Physics Syllabus (JEE Main)
Q. Which of the following correctly describes the gravitational force?
A.
It is always attractive
B.
It can be repulsive
C.
It acts only at short distances
D.
It is stronger than electromagnetic force
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Solution
The gravitational force is always attractive and acts over long distances, though it is weaker than the electromagnetic force.
Correct Answer: A — It is always attractive
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Q. Which of the following correctly describes the relationship between gravitational potential and gravitational field?
A.
Potential is the derivative of field.
B.
Field is the derivative of potential.
C.
Both are independent.
D.
They are equal.
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Solution
The gravitational field is the negative gradient of gravitational potential.
Correct Answer: B — Field is the derivative of potential.
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Q. Which of the following describes circular polarization?
A.
Waves oscillate in a straight line
B.
Waves oscillate in a plane at a constant angle
C.
Waves rotate in a circular motion as they propagate
D.
Waves are randomly oriented
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Solution
In circular polarization, the electric field vector rotates in a circular motion as the wave propagates.
Correct Answer: C — Waves rotate in a circular motion as they propagate
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Q. Which of the following describes overdamped oscillations?
A.
System oscillates with decreasing amplitude
B.
System returns to equilibrium without oscillating
C.
System oscillates indefinitely
D.
System oscillates with constant amplitude
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Solution
In overdamped oscillations, the system returns to equilibrium without oscillating due to strong damping.
Correct Answer: B — System returns to equilibrium without oscillating
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Q. Which of the following describes Poisson's ratio?
A.
Lateral strain / Longitudinal strain
B.
Longitudinal strain / Lateral strain
C.
Stress / Strain
D.
Strain / Stress
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Solution
Poisson's ratio (ν) is defined as the ratio of lateral strain to longitudinal strain.
Correct Answer: A — Lateral strain / Longitudinal strain
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Q. Which of the following describes the behavior of a Zener diode?
A.
Acts as a regular diode
B.
Allows current to flow in both directions
C.
Maintains a constant voltage
D.
Has no breakdown voltage
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Solution
A Zener diode is designed to maintain a constant voltage across it when reverse-biased, allowing it to regulate voltage.
Correct Answer: C — Maintains a constant voltage
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Q. Which of the following describes the behavior of gases?
A.
They have a definite shape
B.
They have a definite volume
C.
They expand to fill their container
D.
They are incompressible
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Solution
Gases have no definite shape or volume and will expand to fill the entire volume of their container.
Correct Answer: C — They expand to fill their container
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Q. Which of the following describes 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. Which of the following describes the motion of a damped oscillator mathematically?
A.
x(t) = A cos(ωt)
B.
x(t) = A e^(-bt) cos(ωt)
C.
x(t) = A sin(ωt)
D.
x(t) = A e^(bt) cos(ωt)
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Solution
The motion of a damped oscillator is described by x(t) = A e^(-bt) cos(ωt), where b is the damping coefficient.
Correct Answer: B — x(t) = A e^(-bt) cos(ωt)
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Q. Which of the following describes the motion of a damped oscillator?
A.
Simple harmonic motion
B.
Exponential decay
C.
Linear motion
D.
Circular motion
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Solution
The motion of a damped oscillator is characterized by exponential decay of amplitude over time.
Correct Answer: B — Exponential decay
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Q. Which of the following describes the motion of a system undergoing overdamping?
A.
Returns to equilibrium position quickly
B.
Oscillates with decreasing amplitude
C.
Returns to equilibrium position slowly without oscillating
D.
Oscillates indefinitely
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Solution
In overdamping, the system returns to the equilibrium position slowly without oscillating.
Correct Answer: C — Returns to equilibrium position slowly without oscillating
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Q. Which of the following describes the polarization of light?
A.
Light waves oscillate in all directions
B.
Light waves oscillate in a single plane
C.
Light waves oscillate in a circular motion
D.
Light waves do not oscillate
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Solution
Polarization of light refers to the phenomenon where light waves oscillate in a single plane.
Correct Answer: B — Light waves oscillate in a single plane
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Q. Which of the following describes the relationship between frequency and pitch?
A.
Higher frequency means lower pitch
B.
Lower frequency means higher pitch
C.
Higher frequency means higher pitch
D.
Frequency has no effect on pitch
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Solution
Higher frequency corresponds to a higher pitch in sound.
Correct Answer: C — Higher frequency means higher pitch
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Q. Which of the following describes viscosity?
A.
Resistance to flow
B.
Density of a fluid
C.
Surface tension
D.
Pressure exerted by a fluid
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Solution
Viscosity is a measure of a fluid's resistance to flow.
Correct Answer: A — Resistance to flow
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Q. Which of the following devices is based on the principle of semiconductors?
A.
Transformer
B.
Capacitor
C.
Transistor
D.
Inductor
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Solution
A transistor is a semiconductor device that can amplify or switch electronic signals and electrical power.
Correct Answer: C — Transistor
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Q. Which of the following equations is used to calculate dynamic viscosity?
A.
Bernoulli's equation
B.
Navier-Stokes equation
C.
Poiseuille's law
D.
