Q. In the reaction 2MnO4⁻ + 5C2O4²⁻ + 16H⁺ → 2Mn²⁺ + 10CO2 + 8H2O, which species is reduced? (2019)
A.
MnO4⁻
B.
C2O4²⁻
C.
H⁺
D.
CO2
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Solution
In this reaction, MnO4⁻ is reduced to Mn²⁺ as it gains electrons.
Correct Answer: A — MnO4⁻
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if H2 is removed from the system, what will happen to the equilibrium? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
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Solution
Removing H2 will shift the equilibrium to the left to produce more H2, according to Le Chatelier's principle.
Correct Answer: B — Shift to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what is the effect of increasing the concentration of CO? (2023)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kp
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Solution
Increasing the concentration of CO will shift the equilibrium to the right, favoring the formation of CH3OH.
Correct Answer: A — Shift to the right
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Q. In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized? (2022)
A.
Zn
B.
Cu²⁺
C.
Zn²⁺
D.
Cu
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Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn²⁺.
Correct Answer: A — Zn
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Q. In thermodynamics, the term 'enthalpy' is defined as: (2022)
A.
The total energy of a system
B.
The heat content of a system at constant pressure
C.
The work done by a system
D.
The change in internal energy
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Solution
Enthalpy is defined as the heat content of a system at constant pressure, represented as H = U + PV.
Correct Answer: B — The heat content of a system at constant pressure
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Q. In thermodynamics, the term 'system' refers to: (2022)
A.
The surroundings
B.
The part of the universe under study
C.
The entire universe
D.
None of the above
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Solution
In thermodynamics, the 'system' refers to the part of the universe that is being studied, while the surroundings are everything else.
Correct Answer: B — The part of the universe under study
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Q. In thermodynamics, what does the term 'enthalpy' (H) represent? (2020)
A.
Total energy of the system
B.
Energy required to break bonds
C.
Heat content of the system at constant pressure
D.
Work done by the system
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Solution
Enthalpy (H) represents the heat content of the system at constant pressure, defined as H = U + PV.
Correct Answer: C — Heat content of the system at constant pressure
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Q. In thin film interference, which of the following will not affect the interference pattern? (2022)
A.
Thickness of the film
B.
Wavelength of light
C.
Angle of incidence
D.
Color of the light source
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Solution
While thickness, wavelength, and angle of incidence affect the interference pattern, the color of the light source does not directly affect the pattern itself.
Correct Answer: D — Color of the light source
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Q. In which case does total internal reflection occur? (2022)
A.
When light travels from a denser to a rarer medium
B.
When light travels from a rarer to a denser medium
C.
At the critical angle
D.
None of the above
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Solution
Total internal reflection occurs when light travels from a denser medium to a rarer medium at an angle greater than the critical angle.
Correct Answer: A — When light travels from a denser to a rarer medium
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Q. In which direction does the magnetic field point inside a solenoid carrying current? (2023)
A.
From south to north
B.
From north to south
C.
Perpendicular to the axis
D.
It is zero
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Solution
Inside a solenoid, the magnetic field lines run from the north pole to the south pole, similar to a bar magnet.
Correct Answer: B — From north to south
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Q. In which group of plants do we find true roots, stems, and leaves? (2021)
A.
Bryophytes
B.
Pteridophytes
C.
Algae
D.
Fungi
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Solution
Pteridophytes possess true roots, stems, and leaves, distinguishing them from bryophytes.
Correct Answer: B — Pteridophytes
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Q. In which group of plants do you find the presence of true leaves, stems, and roots? (2020)
A.
Bryophytes
B.
Pteridophytes
C.
Gymnosperms
D.
Algae
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Solution
Pteridophytes are the first group of plants that possess true leaves, stems, and roots.
Correct Answer: B — Pteridophytes
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Q. In which group of plants do you find true roots, stems, and leaves? (2020)
A.
Bryophytes
B.
Pteridophytes
C.
Gymnosperms
D.
All of the above
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Solution
Gymnosperms and pteridophytes both have true roots, stems, and leaves, while bryophytes do not.
Correct Answer: D — All of the above
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Q. In which kingdom would you classify mushrooms? (2022)
A.
Animalia
B.
Plantae
C.
Fungi
D.
