Q. What is the effect of increasing the number of turns in a coil on the induced EMF when the magnetic field changes?
A.
Induced EMF decreases
B.
Induced EMF remains the same
C.
Induced EMF increases
D.
Induced EMF becomes zero
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Solution
According to Faraday's law of electromagnetic induction, the induced EMF is proportional to the rate of change of magnetic flux and the number of turns in the coil. Increasing the number of turns increases the induced EMF.
Correct Answer: C — Induced EMF increases
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Q. What is the effect of increasing the number of turns in a coil on the induced EMF when the magnetic flux changes?
A.
It increases the induced EMF
B.
It decreases the induced EMF
C.
It has no effect
D.
It makes the induced EMF zero
Show solution
Solution
According to Faraday's law, the induced EMF is directly proportional to the number of turns in the coil. Therefore, increasing the number of turns increases the induced EMF.
Correct Answer: A — It increases the induced EMF
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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 produced by it?
A.
It decreases the magnetic field
B.
It has no effect
C.
It increases the magnetic field
D.
It reverses the magnetic field direction
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Solution
Increasing the number of turns in a coil increases the magnetic field produced, as the field is proportional to the number of turns.
Correct Answer: C — It increases the magnetic field
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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?
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 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 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 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 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
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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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Q. What is the effect of increasing the speed of a conductor moving through a magnetic field on the induced EMF?
A.
Increases the induced EMF
B.
Decreases the induced EMF
C.
No effect on the induced EMF
D.
Induced EMF becomes zero
Show solution
Solution
According to Faraday's law, the induced EMF is directly proportional to the rate of change of magnetic flux, which increases with speed.
Correct Answer: A — Increases the induced EMF
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Q. What is the effect of increasing the speed of a magnet moving through a coil?
A.
Induced current decreases
B.
Induced current increases
C.
No change in induced current
D.
Induced current becomes zero
Show solution
Solution
Increasing the speed of the magnet increases the rate of change of magnetic flux through the coil, which increases the induced current according to Faraday's law.
Correct Answer: B — Induced current increases
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Q. What is the effect of increasing the surface area of an object on its rate of heat transfer?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the material
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Solution
Increasing the surface area of an object increases the rate of heat transfer, as more area is available for heat exchange.
Correct Answer: A — Increases
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Q. What is the effect of increasing the surface area of an object on its rate of heat transfer by radiation?
A.
Decreases
B.
Increases
C.
Remains constant
D.
Becomes zero
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Solution
Increasing the surface area of an object increases the rate of heat transfer by radiation, as more surface is available for emitting energy.
Correct Answer: B — Increases
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Q. What is the effect of increasing the surface charge density on the electric field of a charged plane sheet?
A.
Increases
B.
Decreases
C.
No effect
D.
Becomes zero
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Solution
The electric field due to a charged plane sheet is directly proportional to the surface charge density; increasing σ increases E.
Correct Answer: A — Increases
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Q. What is the effect of increasing the surface roughness on the coefficient of friction?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the material
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Solution
Increasing surface roughness generally increases the coefficient of friction due to greater interlocking between the surfaces.
Correct Answer: A — Increases
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Q. What is the effect of increasing the temperature of a gas at constant volume?
A.
Pressure decreases
B.
Pressure increases
C.
Volume increases
D.
Density increases
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Solution
Increasing the temperature of a gas at constant volume results in an increase in pressure, according to Gay-Lussac's law.
Correct Answer: B — Pressure increases
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Q. What is the effect of increasing the temperature of a gas on its pressure, assuming volume is constant?
A.
Pressure decreases
B.
Pressure increases
C.
Pressure remains constant
D.
Pressure becomes zero
Show solution
Solution
Increasing the temperature of a gas at constant volume increases the pressure, as per Gay-Lussac's law.
Correct Answer: B — Pressure increases
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