Major Competitive Exams
Q. What is the effect of increasing tension on the speed of a wave traveling along a string?
A.
Increases speed
B.
Decreases speed
C.
No effect
D.
Depends on the mass
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Solution
Increasing tension in the string increases the speed of the wave.
Correct Answer: A — Increases speed
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Q. What is the effect of increasing the altitude of a satellite on its orbital period?
A.
It decreases
B.
It increases
C.
It remains the same
D.
It becomes zero
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Solution
According to Kepler's third law, increasing the altitude of a satellite increases its orbital period.
Correct Answer: B — It increases
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Q. What is the effect of increasing the amplitude of a sound wave?
A.
Increases pitch
B.
Increases loudness
C.
Decreases frequency
D.
Decreases speed
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Solution
Increasing the amplitude of a sound wave increases its loudness.
Correct Answer: B — Increases loudness
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Q. What is the effect of increasing the amplitude of a wave?
A.
Increases frequency
B.
Increases speed
C.
Increases energy
D.
Decreases wavelength
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Solution
Increasing the amplitude of a wave increases its energy, as energy is proportional to the square of the amplitude.
Correct Answer: C — Increases energy
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Q. What is the effect of increasing the angle of incidence beyond the critical angle in total internal reflection?
A.
Increased intensity of reflected light
B.
Decreased intensity of reflected light
C.
No effect on intensity
D.
Light is transmitted into the second medium
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Solution
Increasing the angle of incidence beyond the critical angle increases the intensity of the reflected light due to total internal reflection.
Correct Answer: A — Increased intensity of reflected light
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Q. What is the effect of increasing the angle of incidence beyond the critical angle?
A.
Increased refraction
B.
Decreased reflection
C.
Total internal reflection
D.
No effect
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Solution
Increasing the angle of incidence beyond the critical angle results in total internal reflection, preventing any refraction into the second medium.
Correct Answer: C — Total internal reflection
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Q. What is the effect of increasing the area of a loop in a uniform magnetic field on the magnetic flux?
A.
Magnetic flux increases
B.
Magnetic flux decreases
C.
Magnetic flux remains constant
D.
Magnetic flux becomes zero
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Solution
Increasing the area of the loop in a uniform magnetic field increases the magnetic flux, as magnetic flux is given by the product of the magnetic field strength and the area.
Correct Answer: A — Magnetic flux 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 bandwidth of a communication channel?
A.
Increased data rate
B.
Decreased data rate
C.
No effect on data rate
D.
Increased noise
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Solution
Increasing the bandwidth allows for a higher data rate.
Correct Answer: A — Increased data rate
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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 capacitance in a capacitor in an AC circuit on the current?
A.
Increases current
B.
Decreases current
C.
No effect
D.
Current becomes zero
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Solution
Increasing the capacitance (C) decreases the capacitive reactance (X_C), which increases the current (I) in the circuit.
Correct Answer: A — Increases current
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Q. What is the effect of increasing the capacitance in an AC circuit on the capacitive reactance?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
Capacitive reactance (X_C) is given by X_C = 1/(2πfC). Increasing capacitance (C) decreases X_C.
Correct Answer: B — Decreases
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Q. What is the effect of increasing the capacitance in an AC circuit on the phase angle between voltage and current?
A.
Increases phase angle
B.
Decreases phase angle
C.
No effect
D.
Phase angle becomes 90 degrees
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Solution
Increasing capacitance decreases the phase angle between voltage and current in an AC circuit.
Correct Answer: B — Decreases phase angle
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Q. What is the effect of increasing the carbon chain length on the acidity of carboxylic acids?
A.
Increases acidity
B.
Decreases acidity
C.
No effect
D.
Varies with structure
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Solution
Increasing the carbon chain length generally decreases the acidity of carboxylic acids due to the inductive effect.
Correct Answer: B — Decreases acidity
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Q. What is the effect of increasing the carbon chain length on the boiling point of aldehydes?
A.
Decreases
B.
Increases
C.
Remains the same
D.
