Q. What is the role of the filament in a flower? (2022)
A.
To support the anther
B.
To attract pollinators
C.
To produce ovules
D.
To receive pollen
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Solution
The filament is the stalk that supports the anther, which produces pollen.
Correct Answer:
A
— To support the anther
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Q. What is the role of the galvanometer in a potentiometer circuit?
A.
To measure current
B.
To measure resistance
C.
To indicate the balance point
D.
To provide a reference voltage
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Solution
The galvanometer indicates the balance point in a potentiometer circuit, showing when the potential difference across the wire equals the unknown voltage.
Correct Answer:
C
— To indicate the balance point
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Q. What is the role of the galvanometer in a Wheatstone bridge?
A.
To measure voltage
B.
To measure current
C.
To detect balance
D.
To provide power
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Solution
The galvanometer is used to detect whether the bridge is balanced or unbalanced.
Correct Answer:
C
— To detect balance
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Q. What is the role of the Golgi apparatus in the cell?
A.
Energy production
B.
Modification and packaging of proteins
C.
Cell division
D.
Photosynthesis
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Solution
The Golgi apparatus modifies, sorts, and packages proteins for secretion or use within the cell.
Correct Answer:
B
— Modification and packaging of proteins
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Q. What is the role of the immune system? (2022)
A.
Digest food
B.
Transport nutrients
C.
Fight diseases
D.
Regulate hormones
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Solution
The immune system's role is to fight diseases and protect the body from infections.
Correct Answer:
C
— Fight diseases
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Q. What is the role of the jockey in a potentiometer setup?
A.
To connect the circuit
B.
To measure current
C.
To find the balance point
D.
To provide a fixed voltage
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Solution
The jockey is used to find the balance point in the potentiometer setup by sliding along the wire.
Correct Answer:
C
— To find the balance point
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Q. What is the role of the jockey in a potentiometer?
A.
To measure current
B.
To connect the circuit
C.
To find the null point
D.
To provide a reference voltage
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Solution
The jockey is used to find the null point where the potential difference is balanced, indicating the measurement of the unknown voltage.
Correct Answer:
C
— To find the null point
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Q. What is the role of the loop of Henle in the nephron? (2023)
A.
Reabsorption of water
B.
Secretion of urea
C.
Filtration of blood
D.
Regulation of pH
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Solution
The loop of Henle plays a crucial role in the reabsorption of water and salts, helping to concentrate urine.
Correct Answer:
A
— Reabsorption of water
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Q. What is the role of the lymphatic system in the human body? (2023)
A.
Transporting oxygen
B.
Removing waste products
C.
Regulating blood pressure
D.
Transporting lymph and immune cells
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Solution
The lymphatic system is responsible for transporting lymph, which contains immune cells, and helps in the removal of waste products from tissues.
Correct Answer:
D
— Transporting lymph and immune cells
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Q. What is the role of the M checkpoint in the cell cycle? (2023)
A.
To check for DNA damage
B.
To ensure chromosomes are properly aligned
C.
To initiate DNA replication
D.
To signal the end of cytokinesis
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Solution
The M checkpoint ensures that all chromosomes are properly aligned at the metaphase plate before the cell proceeds to anaphase.
Correct Answer:
B
— To ensure chromosomes are properly aligned
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Q. What is the role of the ovary in a flower? (2022)
A.
Produces nectar
B.
Contains ovules
C.
Supports the anther
D.
Attracts insects
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Solution
The ovary is the part of the flower that contains ovules, which develop into seeds after fertilization.
Correct Answer:
B
— Contains ovules
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Q. What is the role of the ovary in the female reproductive system? (2021)
A.
Production of sperm
B.
Production of eggs
C.
Fertilization of eggs
D.
Nourishment of the fetus
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Solution
The ovary's primary role in the female reproductive system is the production of eggs (ova) which are necessary for reproduction.
Correct Answer:
B
— Production of eggs
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Q. What is the role of the pancreas in digestion? (2023)
A.
Secretes bile
B.
Produces digestive enzymes
C.
Absorbs nutrients
D.
Stores food
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Solution
The pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.
Correct Answer:
B
— Produces digestive enzymes
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Q. What is the role of the phase change upon reflection in thin film interference?
A.
It enhances constructive interference
B.
It enhances destructive interference
C.
It has no effect
D.
It changes the wavelength
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Solution
A phase change of π (or half a wavelength) occurs upon reflection from a medium of higher refractive index, affecting the interference pattern.
Correct Answer:
B
— It enhances destructive interference
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Q. What is the role of the plasma membrane? (2021)
A.
Energy production
B.
Transport of substances
C.
Protein synthesis
D.
Genetic information storage
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Solution
The plasma membrane regulates the transport of substances in and out of the cell.
Correct Answer:
B
— Transport of substances
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Q. What is the role of the refractive index in thin film interference?
A.
It determines the wavelength of light
B.
It affects the phase change upon reflection
C.
It has no effect
D.
