Q. What happens to the induced emf when the rate of change of magnetic flux increases? (2019)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The induced emf increases when the rate of change of magnetic flux increases, according to Faraday's Law.
Correct Answer: A — Increases
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Q. What happens to the internal energy of an ideal gas during an isothermal expansion? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on the amount of gas
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Solution
During an isothermal expansion of an ideal gas, the internal energy remains constant because the temperature does not change.
Correct Answer: C — Remains constant
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Q. What happens to the magnetic field inside a solenoid when the current is increased? (2020)
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
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Solution
The magnetic field inside a solenoid is directly proportional to the current. Therefore, if the current is increased, the magnetic field also increases.
Correct Answer: C — It increases
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Q. What happens to the magnetic field strength inside a long solenoid if the current is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, doubling the current will double the magnetic field strength.
Correct Answer: B — It doubles
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Q. What happens to the magnetic field strength inside a solenoid if the current is increased? (2021)
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
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Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it.
Correct Answer: C — It increases
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Q. What happens to the magnetic field strength inside a solenoid if the current through it is doubled? (2021)
A.
It remains the same
B.
It doubles
C.
It quadruples
D.
It halves
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Solution
The magnetic field strength inside a solenoid is directly proportional to the current flowing through it. Therefore, if the current is doubled, the magnetic field strength also doubles.
Correct Answer: B — It doubles
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Q. What happens to the magnetic field when the direction of current in a wire is reversed? (2023)
A.
The magnetic field remains unchanged
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
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Solution
Reversing the direction of current in a wire reverses the direction of the magnetic field around it.
Correct Answer: B — The magnetic field direction reverses
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Q. What happens to the resistance of a semiconductor as it is illuminated? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes infinite
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Solution
The resistance of a semiconductor decreases when it is illuminated due to the generation of electron-hole pairs.
Correct Answer: B — Decreases
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Q. What happens to the resistance of a semiconductor as temperature increases? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
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Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
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Q. What happens to the resistance of a semiconductor with an increase in temperature? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
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Solution
The resistance of a semiconductor decreases with an increase in temperature due to the increased number of charge carriers.
Correct Answer: B — Decreases
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Q. What happens to the shear modulus if the shear stress is doubled while keeping the shear strain constant? (2019)
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Shear modulus (G) is defined as shear stress divided by shear strain. If shear strain is constant, doubling shear stress does not change G.
Correct Answer: C — It remains the same
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Q. What happens to the speed of light as it passes from air into water? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The speed of light decreases when it passes from a less dense medium (air) to a denser medium (water).
Correct Answer: B — Decreases
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Q. What happens to the total current in a parallel circuit if one branch is disconnected? (2023)
A.
Total current increases
B.
Total current decreases
C.
Total current remains the same
D.
Total current becomes zero
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Solution
In a parallel circuit, if one branch is disconnected, the total current decreases.
Correct Answer: B — Total current decreases
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Q. What happens to the total current in a parallel circuit when more branches are added? (2019)
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
In a parallel circuit, adding more branches increases the total current.
Correct Answer: B — It increases
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Q. What happens to the total current in a parallel RLC circuit at resonance? (2022)
A.
It is maximum
B.
It is minimum
C.
It is zero
D.
It is constant
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Solution
At resonance in a parallel RLC circuit, the total current is maximum because the impedance is at its minimum.
Correct Answer: A — It is maximum
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Q. What happens to the total resistance in a parallel circuit when more resistors are added? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes infinite
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Solution
In a parallel circuit, adding more resistors decreases the total resistance because the total resistance is given by 1/R_total = 1/R1 + 1/R2 + ...
Correct Answer: B — It decreases
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Q. What happens to the volume of a material when it is subjected to uniform pressure? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It depends on the material
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Solution
Uniform pressure typically causes a decrease in volume, known as compression.
Correct Answer: B — It decreases
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Q. What happens to the volume of a solid when it is subjected to uniform pressure? (2019)
A.
It increases
B.
It decreases
C.
It remains the same
D.
It depends on the material
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Solution
The volume of a solid generally decreases when subjected to uniform pressure, as per the bulk modulus.