Archimedes' principle
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Solution
Dynamic viscosity can be calculated using Poiseuille's law.
Correct Answer: C — Poiseuille's law
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Q. Which of the following equations represents the condition for the first minimum in single-slit diffraction?
A.
a sin(θ) = mλ
B.
a sin(θ) = (m + 0.5)λ
C.
a sin(θ) = (m + 1)λ
D.
a sin(θ) = 0
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Solution
The condition for the first minimum in single-slit diffraction is given by a sin(θ) = mλ, where m = 1 for the first minimum.
Correct Answer: A — a sin(θ) = mλ
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Q. Which of the following equations represents the condition for the first minimum in a single-slit diffraction pattern?
A.
a sin(θ) = λ
B.
a sin(θ) = 2λ
C.
a sin(θ) = 3λ
D.
a sin(θ) = 0
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Solution
The condition for the first minimum in a single-slit diffraction pattern is given by a sin(θ) = λ, where 'a' is the slit width and 'λ' is the wavelength.
Correct Answer: A — a sin(θ) = λ
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Q. Which of the following equations represents the relationship between shear stress and shear rate in a Newtonian fluid?
A.
τ = μ(du/dy)
B.
τ = ρg
C.
F = ma
D.
P = F/A
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Solution
In a Newtonian fluid, shear stress (τ) is directly proportional to the shear rate (du/dy) with the proportionality constant being the dynamic viscosity (μ).
Correct Answer: A — τ = μ(du/dy)
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Q. Which of the following factors does NOT affect surface tension?
A.
Temperature
B.
Impurities
C.
Density
D.
Nature of the liquid
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Solution
Density does not directly affect surface tension; it is influenced by temperature, impurities, and the nature of the liquid.
Correct Answer: C — Density
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Q. Which of the following factors does NOT affect the accuracy of a potentiometer?
A.
Temperature
B.
Length of the wire
C.
Material of the wire
D.
Color of the wire
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Solution
The color of the wire does not affect the accuracy of a potentiometer; however, temperature, length, and material do.
Correct Answer: D — Color of the wire
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Q. Which of the following factors does NOT affect the average kinetic energy of gas molecules?
A.
Temperature.
B.
Mass of the molecules.
C.
Number of molecules.
D.
Type of gas.
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Solution
The average kinetic energy of gas molecules is dependent only on the temperature of the gas, not on the mass or type of gas.
Correct Answer: B — Mass of the molecules.
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Q. Which of the following factors does NOT affect the buoyant force on an object submerged in a fluid?
A.
Density of the fluid
B.
Volume of the object
C.
Depth of the object
D.
Acceleration due to gravity
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Solution
The buoyant force depends on the density of the fluid, the volume of the object submerged, and the acceleration due to gravity, but not on the depth of the object.
Correct Answer: C — Depth of the object
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Q. Which of the following factors does NOT affect the buoyant force on an object?
A.
Volume of fluid displaced
B.
Density of the fluid
C.
Shape of the object
D.
Acceleration due to gravity
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Solution
The buoyant force depends on the volume of fluid displaced, the density of the fluid, and the acceleration due to gravity, but not on the shape of the object.
Correct Answer: C — Shape of the object
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Q. Which of the following factors does NOT affect the coefficient of friction between two surfaces?
A.
Surface roughness
B.
Material type
C.
Surface area
D.
Normal force
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Solution
The coefficient of friction is independent of the surface area in contact; it depends on the materials and their surface roughness.
Correct Answer: C — Surface area
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Q. Which of the following factors does NOT affect the coefficient of kinetic friction?
A.
Surface roughness
B.
Normal force
C.
Material of surfaces
D.
Speed of sliding
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Solution
The coefficient of kinetic friction is generally independent of the speed of sliding, while it depends on surface roughness, normal force, and material.
Correct Answer: D — Speed of sliding
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Q. Which of the following factors does NOT affect the density of a fluid?
A.
Temperature
B.
Pressure
C.
Volume
D.
Composition
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Solution
While temperature, pressure, and composition affect fluid density, volume does not directly affect density.
Correct Answer: C — Volume
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Q. Which of the following factors does NOT affect the gravitational force acting on a satellite?
A.
Mass of the satellite
B.
Mass of the Earth
C.
Distance from the center of the Earth
D.
Speed of the satellite
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Solution
The gravitational force depends on the masses of the objects and the distance between them, but not on the speed of the satellite.
Correct Answer: D — Speed of the satellite
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Q. Which of the following factors does NOT affect the gravitational force between a satellite and the Earth?
A.
Mass of the satellite
B.
Mass of the Earth
C.
Distance between the satellite and the Earth
D.
Speed of the satellite
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Solution
The gravitational force depends on the masses and the distance, but not on the speed of the satellite.
Correct Answer: D — Speed of the satellite
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Q. Which of the following factors does NOT affect the gravitational force on a satellite?
A.
Mass of the satellite
B.
Mass of the Earth
C.
Distance from the center of the Earth
D.
Speed of the satellite
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Solution
The gravitational force on a satellite depends on its mass, the mass of the Earth, and the distance from the center of the Earth, but not on the speed of the satellite.
Correct Answer: D — Speed of the satellite
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