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 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?
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 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 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 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 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 maximum kinetic energy of the 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 the emitted electrons is dependent only on the frequency of the incident light, not on its intensity.
Correct Answer: C — It remains the same
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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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Q. What is the effect of increasing the length of a conductor on its resistance?
A.
Increases resistance
B.
Decreases resistance
C.
No effect
D.
Depends on the material
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Solution
Resistance (R) is directly proportional to length (L); increasing length increases resistance.
Correct Answer: A — Increases resistance
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Q. What is the effect of increasing the length of a conductor on its resistivity?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the material
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Solution
Resistivity is an intrinsic property of the material and does not change with length.
Correct Answer: C — No effect
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Q. What is the effect of increasing the mass of a satellite on its orbital radius if the orbital speed is to remain constant?
A.
The orbital radius must increase
B.
The orbital radius must decrease
C.
The orbital radius remains the same
D.
It has no effect on the orbital radius
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Solution
If the orbital speed is to remain constant, increasing the mass of the satellite requires an increase in the orbital radius due to the balance of gravitational and centripetal forces.
Correct Answer: A — The orbital radius must increase
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Q. What is the effect of increasing the mass of a satellite on its orbital radius, assuming the speed remains constant?
A.
The orbital radius increases
B.
The orbital radius decreases
C.
The orbital radius remains the same
D.
It depends on the gravitational force
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Solution
The mass of the satellite does not affect the orbital radius if the speed is constant, as the gravitational force and centripetal force balance each other.
Correct Answer: C — The orbital radius remains the same
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Q. What is the effect of increasing the mass of a satellite on its orbital radius?
A.
It increases the orbital radius.
B.
It decreases the orbital radius.
C.
It has no effect on the orbital radius.
D.
It depends on the altitude.
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Solution
The mass of the satellite does not affect its orbital radius; it is determined by the mass of the Earth and the orbital speed.
Correct Answer: C — It has no effect on the orbital radius.
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Q. What is the effect of increasing the mass of a satellite on its orbital speed?
A.
Increases the orbital speed
B.
Decreases the orbital speed
C.
No effect on orbital speed
D.
Depends on the altitude
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Solution
The orbital speed of a satellite depends on the mass of the Earth and the radius of the orbit, but not on the mass of the satellite itself. Therefore, increasing the mass of the satellite has no effect on its orbital speed.
Correct Answer: C — No effect on orbital speed
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Q. What is the effect of increasing the mass of both objects on the gravitational force between them?
A.
It decreases the force
B.
It increases the force
C.
It has no effect
D.
It depends on the distance
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Solution
Increasing the mass of either or both objects increases the gravitational force between them.
Correct Answer: B — It increases the force
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Q. What is the effect of increasing the molecular weight of a polymer on its viscosity?
A.
Viscosity decreases
B.
Viscosity increases
C.
Viscosity remains the same
D.
Viscosity becomes unpredictable
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Solution
Increasing the molecular weight of a polymer generally leads to an increase in viscosity due to longer chain lengths and entanglements.
Correct Answer: B — Viscosity increases
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Q. What is the effect of increasing the normal force on the frictional force between two surfaces?
A.
Increases frictional force
B.
Decreases frictional force
C.
No effect
D.
Depends on the surface material
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Solution
Frictional force is directly proportional to the normal force. Increasing the normal force increases the frictional force.
Correct Answer: A — Increases frictional force
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Q. What is the effect of increasing the number of gas molecules in a container at constant temperature and volume?
A.
Pressure decreases.
B.
Pressure remains constant.
C.
Pressure increases.
D.
Temperature increases.
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Solution
Increasing the number of gas molecules at constant temperature and volume leads to more collisions with the walls of the container, resulting in increased pressure.
Correct Answer: C — Pressure increases.
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Q. What is the effect of increasing the number of gas molecules on the pressure of the gas at constant volume and temperature?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
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Solution
Increasing the number of gas molecules at constant volume and temperature increases the pressure, according to the ideal gas law.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of gas molecules on the RMS speed?
A.
Increases RMS speed
B.
Decreases RMS speed
C.
No effect on RMS speed
D.
Depends on the type of gas
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Solution
The RMS speed is independent of the number of gas molecules; it depends only on temperature and molar mass.
Correct Answer: C — No effect on RMS speed
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Q. What is the effect of increasing the number of moles of a gas on its pressure at constant volume and temperature?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
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Solution
According to the ideal gas law, increasing the number of moles (n) of a gas while keeping volume (V) and temperature (T) constant will increase the pressure (P).
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of moles of gas in a closed container at constant temperature?
A.
Pressure decreases
B.
Pressure increases
C.
Volume decreases
D.
Temperature decreases
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Solution
According to Avogadro's Law, increasing the number of moles of gas increases the pressure if the volume is constant.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of moles of gas in a closed container at constant temperature and volume?
A.
Pressure decreases
B.
Pressure increases
C.
Volume decreases
D.
Temperature increases
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Solution
According to Avogadro's Law, increasing the number of moles of gas increases the pressure if temperature and volume are constant.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of moles of gas on pressure at constant volume and temperature?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
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Solution
According to the ideal gas law, increasing the number of moles of gas at constant volume and temperature will increase the pressure.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of moles of gas on the pressure at constant volume and temperature?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Volume increases
Show solution
Solution
According to Avogadro's Law, increasing the number of moles of gas at constant volume and temperature will increase the pressure.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of moles of gas on the pressure, assuming volume and temperature are constant?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
Show solution
Solution
According to Avogadro's Law, increasing the number of moles of gas increases the pressure if volume and temperature are constant.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the number of slits in a diffraction grating on the sharpness of the maxima?
A.
Maxima become sharper
B.
Maxima become broader
C.
No effect on sharpness
D.
Maxima disappear
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Solution
Increasing the number of slits in a diffraction grating results in sharper maxima due to increased constructive interference.
Correct Answer: A — Maxima become sharper
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Q. What is the effect of increasing the number of turns in a coil on the induced EMF when the magnetic flux changes?
A.
It increases the induced EMF
B.
It decreases the induced EMF
C.
It has no effect
D.
It makes the induced EMF zero
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Solution
According to Faraday's law, the induced EMF is directly proportional to the number of turns in the coil. Therefore, increasing the number of turns increases the induced EMF.
Correct Answer: A — It increases the induced EMF
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