Q. What is the effect of increasing the temperature of a gas on the speed of sound in that gas?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on pressure
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Solution
The speed of sound in a gas increases with an increase in temperature.
Correct Answer: A — Increases
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Q. What is the effect of increasing the temperature on the average speed of gas molecules?
A.
Average speed decreases
B.
Average speed remains constant
C.
Average speed increases
D.
Average speed becomes zero
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Solution
Increasing the temperature increases the average kinetic energy of gas molecules, which in turn increases their average speed.
Correct Answer: C — Average speed increases
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Q. What is the effect of increasing the temperature on the density of most liquids?
A.
Increases density
B.
Decreases density
C.
No effect
D.
Depends on the liquid
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Solution
For most liquids, increasing the temperature decreases the density as the liquid expands.
Correct Answer: B — Decreases density
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Q. What is the effect of increasing the temperature on the distribution of molecular speeds in a gas?
A.
The distribution becomes narrower
B.
The distribution becomes wider
C.
The distribution remains unchanged
D.
The average speed decreases
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Solution
Increasing the temperature increases the average kinetic energy of the molecules, resulting in a wider distribution of molecular speeds.
Correct Answer: B — The distribution becomes wider
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Q. What is the effect of increasing the temperature on the refractive index of a medium?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Depends on the medium
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Solution
Generally, as temperature increases, the refractive index of a medium decreases due to reduced density.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the temperature on the resistance of a conductor?
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates
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Solution
Increasing the temperature of a conductor generally increases its resistance due to increased atomic vibrations.
Correct Answer: B — Resistance increases
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Q. What is the effect of increasing the temperature on the resistance of the potentiometer wire?
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates
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Solution
Increasing the temperature generally increases the resistance of the potentiometer wire due to the increased vibrations of the atoms in the conductor.
Correct Answer: B — Resistance increases
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Q. What is the effect of increasing the temperature on the RMS speed of a gas?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Depends on pressure
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Solution
Increasing the temperature increases the RMS speed, as v_rms is proportional to the square root of temperature.
Correct Answer: A — Increases
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Q. What is the effect of increasing the temperature on the speed of gas molecules?
A.
Speed decreases
B.
Speed remains constant
C.
Speed increases
D.
Speed becomes zero
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Solution
Increasing the temperature of a gas increases the average kinetic energy of the molecules, which in turn increases their speed.
Correct Answer: C — Speed increases
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Q. What is the effect of increasing the tension in a string on the speed of a wave traveling along it?
A.
Speed decreases
B.
Speed increases
C.
Speed remains constant
D.
Speed becomes zero
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Solution
Increasing the tension in a string increases the speed of the wave, as speed is proportional to the square root of tension.
Correct Answer: B — Speed increases
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Q. What is the effect of increasing the tension in a string on the speed of a wave traveling through it?
A.
Increases speed
B.
Decreases speed
C.
No effect
D.
Depends on the mass
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Solution
Increasing the tension in a string increases the speed of the wave traveling through it, as speed is proportional to the square root of tension.
Correct Answer: A — Increases speed
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Q. What is the effect of increasing the transmission power in a communication system?
A.
Increased range
B.
Decreased noise
C.
Higher bandwidth
D.
Lower distortion
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Solution
Increasing the transmission power generally increases the range of the communication system.
Correct Answer: A — Increased range
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Q. What is the effect of increasing the wavelength of incident light on the photoelectric current?
A.
It increases the current
B.
It decreases the current
C.
It has no effect
D.
It stops the current
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Solution
Increasing the wavelength decreases the frequency, which may fall below the threshold frequency, thus decreasing or stopping the current.
Correct Answer: B — It decreases the current
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Q. What is the effect of increasing the wavelength of incident light on the photoelectric effect?
A.
More electrons are emitted
B.
Fewer electrons are emitted
C.
The kinetic energy of emitted electrons increases
D.
The work function decreases
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Solution
Increasing the wavelength decreases the frequency of the incident light, which can lead to fewer or no electrons being emitted if the frequency falls below the threshold frequency.
Correct Answer: B — Fewer electrons are emitted
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Q. What is the effect of increasing the wavelength of light in a diffraction grating experiment?
A.
Fringe spacing decreases
B.
Fringe spacing increases
C.
No effect on fringe spacing
D.
Fringe intensity increases
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Solution
Increasing the wavelength of light increases the fringe spacing in a diffraction grating experiment.
Correct Answer: B — Fringe spacing increases
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Q. What is the effect of increasing the wavelength of light in a diffraction pattern?
A.
Fringe spacing decreases
B.
Fringe spacing increases
C.
No effect on fringe spacing
D.
