Physics Syllabus (JEE Main)
Q. In which of the following scenarios is light most likely to be polarized?
A.
When it passes through a prism
B.
When it reflects off a smooth surface
C.
When it travels through a vacuum
D.
When it diffracts through a narrow slit
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Solution
Light is most likely to be polarized when it reflects off a smooth surface, such as water or glass.
Correct Answer: B — When it reflects off a smooth surface
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Q. In which of the following scenarios is light polarized?
A.
Light from a candle
B.
Light from a laser
C.
Light from an incandescent bulb
D.
Light from a fluorescent lamp
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Solution
Light from a laser is typically polarized, while the other sources emit unpolarized light.
Correct Answer: B — Light from a laser
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Q. In which of the following scenarios is the magnetic force on a charged particle zero?
A.
When the particle is at rest
B.
When the particle moves parallel to the magnetic field
C.
When the particle moves perpendicular to the magnetic field
D.
Both 1 and 2
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Solution
The magnetic force on a charged particle is zero when it is at rest or when it moves parallel to the magnetic field.
Correct Answer: D — Both 1 and 2
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Q. In which of the following scenarios will a charged particle experience no magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both A and C
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Solution
A charged particle experiences no magnetic force when it is either at rest or moving parallel to the magnetic field.
Correct Answer: D — Both A and C
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Q. In which of the following scenarios will a charged particle experience the maximum magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
When moving at an angle of 45 degrees
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Solution
A charged particle experiences maximum magnetic force when moving perpendicular to the magnetic field, as sin(90°) = 1.
Correct Answer: B — When moving perpendicular to the magnetic field
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Q. In which of the following scenarios will a charged particle not experience any magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both a and c
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Solution
A charged particle will not experience any magnetic force when it is at rest or moving parallel to the magnetic field.
Correct Answer: D — Both a and c
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Q. In which of the following scenarios will a magnetic field be produced?
A.
A stationary charge
B.
A moving charge
C.
A neutral atom
D.
A charged particle at rest
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Solution
A magnetic field is produced by a moving charge. A stationary charge does not produce a magnetic field.
Correct Answer: B — A moving charge
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Q. In which of the following scenarios will total internal reflection NOT occur?
A.
Light traveling from diamond to air
B.
Light traveling from water to air
C.
Light traveling from air to glass
D.
Light traveling from glass to air
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Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer: C — Light traveling from air to glass
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Q. In which of the following scenarios will total internal reflection occur?
A.
Light from air to water
B.
Light from glass to air
C.
Light from water to glass
D.
Light from air to glass
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Solution
Total internal reflection occurs when light travels from a denser medium (glass) to a less dense medium (air) at an angle greater than the critical angle.
Correct Answer: B — Light from glass to air
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Q. In which of the following scenarios would total internal reflection NOT occur?
A.
Light traveling from diamond to air.
B.
Light traveling from water to air.
C.
Light traveling from air to glass.
D.
Light traveling from glass to water.
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Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer: C — Light traveling from air to glass.
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Q. In which of the following scenarios would you expect a fluid to have lower viscosity?
A.
At lower temperatures
B.
At higher temperatures
C.
Under high pressure
D.
In a narrow pipe
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Solution
Fluids generally have lower viscosity at higher temperatures.
Correct Answer: B — At higher temperatures
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Q. In which of the following scenarios would you expect a fluid to have the lowest viscosity?
A.
High temperature
B.
Low temperature
C.
High pressure
D.
Low pressure
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Solution
A fluid typically has the lowest viscosity at high temperatures.
Correct Answer: A — High temperature
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Q. In which of the following scenarios would you expect to observe a decrease in viscosity?
A.
Cooling a liquid
B.
Heating a liquid
C.
Increasing pressure
D.
Adding a solute
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Solution
Heating a liquid generally decreases its viscosity, allowing it to flow more freely.
Correct Answer: B — Heating a liquid
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Q. In which of the following scenarios would you expect to see the effects of viscosity most prominently?
A.
A river flowing rapidly
B.
Oil pouring from a bottle
C.
Air moving around a plane
D.
Water boiling
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Solution
The effects of viscosity are most prominently observed when oil pours from a bottle, as it flows slowly due to its higher viscosity.
Correct Answer: B — Oil pouring from a bottle
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Q. In which process does a gas do work on its surroundings?
A.
Isothermal expansion
B.
Adiabatic compression
C.
Isochoric process
D.
Isobaric process
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Solution
In isothermal expansion, a gas does work on its surroundings as it expands.
Correct Answer: A — Isothermal expansion
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Q. In which process does heat transfer occur due to the movement of fluid?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
Convection is the process of heat transfer that occurs due to the movement of fluid, where warmer areas of a liquid or gas rise and cooler areas sink.
Correct Answer: B — Convection
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Q. In which process does heat transfer occur without any physical movement of the material?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
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Solution
Conduction is the process where heat is transferred through a material without any movement of the material itself.
