Medical Entrance
Q. In a simple harmonic oscillator, if the mass is increased, what happens to the time period? (2019)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on amplitude
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Solution
Time period (T) = 2π√(m/k). If mass (m) increases, T increases.
Correct Answer: A — Increases
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Q. In a test cross, an individual of unknown genotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
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Solution
A test cross is performed by crossing an individual of unknown genotype with a homozygous recessive individual.
Correct Answer: C — Homozygous recessive
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Q. In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Homozygous recessive
C.
Heterozygous
D.
None of the above
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Solution
In a test cross, an individual with a dominant phenotype is crossed with a homozygous recessive individual to determine its genotype.
Correct Answer: B — Homozygous recessive
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Q. In a test cross, an individual with an unknown genotype is crossed with which of the following? (2023)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
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Solution
In a test cross, the individual with an unknown genotype is crossed with a homozygous recessive individual.
Correct Answer: C — Homozygous recessive
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Q. In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)
A.
Red
B.
Green
C.
Blue
D.
Violet
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Solution
Red light has the longest wavelength and is least affected by interference effects in thin films compared to shorter wavelengths.
Correct Answer: A — Red
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Q. In a thin film of oil on water, which color of light is most likely to be reflected? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
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Solution
Due to the phenomenon of thin film interference, the color that is most prominently reflected depends on the thickness of the film and the wavelength of light. Typically, blue light is more likely to be reflected due to shorter wavelengths.
Correct Answer: B — Blue
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Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 200 turns, what is the turns ratio? (2021)
A.
1:2
B.
2:1
C.
1:1
D.
3:1
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Solution
The turns ratio is 100:200, which simplifies to 1:2.
Correct Answer: A — 1:2
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Q. In a transformer, if the primary coil has 100 turns and the secondary coil has 50 turns, what is the turns ratio? (2023)
A.
2:1
B.
1:2
C.
1:1
D.
3:1
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Solution
The turns ratio is 2:1, as the primary has twice the number of turns compared to the secondary.
Correct Answer: A — 2:1
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Q. In a transformer, if the primary coil has more turns than the secondary coil, what type of transformer is it? (2021)
A.
Step-up transformer
B.
Step-down transformer
C.
Isolation transformer
D.
Auto transformer
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Solution
If the primary coil has more turns than the secondary coil, it is a step-down transformer.
Correct Answer: B — Step-down transformer
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Q. In an AC circuit, if the current lags the voltage by 30 degrees, what is the power factor? (2023)
A.
0.866
B.
0.5
C.
1
D.
0.707
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Solution
The power factor (PF) is given by cos(θ). If θ = 30 degrees, PF = cos(30°) = √3/2 ≈ 0.866.
Correct Answer: A — 0.866
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Q. In an AC circuit, if the voltage is given by V(t) = V0 sin(ωt), what is the expression for the current if the circuit is purely inductive? (2023)
A.
I(t) = I0 sin(ωt)
B.
I(t) = I0 sin(ωt - π/2)
C.
I(t) = I0 cos(ωt)
D.
I(t) = I0 cos(ωt + π/2)
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Solution
In a purely inductive circuit, the current lags the voltage by 90 degrees (π/2 radians). Therefore, I(t) = I0 sin(ωt - π/2).
Correct Answer: B — I(t) = I0 sin(ωt - π/2)
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Q. In an AC circuit, the current lags behind the voltage by 90 degrees in which type of circuit? (2020)
A.
Resistive
B.
Inductive
C.
Capacitive
D.
RLC
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Solution
In an inductive circuit, the current lags behind the voltage by 90 degrees.
Correct Answer: B — Inductive
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Q. In an AC circuit, the current lags the voltage by 90 degrees in which of the following components? (2020)
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Transformer
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Solution
In an inductor, the current lags the voltage by 90 degrees.
Correct Answer: C — Inductor
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Q. In an AC circuit, what is the phase difference between voltage and current in a purely inductive circuit? (2021)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
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Solution
In a purely inductive AC circuit, the current lags the voltage by 90 degrees.
Correct Answer: B — 90 degrees
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Q. In an electrochemical cell, the anode is where: (2019)
A.
Oxidation occurs
B.
Reduction occurs
C.
Electrons are gained
D.
Ions are produced
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Solution
In an electrochemical cell, oxidation occurs at the anode.
Correct Answer: A — Oxidation occurs
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Q. In ecological succession, what is the term for the first species to colonize a barren environment? (2022)
A.
Pioneer species
B.
