Undergraduate
Q. What is the effect of dielectric on the capacitance of a capacitor? (2021)
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Depends on the voltage
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Solution
Introducing a dielectric material between the plates of a capacitor increases its capacitance by a factor equal to the dielectric constant (κ) of the material.
Correct Answer: A — Increases capacitance
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Q. What is the effect of gibberellins on seed germination? (2020)
A.
Inhibits germination
B.
Promotes germination
C.
No effect
D.
Causes premature germination
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Solution
Gibberellins promote seed germination by breaking dormancy and stimulating the growth of the embryo.
Correct Answer: B — Promotes germination
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Q. What is the effect of heavy metals in the environment? (2023)
A.
Nutrient enrichment
B.
Toxicity to organisms
C.
Soil improvement
D.
Water purification
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Solution
Heavy metals can be toxic to organisms, leading to bioaccumulation and harmful effects on ecosystems.
Correct Answer: B — Toxicity to organisms
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Q. What is the effect of increasing pressure on a gas at constant temperature? (2014)
A.
Volume increases
B.
Volume decreases
C.
No effect on volume
D.
Gas becomes a liquid
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Solution
According to Boyle's Law, increasing pressure on a gas at constant temperature results in a decrease in volume.
Correct Answer: B — Volume decreases
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Q. What is the effect of increasing pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
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Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. In this case, it shifts to the right, producing more NH3.
Correct Answer: B — Shift to the right
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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 chemisorption? (2022)
A.
Increases adsorption
B.
Decreases adsorption
C.
No effect
D.
Depends on the gas
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Solution
Chemisorption is an exothermic process, and increasing temperature generally decreases the extent of chemisorption.
Correct Answer: B — Decreases adsorption
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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 volume of a gas at constant pressure?
A.
Volume decreases
B.
Volume increases
C.
Volume remains constant
D.
Volume fluctuates
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Solution
According to Charles's Law, increasing the temperature of a gas at constant pressure increases its volume.
Correct Answer: B — Volume increases
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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 on the current? (2022)
A.
Increases current
B.
Decreases current
C.
No effect
D.
Current becomes zero
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Solution
Increasing capacitance increases the current in a capacitive AC circuit, as current I = V/Xc.
Correct Answer: A — Increases current
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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 current in a coil on the magnetic field produced? (2022)
A.
Increases the magnetic field
B.
Decreases the magnetic field
C.
No effect
D.
Reverses the magnetic field
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Solution
Increasing the current in a coil increases the magnetic field produced by the coil.
Correct Answer: A — Increases the magnetic field
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Q. What is the effect of increasing the current in a solenoid on its magnetic field strength? (2021)
A.
Increases
B.
Decreases
C.
No effect
D.
Reverses direction
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Solution
Increasing the current in a solenoid increases its magnetic field strength, as the magnetic field is directly proportional to the current.
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 frequency on the capacitive reactance in an AC circuit? (2022)
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Capacitive reactance Xc = 1/(2πfC), so increasing frequency decreases Xc.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the impedance of a capacitor? (2023)
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes infinite
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Solution
The impedance of a capacitor decreases with increasing frequency.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the frequency on the total impedance of an RLC circuit? (2020)
A.
It always increases
B.
It always decreases
C.
It can increase or decrease
D.
It remains constant
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Solution
The total impedance can increase or decrease depending on the relationship between R, XL, and XC as frequency changes.
Correct Answer: C — It can increase or decrease
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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 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 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 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 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 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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