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 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 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 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 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 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 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 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 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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Q. What is the effect of substituents on the reactivity of aromatic compounds in electrophilic substitution?
A.
All substituents deactivate the ring.
B.
Electron-donating groups activate the ring.
C.
Electron-withdrawing groups have no effect.
D.
All substituents direct to the meta position.
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Solution
Electron-donating groups activate the aromatic ring, making it more reactive towards electrophilic substitution.
Correct Answer: B — Electron-donating groups activate the ring.
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Q. What is the effect of substituents on the reactivity of aromatic compounds?
A.
All substituents are deactivating
B.
Some are activating and some are deactivating
C.
All are activating
D.
None affect reactivity
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Solution
Substituents can either activate or deactivate the aromatic ring towards electrophilic substitution, depending on their electron-donating or electron-withdrawing nature.
Correct Answer: B — Some are activating and some are deactivating
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Q. What is the effect of surfactants on the surface tension of water?
A.
Increase surface tension
B.
Decrease surface tension
C.
No effect
D.
Double the surface tension
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Solution
Surfactants decrease the surface tension of water.
Correct Answer: B — Decrease surface tension
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Q. What is the effect of temperature on Raoult's Law?
A.
It has no effect.
B.
It increases vapor pressure.
C.
It decreases vapor pressure.
D.
It only affects the solute.
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Solution
Temperature affects the vapor pressure of both the solvent and the solution, generally increasing vapor pressure with temperature.
Correct Answer: B — It increases vapor pressure.
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Q. What is the effect of temperature on the capacitance of a capacitor?
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Depends on the dielectric
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Solution
The effect of temperature on capacitance depends on the dielectric material used in the capacitor.
Correct Answer: D — Depends on the dielectric
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Q. What is the effect of temperature on the entropy of a substance?
A.
Entropy decreases with increasing temperature.
B.
Entropy increases with increasing temperature.
C.
Entropy remains constant with temperature.
D.
Temperature has no effect on entropy.
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Solution
As temperature increases, the kinetic energy of particles increases, leading to greater disorder and thus higher entropy.
Correct Answer: B — Entropy increases with increasing temperature.
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Q. What is the effect of temperature on the equilibrium constant for an exothermic reaction?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the concentration
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Solution
For exothermic reactions, increasing the temperature shifts the equilibrium to the left, thus decreasing the equilibrium constant.
Correct Answer: B — Decreases with temperature
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Q. What is the effect of temperature on the equilibrium constant K for an exothermic reaction?
A.
K increases with temperature
B.
K decreases with temperature
C.
K remains constant
D.
K is independent of temperature
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Solution
For an exothermic reaction, increasing the temperature shifts the equilibrium to the left, thus decreasing the value of K.
Correct Answer: B — K decreases with temperature
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Q. What is the effect of temperature on the magnetic susceptibility of a paramagnetic material?
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Becomes zero
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Solution
The magnetic susceptibility of a paramagnetic material decreases with increasing temperature.
Correct Answer: B — Decreases with temperature
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