Physics Syllabus (JEE Main)
Q. In a fluid flowing through a pipe, what effect does increasing the temperature have on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Depends on the fluid
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Solution
Increasing the temperature generally decreases the viscosity of a fluid, making it flow more easily.
Correct Answer: B — Decreases viscosity
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Q. In a fluid flowing through a pipe, which factor does NOT affect the viscosity?
A.
Temperature
B.
Pressure
C.
Fluid density
D.
Fluid composition
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Solution
While temperature, pressure, and fluid composition affect viscosity, fluid density does not directly affect viscosity.
Correct Answer: C — Fluid density
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Q. In a forced oscillation system, if the driving frequency is equal to the natural frequency, what phenomenon occurs?
A.
Damping
B.
Resonance
C.
Phase shift
D.
Destructive interference
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Solution
When the driving frequency equals the natural frequency, resonance occurs, leading to maximum amplitude.
Correct Answer: B — Resonance
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Q. In a forced oscillation system, the driving frequency is 5 Hz and the natural frequency is 4 Hz. What is the ratio of the driving frequency to the natural frequency?
A.
0.8
B.
1
C.
1.25
D.
1.5
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Solution
Ratio = driving frequency / natural frequency = 5 Hz / 4 Hz = 1.25.
Correct Answer: C — 1.25
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Q. In a forced oscillation system, what is the effect of increasing the amplitude of the driving force?
A.
Decreases the amplitude of oscillation
B.
Increases the amplitude of oscillation
C.
Has no effect on amplitude
D.
Causes the system to stop oscillating
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Solution
Increasing the amplitude of the driving force generally increases the amplitude of the oscillation in a forced system.
Correct Answer: B — Increases the amplitude of oscillation
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Q. In a forced oscillation, if the amplitude is doubled while keeping the driving frequency constant, what happens to the energy of the system?
A.
Increases by 2 times
B.
Increases by 4 times
C.
Remains the same
D.
Decreases
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Solution
Energy is proportional to the square of the amplitude, so if amplitude is doubled, energy increases by 2^2 = 4 times.
Correct Answer: B — Increases by 4 times
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Q. In a forced oscillation, if the amplitude is maximum, what can be said about the relationship between the driving frequency and the natural frequency?
A.
Driving frequency is less
B.
Driving frequency is equal
C.
Driving frequency is greater
D.
Driving frequency is unpredictable
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Solution
Maximum amplitude occurs when the driving frequency is equal to the natural frequency.
Correct Answer: B — Driving frequency is equal
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Q. In a forced oscillation, if the amplitude of the oscillation is directly proportional to the driving force, what is the relationship called?
A.
Hooke's Law
B.
Newton's Law
C.
Resonance
D.
Steady state
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Solution
In forced oscillations, the amplitude is directly proportional to the driving force in the steady state.
Correct Answer: D — Steady state
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Q. In a forced oscillation, the driving frequency is 2 Hz and the natural frequency of the system is 1.5 Hz. What is the ratio of the driving frequency to the natural frequency?
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Solution
Ratio = driving frequency / natural frequency = 2 / 1.5 = 1.33
Correct Answer: C — 1.33
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Q. In a forced oscillation, what happens when the driving frequency matches the natural frequency of the system?
A.
The system oscillates with minimum amplitude
B.
The system oscillates with maximum amplitude
C.
The system stops oscillating
D.
The system oscillates at a different frequency
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Solution
When the driving frequency matches the natural frequency, resonance occurs, leading to maximum amplitude.
Correct Answer: B — The system oscillates with maximum amplitude
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Q. In a forced oscillation, what happens when the driving frequency matches the natural frequency?
A.
The system oscillates with minimum amplitude
B.
The system oscillates with maximum amplitude
C.
The system stops oscillating
D.
The system oscillates at a different frequency
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Solution
When the driving frequency matches the natural frequency, resonance occurs, leading to maximum amplitude.
Correct Answer: B — The system oscillates with maximum amplitude
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Q. In a forced oscillation, what is the effect of increasing the amplitude of the driving force?
A.
Decreases the amplitude of oscillation
B.
Increases the amplitude of oscillation
C.
Has no effect on amplitude
D.
Causes the system to stop oscillating
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Solution
Increasing the amplitude of the driving force generally increases the amplitude of the forced oscillation.
Correct Answer: B — Increases the amplitude of oscillation
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Q. In a forced oscillation, what is the effect of resonance?
A.
Amplitude decreases
B.
Amplitude increases significantly
C.
Frequency decreases
D.
Phase difference becomes zero
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Solution
At resonance, the driving frequency matches the natural frequency of the system, leading to a significant increase in amplitude.
Correct Answer: B — Amplitude increases significantly
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Q. In a forced oscillation, what is the term for the maximum amplitude achieved at resonance?
A.
Resonance peak
B.
Damping peak
C.
Natural frequency
D.
Driving frequency
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Solution
The maximum amplitude achieved at resonance is referred to as the resonance peak.
Correct Answer: A — Resonance peak
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Q. In a gas mixture, the total pressure is equal to the sum of the partial pressures of the individual gases. This is known as:
A.
Dalton's Law
B.
Boyle's Law
C.
Charles's Law
D.