Correct Answer: A — Conduction
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Q. In which scenario does heat transfer occur through both conduction and convection?
A.
A hot cup of coffee cooling down
B.
A metal rod heated at one end
C.
A warm room losing heat to the outside
D.
A block of ice melting
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Solution
A hot cup of coffee cooling down involves conduction (heat transfer from coffee to cup) and convection (heat transfer from cup to air).
Correct Answer: A — A hot cup of coffee cooling down
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Q. In which scenario is light most likely to be polarized?
A.
When it passes through a prism
B.
When it reflects off a lake
C.
When it travels through air
D.
When it passes through a lens
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Solution
Light is most likely to be polarized when it reflects off a surface, such as a lake.
Correct Answer: B — When it reflects off a lake
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Q. In which scenario would the frictional force be at its maximum?
A.
When an object is at rest
B.
When an object is sliding
C.
When an object is rolling
D.
When an object is in free fall
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Solution
The maximum frictional force occurs when an object is at rest, just before it starts to slide, which is characterized by static friction.
Correct Answer: A — When an object is at rest
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Q. In which scenario would the frictional force be zero?
A.
A block sliding down a frictionless ramp.
B.
A block at rest on a flat surface.
C.
A block moving on a rough surface.
D.
A block in free fall.
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Solution
Frictional force is zero when there is no contact force opposing the motion, such as a block sliding down a frictionless ramp.
Correct Answer: A — A block sliding down a frictionless ramp.
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Q. In which scenario would total internal reflection NOT occur?
A.
Light traveling from glass to air at a steep angle.
B.
Light traveling from water to air at a shallow angle.
C.
Light traveling from diamond to air at a high angle.
D.
Light traveling from air to water at any angle.
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Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (water) at any angle, as it will always refract.
Correct Answer: D — Light traveling from air to water at any angle.
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Q. In Young's double-slit experiment, if the distance between the slits is 0.2 mm and the distance from the slits to the screen is 1 m, what is the distance between the first and second bright fringes?
A.
0.1 mm
B.
0.2 mm
C.
0.4 mm
D.
0.6 mm
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Solution
Distance between fringes (y) = (λD)/d. Assuming λ = 500 nm, y = (500 x 10^-9 * 1)/(0.2 x 10^-3) = 0.0025 m = 0.25 mm. Distance between first and second bright fringes = 0.4 mm.
Correct Answer: C — 0.4 mm
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Q. In Young's double-slit experiment, if the distance between the slits is 0.2 mm and the distance to the screen is 1 m, what is the fringe width if the wavelength of light used is 500 nm?
A.
0.1 mm
B.
0.2 mm
C.
0.5 mm
D.
0.8 mm
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Solution
Fringe width (β) = λD/d. Here, D = 1 m, d = 0.2 mm = 0.0002 m, λ = 500 nm = 500 x 10^-9 m. β = (500 x 10^-9 * 1) / 0.0002 = 0.0025 m = 0.25 mm.
Correct Answer: A — 0.1 mm
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Q. In Young's double-slit experiment, if the distance between the slits is doubled while keeping the wavelength constant, what happens to the fringe width?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Fringe width (β) is given by β = λD/d, where D is the distance to the screen and d is the distance between the slits. If d is doubled, β halves.
Correct Answer: B — It halves
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Q. In Young's double-slit experiment, if the distance between the slits is doubled, what happens to the fringe width?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Fringe width is given by β = λD/d. If d (distance between slits) is doubled, the fringe width β will halve.
Correct Answer: B — It halves
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Q. Lenz's law states that the direction of induced current is such that it opposes what?
A.
The change in magnetic flux
B.
The flow of electric current
C.
The resistance in the circuit
D.
The applied voltage
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Solution
Lenz's law states that the direction of induced current will oppose the change in magnetic flux that produced it.
Correct Answer: A — The change in magnetic flux
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Q. The average kinetic energy of gas molecules is proportional to which of the following?
A.
Pressure
B.
Volume
C.
Temperature
D.
Density
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Solution
The average kinetic energy of gas molecules is directly proportional to the absolute temperature of the gas.
Correct Answer: C — Temperature
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Q. The concept of an ideal gas is based on which of the following assumptions?
A.
Molecules have no volume
B.
Molecules do not attract or repel each other
C.
Collisions are perfectly elastic
D.
All of the above
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Solution
The concept of an ideal gas is based on the assumptions that molecules have no volume, do not attract or repel each other, and that collisions are perfectly elastic.
Correct Answer: D — All of the above
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Q. The concept of mean free path is associated with which of the following?
A.
Distance traveled by a gas molecule between collisions
B.
Average speed of gas molecules
C.
Pressure of the gas
D.
Volume of the gas
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Solution
Mean free path is defined as the average distance traveled by a gas molecule between successive collisions.
Correct Answer: A — Distance traveled by a gas molecule between collisions
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