Q. What is the effect of increasing the current in a wire on the magnetic field around it?
A.
Increases the magnetic field
B.
Decreases the magnetic field
C.
No effect on the magnetic field
D.
Reverses the direction of the magnetic field
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Solution
Increasing the current in a wire increases the magnetic field around it, as per the Biot-Savart Law.
Correct Answer: A — Increases the magnetic field
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Q. What is the effect of increasing the curvature of a lens on its focal length?
A.
Focal length increases
B.
Focal length decreases
C.
Focal length remains the same
D.
Focal length becomes zero
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Solution
Increasing the curvature of a lens decreases its focal length.
Correct Answer: B — Focal length decreases
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Q. What is the effect of increasing the damping coefficient on the amplitude of oscillation in a damped oscillator?
A.
Increases amplitude
B.
Decreases amplitude
C.
No effect
D.
Doubles amplitude
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Solution
Increasing the damping coefficient decreases the amplitude of oscillation in a damped oscillator.
Correct Answer: B — Decreases amplitude
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Q. What is the effect of increasing the diameter of the potentiometer wire on its resistance?
A.
Resistance increases
B.
Resistance decreases
C.
Resistance remains the same
D.
Resistance becomes zero
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Solution
Increasing the diameter of the potentiometer wire decreases its resistance, as resistance is inversely proportional to the cross-sectional area of the wire.
Correct Answer: B — Resistance decreases
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Q. What is the effect of increasing the distance between the plates of a capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Doubles capacitance
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Solution
Increasing the distance between the plates of a capacitor decreases its capacitance, as capacitance is inversely proportional to the distance.
Correct Answer: B — Decreases capacitance
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Q. What is the effect of increasing the distance between the slits in a double-slit experiment on the interference pattern?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe intensity increases
D.
Fringe intensity decreases
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Solution
Increasing the distance between the slits decreases the fringe width, making the fringes closer together.
Correct Answer: B — Fringe width decreases
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Q. What is the effect of increasing the distance between the slits in a double-slit experiment on the fringe separation?
A.
Increases fringe separation
B.
Decreases fringe separation
C.
No effect
D.
Fringe separation becomes zero
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Solution
Increasing the distance between the slits decreases the fringe separation as fringe width is inversely proportional to the slit separation.
Correct Answer: B — Decreases fringe separation
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Q. What is the effect of increasing the distance from a current-carrying wire on the magnetic field strength?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
According to the Biot-Savart Law, the magnetic field strength decreases with increasing distance from the current-carrying wire.
Correct Answer: B — It decreases
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Q. What is the effect of increasing the distance from a long straight conductor on the magnetic field strength?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
According to Biot-Savart Law, the magnetic field strength decreases with increasing distance from the conductor.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the distance from a long straight current-carrying wire on the magnetic field strength?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
According to the Biot-Savart Law, the magnetic field strength decreases with increasing distance from the wire.
Correct Answer: B — It decreases
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Q. What is the effect of increasing the distance from a long straight wire on the magnetic field strength?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes zero
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Solution
The magnetic field strength decreases with increasing distance from a long straight wire, following the inverse relationship with distance.
Correct Answer: B — It decreases
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Q. What is the effect of increasing the distance from the pivot point on the torque produced by a force?
A.
Torque increases
B.
Torque decreases
C.
Torque remains the same
D.
Torque becomes zero
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Solution
Increasing the distance from the pivot point increases the torque produced by the force.
Correct Answer: A — Torque increases
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Q. What is the effect of increasing the frequency of AC on the inductive reactance? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Inductive reactance increases with the frequency of AC.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency of an AC source on the inductive reactance of a circuit?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
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Solution
Inductive reactance (XL) is given by XL = 2πfL, so increasing the frequency (f) increases the inductive reactance.
Correct Answer: C — It increases
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Q. What is the effect of increasing the frequency of an AC source on the inductive reactance? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Increasing the frequency of an AC source increases the inductive reactance.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency of incident light on the photoelectric current?
A.
Increases indefinitely
B.
Decreases
C.
Remains constant
D.
Increases until a threshold frequency is reached
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Solution
The photoelectric current increases with frequency until the threshold frequency is reached, after which it depends on intensity.
Correct Answer: D — Increases until a threshold frequency is reached
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Q. What is the effect of increasing the frequency of the AC supply on the inductive reactance? (2020)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Inductive reactance increases with frequency, as X_L = 2πfL.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency of the alternating current in an inductor?
A.
Inductive reactance decreases
B.
Inductive reactance increases
C.
Inductive reactance remains constant
D.
Inductive reactance becomes zero
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Solution
Inductive reactance (XL) is given by the formula XL = 2πfL, where f is the frequency. Thus, increasing frequency increases inductive reactance.
Correct Answer: B — Inductive reactance increases
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Q. What is the effect of increasing the frequency on the capacitive reactance in an AC circuit? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Capacitive reactance Xc = 1/(2πfC), so increasing frequency decreases Xc.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the capacitive reactance?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Capacitive reactance X_C = 1/(ωC) decreases with increasing frequency.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the impedance of a capacitor in an AC circuit? (2020)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
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Solution
The capacitive reactance decreases with increasing frequency, thus decreasing the impedance.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the impedance of a capacitor? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
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Solution
The impedance of a capacitor decreases with increasing frequency.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the impedance of a series RLC circuit?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on R, L, and C
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Solution
The impedance (Z) of a series RLC circuit depends on the values of resistance (R), inductance (L), capacitance (C), and frequency (f). As frequency increases, the inductive reactance increases and capacitive reactance decreases, affecting the total impedance.
Correct Answer: D — Depends on R, L, and C
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Q. What is the effect of increasing the frequency on the impedance of an inductor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The impedance of an inductor (Z_L) increases with frequency, as Z_L = jωL, where ω = 2πf.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency on the inductive reactance in an AC circuit? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
Show solution
Solution
Inductive reactance Xl = ωL increases with frequency since Xl = 2πfL.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency on the total impedance of an RLC circuit? (2020)
A.
It always increases
B.
It always decreases
C.
It can increase or decrease
D.
It remains constant
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Solution
The total impedance can increase or decrease depending on the relationship between R, XL, and XC as frequency changes.
Correct Answer: C — It can increase or decrease
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Q. What is the effect of increasing the height of a satellite on its orbital speed?
A.
Increases speed
B.
Decreases speed
C.
No effect
D.
Doubles speed
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Solution
Increasing the height of a satellite decreases its orbital speed, as the gravitational force acting on it decreases.
Correct Answer: B — Decreases speed
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Q. What is the effect of increasing the intensity of light on the energy of emitted photoelectrons?
A.
Increases energy
B.
Decreases energy
C.
No effect on energy
D.
Energy becomes negative
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Solution
Increasing the intensity of light increases the number of emitted photoelectrons but does not affect their energy.
Correct Answer: C — No effect on energy
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Q. What is the effect of increasing the intensity of light on the energy of emitted electrons in the photoelectric effect?
A.
It increases the energy
B.
It decreases the energy
C.
It does not affect the energy
D.
It can either increase or decrease the energy
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Solution
Increasing the intensity of light increases the number of emitted electrons but does not affect their energy, which depends on the frequency.
Correct Answer: C — It does not affect the energy
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Q. What is the effect of increasing the intensity of light on the maximum kinetic energy of emitted electrons?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
The maximum kinetic energy of emitted electrons remains the same as it depends only on the frequency of the incident light, not its intensity.
Correct Answer: C — It remains the same
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