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)
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A.
Fossil records
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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 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 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 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 reactions is an example of a disproportionation reaction? (2023)
-
A.
2H2O2 → 2H2O + O2
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B.
2Na + Cl2 → 2NaCl
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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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Q. Which of the following solids has a high thermal conductivity? (2019)
-
A.
Ionic solids
-
B.
Covalent solids
-
C.
Metallic solids
-
D.
Molecular solids
Solution
Metallic solids have high thermal conductivity due to the presence of free-moving electrons.
Correct Answer: C — Metallic solids
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Q. Which of the following species can act as an oxidizing agent? (2023)
-
A.
Na+
-
B.
Cl-
-
C.
H2O
-
D.
MnO4-
Solution
MnO4- is a strong oxidizing agent because it can gain electrons and be reduced to Mn2+.
Correct Answer: D — MnO4-
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Q. Which of the following species is the strongest oxidizing agent? (2023)
-
A.
F2
-
B.
Cl2
-
C.
Br2
-
D.
I2
Solution
F2 is the strongest oxidizing agent among the halogens due to its high electronegativity and ability to gain electrons.
Correct Answer: A — F2
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Q. Which of the following statements about alcohols is correct? (2022)
-
A.
They are all soluble in water.
-
B.
They have higher boiling points than alkanes.
-
C.
They cannot form hydrogen bonds.
-
D.
They are all volatile.
Solution
Alcohols have higher boiling points than alkanes due to the presence of hydrogen bonding.
Correct Answer: B — They have higher boiling points than alkanes.
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Q. Which of the following statements about alcohols is incorrect? (2022)
-
A.
They can form hydrogen bonds.
-
B.
They are generally soluble in water.
-
C.
They have higher boiling points than alkanes.
-
D.
All alcohols are volatile.
Solution
Not all alcohols are volatile; for example, long-chain alcohols have lower volatility.
Correct Answer: D — All alcohols are volatile.
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Q. Which of the following statements about chemisorption is true? (2022)
-
A.
It is a reversible process
-
B.
It involves the formation of strong chemical bonds
-
C.
It occurs at low temperatures
-
D.
It is independent of the nature of the adsorbate
Solution
Chemisorption involves the formation of strong chemical bonds between the adsorbate and the surface, making it generally irreversible.
Correct Answer: B — It involves the formation of strong chemical bonds
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Q. Which of the following statements about evolution is true? (2000)
-
A.
Evolution is a linear process.
-
B.
Evolution can occur in response to environmental changes.
-
C.
All traits are adaptive.
-
D.
Evolution results in perfect organisms.
Solution
Evolution can occur in response to environmental changes, allowing species to adapt to new conditions over time.
Correct Answer: B — Evolution can occur in response to environmental changes.
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