It only affects the intensity
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Solution
The refractive index affects the phase change upon reflection; a higher refractive index can lead to a phase change of π (180 degrees).
Correct Answer:
B
— It affects the phase change upon reflection
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Q. What is the role of the respiratory system?
A.
To break down food
B.
To exchange gases
C.
To circulate blood
D.
To protect against pathogens
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Solution
The respiratory system is responsible for the exchange of gases, primarily oxygen and carbon dioxide, between the body and the environment.
Correct Answer:
B
— To exchange gases
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Q. What is the role of the spleen in the human body? (2021)
A.
Production of insulin
B.
Filtration of blood
C.
Digestion of food
D.
Respiration
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Solution
The spleen plays a crucial role in filtering blood and removing old or damaged red blood cells.
Correct Answer:
B
— Filtration of blood
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Q. What is the role of the stigma in a flower? (2019)
A.
To produce ovules
B.
To receive pollen
C.
To support the flower
D.
To attract insects
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Solution
The stigma is the part of the pistil that receives pollen during fertilization.
Correct Answer:
B
— To receive pollen
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Q. What is the role of the synapse in neural communication? (2022)
A.
To generate action potentials
B.
To connect two neurons
C.
To insulate the axon
D.
To store neurotransmitters
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Solution
The synapse is the junction between two neurons where neurotransmitters are released to facilitate communication.
Correct Answer:
B
— To connect two neurons
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Q. What is the role of the synaptic cleft? (2022)
A.
To connect two neurons
B.
To store neurotransmitters
C.
To facilitate the transmission of signals between neurons
D.
To protect the neuron from damage
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Solution
The synaptic cleft is the gap between two neurons that allows neurotransmitters to transmit signals.
Correct Answer:
C
— To facilitate the transmission of signals between neurons
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Q. What is the role of the synovial fluid in joints? (2022)
A.
Provides nutrients to cartilage
B.
Acts as a lubricant
C.
Absorbs shock
D.
All of the above
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Solution
Synovial fluid serves multiple functions including lubrication, nutrient supply, and shock absorption in joints.
Correct Answer:
D
— All of the above
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Q. What is the role of vaccines in health? (2023)
A.
Cure diseases
B.
Prevent diseases
C.
Diagnose diseases
D.
None of the above
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Solution
Vaccines are used to prevent diseases by stimulating the immune system.
Correct Answer:
B
— Prevent diseases
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Q. What is the role of xylem in plants?
A.
Transport of nutrients
B.
Transport of water
C.
Photosynthesis
D.
Storage of food
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Solution
Xylem is responsible for the transport of water and dissolved minerals from the roots to the rest of the plant.
Correct Answer:
B
— Transport of water
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Q. What is the role of yeast in baking? (2022)
A.
Fermentation
B.
Decomposition
C.
Photosynthesis
D.
Respiration
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Solution
Yeast ferments sugars to produce carbon dioxide, which helps the dough rise in baking.
Correct Answer:
A
— Fermentation
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Q. What is the root mean square (RMS) value of an alternating current (AC) if its peak value is 10 A?
A.
5 A
B.
7.07 A
C.
10 A
D.
14.14 A
Show solution
Solution
The RMS value of an AC is given by I_rms = I_peak / √2. Therefore, I_rms = 10 A / √2 = 7.07 A.
Correct Answer:
B
— 7.07 A
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Q. What is the root mean square (RMS) value of an alternating current (AC) that has a peak value of 10 A?
A.
5 A
B.
7.07 A
C.
10 A
D.
14.14 A
Show solution
Solution
The RMS value of an AC is given by I_rms = I_peak / √2. Therefore, I_rms = 10 A / √2 = 7.07 A.
Correct Answer:
B
— 7.07 A
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Q. What is the root mean square speed of gas molecules at a temperature T? (2021)
A.
√(3RT/M)
B.
√(RT/M)
C.
√(2RT/M)
D.
√(3kT/m)
Show solution
Solution
The root mean square speed (v_rms) of gas molecules is given by the formula v_rms = √(3RT/M), where R is the universal gas constant, T is the temperature, and M is the molar mass.
Correct Answer:
A
— √(3RT/M)
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Q. What is the root mean square speed of gas molecules at temperature T?
A.
(3RT/M)^0.5
B.
(RT/M)^0.5
C.
(2RT/M)^0.5
D.
(RT/3M)^0.5
Show solution
Solution
The root mean square speed (v_rms) is given by the formula v_rms = (3RT/M)^0.5, where R is the gas constant, T is the temperature, and M is the molar mass.
Correct Answer:
A
— (3RT/M)^0.5
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Q. What is the root mean square speed of gas molecules directly proportional to?
A.
The square root of the temperature.
B.
The square of the temperature.
C.
The mass of the gas molecules.
D.
The volume of the gas.
Show solution
Solution
The root mean square speed of gas molecules is directly proportional to the square root of the absolute temperature, as given by the equation v_rms = sqrt(3kT/m).
Correct Answer:
A
— The square root of the temperature.
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