Protista
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Solution
Mushrooms are classified in the kingdom Fungi, which includes all fungi, including yeasts and molds.
Correct Answer: C — Fungi
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Q. In which of the following conditions does the entropy of a system increase? (2022)
A.
When a gas is compressed
B.
When a solid melts
C.
When a liquid freezes
D.
When a gas is cooled
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Solution
The entropy of a system increases when a solid melts into a liquid, as the disorder of the system increases.
Correct Answer: B — When a solid melts
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Q. In which of the following does external fertilization occur? (2019)
A.
Frogs
B.
Humans
C.
Birds
D.
Reptiles
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Solution
Frogs typically exhibit external fertilization, where eggs and sperm are released into the water.
Correct Answer: A — Frogs
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Q. In which of the following organisms does binary fission occur? (2019)
A.
Yeast
B.
Amoeba
C.
Hydra
D.
Starfish
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Solution
Binary fission is a form of asexual reproduction commonly seen in unicellular organisms like Amoeba.
Correct Answer: B — Amoeba
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Q. In which of the following organisms does external fertilization occur? (2021)
A.
Frog
B.
Human
C.
Dog
D.
Cat
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Solution
Frogs exhibit external fertilization where eggs and sperm are released into the water.
Correct Answer: A — Frog
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Q. In which of the following processes is the enthalpy change (ΔH) equal to the heat absorbed at constant pressure? (2019)
A.
Isothermal process
B.
Isochoric process
C.
Isobaric process
D.
Adiabatic process
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Solution
In an isobaric process, the enthalpy change (ΔH) is equal to the heat absorbed or released at constant pressure.
Correct Answer: C — Isobaric process
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Q. In which of the following processes is the enthalpy change equal to the heat absorbed by the system at constant pressure? (2019)
A.
Isothermal process
B.
Isochoric process
C.
Isobaric process
D.
Adiabatic process
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Solution
In an isobaric process, the enthalpy change is equal to the heat absorbed by the system at constant pressure.
Correct Answer: C — Isobaric process
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Q. In which part of the chloroplast does the Calvin cycle take place? (2019)
A.
Thylakoid membrane
B.
Stroma
C.
Granum
D.
Outer membrane
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Solution
The Calvin cycle takes place in the stroma of the chloroplast.
Correct Answer: B — Stroma
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Q. In which part of the flower does fertilization occur? (2019)
A.
Stamen
B.
Ovary
C.
Style
D.
Petal
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Solution
Fertilization occurs in the ovary, where the male gamete from the pollen fuses with the female gamete in the ovule.
Correct Answer: B — Ovary
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Q. In which part of the plant does most of the photosynthesis occur?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
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Solution
Most of the photosynthesis occurs in the leaves, where chloroplasts are abundant.
Correct Answer: C — Leaves
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Q. In which part of the plant does most of the respiration occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
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Solution
Most of the respiration occurs in the roots, where energy is needed for nutrient uptake and growth.
Correct Answer: A — Roots
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Q. In which part of the plant does most respiration occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
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Solution
Most respiration occurs in the roots, where energy is needed for nutrient uptake and growth.
Correct Answer: A — Roots
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Q. In which part of the plant does most transpiration occur?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
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Solution
Most transpiration occurs in the leaves, where stomata are located to facilitate gas exchange and water loss.
Correct Answer: C — Leaves
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Q. In which part of the plant does most water absorption occur?
A.
Leaves
B.
Stems
C.
Roots
D.
Flowers
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Solution
Most water absorption occurs in the roots, where root hairs increase the surface area for absorption.
Correct Answer: C — Roots
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Q. In which part of the plant does respiration primarily occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
All parts
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Solution
Respiration occurs in all parts of the plant, including roots, leaves, and stems.
Correct Answer: D — All parts
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Q. In which part of the plant does the majority of photosynthesis occur?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
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Solution
Leaves are the primary site of photosynthesis due to the presence of chlorophyll in chloroplasts.
Correct Answer: C — Leaves
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Q. In which phase do sister chromatids separate and move to opposite poles of the cell? (2019)
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Telophase
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Solution
During Anaphase, sister chromatids are pulled apart and move towards opposite poles of the cell.
Correct Answer: C — Anaphase
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