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 angle of refraction when it passes from air into glass? (2023)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Increasing the wavelength of light decreases the angle of refraction when passing from air into glass due to the dispersion of light.
Correct Answer: B — Decreases
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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 diffraction pattern? (2019)
A.
Increases fringe width
B.
Decreases fringe width
C.
No effect
D.
Increases intensity
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Solution
Increasing the wavelength of light increases the fringe width in a diffraction pattern.
Correct Answer: A — Increases fringe width
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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
Show solution
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 introducing a dielectric material between the plates of a capacitor? (2019)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Increases resistance
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Solution
Introducing a dielectric material increases the capacitance of a capacitor by reducing the electric field between the plates.
Correct Answer: A — Increases capacitance
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Q. What is the effect of magnesium deficiency in plants? (2022)
A.
Stunted growth
B.
Leaf curling
C.
Chlorosis
D.
Wilting
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Solution
Magnesium deficiency leads to chlorosis, particularly in older leaves, as it is a key component of chlorophyll.
Correct Answer: C — Chlorosis
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Q. What is the effect of multiplying a function by a negative constant on its graph?
A.
It reflects the graph across the x-axis.
B.
It reflects the graph across the y-axis.
C.
It shifts the graph to the left.
D.
It stretches the graph vertically.
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Solution
Multiplying a function by a negative constant reflects the graph across the x-axis.
Correct Answer: A — It reflects the graph across the x-axis.
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Q. What is the effect of parathyroid hormone (PTH)? (2019)
A.
Increase calcium levels in blood
B.
Decrease calcium levels in blood
C.
Increase phosphate levels
D.
Decrease phosphate levels
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Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.
Correct Answer: A — Increase calcium levels in blood
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Q. What is the effect of photoperiod on flowering in plants? (2020)
A.
It has no effect
B.
It determines the timing of flowering
C.
It inhibits flowering
D.
It promotes vegetative growth
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Solution
Photoperiod is crucial in determining the timing of flowering in many plants, influencing their reproductive cycle.
Correct Answer: B — It determines the timing of flowering
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Q. What is the effect of placing a ferromagnetic material in a magnetic field? (2023)
A.
It becomes a magnet
B.
It repels the magnetic field
C.
It has no effect
D.
It weakens the magnetic field
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Solution
When a ferromagnetic material is placed in a magnetic field, it becomes magnetized and can retain its magnetism even after the external field is removed.
Correct Answer: A — It becomes a magnet
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Q. What is the effect of placing a ferromagnetic material inside a solenoid? (2023)
A.
Decreases the magnetic field
B.
Increases the magnetic field
C.
No effect
D.
Reverses the magnetic field
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Solution
Placing a ferromagnetic material inside a solenoid increases the magnetic field due to the material's high magnetic permeability.
Correct Answer: B — Increases the magnetic field
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Q. What is the effect of plastic pollution on marine life? (2022)
A.
Increased fish populations
B.
Habitat destruction
C.
Bioaccumulation of toxins
D.
Both b and c
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Solution
Plastic pollution leads to habitat destruction and bioaccumulation of toxins in marine organisms, severely impacting marine ecosystems.
Correct Answer: D — Both b and c
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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 reversing the direction of current in a loop of wire on the magnetic field it produces? (2019)
A.
The magnetic field disappears
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field becomes weaker
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Solution
Reversing the direction of current in a loop of wire reverses the direction of the magnetic field produced by that loop.
Correct Answer: B — The magnetic field direction reverses
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Q. What is the effect of reversing the direction of current in a loop of wire on the magnetic field? (2019)
A.
The magnetic field direction remains the same
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
Show solution
Solution
Reversing the direction of current in a loop of wire reverses the direction of the magnetic field produced by the loop.
Correct Answer: B — The magnetic field direction reverses
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Q. What is the effect of reversing the direction of current in a loop on the magnetic field direction? (2019)
A.
The magnetic field direction remains unchanged
B.
The magnetic field direction reverses
C.
The magnetic field disappears
D.
The magnetic field becomes weaker
Show solution
Solution
Reversing the direction of current in a loop reverses the direction of the magnetic field produced by the loop.
Correct Answer: B — The magnetic field direction reverses
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Q. What is the effect of reversing the direction of current in a wire on the magnetic field around it? (2019)
A.
The magnetic field disappears
B.
The magnetic field direction reverses
C.
The magnetic field strength increases
D.
The magnetic field strength decreases
Show solution
Solution
Reversing the direction of current in a wire reverses the direction of the magnetic field around it.
Correct Answer: B — The magnetic field direction reverses
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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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