Q. In a parallel RLC circuit, if R = 50 ohms, L = 0.2H, and C = 50μF, what is the total admittance? (2023)
A.
0.02 S
B.
0.04 S
C.
0.06 S
D.
0.08 S
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Solution
Y = 1/R + j(ωC - 1/ωL); calculate Y for given values.
Correct Answer: C — 0.06 S
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Q. In a parallel RLC circuit, if R = 50Ω, L = 0.2 H, and C = 50μF, what is the quality factor Q? (2015)
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Solution
Quality factor Q = (1/R) * √(L/C) = (1/50) * √(0.2/50e-6) = 2.
Correct Answer: B — 2
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Q. In a parallel RLC circuit, if the resistance is 10Ω, inductance is 0.2H, and capacitance is 50μF, what is the total admittance? (2022)
A.
0.1 S
B.
0.2 S
C.
0.3 S
D.
0.4 S
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Solution
Total admittance Y = 1/R + j(ωC - 1/ωL). Calculate Y using given values.
Correct Answer: C — 0.3 S
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Q. In a parallel RLC circuit, if the resistance is 10Ω, inductance is 0.2H, and capacitance is 50μF, what is the total current at resonance? (2022)
A.
0.5A
B.
1A
C.
2A
D.
4A
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Solution
At resonance, total current I = V/R. Calculate using V = 10V.
Correct Answer: B — 1A
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Q. In a pedigree chart, a filled circle represents which of the following? (2023)
A.
Male
B.
Female
C.
Affected female
D.
Affected male
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Solution
In a pedigree chart, a filled circle represents an affected female.
Correct Answer: C — Affected female
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Q. In a PN junction diode, the depletion region is formed due to: (2019)
A.
Excess electrons
B.
Excess holes
C.
Recombination of electrons and holes
D.
External voltage
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Solution
The depletion region in a PN junction diode is formed due to the recombination of electrons and holes at the junction.
Correct Answer: C — Recombination of electrons and holes
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Q. In a PN junction diode, what happens when it is forward biased? (2019)
A.
Depletion region widens
B.
Depletion region narrows
C.
No current flows
D.
Reverse current increases
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Solution
When a PN junction diode is forward biased, the depletion region narrows, allowing current to flow.
Correct Answer: B — Depletion region narrows
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Q. In a PN junction, what is formed at the junction of p-type and n-type materials? (2021)
A.
Electric field
B.
Magnetic field
C.
Thermal field
D.
Gravitational field
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Solution
An electric field is formed at the junction of p-type and n-type materials due to the diffusion of charge carriers.
Correct Answer: A — Electric field
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Q. In a PN junction, what is the region called where no charge carriers are present? (2019)
A.
Depletion region
B.
Conduction band
C.
Valence band
D.
Neutral zone
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Solution
The depletion region is the area around the PN junction where no free charge carriers are present.
Correct Answer: A — Depletion region
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Q. In a predator-prey relationship, what is the primary effect of an increase in the prey population? (2021)
A.
Decrease in predator population
B.
Increase in predator population
C.
Decrease in prey population
D.
No effect on predator population
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Solution
An increase in the prey population typically leads to an increase in the predator population due to more available food.
Correct Answer: B — Increase in predator population
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Q. In a predator-prey relationship, which of the following is true? (2022)
A.
Predators are always larger than their prey.
B.
Prey populations are always larger than predator populations.
C.
Predators help control prey populations.
D.
Prey can never escape predators.
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Solution
Predators help control the population of prey species, maintaining a balance in the ecosystem.
Correct Answer: C — Predators help control prey populations.
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Q. In a purely capacitive AC circuit, the current leads the voltage by how many degrees? (2022)
A.
0°
B.
90°
C.
180°
D.
270°
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Solution
In a purely capacitive circuit, the current leads the voltage by 90°.
Correct Answer: B — 90°
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Q. In a purely capacitive AC circuit, the current leads the voltage by how much phase angle? (2023)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
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Solution
In a purely capacitive circuit, the current leads the voltage by 90 degrees.
Correct Answer: B — 90 degrees
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Q. In a ray diagram for a concave lens, the rays parallel to the principal axis appear to diverge from which point? (2021)
A.
Focal point
B.
Center of curvature
C.
Optical center
D.
Principal focus
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Solution
In a ray diagram for a concave lens, rays parallel to the principal axis appear to diverge from the focal point.
Correct Answer: A — Focal point
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Q. In a reaction A → B, if the concentration of A decreases from 0.8 M to 0.4 M in 20 minutes, what is the average rate of reaction? (2019)
A.
0.02 M/min
B.
0.04 M/min
C.
