Q. What is the direction of the magnetic field produced by a current-carrying loop using the right-hand rule?
A.
Clockwise
B.
Counterclockwise
C.
Out of the plane
D.
Into the plane
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Solution
Using the right-hand rule, the thumb points in the direction of current, and the fingers curl in the direction of the magnetic field.
Correct Answer: C — Out of the plane
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Q. What is the direction of the magnetic field produced by a current-carrying loop at its center?
A.
Perpendicular to the plane of the loop
B.
In the plane of the loop
C.
Radially outward from the loop
D.
Radially inward towards the loop
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Solution
The magnetic field produced by a current-carrying loop at its center is perpendicular to the plane of the loop, following the right-hand rule.
Correct Answer: A — Perpendicular to the plane of the loop
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Q. What is the direction of the magnetic field produced by a current-carrying wire according to the Biot-Savart Law?
A.
Along the wire
B.
Perpendicular to the wire and the current
C.
In the direction of the current
D.
Opposite to the direction of the current
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Solution
The direction of the magnetic field produced by a current-carrying wire is perpendicular to both the wire and the direction of the current.
Correct Answer: B — Perpendicular to the wire and the current
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Q. What is the direction of the magnetic field produced by a current-carrying wire according to the right-hand rule?
A.
Towards the wire
B.
Away from the wire
C.
Perpendicular to the wire in the direction of current
D.
Perpendicular to the wire in the opposite direction of current
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Solution
According to the right-hand rule, if you point your thumb in the direction of the current, your fingers curl in the direction of the magnetic field.
Correct Answer: C — Perpendicular to the wire in the direction of current
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Q. What is the direction of the magnetic field produced by a current-carrying wire using the right-hand rule?
A.
Towards the wire
B.
Away from the wire
C.
Clockwise
D.
Counterclockwise
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Solution
Using the right-hand rule, the magnetic field direction is counterclockwise around the wire.
Correct Answer: D — Counterclockwise
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Q. What is the Doppler effect?
A.
Change in frequency due to motion
B.
Change in amplitude due to distance
C.
Change in speed due to temperature
D.
Change in wavelength due to pressure
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Solution
The Doppler effect refers to the change in frequency of a wave in relation to an observer moving relative to the wave source.
Correct Answer: A — Change in frequency due to motion
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Q. What is the effect called when two sound waves of slightly different frequencies interfere?
A.
Doppler effect
B.
Beats
C.
Resonance
D.
Echo
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Solution
The phenomenon of two sound waves of slightly different frequencies interfering is called beats.
Correct Answer: B — Beats
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Q. What is the effect of a dielectric material on the electric field between the plates of a parallel plate capacitor?
A.
Increases the electric field
B.
Decreases the electric field
C.
Has no effect
D.
Reverses the electric field direction
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Solution
Inserting a dielectric material between the plates of a capacitor decreases the electric field due to polarization.
Correct Answer: B — Decreases the electric field
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Q. What is the effect of a dielectric material on the electric field inside a capacitor?
A.
Increases the electric field
B.
Decreases the electric field
C.
Has no effect
D.
Reverses the electric field direction
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Solution
Inserting a dielectric material into a capacitor decreases the electric field inside the capacitor due to polarization.
Correct Answer: B — Decreases the electric field
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Q. What is the effect of a magnetic field on a charged particle moving perpendicular to the field?
A.
It accelerates the particle in the direction of the field
B.
It causes the particle to move in a circular path
C.
It stops the particle
D.
It has no effect
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Solution
A charged particle moving perpendicular to a magnetic field experiences a magnetic force that acts perpendicular to both the velocity and the magnetic field, causing it to move in a circular path.
Correct Answer: B — It causes the particle to move in a circular path
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Q. What is the effect of a magnetic field on a current-carrying conductor placed in it?
A.
It experiences no force
B.
It experiences a force
C.
It heats up
D.
It becomes magnetized
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Solution
A current-carrying conductor placed in a magnetic field experiences a force due to the interaction between the magnetic field and the current.
Correct Answer: B — It experiences a force
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Q. What is the effect of a magnetic field on a stationary charge?
A.
Force acts on the charge
B.
No force acts on the charge
C.
Charge accelerates
D.
Charge decelerates
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Solution
A magnetic field exerts a force only on moving charges; therefore, a stationary charge experiences no force.
Correct Answer: B — No force acts on the charge
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Q. What is the effect of a polarizer on unpolarized light?
A.
It increases the intensity
B.
It decreases the intensity
C.
It does not change the intensity
D.
It changes the color
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Solution
A polarizer decreases the intensity of unpolarized light by allowing only a certain orientation of light waves to pass through.
Correct Answer: B — It decreases the intensity
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Q. What is the effect of a quarter-wave plate on polarized light?
A.
It reflects the light
B.
It changes the polarization direction
C.
It converts linearly polarized light to circularly polarized light
D.