Correct Answer: B — It decreases
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Q. What hormone is primarily responsible for regulating blood glucose levels? (2020)
A.
Insulin
B.
Glucagon
C.
Cortisol
D.
Adrenaline
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Solution
Insulin is the hormone produced by the pancreas that lowers blood glucose levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What hormone is primarily responsible for regulating blood sugar levels? (2020)
A.
Insulin
B.
Glucagon
C.
Adrenaline
D.
Cortisol
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Solution
Insulin is the hormone produced by the pancreas that lowers blood sugar levels by facilitating the uptake of glucose into cells.
Correct Answer: A — Insulin
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Q. What is a trophic level? (2020)
A.
A level of energy in an ecosystem
B.
A level of biodiversity
C.
A level of pollution
D.
A level of soil fertility
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Solution
A trophic level refers to the position an organism occupies in a food chain, indicating its energy level.
Correct Answer: A — A level of energy in an ecosystem
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Q. What is adaptive radiation? (1960)
A.
Rapid evolution of many species from a common ancestor
B.
Evolution of similar traits in unrelated species
C.
The extinction of a species
D.
The migration of species to new habitats
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Solution
Adaptive radiation is the rapid evolution of many species from a common ancestor, often occurring when species colonize new environments with diverse ecological niches.
Correct Answer: A — Rapid evolution of many species from a common ancestor
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Q. What is binomial nomenclature? (2021)
A.
A method of classifying organisms
B.
A two-part naming system
C.
A type of genetic mutation
D.
A method of reproduction
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Solution
Binomial nomenclature is a two-part naming system for organisms, consisting of the genus and species names.
Correct Answer: B — A two-part naming system
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Q. What is carrying capacity? (2021)
A.
The maximum number of individuals an environment can support
B.
The minimum number of individuals needed for a population to survive
C.
The average number of individuals in a population
D.
The number of species in a community
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Solution
Carrying capacity is the maximum number of individuals of a species that an environment can sustainably support.
Correct Answer: A — The maximum number of individuals an environment can support
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Q. What is genetic drift? (2015)
A.
Change in allele frequencies due to chance
B.
Natural selection acting on a population
C.
Migration of individuals into a population
D.
Mutation of genes
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Solution
Genetic drift refers to changes in allele frequencies in a population due to random sampling of organisms, which can lead to significant changes over time, especially in small populations.
Correct Answer: A — Change in allele frequencies due to chance
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Q. What is ovulation? (2023)
A.
Release of an egg from the ovary
B.
Fertilization of the egg
C.
Implantation of the embryo
D.
Menstruation
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Solution
Ovulation is the process of releasing an egg from the ovary, which is a key event in the female reproductive cycle.
Correct Answer: A — Release of an egg from the ovary
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Q. What is parthenogenesis? (2020)
A.
Development of an embryo from an unfertilized egg
B.
A form of asexual reproduction
C.
A type of sexual reproduction
D.
Both a and b
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Solution
Parthenogenesis is a form of asexual reproduction where an embryo develops from an unfertilized egg, and it is considered a type of asexual reproduction.
Correct Answer: D — Both a and b
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Q. What is the absolute error if the true value is 50 and the measured value is 48? (2022)
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Solution
Absolute error is calculated as the absolute difference between the true value and the measured value, which is |50 - 48| = 2.
Correct Answer: A — 2
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Q. What is the absolute error in a measurement of 50.0 cm if the true value is 48.0 cm? (2022)
A.
2.0 cm
B.
1.0 cm
C.
3.0 cm
D.
4.0 cm
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Solution
Absolute error = |Measured value - True value| = |50.0 cm - 48.0 cm| = 2.0 cm.
Correct Answer: A — 2.0 cm
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Q. What is the absolute error in a measurement of 50.0 cm if the true value is 52.0 cm? (2022)
A.
2.0 cm
B.
1.0 cm
C.
0.5 cm
D.
3.0 cm
Show solution
Solution
Absolute error = |Measured value - True value| = |50.0 cm - 52.0 cm| = 2.0 cm.
Correct Answer: A — 2.0 cm
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