Q. What is the effect of increasing the number of turns in a coil on the magnetic field produced?
A.
Increases
B.
Decreases
C.
No effect
D.
Reverses
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Solution
Increasing the number of turns increases the magnetic field strength.
Correct Answer: A — Increases
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Q. What is the effect of increasing the number of turns in a coil on the magnetic field strength produced by it? (2022)
A.
Increases the field strength
B.
Decreases the field strength
C.
No effect
D.
Reverses the field direction
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Solution
Increasing the number of turns in a coil increases the magnetic field strength produced by it, as the field strength is directly proportional to the number of turns.
Correct Answer: A — Increases the field strength
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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 number of turns in a solenoid on the magnetic field inside it?
A.
Magnetic field decreases
B.
Magnetic field remains constant
C.
Magnetic field increases
D.
Magnetic field becomes zero
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Solution
The magnetic field inside a solenoid is directly proportional to the number of turns per unit length. Increasing the number of turns increases the magnetic field strength.
Correct Answer: C — Magnetic field increases
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Q. What is the effect of increasing the object distance on the size of the image formed by a convex lens?
A.
Image size increases
B.
Image size decreases
C.
Image size remains constant
D.
Image size becomes zero
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Solution
As the object distance increases, the size of the image formed by a convex lens increases until it reaches a maximum.
Correct Answer: A — Image size increases
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Q. What is the effect of increasing the permittivity of the medium on the electric field due to a point charge?
A.
Electric field increases
B.
Electric field decreases
C.
Electric field remains the same
D.
Electric field becomes zero
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Solution
Increasing the permittivity of the medium decreases the electric field due to a point charge, as E = Q/(4πε₀r²).
Correct Answer: B — Electric field decreases
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Q. What is the effect of increasing the plate area of a capacitor on its capacitance?
A.
Capacitance increases
B.
Capacitance decreases
C.
Capacitance remains the same
D.
Capacitance becomes zero
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Solution
Increasing the plate area A of a capacitor increases its capacitance, as C is directly proportional to A.
Correct Answer: A — Capacitance increases
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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 plate area of a parallel plate capacitor?
A.
Capacitance decreases
B.
Capacitance increases
C.
Capacitance remains the same
D.
Capacitance becomes zero
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Solution
Increasing the plate area A of a parallel plate capacitor increases its capacitance, as C = ε₀ * A / d.
Correct Answer: B — Capacitance increases
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Q. What is the effect of increasing the pressure of a gas at constant temperature on its RMS speed?
A.
Increases RMS speed
B.
Decreases RMS speed
C.
No effect on RMS speed
D.
Depends on the gas
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Solution
At constant temperature, increasing pressure does not affect the RMS speed, as it is dependent on temperature and molar mass.
Correct Answer: C — No effect on RMS speed
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Q. What is the effect of increasing the pressure of a gas at constant volume on its RMS speed?
A.
Increases RMS speed
B.
Decreases RMS speed
C.
No effect on RMS speed
D.
Depends on the gas
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Solution
At constant volume, increasing pressure increases the temperature of the gas, which in turn increases the RMS speed.
Correct Answer: A — Increases RMS speed
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Q. What is the effect of increasing the pressure on the equilibrium of the reaction: 2N2(g) + 3H2(g) ⇌ 2NH3(g)?
A.
Shifts to the left
B.
Shifts to the right
C.
No effect
D.
Increases the rate of reaction
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Solution
Increasing the pressure will shift the equilibrium to the right, favoring the formation of NH3, as there are fewer moles of gas on the product side.
Correct Answer: B — Shifts to the right
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Q. What is the effect of increasing the pressure on the rate of a reaction involving gaseous reactants?
A.
Rate decreases
B.
Rate increases
C.
No effect
D.
Depends on the reaction
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Solution
Increasing the pressure increases the concentration of gaseous reactants, which generally increases the rate of reaction.
Correct Answer: B — Rate increases
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Q. What is the effect of increasing the radius of a circular loop carrying current on the magnetic field at its center?
