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 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 speed of gas molecules at a temperature T? (2021)
A.
√(3RT/M)
B.
√(RT/M)
C.
√(2RT/M)
D.
√(3kT/m)
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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 scientific name of the domestic cat? (2023)
A.
Canis lupus
B.
Felis catus
C.
Equus caballus
D.
Bos taurus
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Solution
The scientific name of the domestic cat is Felis catus, following the binomial nomenclature system.
Correct Answer: B — Felis catus
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Q. What is the scientific study of living organisms called? (2021)
A.
Botany
B.
Zoology
C.
Biology
D.
Ecology
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Solution
Biology is the scientific study of living organisms.
Correct Answer: C — Biology
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Q. What is the shape of a molecule with a tetrahedral geometry? (2023)
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Octahedral
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Solution
A tetrahedral geometry has a central atom bonded to four other atoms, forming a shape like a pyramid with a triangular base.
Correct Answer: C — Tetrahedral
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Q. What is the shape of the magnetic field lines around a circular loop of wire carrying current? (2021)
A.
Straight lines
B.
Concentric circles
C.
Ellipses
D.
Spirals
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Solution
The magnetic field lines around a circular loop of wire carrying current are in the shape of concentric circles, with the center of the loop being the point of maximum field strength.
Correct Answer: B — Concentric circles
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Q. What is the shape of the methane (CH4) molecule? (2023)
A.
Linear
B.
Trigonal planar
C.
Tetrahedral
D.
Octahedral
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Solution
Methane (CH4) has a tetrahedral shape due to the four pairs of bonding electrons around the central carbon atom.
Correct Answer: C — Tetrahedral
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Q. What is the shape of the s orbital? (2021) 2021
A.
Spherical
B.
Dumbbell
C.
Double dumbbell
D.
Linear
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Solution
The s orbital has a spherical shape.
Correct Answer: A — Spherical
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Q. What is the shear modulus of a material if a shear stress of 100 MPa produces a shear strain of 0.05? (2021)
A.
2000 MPa
B.
500 MPa
C.
1000 MPa
D.
1500 MPa
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Solution
Shear modulus (G) = Shear stress / Shear strain = 100 MPa / 0.05 = 2000 MPa.
Correct Answer: A — 2000 MPa
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Q. What is the shear modulus of a material if a shear stress of 100 MPa produces a shear strain of 0.02? (2022)
A.
5000 MPa
B.
2000 MPa
C.
1000 MPa
D.
2500 MPa
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Solution
Shear modulus (G) = Shear stress / Shear strain = 100 MPa / 0.02 = 5000 MPa.
Correct Answer: A — 5000 MPa
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Q. What is the SI unit of electric charge? (2020)
A.
Coulomb
B.
Ampere
C.
Volt
D.
Ohm
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Solution
The SI unit of electric charge is Coulomb (C).
Correct Answer: A — Coulomb
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Q. What is the SI unit of electric current? (2021)
A.
Volt
B.
Ohm
C.
Ampere
D.
Coulomb
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Solution
The SI unit of electric current is the Ampere (A).
Correct Answer: C — Ampere
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Q. What is the SI unit of magnetic field strength? (2023)
A.
Tesla
B.
Weber
C.
Henry
D.
Ampere
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Solution
The SI unit of magnetic field strength is the Tesla (T).
Correct Answer: A — Tesla
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Q. What is the SI unit of magnetic moment? (2023)
A.
Ampere-meter
B.
Tesla
C.
Joule per Tesla
D.
Newton per Ampere
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Solution
The SI unit of magnetic moment is Joule per Tesla (J/T), which can also be expressed as Ampere-meter squared (A·m²).
Correct Answer: C — Joule per Tesla
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Q. What is the significance of biodiversity hotspots? (2020)
A.
They are areas with high pollution levels.
B.
They are regions with a high number of endemic species.
C.
They are places with low human activity.
D.
They are regions with abundant resources.
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Solution
Biodiversity hotspots are significant because they are regions with a high number of endemic species and are under threat from human activities.
Correct Answer: B — They are regions with a high number of endemic species.
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Q. What is the significance of biopesticides in agriculture? (2020)
A.
They are more toxic than chemical pesticides
B.
They are derived from natural materials
C.
They require more application frequency
D.
