Q. Which ion is primarily responsible for depolarization during an action potential? (2023)
A.
Sodium (Na+)
B.
Potassium (K+)
C.
Calcium (Ca2+)
D.
Chloride (Cl-)
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Solution
Sodium ions (Na+) rush into the neuron during depolarization, causing the membrane potential to become more positive.
Correct Answer: A — Sodium (Na+)
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Q. Which ion is primarily responsible for the depolarization phase of an action potential? (2023)
A.
Sodium (Na+)
B.
Potassium (K+)
C.
Calcium (Ca2+)
D.
Chloride (Cl-)
Show solution
Solution
Sodium ions (Na+) rush into the neuron during depolarization, causing the membrane potential to become more positive.
Correct Answer: A — Sodium (Na+)
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Q. Which isotope of hydrogen is also known as deuterium? (2021)
A.
Protium
B.
Tritium
C.
Hydrogen-1
D.
Hydrogen-2
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Solution
Deuterium is the isotope of hydrogen with one neutron, also referred to as Hydrogen-2.
Correct Answer: D — Hydrogen-2
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Q. Which isotope of hydrogen is also known as heavy hydrogen? (2020)
A.
Protium
B.
Deuterium
C.
Tritium
D.
Hydrogen-1
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Solution
Deuterium is known as heavy hydrogen because it has one neutron in addition to the single proton.
Correct Answer: B — Deuterium
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Q. Which kingdom includes organisms that are unicellular and prokaryotic? (2019)
A.
Plantae
B.
Animalia
C.
Fungi
D.
Monera
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Solution
The kingdom Monera includes unicellular and prokaryotic organisms.
Correct Answer: D — Monera
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Q. Which kingdom is characterized by organisms that are multicellular and autotrophic? (2022)
A.
Animalia
B.
Fungi
C.
Plantae
D.
Monera
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Solution
The kingdom Plantae is characterized by multicellular and autotrophic organisms.
Correct Answer: C — Plantae
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Q. Which kingdom is characterized by organisms that are primarily autotrophic? (2021)
A.
Animalia
B.
Fungi
C.
Plantae
D.
Monera
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Solution
The kingdom Plantae is characterized by autotrophic organisms that perform photosynthesis.
Correct Answer: C — Plantae
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Q. Which law relates the magnetic field around a conductor to the current flowing through it? (2023)
A.
Faraday's Law
B.
Ampere's Law
C.
Ohm's Law
D.
Lenz's Law
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Solution
Ampere's Law relates the magnetic field around a conductor to the current flowing through it.
Correct Answer: B — Ampere's Law
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Q. Which law states that energy cannot be created or destroyed, only transformed? (2021)
A.
Zeroth Law
B.
First Law
C.
Second Law
D.
Third Law
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Solution
The First Law of Thermodynamics states that energy cannot be created or destroyed, only transformed.
Correct Answer: B — First Law
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Q. Which law states that for every action, there is an equal and opposite reaction? (2022)
A.
Newton's First Law
B.
Newton's Second Law
C.
Newton's Third Law
D.
Law of Conservation of Momentum
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Solution
Newton's Third Law states that for every action, there is an equal and opposite reaction.
Correct Answer: C — Newton's Third Law
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Q. Which law states that the current through a conductor between two points is directly proportional to the voltage across the two points? (2021)
A.
Ohm's Law
B.
Kirchhoff's Law
C.
Faraday's Law
D.
Ampere's Law
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Solution
Ohm's Law states that the current (I) through a conductor is directly proportional to the voltage (V) across it, given by the formula V = IR.
Correct Answer: A — Ohm's Law
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Q. Which law states that the entropy of an isolated system always increases? (2021)
A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
Third law of thermodynamics
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Solution
The second law of thermodynamics states that the entropy of an isolated system will always increase over time.
Correct Answer: C — Second law of thermodynamics
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Q. Which law states that the entropy of an isolated system never decreases? (2021)
A.
Zeroth law of thermodynamics
B.
First law of thermodynamics
C.
Second law of thermodynamics
D.
Third law of thermodynamics
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Solution
The second law of thermodynamics states that the entropy of an isolated system never decreases over time.
Correct Answer: C — Second law of thermodynamics
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Q. Which law states that the heat absorbed or released by a substance is proportional to the change in temperature? (2021)
A.
Boyle's Law
B.
Charles's Law
C.
Newton's Law of Cooling
D.
Calorimetry
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Solution
Calorimetry states that the heat absorbed or released by a substance is proportional to the change in temperature.