Fringe intensity increases
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Solution
Increasing the wavelength of light increases the fringe spacing in a diffraction pattern.
Correct Answer: B — Fringe spacing increases
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Q. What is the effect of increasing the wavelength of light in a double-slit diffraction experiment?
A.
Fringe separation decreases
B.
Fringe separation increases
C.
No effect on fringe separation
D.
Fringe visibility decreases
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Solution
Increasing the wavelength increases the fringe separation, as it is directly proportional to the wavelength.
Correct Answer: B — Fringe separation increases
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Q. What is the effect of increasing the wavelength of light in a double-slit experiment?
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe separation remains unchanged
D.
No effect on interference pattern
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Solution
Increasing the wavelength (λ) increases the fringe width (β), as β is directly proportional to λ.
Correct Answer: B — Fringe width increases
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Q. What is the effect of increasing the wavelength of light in a double-slit experiment on the fringe separation?
A.
Fringe separation decreases
B.
Fringe separation increases
C.
Fringe separation remains the same
D.
Fringe separation becomes zero
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Solution
Fringe separation is directly proportional to the wavelength; increasing the wavelength increases the fringe separation.
Correct Answer: B — Fringe separation increases
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Q. What is the effect of increasing the wavelength of light on the diffraction pattern produced by a single slit?
A.
The pattern becomes sharper
B.
The pattern becomes broader
C.
The pattern remains unchanged
D.
The pattern disappears
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Solution
Increasing the wavelength results in a broader diffraction pattern due to increased spreading of the waves.
Correct Answer: B — The pattern becomes broader
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Q. What is the effect of increasing the wavelength of light on the fringe separation in a double-slit experiment?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on slit separation
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Solution
Fringe separation β = λD/d. Increasing λ increases β, hence fringe separation increases.
Correct Answer: A — Increases
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Q. What is the effect of increasing the wavelength of light used in a double-slit experiment on the fringe separation?
A.
Fringe separation decreases
B.
Fringe separation increases
C.
Fringe separation remains the same
D.
Fringe separation becomes zero
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Solution
Increasing the wavelength (λ) increases the fringe separation (β), as β is directly proportional to λ.
Correct Answer: B — Fringe separation increases
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Q. What is the effect of increasing the wavelength on the diffraction pattern of a single slit?
A.
Fringes become narrower
B.
Fringes become wider
C.
Fringes disappear
D.
Fringes become brighter
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Solution
Increasing the wavelength results in wider fringes in the diffraction pattern, as the angular width of the central maximum increases.
Correct Answer: B — Fringes become wider
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Q. What is the effect of increasing the wavelength on the diffraction pattern?
A.
Fringes become narrower
B.
Fringes become wider
C.
No effect
D.
Fringes disappear
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Solution
Increasing the wavelength results in wider fringes in the diffraction pattern, as fringe width is directly proportional to the wavelength.
Correct Answer: B — Fringes become wider
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Q. What is the effect of increasing the work function of a metal on the photoelectric effect?
A.
More electrons are emitted
B.
Fewer electrons are emitted
C.
The frequency of light must be increased
D.
Both B and C are correct
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Solution
Increasing the work function means that a higher frequency of light is required to emit electrons, resulting in fewer electrons being emitted for a given frequency of light.
Correct Answer: D — Both B and C are correct
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Q. What is the effect of inserting a dielectric material between the plates of a capacitor?
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect on capacitance
D.
Changes the voltage across the plates
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Solution
Inserting a dielectric material increases the capacitance of the capacitor by a factor equal to the dielectric constant of the material.
Correct Answer: A — Increases capacitance
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Q. What is the effect of pressure on the viscosity of gases?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on temperature
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Solution
The viscosity of gases increases with an increase in pressure.
Correct Answer: A — Increases viscosity
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Q. What is the effect of pressure on the viscosity of liquids?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the temperature
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Solution
For most liquids, increasing pressure tends to increase viscosity, although the effect is generally small.
Correct Answer: A — Increases viscosity
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Q. What is the effect of rotating a polarizer in front of a beam of polarized light?
A.
The intensity increases
B.
The intensity decreases
C.
The intensity remains constant
D.
The light changes color
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Solution
As the polarizer is rotated, the intensity of the transmitted light varies according to Malus's law, decreasing as the angle increases.
Correct Answer: B — The intensity decreases
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Q. What is the effect of rotating a polarizer in front of a polarized light source?
A.
Intensity remains constant
B.
Intensity increases
C.
Intensity decreases
D.
Intensity first increases then decreases
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Solution
As the polarizer is rotated, the intensity of the transmitted light varies according to the cosine square of the angle between the light's polarization direction and the polarizer's axis.
Correct Answer: D — Intensity first increases then decreases
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