve similar traits due to similar environmental pressures.
Correct Answer: A — Convergent Evolution
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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
-
B.
Niche
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C.
Biome
-
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)
-
A.
Habitat
-
B.
Niche
-
C.
Biome
-
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 a particular habitat or ecosystem? (2022)
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A.
Genetic diversity
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B.
Species diversity
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C.
Ecosystem diversity
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D.
Biodiversity
Solution
Species diversity refers to the variety of life in a particular habitat or ecosystem.
Correct Answer: B — Species diversity
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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
-
B.
Biodiversity
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C.
Population
-
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 term is used to describe the variety of life in the world or in a particular habitat or ecosystem? (2022)
-
A.
Biodiversity
-
B.
Ecology
-
C.
Biology
-
D.
Genetics
Solution
Biodiversity refers to the variety of life in the world or in a particular habitat or ecosystem.
Correct Answer: A — Biodiversity
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Q. What type of adsorption is characterized by a low heat of adsorption, typically less than 40 kJ/mol? (2023)
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A.
Physisorption
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B.
Chemisorption
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C.
Multilayer adsorption
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D.
Surface reaction
Solution
Physisorption is characterized by a low heat of adsorption, typically less than 40 kJ/mol, due to weak van der Waals forces.
Correct Answer: A — Physisorption
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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 amine is formed when ammonia reacts with an alkyl halide? (2022)
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A.
Primary amine
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B.
Secondary amine
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C.
Tertiary amine
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D.
Quaternary ammonium salt
Solution
The reaction of ammonia with an alkyl halide initially forms a primary amine.
Correct Answer: A — Primary amine
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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
-
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 DNA? (2022)
-
A.
Protein
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B.
Carbohydrate
-
C.
Lipid
-
D.
Nucleic acid
Solution
DNA is classified as a nucleic acid, which stores and transmits genetic information.
Correct Answer: D — Nucleic acid
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Q. What type of biomolecule is RNA? (2014)
-
A.
Protein
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B.
Carbohydrate
-
C.
Nucleic Acid
-
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 between two atoms that share electrons? (2022)
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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.
Correct Answer: B — Covalent 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
-
C.
Metallic bond
-
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
-
A.
Ionic bond
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B.
Covalent bond
-
C.
Metallic bond
-
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
-
C.
Triple bond
-
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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