0.1 M/min
D.
0.05 M/min
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Solution
Average rate = Δ[A]/Δt = (0.8 - 0.4) / 20 = 0.02 M/min.
Correct Answer: D — 0.05 M/min
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Q. In a reaction at equilibrium, if the concentration of a reactant is increased, what will happen to the equilibrium position? (2019)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
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Solution
Increasing the concentration of a reactant will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: A — Shift to the right
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Q. In a reaction at equilibrium, if the concentration of products is increased, what will happen? (2022)
A.
Equilibrium shifts to the left
B.
Equilibrium shifts to the right
C.
No change
D.
Reaction stops
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Solution
According to Le Chatelier's principle, increasing the concentration of products will shift the equilibrium to the left, favoring the formation of reactants.
Correct Answer: A — Equilibrium shifts to the left
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Q. In a reaction at equilibrium, if the concentration of reactants is increased, what will happen to the position of equilibrium? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
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Solution
According to Le Chatelier's principle, increasing the concentration of reactants will shift the equilibrium position to the right to produce more products.
Correct Answer: A — Shift to the right
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Q. In a reaction at equilibrium, if the temperature is increased and the reaction is exothermic, what will happen? (2021)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kc
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
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Q. In a reaction at equilibrium, if the temperature is increased for an exothermic reaction, what will happen? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in pressure
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, favoring the reactants.
Correct Answer: B — Shift to the left
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Q. In a reaction, if the concentration of reactant A is halved, and the rate constant remains the same, how does the rate change for a first-order reaction? (2021)
A.
Doubles
B.
Halves
C.
Remains the same
D.
Quadruples
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Solution
For a first-order reaction, if [A] is halved, the rate also halves.
Correct Answer: B — Halves
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Q. In a reaction, if the concentration of reactant A is halved, and the rate of reaction decreases to one-fourth, what is the order of the reaction? (2020)
A.
Zero
B.
First
C.
Second
D.
Third
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Solution
If the rate decreases to one-fourth when concentration is halved, the reaction is second-order.
Correct Answer: C — Second
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Q. In a reaction, if the concentration of reactants is doubled, what happens to the rate of reaction if it is first order? (2023)
A.
Doubles
B.
Triples
C.
Quadruples
D.
Remains the same
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Solution
For a first-order reaction, the rate is directly proportional to the concentration of the reactant, so doubling the concentration doubles the rate.
Correct Answer: A — Doubles
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Q. In a redox reaction, if the oxidation state of an element decreases, what happens to that element? (2021)
A.
It is oxidized
B.
It is reduced
C.
It remains unchanged
D.
It is ionized
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Solution
A decrease in oxidation state indicates that the element has gained electrons, which means it is reduced.
Correct Answer: B — It is reduced
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Q. In a redox reaction, if the oxidation state of an element decreases, what has occurred? (2021)
A.
Oxidation
B.
Reduction
C.
Neutralization
D.
Decomposition
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Solution
A decrease in oxidation state indicates that the element has gained electrons, which is defined as reduction.
Correct Answer: B — Reduction
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Q. In a redox reaction, if the oxidation state of an element decreases, what is happening to that element? (2021)
A.
It is being oxidized
B.
It is being reduced
C.
It is unchanged
D.
It is ionized
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Solution
A decrease in oxidation state indicates that the element is gaining electrons, which means it is being reduced.
Correct Answer: B — It is being reduced
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Q. In a redox reaction, if the oxidation state of an element increases, what happens to that element? (2021)
A.
It is oxidized
B.
It is reduced
C.
It remains unchanged
D.
It forms a compound
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Solution
An increase in the oxidation state of an element indicates that it has lost electrons, which means it is oxidized.
Correct Answer: A — It is oxidized
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Q. In a redox reaction, the substance that gains electrons is called: (2021)
A.
Oxidizing agent
B.
Reducing agent
C.
Reducing agent
D.
None of the above
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Solution
The substance that gains electrons in a redox reaction is called the oxidizing agent.
Correct Answer: A — Oxidizing agent
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Q. In a redox reaction, what happens to the oxidation state of the reducing agent? (2021)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies
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Solution
The oxidation state of the reducing agent decreases as it loses electrons during the reaction.
Correct Answer: B — Decreases
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Q. In a redox reaction, which of the following statements is true? (2020)
A.
Oxidation involves gain of electrons
B.
Reduction involves loss of electrons
C.
Oxidation state of an element decreases during oxidation
D.
Reduction involves gain of electrons
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Solution
Reduction is defined as the gain of electrons, which decreases the oxidation state of the element.
Correct Answer: D — Reduction involves gain of electrons
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