Q. What is the effect of increasing the size of the halogen atom on the bond strength of haloalkanes? (2021)
A.
Increases bond strength
B.
Decreases bond strength
C.
No effect
D.
Increases reactivity
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Solution
As the size of the halogen atom increases, the bond length increases, leading to a decrease in bond strength.
Correct Answer:
B
— Decreases bond strength
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the reactivity? (2023)
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Reactivity depends on the solvent
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Solution
Increasing the size of the halogen decreases the bond strength, thus increasing the reactivity of haloalkanes in nucleophilic substitution.
Correct Answer:
A
— Increases reactivity
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Q. What is the effect of increasing the slit width in a single-slit diffraction experiment? (2021)
A.
Fringe width increases
B.
Fringe width decreases
C.
No effect on fringe width
D.
Fringe pattern disappears
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Solution
Increasing the slit width decreases the fringe width because the angle of diffraction decreases.
Correct Answer:
B
— Fringe width decreases
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Q. What is the effect of increasing the temperature of a conductor on its resistance? (2019)
A.
Resistance decreases
B.
Resistance increases
C.
Resistance remains constant
D.
Resistance fluctuates
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Solution
Generally, the resistance of a conductor increases with an increase in temperature.
Correct Answer:
B
— Resistance increases
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Q. What is the effect of increasing the temperature on the equilibrium constant Kc for an endothermic reaction? (2023)
A.
Kc decreases
B.
Kc increases
C.
Kc remains constant
D.
Kc becomes zero
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Solution
For an endothermic reaction, increasing the temperature shifts the equilibrium to the right, thus increasing the value of Kc.
Correct Answer:
B
— Kc increases
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Q. What is the effect of increasing the temperature on the solubility of most solid solutes in water? (2023)
A.
Increases solubility
B.
Decreases solubility
C.
No effect
D.
Depends on the solute
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Solution
For most solid solutes, increasing the temperature increases their solubility in water.
Correct Answer:
A
— Increases solubility
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Q. What is the effect of increasing the voltage in a circuit with constant resistance? (2019)
A.
Current decreases
B.
Current increases
C.
Current remains the same
D.
Resistance increases
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Solution
Increasing the voltage while keeping resistance constant will increase the current.
Correct Answer:
B
— Current 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? (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 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 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 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
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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
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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
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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 temperature on chemisorption? (2023)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the gas
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Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of temperature on chemisorption? (2023) 2023
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Depends on the gas
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Solution
Chemisorption typically decreases with an increase in temperature because it involves the formation of stronger chemical bonds, which are less favorable at higher thermal energies.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect of temperature on the cell potential according to the Nernst equation?
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Depends on the reaction
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Solution
According to the Nernst equation, the cell potential generally increases with temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the conductivity of intrinsic semiconductors? (2021)
A.
Conductivity decreases
B.
Conductivity remains constant
C.
Conductivity increases
D.
Conductivity becomes zero
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Solution
As temperature increases, more electrons gain enough energy to jump the band gap, increasing conductivity.
Correct Answer:
C
— Conductivity increases
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Q. What is the effect of temperature on the conductivity of semiconductors? (2019)
A.
Conductivity decreases
B.
Conductivity remains constant
C.
Conductivity increases
D.
Conductivity becomes zero
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Solution
As temperature increases, the conductivity of semiconductors increases due to the generation of more charge carriers.
Correct Answer:
C
— Conductivity increases
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Q. What is the effect of temperature on the magnetism of ferromagnetic materials? (2022)
A.
Increases magnetism
B.
Decreases magnetism
C.
No effect
D.
Reverses magnetism
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Solution
Increasing temperature generally decreases the magnetism of ferromagnetic materials, as thermal agitation disrupts the alignment of magnetic domains.
Correct Answer:
B
— Decreases magnetism
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Q. What is the effect of temperature on the solubility of most solid solutes in liquids? (2022)
A.
Increases with temperature
B.
Decreases with temperature
C.
No effect
D.
Varies with the solute
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Solution
For most solid solutes, solubility in liquids increases with temperature due to increased kinetic energy of the molecules.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the solubility of most solid solutes in water? (2023)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies unpredictably
Show solution
Solution
For most solid solutes, solubility increases with an increase in temperature.
Correct Answer:
A
— Increases with temperature
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Q. What is the effect of temperature on the viscosity of a liquid? (2020)
A.
Increases with temperature
B.
Decreases with temperature
C.
Remains constant
D.
Varies randomly
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Solution
The viscosity of a liquid generally decreases with an increase in temperature, making it flow more easily.
Correct Answer:
B
— Decreases with temperature
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Q. What is the effect on the fringe separation in a double-slit experiment if the distance between the slits and the screen is increased? (2021)
A.
Fringe separation decreases
B.
Fringe separation increases
C.
Fringe separation remains the same
D.
Fringe separation becomes zero
Show solution
Solution
Fringe separation is directly proportional to the distance from the slits to the screen. Increasing this distance increases the fringe separation.
Correct Answer:
B
— Fringe separation increases
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