Climax community
C.
Keystone species
D.
Invasive species
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Solution
Pioneer species are the first organisms to colonize previously uninhabited or disturbed environments.
Correct Answer: A — Pioneer species
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Q. In flowering plants, the ovary develops into which part after fertilization? (2023)
A.
Seed
B.
Fruit
C.
Flower
D.
Leaf
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Solution
After fertilization, the ovary develops into a fruit, which contains the seeds.
Correct Answer: B — Fruit
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Q. In flowering plants, the process of pollination involves the transfer of pollen from the anther to the: (2021)
A.
Ovary
B.
Style
C.
Stigma
D.
Sepal
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Solution
Pollination is the transfer of pollen from the anther to the stigma of a flower, which is essential for fertilization.
Correct Answer: C — Stigma
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Q. In humans, the allele for brown eyes (B) is dominant over the allele for blue eyes (b). What is the genotype of a person with blue eyes? (2019)
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Solution
A person with blue eyes must have the genotype bb, as blue is recessive.
Correct Answer: C — bb
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Q. In measurements, what does the term 'precision' refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
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Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer: B — Consistency of repeated measurements
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Q. In Mendel's experiments, which trait was observed to be dominant in pea plants? (2018)
A.
Green seed color
B.
Yellow seed color
C.
Wrinkled seeds
D.
Short plants
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Solution
In Mendel's experiments, yellow seed color was observed to be the dominant trait in pea plants.
Correct Answer: B — Yellow seed color
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Q. In Mendel's experiments, which trait was observed to be dominant over the other? (2018)
A.
Green seed color
B.
Yellow seed color
C.
Round seed shape
D.
Wrinkled seed shape
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Solution
In Mendel's experiments, yellow seed color was observed to be dominant over green seed color.
Correct Answer: B — Yellow seed color
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Q. In nuclear fission, what is released as a result of the reaction? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
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Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer: A — Energy and neutrons
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Q. In plants, which structure is primarily responsible for asexual reproduction? (2023)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
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Solution
Stems, particularly in the form of runners or tubers, are primarily responsible for asexual reproduction in many plants.
Correct Answer: C — Stems
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Q. In plants, which structure is responsible for sexual reproduction? (2021)
A.
Roots
B.
Leaves
C.
Flowers
D.
Stems
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Solution
Flowers are the reproductive structures in plants that facilitate sexual reproduction.
Correct Answer: C — Flowers
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Q. In the context of atomic structure, what does the term 'isotope' refer to? (2021)
A.
Atoms with the same number of protons but different neutrons
B.
Atoms with different numbers of protons
C.
Atoms with the same mass number
D.
Atoms that are chemically identical
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Solution
Isotopes are defined as atoms that have the same number of protons but different numbers of neutrons.
Correct Answer: A — Atoms with the same number of protons but different neutrons
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Q. In the context of atomic structure, what does the term 'quantum leap' refer to? (2022)
A.
Movement of electrons in a circular path
B.
Transition of an electron between energy levels
C.
Emission of light
D.
Absorption of energy
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Solution
A 'quantum leap' refers to the transition of an electron between discrete energy levels in an atom.
Correct Answer: B — Transition of an electron between energy levels
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Q. In the kinetic theory of gases, the temperature of a gas is a measure of: (2022)
A.
The average potential energy of the molecules
B.
The average kinetic energy of the molecules
C.
The total energy of the gas
D.
The number of molecules in the gas
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Solution
In the kinetic theory of gases, the temperature of a gas is a measure of the average kinetic energy of the molecules.
Correct Answer: B — The average kinetic energy of the molecules
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Q. In the kinetic theory of gases, the term 'elastic collision' means: (2019)
A.
Kinetic energy is conserved
B.
Momentum is conserved
C.
Both kinetic energy and momentum are conserved
D.
Neither kinetic energy nor momentum is conserved
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Solution
In elastic collisions, both kinetic energy and momentum are conserved, which is a key assumption in the kinetic theory of gases.
Correct Answer: C — Both kinetic energy and momentum are conserved
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Q. In the Langmuir adsorption isotherm, which assumption is NOT made? (2019)
A.
Adsorption occurs on a surface with a finite number of identical sites
B.
Adsorption is reversible
C.
There is no interaction between adsorbed molecules
D.
Adsorption occurs only at high pressures
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Solution
The Langmuir isotherm assumes that adsorption occurs at all pressures, not just high pressures.
Correct Answer: D — Adsorption occurs only at high pressures
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