Q. Which of the following processes occurs in the thylakoid membranes of chloroplasts? (2020)
-
A.
Calvin cycle
-
B.
Light-dependent reactions
-
C.
Light-independent reactions
-
D.
Photorespiration
Solution
The light-dependent reactions of photosynthesis occur in the thylakoid membranes.
Correct Answer:
B
— Light-dependent reactions
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Q. Which of the following processes occurs in the thylakoid membranes? (2020)
-
A.
Calvin cycle
-
B.
Light-dependent reactions
-
C.
Light-independent reactions
-
D.
Photorespiration
Solution
The light-dependent reactions of photosynthesis occur in the thylakoid membranes.
Correct Answer:
B
— Light-dependent reactions
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Q. Which of the following properties is characteristic of covalent network solids? (2019)
-
A.
High electrical conductivity
-
B.
Brittleness
-
C.
Low melting points
-
D.
Solubility in water
Solution
Covalent network solids are typically brittle due to the strong covalent bonds that do not allow for easy deformation.
Correct Answer:
B
— Brittleness
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Q. Which of the following properties is characteristic of ionic solids? (2021)
-
A.
High electrical conductivity
-
B.
Low melting point
-
C.
Brittleness
-
D.
Malleability
Solution
Ionic solids are typically brittle due to the strong electrostatic forces between the ions, which cause them to shatter when force is applied.
Correct Answer:
C
— Brittleness
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Q. Which of the following properties is typical of metallic solids? (2019)
-
A.
Brittleness
-
B.
Electrical conductivity
-
C.
Low melting point
-
D.
Insulating nature
Solution
Metallic solids are known for their high electrical conductivity due to the presence of free-moving electrons.
Correct Answer:
B
— Electrical conductivity
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Q. Which of the following provides evidence for evolution through common descent? (2010)
-
A.
Fossil records
-
B.
Homologous structures
-
C.
Vestigial organs
-
D.
All of the above
Solution
All of the above options provide evidence for evolution through common descent, showing how different species share common ancestors.
Correct Answer:
D
— All of the above
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Q. Which of the following quantities has dimensions of M^0L^2T^-2? (2021)
-
A.
Energy
-
B.
Pressure
-
C.
Area
-
D.
Velocity
Solution
Area has dimensions of M^0L^2T^-2.
Correct Answer:
C
— Area
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Q. Which of the following quantities has no dimension? (2023)
-
A.
Angle
-
B.
Force
-
C.
Velocity
-
D.
Acceleration
Solution
Angle is a dimensionless quantity.
Correct Answer:
A
— Angle
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Q. Which of the following quantities has no dimensions? (2019)
-
A.
Force
-
B.
Energy
-
C.
Angle
-
D.
Pressure
Solution
Angle is a pure number and has no dimensions, while force, energy, and pressure all have dimensions.
Correct Answer:
C
— Angle
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Q. Which of the following quantities has the dimension M^0L^1T^-1? (2021)
-
A.
Velocity
-
B.
Acceleration
-
C.
Force
-
D.
Work
Solution
Velocity has the dimension M^0L^1T^-1.
Correct Answer:
A
— Velocity
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Q. Which of the following quantities has the dimension M^1L^2T^-2? (2019)
-
A.
Work
-
B.
Power
-
C.
Energy
-
D.
Force
Solution
Work has the dimension M^1L^2T^-2.
Correct Answer:
A
— Work
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Q. Which of the following quantities has the dimension [M^0 L^0 T^1]? (2022)
-
A.
Speed
-
B.
Time
-
C.
Force
-
D.
Energy
Solution
Time has the dimension [M^0 L^0 T^1].
Correct Answer:
B
— Time
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Q. Which of the following quantities is a vector? (2019)
-
A.
Speed
-
B.
Distance
-
C.
Displacement
-
D.
Mass
Solution
Displacement is a vector quantity as it has both magnitude and direction, while speed, distance, and mass are scalar quantities.
Correct Answer:
C
— Displacement
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Q. Which of the following quantities is conserved in an isolated system? (2023)
-
A.
Energy
-
B.
Momentum
-
C.
Mass
-
D.
All of the above
Solution
In an isolated system, energy, momentum, and mass are all conserved.
Correct Answer:
D
— All of the above
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Q. Which of the following quantities is not a scalar? (2021)
-
A.
Mass
-
B.
Temperature
-
C.
Velocity
-
D.
Speed
Solution
Velocity is a vector quantity as it has both magnitude and direction, while mass, temperature, and speed are scalar quantities.
Correct Answer:
C
— Velocity
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Q. Which of the following quantum numbers describes the shape of an atomic orbital? (2022)
-
A.
Principal quantum number
-
B.
Azimuthal quantum number
-
C.
Magnetic quantum number
-
D.
Spin quantum number
Solution
The azimuthal quantum number (l) describes the shape of the atomic orbital.
Correct Answer:
B
— Azimuthal quantum number
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Q. Which of the following quantum numbers describes the shape of an orbital? (2020) 2020
-
A.
Principal quantum number
-
B.
Azimuthal quantum number
-
C.
Magnetic quantum number
-
D.