They are less effective than traditional pesticides
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Solution
Biopesticides are derived from natural materials and are considered safer for the environment compared to chemical pesticides.
Correct Answer: B — They are derived from natural materials
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Q. What is the significance of bioremediation in biotechnology? (2023)
A.
Production of biofuels
B.
Waste management
C.
Food production
D.
Genetic engineering
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Solution
Bioremediation is significant in biotechnology as it involves the use of microorganisms to clean up contaminated environments, thus aiding in waste management.
Correct Answer: B — Waste management
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Q. What is the significance of Bt cotton? (2020)
A.
It is resistant to drought
B.
It produces its own insecticide
C.
It has higher nutritional value
D.
It grows faster than normal cotton
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Solution
Bt cotton is genetically modified to produce a toxin that is harmful to specific pests, reducing the need for chemical insecticides.
Correct Answer: B — It produces its own insecticide
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Q. What is the significance of prenatal care? (2023)
A.
To ensure the health of the mother and fetus
B.
To promote smoking during pregnancy
C.
To encourage unplanned pregnancies
D.
To avoid medical check-ups
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Solution
Prenatal care is crucial for monitoring the health of both the mother and the developing fetus, ensuring a healthy pregnancy.
Correct Answer: A — To ensure the health of the mother and fetus
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Q. What is the significance of significant figures in a measurement? (2019)
A.
They indicate the precision of the measurement
B.
They indicate the accuracy of the measurement
C.
They are used for unit conversion
D.
They are irrelevant
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Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: A — They indicate the precision of the measurement
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Q. What is the significance of significant figures in measurements? (2019)
A.
To indicate the precision of a measurement
B.
To show the accuracy of a measurement
C.
To represent the unit of measurement
D.
To determine the error in measurement
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Solution
Significant figures indicate the precision of a measurement, reflecting the certainty of the digits.
Correct Answer: A — To indicate the precision of a measurement
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Q. What is the significance of the 'Golden Gate' cloning method? (2023)
A.
It allows for the cloning of large DNA fragments
B.
It uses a single restriction enzyme for multiple insertions
C.
It is a method for sequencing DNA
D.
It enhances the stability of plasmids
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Solution
The 'Golden Gate' cloning method allows for the simultaneous insertion of multiple DNA fragments using a single restriction enzyme, making it efficient for constructing complex plasmids.
Correct Answer: B — It uses a single restriction enzyme for multiple insertions
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Q. What is the significance of the 'sticky ends' produced by restriction enzymes? (2023)
A.
They prevent DNA degradation
B.
They facilitate the ligation of DNA fragments
C.
They enhance transcription
D.
They stabilize the DNA structure
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Solution
Sticky ends are overhanging sequences produced by restriction enzymes that facilitate the ligation of DNA fragments by allowing complementary base pairing.
Correct Answer: B — They facilitate the ligation of DNA fragments
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Q. What is the significance of the electron transport chain in respiration? (2023)
A.
To produce glucose
B.
To generate ATP
C.
To release carbon dioxide
D.
To absorb oxygen
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Solution
The electron transport chain is significant in respiration as it generates ATP through oxidative phosphorylation.
Correct Answer: B — To generate ATP
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Q. What is the significance of the fossil record in understanding evolution?
A.
It provides direct evidence of genetic changes
B.
It shows the chronological order of species appearance
C.
It proves the theory of inheritance
D.
It eliminates the need for natural selection
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Solution
The fossil record is significant because it provides a chronological order of species appearance, helping to trace the evolutionary history of life on Earth.
Correct Answer: B — It shows the chronological order of species appearance
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Q. What is the significance of the G2 phase in the cell cycle? (2022)
A.
Preparation for mitosis
B.
DNA replication
C.
Cell growth
D.
Chromosome alignment
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Solution
The G2 phase is crucial for preparing the cell for mitosis, ensuring all DNA is replicated and the cell is ready to divide.
Correct Answer: A — Preparation for mitosis
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Q. What is the significance of the Heisenberg Uncertainty Principle in atomic physics? (2023)
A.
It defines the position of an electron
B.
It states that energy levels are quantized
C.
It limits the precision of measuring position and momentum
D.
It explains the stability of the nucleus
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Solution
The Heisenberg Uncertainty Principle states that it is impossible to simultaneously know the exact position and momentum of a particle.
Correct Answer: C — It limits the precision of measuring position and momentum
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