Q. In a Wheatstone bridge, if R1 = 20Ω, R2 = 30Ω, and R3 = 10Ω, what is the value of R4 for balance?
A.
15Ω
B.
20Ω
C.
25Ω
D.
30Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (30 * 10) / 20 = 15Ω.
Correct Answer:
B
— 20Ω
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Q. In a Wheatstone bridge, if R1 = 20Ω, R2 = 30Ω, and R3 = 10Ω, what is the value of R4 for the bridge to be balanced?
A.
15Ω
B.
20Ω
C.
25Ω
D.
30Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (30 * 10) / 20 = 15Ω.
Correct Answer:
B
— 20Ω
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Q. In a Wheatstone bridge, if R1 = 2Ω, R2 = 3Ω, and R3 = 6Ω, what is the value of R4 for balance?
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (3 * 6) / 2 = 9Ω.
Correct Answer:
C
— 6Ω
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Q. In a Wheatstone bridge, if R1 = 2Ω, R2 = 3Ω, and R3 = 6Ω, what is the value of R4 for the bridge to be balanced?
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (3 * 6) / 2 = 9Ω.
Correct Answer:
C
— 12Ω
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Q. In a Wheatstone bridge, if R1 = 3Ω, R2 = 6Ω, and R3 = 9Ω, what is the value of R4 for balance?
A.
4.5Ω
B.
6Ω
C.
9Ω
D.
12Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = 6Ω.
Correct Answer:
B
— 6Ω
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Q. In a Wheatstone bridge, if R1 = 4Ω, R2 = 6Ω, and R3 = 12Ω, what is the value of R4 for the bridge to be balanced?
A.
8Ω
B.
9Ω
C.
10Ω
D.
12Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (6 * 12) / 4 = 18Ω.
Correct Answer:
D
— 12Ω
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Q. In a Wheatstone bridge, if R1 = 5Ω, R2 = 10Ω, and R3 = 15Ω, what is the value of R4 for balance?
A.
7.5Ω
B.
10Ω
C.
12.5Ω
D.
20Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (10 * 15) / 5 = 30Ω.
Correct Answer:
C
— 12.5Ω
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Q. In a Wheatstone bridge, if R1 = 5Ω, R2 = 10Ω, and R3 = 15Ω, what is the value of R4 for the bridge to be balanced?
A.
7.5Ω
B.
10Ω
C.
12.5Ω
D.
15Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we have 5/10 = 15/x, solving gives x = 7.5Ω.
Correct Answer:
C
— 12.5Ω
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Q. In a Wheatstone bridge, if the battery voltage is 12V and the bridge is balanced, what is the current through the galvanometer?
Show solution
Solution
In a balanced Wheatstone bridge, the current through the galvanometer is zero.
Correct Answer:
A
— 0A
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Q. In a Wheatstone bridge, if the battery voltage is 12V and the bridge is balanced, what is the voltage across each resistor?
Show solution
Solution
In a balanced Wheatstone bridge, the voltage is divided equally across the resistors, so each resistor will have 6V.
Correct Answer:
C
— 6V
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Q. In a Wheatstone bridge, if the battery voltage is 12V and the resistances are equal, what is the voltage across the galvanometer?
Show solution
Solution
With equal resistances, the voltage across the galvanometer is 0V.
Correct Answer:
A
— 0V
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Q. In a Wheatstone bridge, if the battery voltage is increased, what happens to the balance condition?
A.
It changes
B.
It remains the same
C.
It becomes unstable
D.
It cannot be determined
Show solution
Solution
The balance condition depends on the ratio of resistances, not the voltage.
Correct Answer:
B
— It remains the same
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Q. In a Wheatstone bridge, if the bridge is balanced, what can be said about the ratio of the resistances?
A.
R1/R2 = R3/R4
B.
R1 + R2 = R3 + R4
C.
R1 - R2 = R3 - R4
D.
R1 * R2 = R3 * R4
Show solution
Solution
In a balanced Wheatstone bridge, the ratio of the resistances in one branch is equal to the ratio in the other branch, hence R1/R2 = R3/R4.
Correct Answer:
A
— R1/R2 = R3/R4
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Q. In a Wheatstone bridge, if the bridge is unbalanced, what happens to the current through the galvanometer?
A.
It becomes zero
B.
It increases
C.
It decreases
D.
It oscillates
Show solution
Solution
When the Wheatstone bridge is unbalanced, a current flows through the galvanometer, indicating a difference in potential across it.
Correct Answer:
B
— It increases
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Q. In a Wheatstone bridge, if the galvanometer shows a current, what can be inferred?
A.
The bridge is balanced
B.
The bridge is unbalanced
C.
The resistances are equal
D.
The circuit is open
Show solution
Solution
A current in the galvanometer indicates that the bridge is unbalanced.
Correct Answer:
B
— The bridge is unbalanced
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Q. In a Wheatstone bridge, if the galvanometer shows a current, what does it indicate?
A.
The bridge is balanced
B.
The bridge is unbalanced
C.
The resistances are equal
D.
The circuit is open
Show solution
Solution
A current in the galvanometer indicates that the bridge is unbalanced.
Correct Answer:
B
— The bridge is unbalanced
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Q. In a Wheatstone bridge, if the galvanometer shows a current, which of the following statements is true?
A.
The bridge is balanced.
B.
The bridge is unbalanced.
C.
The resistances are equal.
D.
The potential difference is zero.
Show solution
Solution
If the galvanometer shows a current, it indicates that the bridge is unbalanced.
Correct Answer:
B
— The bridge is unbalanced.
