Q. Using Kirchhoff's voltage law, if a loop in a circuit has a 9V battery and two resistors (2Ω and 3Ω) with voltage drops of 4V and 5V respectively, is the loop correctly analyzed?
A.
Yes
B.
No
C.
Only if the battery is 12V
D.
Only if the resistors are in series
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Solution
According to Kirchhoff's voltage law, the sum of the voltage drops must equal the source voltage. Here, 4V + 5V = 9V, which is correct.
Correct Answer:
B
— No
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Q. What are the dimensions of pressure?
A.
ML^-1T^-2
B.
ML^2T^-2
C.
ML^2T^-1
D.
M^0L^0T^0
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Solution
Pressure is defined as force per unit area. The dimensions of force are ML^1T^-2, and area is L^2, thus pressure has dimensions ML^-1T^-2.
Correct Answer:
A
— ML^-1T^-2
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Q. What does Ampere's Law relate to in electromagnetism?
A.
Electric field and charge
B.
Magnetic field and current
C.
Electric potential and capacitance
D.
Magnetic flux and resistance
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Solution
Ampere's Law states that the magnetic field around a closed loop is proportional to the electric current passing through the loop.
Correct Answer:
B
— Magnetic field and current
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Q. What does Gauss's law relate to in electrostatics?
A.
Electric field and charge distribution
B.
Magnetic field and current
C.
Pressure and volume
D.
Temperature and heat
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Solution
Gauss's law states that the electric flux through a closed surface is proportional to the charge enclosed within that surface.
Correct Answer:
A
— Electric field and charge distribution
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Q. What does Ohm's Law state?
A.
Voltage is directly proportional to current
B.
Current is directly proportional to resistance
C.
Resistance is directly proportional to voltage
D.
Voltage is inversely proportional to current
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Solution
Ohm's Law states that the current through a conductor between two points is directly proportional to the voltage across the two points, which can be expressed as V = IR.
Correct Answer:
A
— Voltage is directly proportional to current
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Q. What does the Biot-Savart Law describe?
A.
The force between two charges
B.
The magnetic field generated by a steady current
C.
The electric field due to a point charge
D.
The potential energy of a system of charges
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Solution
The Biot-Savart Law describes the magnetic field generated by a steady current flowing through a conductor.
Correct Answer:
B
— The magnetic field generated by a steady current
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Q. What does the first law of thermodynamics state?
A.
Energy can be created and destroyed.
B.
The total energy of an isolated system is constant.
C.
Heat cannot be converted into work.
D.
The internal energy of a system is independent of its state.
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Solution
The first law of thermodynamics states that the total energy of an isolated system is constant, meaning energy can neither be created nor destroyed.
Correct Answer:
B
— The total energy of an isolated system is constant.
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Q. What does the term 'surface tension' refer to?
A.
Force per unit area
B.
Energy required to increase surface area
C.
Weight of a fluid
D.
Density of a liquid
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Solution
Surface tension is the energy required to increase the surface area of a liquid due to intermolecular forces.
Correct Answer:
B
— Energy required to increase surface area
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Q. What effect does adding salt to water have on its viscosity?
A.
Increases viscosity
B.
Decreases viscosity
C.
No effect
D.
Varies with concentration
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Solution
Adding salt to water generally increases its viscosity.
Correct Answer:
A
— Increases viscosity
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Q. What happens to the acceleration of an object if the net force acting on it is doubled while its mass remains constant?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to F = ma, if the force is doubled, the acceleration also doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the average kinetic energy of gas molecules if the temperature is increased?
A.
It decreases.
B.
It remains constant.
C.
It increases.
D.
It becomes zero.
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Solution
The average kinetic energy of gas molecules is directly proportional to the absolute temperature. Therefore, increasing the temperature increases the average kinetic energy.
Correct Answer:
C
— It increases.
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Q. What happens to the average speed of gas molecules if the temperature is increased?
A.
It decreases
B.
It remains constant
C.
It increases
D.
It becomes zero
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Solution
As the temperature of a gas increases, the average speed of gas molecules also increases due to the increase in kinetic energy.
Correct Answer:
C
— It increases
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Q. What happens to the balancing length if the emf of the cell is increased while keeping the potentiometer wire constant?
A.
Balancing length increases
B.
Balancing length decreases
C.
No change in balancing length
D.
Balancing length becomes zero
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Solution
Increasing the emf of the cell increases the balancing length, as it requires a longer length to balance the higher voltage.
Correct Answer:
A
— Balancing length increases
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Q. What happens to the capacitance of a capacitor if the dielectric constant is doubled?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
The capacitance C of a capacitor is directly proportional to the dielectric constant k. If k is doubled, C also doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is doubled?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
Capacitance C = ε₀A/d; if d is doubled, C is halved.
Correct Answer:
B
— It halves
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Q. What happens to the capacitance of a parallel plate capacitor if the distance between the plates is halved?
A.
It doubles
B.
It halves
C.
It quadruples
D.
It remains the same
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Solution
Capacitance, C = ε₀ * A / d. If d is halved, C doubles.
Correct Answer:
A
— It doubles
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Q. What happens to the conductivity of a semiconductor as temperature increases?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
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Solution
The conductivity of a semiconductor increases with temperature due to the increased thermal energy that frees more charge carriers.
Correct Answer:
A
— Increases
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Q. What happens to the current in a circuit if the resistance is increased while the voltage remains constant?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
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Solution
According to Ohm's Law, if resistance increases while voltage remains constant, the current decreases.
Correct Answer:
B
— It decreases
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Q. What happens to the current in a circuit if the voltage is tripled and the resistance remains constant?
A.
It triples
B.
It doubles
C.
