Physics Syllabus (JEE Main)
Q. What is the primary cause of buoyancy in fluids?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is primarily caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of capillary action in liquids?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of surface tension in liquids?
A.
Cohesive forces
B.
Adhesive forces
C.
Gravitational forces
D.
Electromagnetic forces
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Solution
Surface tension is primarily caused by cohesive forces between liquid molecules, which create a 'skin' at the surface.
Correct Answer: A — Cohesive forces
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Q. What is the primary cause of the phenomenon known as capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of the phenomenon of buoyancy?
A.
Surface tension
B.
Pressure difference
C.
Viscosity
D.
Density
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Solution
Buoyancy is caused by the pressure difference between the top and bottom of an object submerged in a fluid.
Correct Answer: B — Pressure difference
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Q. What is the primary cause of the phenomenon of capillarity?
A.
Cohesion
B.
Adhesion
C.
Viscosity
D.
Density
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Solution
Capillarity is primarily caused by adhesion, which is the attraction between the liquid molecules and the surface of the solid.
Correct Answer: B — Adhesion
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Q. What is the primary cause of viscosity in fluids?
A.
Molecular interactions
B.
Temperature
C.
Pressure
D.
Density
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Solution
Viscosity arises primarily from molecular interactions within the fluid, which resist flow.
Correct Answer: A — Molecular interactions
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Q. What is the primary charge carrier in n-type semiconductors?
A.
Holes
B.
Electrons
C.
Protons
D.
Neutrons
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Solution
In n-type semiconductors, electrons are the majority charge carriers due to the addition of donor impurities.
Correct Answer: B — Electrons
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Q. What is the primary charge carrier in P-type semiconductors?
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
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Solution
In P-type semiconductors, holes are the primary charge carriers.
Correct Answer: B — Holes
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Q. What is the primary factor affecting the rate of heat transfer by conduction?
A.
Surface area
B.
Temperature difference
C.
Material properties
D.
All of the above
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Solution
All of the above factors affect the rate of heat transfer by conduction.
Correct Answer: D — All of the above
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Q. What is the primary factor that affects the viscosity of a gas?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular weight
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Solution
The viscosity of a gas is primarily affected by temperature; as temperature increases, viscosity also increases.
Correct Answer: A — Temperature
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Q. What is the primary factor that determines the viscosity of a fluid?
A.
Temperature
B.
Pressure
C.
Density
D.
Molecular size
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Solution
Viscosity is primarily affected by temperature; as temperature increases, viscosity generally decreases.
Correct Answer: A — Temperature
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Q. What is the primary force acting on a satellite in a stable orbit around the Earth?
A.
Gravitational force
B.
Electromagnetic force
C.
Frictional force
D.
Centrifugal force
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Solution
A satellite in a stable orbit is primarily influenced by the gravitational force exerted by the Earth.
Correct Answer: A — Gravitational force
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Q. What is the primary force that holds the nucleus of an atom together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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Q. What is the primary force that holds the nucleus together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds the protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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Q. What is the primary force that holds the protons and neutrons together in the nucleus?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus, overcoming the electromagnetic repulsion between protons.
Correct Answer: C — Strong nuclear force
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Q. What is the primary function of a diode in a circuit?
A.
Amplification
B.
Rectification
C.
Capacitance
D.
Inductance
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Solution
The primary function of a diode is rectification, allowing current to flow in one direction only.
Correct Answer: B — Rectification
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Q. What is the primary function of a modulator in a communication system?
A.
To amplify the signal
B.
To convert the signal into a suitable form for transmission
C.
To demodulate the received signal
D.
To filter out noise
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Solution
A modulator converts the baseband signal into a form suitable for transmission over a communication channel.
Correct Answer: B — To convert the signal into a suitable form for transmission
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Q. What is the primary function of a transistor in semiconductor technology?
A.
Switching
B.
Storage
C.
Transmission
D.
Resistance
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Solution
The primary function of a transistor is switching, allowing it to control electrical signals.
Correct Answer: A — Switching
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Q. What is the primary function of a transistor?
A.
Rectification
B.
Amplification
C.
Capacitance
D.
Inductance
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Solution
The primary function of a transistor is amplification of electrical signals.
Correct Answer: B — Amplification
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Q. What is the primary function of a transponder in satellite communication?
A.
To amplify the signal
B.
To receive and retransmit signals
C.
To modulate the signal
D.
To filter out noise
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Solution
A transponder in satellite communication receives signals from the ground, processes them, and retransmits them back to Earth.
Correct Answer: B — To receive and retransmit signals
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Q. What is the primary function of an antenna in a communication system?
A.
To amplify the signal
B.
To convert electrical signals into electromagnetic waves
C.
To modulate the signal
D.
To demodulate the signal
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Solution
An antenna converts electrical signals into electromagnetic waves for transmission and vice versa for reception.
Correct Answer: B — To convert electrical signals into electromagnetic waves
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Q. What is the primary mechanism of current flow in semiconductors?
A.
Electron flow only
B.
Hole flow only
C.
Both electron and hole flow
D.
Ionic flow
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Solution
Current flow in semiconductors occurs due to the movement of both electrons and holes.
Correct Answer: C — Both electron and hole flow
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Q. What is the primary mechanism of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
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Solution
In a vacuum, heat transfer occurs primarily through radiation, as there are no particles to conduct or convect heat.
Correct Answer: C — Radiation
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Q. What is the primary mechanism of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
In liquids and gases, convection is the primary mechanism of heat transfer, as it involves the movement of fluid.
Correct Answer: B — Convection
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Q. What is the primary mechanism of heat transfer in liquids?
A.
Conduction
B.
Convection
C.
Radiation
D.
All of the above
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Solution
In liquids, convection is the primary mechanism of heat transfer, although conduction and radiation can also occur.
Correct Answer: B — Convection
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Q. What is the primary method of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
The primary method of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer from the Sun to the Earth?
A.
Conduction
B.
Convection
C.
Radiation
D.
Conduction and Convection
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Solution
The primary mode of heat transfer from the Sun to the Earth is radiation, as it travels through the vacuum of space.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in a vacuum?
A.
Conduction
B.
Convection
C.
Radiation
D.
Insulation
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Solution
In a vacuum, there are no particles to conduct or convect heat, so radiation is the only mode of heat transfer.
Correct Answer: C — Radiation
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Q. What is the primary mode of heat transfer in liquids and gases?
A.
Conduction
B.
Convection
C.
Radiation
D.
None of the above
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Solution
Convection is the primary mode of heat transfer in liquids and gases due to the movement of the fluid.
Correct Answer: B — Convection
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