Ideal Gas Law
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Solution
This principle is known as Dalton's Law of Partial Pressures.
Correct Answer: A — Dalton's Law
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Q. In a gas mixture, what is the partial pressure of a gas?
A.
Total pressure of the mixture
B.
Pressure exerted by the gas alone
C.
Pressure exerted by all gases
D.
Pressure at absolute zero
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Solution
The partial pressure of a gas in a mixture is the pressure that gas would exert if it occupied the entire volume alone.
Correct Answer: B — Pressure exerted by the gas alone
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Q. In a gas mixture, which law can be used to find the total pressure exerted by the gases?
A.
Dalton's Law of Partial Pressures
B.
Boyle's Law
C.
Charles's Law
D.
Ideal Gas Law
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Solution
Dalton's Law of Partial Pressures states that the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each gas.
Correct Answer: A — Dalton's Law of Partial Pressures
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Q. In a gas, if the volume is halved while keeping the temperature constant, what happens to the pressure?
A.
It remains the same.
B.
It doubles.
C.
It halves.
D.
It quadruples.
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Solution
According to Boyle's Law, if the volume is halved while keeping the temperature constant, the pressure doubles.
Correct Answer: B — It doubles.
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Q. In a gas, the distribution of molecular speeds is described by which law?
A.
Maxwell-Boltzmann distribution
B.
Bernoulli's principle
C.
Boyle's law
D.
Charles's law
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Solution
The distribution of molecular speeds in a gas is described by the Maxwell-Boltzmann distribution.
Correct Answer: A — Maxwell-Boltzmann distribution
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Q. In a gas, the mean free path is defined as the average distance traveled by a molecule between collisions. Which factor does NOT affect the mean free path?
A.
Temperature
B.
Pressure
C.
Molecular diameter
D.
Color of the gas
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Solution
The mean free path is affected by temperature, pressure, and molecular diameter, but not by the color of the gas.
Correct Answer: D — Color of the gas
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Q. In a generator, if the speed of rotation is doubled, what happens to the induced EMF?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It becomes zero
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Solution
The induced EMF in a generator is directly proportional to the speed of rotation. Therefore, if the speed is doubled, the induced EMF also doubles.
Correct Answer: A — It doubles
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Q. In a generator, mechanical energy is converted into electrical energy through the principle of:
A.
Electrostatics
B.
Electromagnetic induction
C.
Thermodynamics
D.
Optics
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Solution
In a generator, mechanical energy is converted into electrical energy through the principle of electromagnetic induction, as the motion of conductors in a magnetic field induces an EMF.
Correct Answer: B — Electromagnetic induction
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Q. In a generator, mechanical energy is converted into electrical energy through which process?
A.
Electromagnetic induction
B.
Thermal conduction
C.
Photoelectric effect
D.
Electrolysis
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Solution
In a generator, mechanical energy is converted into electrical energy through the process of electromagnetic induction.
Correct Answer: A — Electromagnetic induction
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Q. In a generator, mechanical energy is converted into electrical energy through which principle?
A.
Electromagnetic induction
B.
Thermal conduction
C.
Photoelectric effect
D.
Capacitance
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Solution
In a generator, mechanical energy is converted into electrical energy through the principle of electromagnetic induction.
Correct Answer: A — Electromagnetic induction
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Q. In a generator, what is the role of the rotating coil in a magnetic field?
A.
To create a magnetic field
B.
To induce current
C.
To store energy
D.
To measure voltage
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Solution
In a generator, the rotating coil in a magnetic field induces current through electromagnetic induction, converting mechanical energy into electrical energy.
Correct Answer: B — To induce current
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Q. In a gravitational field, the potential energy of an object is maximum at which point?
A.
At the surface of the Earth
B.
At infinity
C.
At the center of the Earth
D.
At the highest point in the field
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Solution
The gravitational potential energy is considered maximum at infinity, where it is defined to be zero.
Correct Answer: B — At infinity
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Q. In a harmonic oscillator, the total mechanical energy is constant. What is the form of this energy?
A.
Kinetic energy only
B.
Potential energy only
C.
Sum of kinetic and potential energy
D.
None of the above
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Solution
In a harmonic oscillator, the total mechanical energy is the sum of kinetic and potential energy, which remains constant over time.
Correct Answer: C — Sum of kinetic and potential energy
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Q. In a heat engine, if the input heat is 800 J and the work output is 300 J, what is the efficiency?
A.
37.5%
B.
50%
C.
62.5%
D.
75%
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Solution
Efficiency = (Work output / Heat input) × 100 = (300 J / 800 J) × 100 = 37.5%.
Correct Answer: C — 62.5%
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Q. In a heat engine, if the work done is 200 J and the heat absorbed is 500 J, what is the efficiency?
A.
40%
B.
50%
C.
60%
D.
80%
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Solution
Efficiency = (Work done / Heat absorbed) * 100 = (200 J / 500 J) * 100 = 40%.
Correct Answer: B — 50%
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Q. In a heat engine, if the work output is 200 J and the heat input is 600 J, what is the efficiency?
A.
33.33%
B.
50%
C.
66.67%
D.
75%
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Solution
Efficiency = (Work output / Heat input) × 100 = (200 J / 600 J) × 100 = 33.33%.
Correct Answer: C — 66.67%
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