It halves
D.
It remains the same
Show solution
Solution
According to Ohm's Law, if voltage (V) is tripled and resistance (R) remains constant, the current (I) will also triple: I = V / R.
Correct Answer:
A
— It triples
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Q. What happens to the current in the galvanometer when the Wheatstone bridge is balanced?
A.
Increases
B.
Decreases
C.
Becomes zero
D.
Fluctuates
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Solution
When the Wheatstone bridge is balanced, the current in the galvanometer becomes zero.
Correct Answer:
C
— Becomes zero
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Q. What happens to the current through the galvanometer when the bridge is balanced?
A.
It increases.
B.
It decreases.
C.
It becomes zero.
D.
It becomes maximum.
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Solution
When the bridge is balanced, the current through the galvanometer becomes zero.
Correct Answer:
C
— It becomes zero.
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is unbalanced?
A.
It becomes zero
B.
It increases
C.
It decreases
D.
It becomes infinite
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Solution
When the Wheatstone bridge is unbalanced, there is a non-zero potential difference across the galvanometer, causing current to flow through it.
Correct Answer:
B
— It increases
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is balanced?
A.
It increases
B.
It decreases
C.
It becomes zero
D.
It becomes infinite
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Solution
When the Wheatstone bridge is balanced, the potential difference across the galvanometer is zero, resulting in zero current through it.
Correct Answer:
C
— It becomes zero
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Q. What happens to the current through the galvanometer when the Wheatstone bridge is perfectly balanced?
A.
It flows in one direction.
B.
It flows in both directions.
C.
It is zero.
D.
It is maximum.
Show solution
Solution
When the Wheatstone bridge is perfectly balanced, the current through the galvanometer is zero.
Correct Answer:
C
— It is zero.
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Q. What happens to the density of a gas when it is compressed at constant temperature?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Becomes zero
Show solution
Solution
According to the ideal gas law, compressing a gas at constant temperature increases its density.
Correct Answer:
A
— Increases
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Q. What happens to the diffraction pattern when monochromatic light is replaced with white light?
A.
It becomes monochromatic
B.
It disappears
C.
It becomes colored
D.
It remains unchanged
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Solution
Replacing monochromatic light with white light results in a colored diffraction pattern due to the different wavelengths.
Correct Answer:
C
— It becomes colored
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Q. What happens to the diffraction pattern when the distance between the slits in a double-slit experiment is increased?
A.
Fringe width increases
B.
Fringe width decreases
C.
Fringe pattern disappears
D.
Fringe intensity increases
Show solution
Solution
Increasing the distance between the slits decreases the fringe width, as fringe width is inversely proportional to the slit separation.
Correct Answer:
B
— Fringe width decreases
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Q. What happens to the diffraction pattern when the distance to the screen is increased?
A.
Fringe width decreases
B.
Fringe width increases
C.
Fringe intensity increases
D.
Fringe intensity decreases
Show solution
Solution
Increasing the distance to the screen results in an increase in fringe width in the diffraction pattern.
Correct Answer:
B
— Fringe width increases
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Q. What happens to the diffraction pattern when the slit width is decreased?
A.
Pattern becomes wider
B.
Pattern becomes narrower
C.
No change in pattern
D.
Pattern disappears
Show solution
Solution
Decreasing the slit width increases the diffraction angle, causing the diffraction pattern to become wider.
Correct Answer:
A
— Pattern becomes wider
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Q. What happens to the electric field if the charge is tripled while keeping the distance constant?
A.
It triples
B.
It halves
C.
It remains the same
D.
It quadruples
Show solution
Solution
The electric field is directly proportional to the charge. Tripling the charge will triple the electric field.
Correct Answer:
A
— It triples
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Physics Syllabus (JEE Main) MCQ & Objective Questions
The Physics Syllabus for JEE Main is crucial for students aiming to excel in their exams. Understanding this syllabus not only helps in grasping fundamental concepts but also enhances problem-solving skills through practice. Engaging with MCQs and objective questions is essential for effective exam preparation, as it allows students to identify important questions and strengthen their knowledge base.
What You Will Practise Here
Mechanics: Laws of Motion, Work, Energy, and Power
Thermodynamics: Laws of Thermodynamics, Heat Transfer
Waves and Oscillations: Simple Harmonic Motion, Wave Properties
Electromagnetism: Electric Fields, Magnetic Fields, and Circuits
Optics: Reflection, Refraction, and Optical Instruments
Modern Physics: Quantum Theory, Atomic Models, and Nuclear Physics
Fluid Mechanics: Properties of Fluids, Bernoulli's Principle
Exam Relevance
The Physics Syllabus (JEE Main) is integral to various examinations, including CBSE, State Boards, and competitive exams like NEET and JEE. Questions often focus on conceptual understanding and application of theories. Common patterns include numerical problems, conceptual MCQs, and assertion-reason type questions, which test both knowledge and analytical skills.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers.
Neglecting units and dimensions in calculations.
Overlooking the significance of diagrams in understanding concepts.
Confusing similar concepts, such as velocity and acceleration.
Failing to apply formulas correctly in different contexts.
FAQs
Question: What are the key topics in the Physics Syllabus for JEE Main?Answer: Key topics include Mechanics, Thermodynamics, Waves, Electromagnetism, Optics, Modern Physics, and Fluid Mechanics.
Question: How can I improve my performance in Physics MCQs?Answer: Regular practice of MCQs, understanding concepts deeply, and revising important formulas can significantly enhance your performance.
Start solving practice MCQs today to test your understanding of the Physics Syllabus (JEE Main). This will not only boost your confidence but also prepare you effectively for your upcoming exams. Remember, consistent practice is the key to success!
