Q. What is the effect of increasing resistance in a series RLC circuit at resonance? (2023)
A.
Increases current
B.
Decreases current
C.
No effect on current
D.
Increases voltage
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Solution
Increasing resistance in a series RLC circuit at resonance will decrease the current, as the impedance increases.
Correct Answer: B — Decreases current
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Q. What is the effect of increasing temperature on the conductivity of an electrolyte solution? (2019)
A.
Increases conductivity
B.
Decreases conductivity
C.
No effect
D.
Depends on the electrolyte
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Solution
Increasing temperature generally increases the conductivity of an electrolyte solution due to increased ion mobility.
Correct Answer: A — Increases conductivity
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Q. What is the effect of increasing temperature on the kinetic energy of particles in a solid? (2023)
A.
Decreases kinetic energy
B.
Increases kinetic energy
C.
No effect
D.
Causes phase change
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Solution
Increasing temperature increases the kinetic energy of particles, leading to potential phase change.
Correct Answer: B — Increases kinetic energy
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Q. What is the effect of increasing temperature on the viscosity of liquids? (2019)
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the liquid
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Solution
Increasing temperature generally decreases the viscosity of liquids, allowing them to flow more easily.
Correct Answer: B — Decreases viscosity
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Q. What is the effect of increasing the area of the plates of a capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Capacitance becomes zero
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Solution
Increasing the area A of the plates increases the capacitance, as C = εA/d.
Correct Answer: A — Increases capacitance
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Q. What is the effect of increasing the capacitance in a capacitive AC circuit? (2023)
A.
Increases current
B.
Decreases current
C.
No effect on current
D.
Increases voltage
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Solution
In a capacitive AC circuit, increasing the capacitance decreases the capacitive reactance (X_C), which increases the current (I = V/X_C).
Correct Answer: A — Increases current
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Q. What is the effect of increasing the capacitance in an AC circuit? (2019)
A.
Increases inductive reactance
B.
Decreases capacitive reactance
C.
Increases total impedance
D.
Decreases total current
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Solution
Increasing the capacitance decreases the capacitive reactance (X_C = 1/(2πfC)), which can lead to an increase in current.
Correct Answer: B — Decreases capacitive reactance
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Q. What is the effect of increasing the concentration of reactants on the rate of reaction? (2023)
A.
Increases the rate
B.
Decreases the rate
C.
No effect
D.
Depends on the reaction
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Solution
Increasing the concentration of reactants generally increases the rate of reaction due to more frequent collisions.
Correct Answer: A — Increases the rate
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Q. What is the effect of increasing the distance between the plates of a capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Doubles capacitance
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Solution
Increasing the distance between the plates of a capacitor decreases its capacitance, as capacitance is inversely proportional to the distance.
Correct Answer: B — Decreases capacitance
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Q. What is the effect of increasing the frequency of AC on the inductive reactance? (2021)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Inductive reactance increases with the frequency of AC.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency of an AC source on the inductive reactance? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Increasing the frequency of an AC source increases the inductive reactance.
Correct Answer: A — Increases
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Q. What is the effect of increasing the frequency of the AC supply on the inductive reactance? (2020)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
Inductive reactance increases with frequency, as X_L = 2πfL.
Correct Answer: A — Increases
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Q. What is the effect of increasing the number of turns in a coil on its inductance? (2023)
A.
Increases inductance
B.
Decreases inductance
C.
No effect
D.
Depends on the material
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Solution
Increasing the number of turns in a coil increases its inductance.
Correct Answer: A — Increases inductance
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Q. What is the effect of increasing the number of turns in a solenoid on its magnetic field strength? (2022)
A.
Decreases the field strength
B.
Increases the field strength
C.
No effect
D.
Reverses the field direction
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Solution
Increasing the number of turns (n) in a solenoid increases the magnetic field strength, as B = μ₀nI.
Correct Answer: B — Increases the field strength
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Q. What is the effect of increasing the plate area of a parallel plate capacitor on its capacitance? (2022)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Capacitance becomes zero
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Solution
Increasing the plate area A of a parallel plate capacitor increases its capacitance, as C = ε₀A/d.
Correct Answer: A — Increases capacitance
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Q. What is the effect of increasing the resistance in a circuit while keeping the voltage constant? (2019)
A.
Current increases
B.
Current decreases
C.
Current remains the same
D.
Voltage increases
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Solution
According to Ohm's law, if resistance increases while voltage remains constant, current decreases.
Correct Answer: B — Current decreases
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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 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 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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