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Q. In a Wheatstone bridge, if the galvanometer shows a deflection, what does it indicate?
A.
The bridge is balanced
B.
The bridge is unbalanced
C.
The resistances are equal
D.
The current is zero
Show solution
Solution
A deflection in the galvanometer indicates that the bridge is unbalanced, meaning the ratios of the resistances are not equal.
Correct Answer:
B
— The bridge is unbalanced
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Q. In a Wheatstone bridge, if the galvanometer shows zero deflection, what can be inferred about the current?
A.
No current flows
B.
Current flows through the galvanometer
C.
Current is maximum
D.
Current is minimum
Show solution
Solution
Zero deflection indicates that no current flows through the galvanometer.
Correct Answer:
A
— No current flows
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Q. In a Wheatstone bridge, if the galvanometer shows zero deflection, what does it indicate?
A.
The bridge is balanced
B.
The bridge is unbalanced
C.
The current is zero
D.
The resistances are equal
Show solution
Solution
Zero deflection in the galvanometer indicates that the bridge is balanced.
Correct Answer:
A
— The bridge is balanced
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Q. In a Wheatstone bridge, if the known resistances are 5Ω and 10Ω, what is the unknown resistance if the bridge is balanced with a 15Ω resistor?
A.
7.5Ω
B.
10Ω
C.
12.5Ω
D.
15Ω
Show solution
Solution
Using the balance condition R1/R2 = R3/R4, we find R4 = (R2 * R3) / R1 = (10 * 15) / 5 = 30Ω.
Correct Answer:
C
— 12.5Ω
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Q. In a Wheatstone bridge, if the ratio of resistances in one arm is 2:3 and in the other arm is 4:5, what can be said about the bridge?
A.
Balanced
B.
Unbalanced
C.
Cannot be determined
D.
Short-circuited
Show solution
Solution
The bridge is unbalanced because the ratios 2:3 and 4:5 are not equal.
Correct Answer:
B
— Unbalanced
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Q. In a Wheatstone bridge, if the ratio of resistances in one arm is 2:3 and in the other arm is 4:5, what is the condition for the bridge to be balanced?
A.
2/3 = 4/5
B.
2/3 = 5/4
C.
3/2 = 5/4
D.
3/2 = 4/5
Show solution
Solution
For the bridge to be balanced, the ratios must be equal. Thus, 2/3 should equal 4/5, which is not true.
Correct Answer:
A
— 2/3 = 4/5
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Q. In a Wheatstone bridge, if the ratio of resistances P and Q is 2:3 and the ratio of resistances R and S is 4:5, what can be said about the bridge?
A.
Balanced
B.
Unbalanced
C.
Cannot be determined
D.
Short-circuited
Show solution
Solution
The bridge is unbalanced because the ratios of the resistances do not match.
Correct Answer:
B
— Unbalanced
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Q. In a Wheatstone bridge, if the ratio of resistances R1 and R2 is equal to the ratio of R3 and R4, what can be said about the bridge?
A.
The bridge is balanced.
B.
The bridge is unbalanced.
C.
The current through the galvanometer is maximum.
D.
The potential difference across the galvanometer is maximum.
Show solution
Solution
When R1/R2 = R3/R4, the bridge is balanced, meaning no current flows through the galvanometer.
Correct Answer:
A
— The bridge is balanced.
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Q. In a Wheatstone bridge, if the ratio of resistances R1 to R2 is equal to the ratio of R3 to R4, what can be said about the bridge?
A.
The bridge is balanced.
B.
The bridge is unbalanced.
C.
The current through the galvanometer is maximum.
D.
The potential difference across the galvanometer is maximum.
Show solution
Solution
When R1/R2 = R3/R4, the bridge is balanced, meaning no current flows through the galvanometer.
Correct Answer:
A
— The bridge is balanced.
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Q. In a Wheatstone bridge, if the ratio of resistances R1 to R2 is equal to the ratio of R3 to R4, what can be concluded?
A.
The bridge is balanced.
B.
The current through the galvanometer is maximum.
C.
The potential difference across the galvanometer is maximum.
D.
The resistances are equal.
Show solution
Solution
When R1/R2 = R3/R4, the bridge is balanced, meaning no current flows through the galvanometer.
Correct Answer:
A
— The bridge is balanced.
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Q. In a Wheatstone bridge, if the ratio of the resistances in one arm is 2:3 and in the other arm is 4:5, what is the condition for the bridge to be balanced?
A.
2/3 = 4/5
B.
2/3 = 5/4
C.
3/2 = 5/4
D.
3/2 = 4/5
Show solution
Solution
For a Wheatstone bridge to be balanced, the ratio of the resistances must be equal. Here, 2/3 is not equal to 4/5.
Correct Answer:
A
— 2/3 = 4/5
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Q. In a Wheatstone bridge, if the resistance P is increased, what effect does it have on the balance condition?
A.
Bridge remains balanced
B.
Bridge becomes unbalanced
C.
Bridge becomes short-circuited
D.
Bridge becomes open-circuited
Show solution
Solution
Increasing resistance P will disturb the balance condition, making the bridge unbalanced.
Correct Answer:
B
— Bridge becomes unbalanced
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Q. In a Wheatstone bridge, if the resistance R2 is decreased, what effect does it have on the balance condition?
A.
It will balance the bridge.
B.
It will unbalance the bridge.
C.
It has no effect.
D.
It will increase the current.
Show solution
Solution
Decreasing R2 will disturb the balance condition, causing the bridge to become unbalanced.
Correct Answer:
B
— It will unbalance the bridge.
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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!