Spin quantum number
Solution
The azimuthal quantum number (l) describes the shape of an orbital.
Correct Answer:
B
— Azimuthal quantum number
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Q. Which of the following reactions involves a redox process? (2019)
-
A.
H2 + Cl2 → 2HCl
-
B.
NaCl → Na + Cl2
-
C.
CaCO3 → CaO + CO2
-
D.
H2O → H2 + O2
Solution
H2O → H2 + O2 involves the oxidation of water to hydrogen and oxygen, making it a redox reaction.
Correct Answer:
D
— H2O → H2 + O2
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Q. Which of the following reactions is a reduction? (2020)
-
A.
Fe2O3 + 3CO → 2Fe + 3CO2
-
B.
2H2 + O2 → 2H2O
-
C.
2Na + Cl2 → 2NaCl
-
D.
C + O2 → CO2
Solution
In the reaction Fe2O3 + 3CO → 2Fe + 3CO2, iron (Fe) is reduced as it gains electrons from carbon monoxide (CO).
Correct Answer:
A
— Fe2O3 + 3CO → 2Fe + 3CO2
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Q. Which of the following reactions is an example of a disproportionation reaction? (2023)
-
A.
2H2O2 → 2H2O + O2
-
B.
2Na + Cl2 → 2NaCl
-
C.
Zn + CuSO4 → ZnSO4 + Cu
-
D.
Fe + 2HCl → FeCl2 + H2
Solution
In the reaction 2H2O2 → 2H2O + O2, the oxidation state of oxygen changes from -1 in H2O2 to 0 in O2, indicating that it is both oxidized and reduced.
Correct Answer:
A
— 2H2O2 → 2H2O + O2
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Q. Which of the following reactions is an example of a redox reaction? (2023)
-
A.
H2 + Cl2 → 2HCl
-
B.
NaOH + HCl → NaCl + H2O
-
C.
CaCO3 → CaO + CO2
-
D.
C + O2 → CO2
Solution
The reaction C + O2 → CO2 is a redox reaction because carbon is oxidized and oxygen is reduced.
Correct Answer:
D
— C + O2 → CO2
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Q. Which of the following reactions is an example of hydrogenation? (2023)
-
A.
Addition of H2 to ethene
-
B.
Decomposition of water
-
C.
Formation of ammonia from nitrogen and hydrogen
-
D.
Combustion of hydrogen
Solution
Hydrogenation refers to the addition of hydrogen (H2) to unsaturated hydrocarbons, such as the addition to ethene to form ethane.
Correct Answer:
A
— Addition of H2 to ethene
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Q. Which of the following reactions is characteristic of aldehydes? (2023)
-
A.
Oxidation to carboxylic acids
-
B.
Reduction to alcohols
-
C.
Condensation with alcohols
-
D.
All of the above
Solution
Aldehydes can undergo oxidation to form carboxylic acids, reduction to form alcohols, and condensation with alcohols to form hemiacetals.
Correct Answer:
D
— All of the above
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Q. Which of the following represents a homozygous dominant genotype? (2021)
Solution
The genotype 'AA' represents a homozygous dominant individual.
Correct Answer:
A
— AA
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Q. Which of the following represents a phenotype? (2021)
-
A.
BB
-
B.
Bb
-
C.
bb
-
D.
Brown eyes
Solution
A phenotype is the observable characteristic, such as brown eyes.
Correct Answer:
D
— Brown eyes
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Q. Which of the following represents a systematic error? (2020)
-
A.
Calibration error
-
B.
Random fluctuations
-
C.
Environmental changes
-
D.
Human error
Solution
Systematic errors are consistent and repeatable inaccuracies, often due to calibration errors.
Correct Answer:
A
— Calibration error
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Q. Which of the following represents a test cross? (2020)
-
A.
AA x aa
-
B.
Aa x Aa
-
C.
AA x Aa
-
D.
aa x aa
Solution
A test cross is performed by crossing an individual with a homozygous recessive individual (AA x aa) to determine the genotype of the former.
Correct Answer:
A
— AA x aa
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Q. Which of the following represents the concept of significant figures? (2023)
-
A.
All digits in a number
-
B.
Only the non-zero digits
-
C.
All digits except leading zeros
-
D.
All digits except trailing zeros
Solution
Significant figures include all non-zero digits and any zeros between them or trailing after a decimal point.
Correct Answer:
C
— All digits except leading zeros
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Q. Which of the following represents the ideal gas constant? (2022)
-
A.
R = 0.0821 L·atm/(K·mol)
-
B.
R = 8.314 J/(K·mol)
-
C.
Both A and B
-
D.
None of the above
Solution
The ideal gas constant can be represented as R = 0.0821 L·atm/(K·mol) or R = 8.314 J/(K·mol).
Correct Answer:
C
— Both A and B
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Q. Which of the following solids has a high degree of anisotropy? (2019)
-
A.
Ionic solids
-
B.
Covalent solids
-
C.
Metallic solids
-
D.
Molecular solids
Solution
Covalent solids exhibit a high degree of anisotropy due to their directional bonding.
Correct Answer:
B
— Covalent solids
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