A.
It increases the magnetic field
B.
It decreases the magnetic field
C.
It has no effect
D.
It reverses the direction of the magnetic field
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Solution
The magnetic field at the center of a circular loop is inversely proportional to the radius; thus, increasing the radius decreases the magnetic field.
Correct Answer: B — It decreases the magnetic field
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Q. What is the effect of increasing the radius of a circular loop on the magnetic field at its center?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The magnetic field at the center of a circular loop decreases as the radius increases.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the radius of a spherical Gaussian surface enclosing a fixed charge?
A.
Electric field increases.
B.
Electric field decreases.
C.
Electric field remains constant.
D.
Electric field becomes zero.
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Solution
The electric field due to a point charge decreases with distance, but the total flux remains constant as the charge is fixed.
Correct Answer: C — Electric field remains constant.
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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 resistance in a series AC circuit?
A.
Increases current
B.
Decreases current
C.
No effect
D.
Increases voltage
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Solution
Increasing the resistance in a series AC circuit decreases the current.
Correct Answer: B — Decreases current
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Q. What is the effect of increasing the resistance in a series RLC circuit on the Q factor?
A.
Increases Q factor
B.
Decreases Q factor
C.
No effect
D.
Doubles Q factor
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Solution
Increasing resistance decreases the Q factor, which is defined as Q = ωL/R.
Correct Answer: B — Decreases Q factor
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Q. What is the effect of increasing the resistance in an AC circuit on the overall current?
A.
Increases current
B.
Decreases current
C.
No effect
D.
Doubles current
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Solution
According to Ohm's law, increasing resistance in an AC circuit decreases the overall current.
Correct Answer: B — Decreases current
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Q. What is the effect of increasing the resistance in the circuit of a potentiometer?
A.
Increases the current
B.
Decreases the current
C.
No effect on current
D.
Increases the emf
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Solution
Increasing the resistance in the circuit decreases the current according to Ohm's law.
Correct Answer: B — Decreases the current
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Q. What is the effect of increasing the resistance of the potentiometer wire on the potential gradient?
A.
It increases the potential gradient
B.
It decreases the potential gradient
C.
It has no effect
D.
It depends on the voltage applied
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Solution
Increasing the resistance of the potentiometer wire while keeping the voltage constant decreases the current, which in turn decreases the potential gradient.
Correct Answer: B — It decreases the potential gradient
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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 atom on the reactivity of haloalkanes?
A.
Increases reactivity
B.
Decreases reactivity
C.
No effect
D.
Depends on the solvent
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Solution
Increasing the size of the halogen atom generally increases the reactivity of haloalkanes due to the weaker C-X bond.
Correct Answer: A — Increases reactivity
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Q. What is the effect of increasing the size of the halogen in haloalkanes on the bond strength?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Varies randomly
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Solution
As the size of the halogen increases, the bond strength decreases due to the longer bond length and weaker overlap.
Correct Answer: B — Decreases
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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 double-slit experiment on the interference pattern?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe visibility increases
D.
Fringe visibility decreases
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Solution
Increasing the slit width reduces the coherence of the light waves, leading to decreased fringe visibility.
Correct Answer: D — Fringe visibility decreases
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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 slit width in single-slit diffraction?
A.
Increases the width of the central maximum
B.
Decreases the width of the central maximum
C.
No effect on the central maximum
D.
Increases the intensity of the central maximum
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Solution
Increasing the slit width decreases the width of the central maximum due to the diffraction pattern becoming narrower.
Correct Answer: B — Decreases the width of the central maximum
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Q. What is the effect of increasing the speed of a charged particle moving in a magnetic field?
A.
Increases the magnetic force
B.
Decreases the magnetic force
C.
No effect on the magnetic force
D.
Reverses the direction of the force
Show solution
Solution
The magnetic force on a charged particle is proportional to its speed; increasing the speed increases the magnetic force.
Correct Answer: A — Increases the magnetic force
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