Varies randomly
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Solution
The boiling point of aldehydes increases with the increase in carbon chain length due to increased van der Waals forces.
Correct Answer: B — Increases
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Q. What is the effect of increasing the concentration of a reactant in a first-order reaction?
A.
Rate increases linearly
B.
Rate decreases
C.
Rate remains constant
D.
Rate increases exponentially
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Solution
In a first-order reaction, increasing the concentration of a reactant results in a linear increase in the rate.
Correct Answer: A — Rate increases linearly
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Q. What is the effect of increasing the concentration of a solute on the freezing point of a solution?
A.
Freezing point increases
B.
Freezing point decreases
C.
No effect
D.
Depends on the solute
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Solution
Increasing the concentration of a solute lowers the freezing point of a solution.
Correct Answer: B — Freezing point decreases
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Q. What is the effect of increasing the concentration of reactants on the rate of a reaction?
A.
Rate decreases
B.
Rate increases
C.
Rate remains constant
D.
Rate becomes zero
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Solution
Increasing the concentration of reactants generally increases the rate of a reaction.
Correct Answer: B — Rate increases
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Q. What is the effect of increasing the cross-sectional area of a conductor on its resistance?
A.
Increases resistance
B.
Decreases resistance
C.
No effect
D.
Depends on the material
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Solution
Increasing the cross-sectional area decreases the resistance, as R = ρ * (L / A).
Correct Answer: B — Decreases resistance
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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 coil on the magnetic field strength?
A.
Increases
B.
Decreases
C.
No effect
D.
Depends on the coil material
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Solution
Increasing the current in a coil increases the 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 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 current in a solenoid on the magnetic field inside it?
A.
Increases
B.
Decreases
C.
Remains the same
D.
Becomes zero
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Solution
The magnetic field inside a solenoid is directly proportional to the current flowing through it. Therefore, increasing the current increases the magnetic field strength.
Correct Answer: A — Increases
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Q. What is the effect of increasing the current in a solenoid on the magnetic field strength?
A.
Decreases the magnetic field strength
B.
Increases the magnetic field strength
C.
Has no effect
D.
Reverses the magnetic field direction
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Solution
Increasing the current in a solenoid increases the magnetic field strength, as B is directly proportional to I.
Correct Answer: B — Increases the magnetic field strength
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Q. What is the effect of increasing the current in a solenoid on the magnetic field strength inside it?
A.
Increases the magnetic field strength
B.
Decreases the magnetic field strength
C.
No effect on the magnetic field strength
D.
Reverses the direction of the magnetic field
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Solution
According to Ampere's Law, increasing the current in a solenoid increases the magnetic field strength inside it.
Correct Answer: A — Increases the magnetic field strength
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Q. What is the effect of increasing the current in a wire on the magnetic field around it?
A.
Increases the magnetic field
B.
Decreases the magnetic field
C.
No effect on the magnetic field
D.
Reverses the direction of the magnetic field
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Solution
Increasing the current in a wire increases the magnetic field around it, as per the Biot-Savart Law.
Correct Answer: A — Increases the magnetic field
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Q. What is the effect of increasing the curvature of a lens on its focal length?
A.
Focal length increases
B.
Focal length decreases
C.
Focal length remains the same
D.
Focal length becomes zero
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Solution
Increasing the curvature of a lens decreases its focal length.
Correct Answer: B — Focal length decreases
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Q. What is the effect of increasing the damping coefficient on the amplitude of oscillation in a damped oscillator?
A.
Increases amplitude
B.
Decreases amplitude
C.
No effect
D.
Doubles amplitude
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Solution
Increasing the damping coefficient decreases the amplitude of oscillation in a damped oscillator.
Correct Answer: B — Decreases amplitude
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Q. What is the effect of increasing the diameter of the potentiometer wire on its resistance?
A.
Resistance increases
B.
Resistance decreases
C.
Resistance remains the same
D.
Resistance becomes zero
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Solution
Increasing the diameter of the potentiometer wire decreases its resistance, as resistance is inversely proportional to the cross-sectional area of the wire.
Correct Answer: B — Resistance decreases
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