It absorbs the light
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Solution
A quarter-wave plate converts linearly polarized light into circularly polarized light by introducing a phase shift of 90 degrees.
Correct Answer: C — It converts linearly polarized light to circularly polarized light
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Q. What is the effect of a second polarizer oriented at 90 degrees to the first polarizer on the transmitted light intensity?
A.
It increases the intensity
B.
It decreases the intensity to zero
C.
It has no effect
D.
It doubles the intensity
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Solution
When a second polarizer is oriented at 90 degrees to the first, it blocks all the light, reducing the intensity to zero.
Correct Answer: B — It decreases the intensity to zero
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Q. What is the effect of a second polarizer oriented at 90 degrees to the first?
A.
No light passes through
B.
All light passes through
C.
Half of the light passes through
D.
Light intensity doubles
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Solution
When a second polarizer is oriented at 90 degrees to the first, no light passes through.
Correct Answer: A — No light passes through
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Q. What is the effect of a second polarizer placed at 90 degrees to the first polarizer on the intensity of light?
A.
It increases the intensity
B.
It decreases the intensity to zero
C.
It has no effect
D.
It doubles the intensity
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Solution
When light passes through a second polarizer at 90 degrees to the first, the intensity is reduced to zero.
Correct Answer: B — It decreases the intensity to zero
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Q. What is the effect of adding a solute to a solvent on the viscosity of the solution?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the solute
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Solution
Adding a solute to a solvent typically increases the viscosity of the solution due to the interactions between solute and solvent molecules.
Correct Answer: A — Increases viscosity
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Q. What is the effect of adding salt to water on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on temperature
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Solution
Adding salt to water generally increases its viscosity.
Correct Answer: A — Increases viscosity
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Q. What is the effect of atmospheric drag on satellites in low Earth orbit?
A.
It increases their speed.
B.
It decreases their speed.
C.
It has no effect.
D.
It causes them to gain altitude.
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Solution
Atmospheric drag decreases the speed of satellites in low Earth orbit, leading to a gradual decrease in altitude.
Correct Answer: B — It decreases their speed.
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Q. What is the effect of damping on the amplitude of an oscillating system?
A.
Amplitude increases with time
B.
Amplitude remains constant
C.
Amplitude decreases with time
D.
Amplitude becomes zero instantly
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Solution
Damping causes the amplitude of oscillations to decrease over time due to energy loss.
Correct Answer: C — Amplitude decreases with time
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Q. What is the effect of damping on the energy of an oscillating system?
A.
Energy increases
B.
Energy remains constant
C.
Energy decreases over time
D.
Energy oscillates
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Solution
Damping causes the energy of the oscillating system to decrease over time due to energy loss.
Correct Answer: C — Energy decreases over time
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Q. What is the effect of dielectric material on capacitance?
A.
Increases capacitance
B.
Decreases capacitance
C.
No effect
D.
Depends on the charge
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Solution
The presence of a dielectric material increases the capacitance of a capacitor.
Correct Answer: A — Increases capacitance
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Q. What is the effect of dielectric material on the capacitance of a capacitor?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The presence of a dielectric material increases the capacitance of a capacitor.
Correct Answer: A — Increases
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Q. What is the effect of doping a semiconductor with acceptor impurities?
A.
Increases electron concentration
B.
Increases hole concentration
C.
Decreases conductivity
D.
No effect
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Solution
Doping with acceptor impurities creates holes, thus increasing the hole concentration in the semiconductor.
Correct Answer: B — Increases hole concentration
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Q. What is the effect of doping a semiconductor with donor atoms?
A.
Increases hole concentration
B.
Increases electron concentration
C.
Decreases conductivity
D.
Creates a depletion region
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Solution
Doping a semiconductor with donor atoms increases the electron concentration, making it n-type.
Correct Answer: B — Increases electron concentration
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Q. What is the effect of doping a semiconductor with trivalent atoms?
A.
Creates n-type
B.
Creates p-type
C.
No effect
D.
Increases resistance
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Solution
Doping a semiconductor with trivalent atoms creates p-type semiconductors by introducing holes.
Correct Answer: B — Creates p-type
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Q. What is the effect of doping a semiconductor?
A.
Increases resistance
B.
Decreases resistance
C.
No effect
D.
Makes it an insulator
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Solution
Doping a semiconductor decreases its resistance by introducing additional charge carriers.
Correct Answer: B — Decreases resistance
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Q. What is the effect of doping on the conductivity of a semiconductor?
A.
Decreases conductivity
B.
Increases conductivity
C.
No effect
D.
Makes it an insulator
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Solution
Doping a semiconductor increases its conductivity by introducing additional charge carriers.
Correct Answer: B — Increases conductivity
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Q. What is the effect of doping on the conductivity of semiconductors?
A.
Decreases conductivity
B.
Increases conductivity
C.
No effect
D.
Makes it insulative
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Solution
Doping increases the conductivity of semiconductors by introducing additional charge carriers.
Correct Answer: B — Increases conductivity
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