Correct Answer: D — Calorimetry
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Q. Which law states that the induced electromotive force (emf) in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law states that the induced emf in a closed loop is equal to the negative rate of change of magnetic flux through the loop.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced electromotive force is proportional to the rate of change of magnetic flux? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law of electromagnetic induction states that the induced electromotive force in any closed circuit is equal to the rate of change of magnetic flux through the circuit.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced EMF in a circuit is proportional to the rate of change of magnetic flux through the circuit? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
Show solution
Solution
Faraday's Law states that the induced EMF is proportional to the rate of change of magnetic flux.
Correct Answer: A — Faraday's Law
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Q. Which law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop? (2022)
A.
Faraday's Law
B.
Lenz's Law
C.
Ohm's Law
D.
Ampere's Law
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Solution
Faraday's Law states that the induced EMF in a closed loop is equal to the negative rate of change of magnetic flux through the loop.
Correct Answer: A — Faraday's Law
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Q. Which law states that the pressure of a gas is directly proportional to its temperature at constant volume? (2019)
A.
Boyle's Law
B.
Charles's Law
C.
Gay-Lussac's Law
D.
Avogadro's Law
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Solution
Gay-Lussac's Law states that the pressure of a gas is directly proportional to its temperature at constant volume.
Correct Answer: C — Gay-Lussac's Law
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Q. Which law states that the rate of heat transfer through a material is proportional to the temperature difference? (2022)
A.
Newton's Law of Cooling
B.
Fourier's Law
C.
Stefan-Boltzmann Law
D.
Boyle's Law
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Solution
Fourier's Law states that the rate of heat transfer through a material is proportional to the temperature difference across it.
Correct Answer: B — Fourier's Law
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Q. Which law states that the total momentum of a closed system remains constant?
A.
Newton's First Law
B.
Newton's Second Law
C.
Conservation of Momentum
D.
Conservation of Energy
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Solution
The Conservation of Momentum states that in a closed system, the total momentum remains constant if no external forces act on it.
Correct Answer: C — Conservation of Momentum
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Q. Which macromolecule is primarily responsible for genetic information? (2020)
A.
Proteins
B.
Lipids
C.
Carbohydrates
D.
Nucleic Acids
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Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic Acids
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Q. Which macromolecule is primarily responsible for storing genetic information? (2020)
A.
Proteins
B.
Carbohydrates
C.
Lipids
D.
Nucleic acids
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Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which microbe is primarily responsible for the fermentation of vinegar? (2021)
A.
Yeast
B.
Lactic acid bacteria
C.
Acetic acid bacteria
D.
Molds
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Solution
Acetic acid bacteria are responsible for the fermentation process that converts alcohol into vinegar.
Correct Answer: C — Acetic acid bacteria
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Q. Which mineral is primarily involved in the formation of chlorophyll? (2019)
A.
Magnesium
B.
Calcium
C.
Phosphorus
D.
Sulfur
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Solution
Magnesium is a central component of the chlorophyll molecule, essential for photosynthesis.
Correct Answer: A — Magnesium
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Q. Which mineral is primarily involved in the synthesis of chlorophyll? (2019)
A.
Magnesium
B.
Calcium
C.
Phosphorus
D.
Iron
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Solution
Magnesium is a central component of the chlorophyll molecule, which is essential for photosynthesis.
Correct Answer: A — Magnesium
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Q. Which molecule has the highest electronegativity difference? (2021)
A.
HCl
B.
NaCl
C.
CO
D.
H2
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Solution
NaCl has the highest electronegativity difference between sodium and chlorine, leading to a strong ionic bond.
Correct Answer: B — NaCl
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Q. Which muscle is primarily responsible for the extension of the leg at the knee? (2022)
A.
Quadriceps femoris
B.
Hamstrings
C.
Gastrocnemius
D.
Sartorius
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Solution
The quadriceps femoris muscle is responsible for extending the leg at the knee joint.
Correct Answer: A — Quadriceps femoris
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Q. Which muscle is primarily responsible for the flexion of the forearm at the elbow? (2023)
A.
Biceps Brachii
B.
Brachialis
C.
Triceps Brachii
D.
Brachioradialis
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Solution
The biceps brachii is primarily responsible for flexing the forearm at the elbow joint.
Correct Answer: A — Biceps Brachii
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Q. Which muscle type is involuntary and found in the walls of internal organs? (2023)
A.
Skeletal muscle
B.
Cardiac muscle
C.
Smooth muscle
D.
Striated muscle
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Solution
Smooth muscle is involuntary and is found in the walls of internal organs, facilitating movements such as peristalsis.
Correct Answer: C — Smooth muscle
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