JEE Main MCQ & Objective Questions
The JEE Main exam is a crucial step for students aspiring to enter prestigious engineering colleges in India. It tests not only knowledge but also the ability to apply concepts effectively. Practicing MCQs and objective questions is essential for scoring better, as it helps in familiarizing students with the exam pattern and enhances their problem-solving skills. Engaging with practice questions allows students to identify important questions and strengthen their exam preparation.
What You Will Practise Here
Fundamental concepts of Physics, Chemistry, and Mathematics
Key formulas and their applications in problem-solving
Important definitions and theories relevant to JEE Main
Diagrams and graphical representations for better understanding
Numerical problems and their step-by-step solutions
Previous years' JEE Main questions for real exam experience
Time management strategies while solving MCQs
Exam Relevance
The topics covered in JEE Main are not only significant for the JEE exam but also appear in various CBSE and State Board examinations. Many concepts are shared with the NEET syllabus, making them relevant across multiple competitive exams. Common question patterns include conceptual applications, numerical problems, and theoretical questions that assess a student's understanding of core subjects.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers
Neglecting units in numerical problems, which can change the outcome
Overlooking negative marking and not managing time effectively
Relying too heavily on rote memorization instead of understanding concepts
Failing to review and analyze mistakes from practice tests
FAQs
Question: How can I improve my speed in solving JEE Main MCQ questions?Answer: Regular practice with timed quizzes and focusing on shortcuts can significantly enhance your speed.
Question: Are the JEE Main objective questions similar to previous years' papers?Answer: Yes, many questions are based on previous years' patterns, so practicing them can be beneficial.
Question: What is the best way to approach JEE Main practice questions?Answer: Start with understanding the concepts, then attempt practice questions, and finally review your answers to learn from mistakes.
Now is the time to take charge of your preparation! Dive into solving JEE Main MCQs and practice questions to test your understanding and boost your confidence for the exam.
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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Q. In a Wheatstone bridge, if the resistance R2 is doubled, what effect does it have on the balance condition?
A.
It remains balanced.
B.
It becomes unbalanced.
C.
It requires R4 to be halved.
D.
It requires R1 to be doubled.
Show solution
Solution
Doubling R2 will change the ratio R1/R2, thus unbalancing the bridge.
Correct Answer:
B
— It becomes unbalanced.
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Q. In a Wheatstone bridge, if the resistance R4 is adjusted to achieve balance, what does this imply about the other resistances?
A.
They are equal.
B.
They are in series.
C.
They are in parallel.
D.
They maintain a specific ratio.
Show solution
Solution
Adjusting R4 to achieve balance implies that the other resistances maintain a specific ratio.
Correct Answer:
D
— They maintain a specific ratio.
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Q. In a Wheatstone bridge, if the resistances are 1Ω, 2Ω, 3Ω, and 6Ω, is the bridge balanced?
A.
Yes
B.
No
C.
Only if R4 is adjusted
D.
Only if R3 is adjusted
Show solution
Solution
The bridge is not balanced because 1/2 is not equal to 3/6.
Correct Answer:
B
— No
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Q. In a Wheatstone bridge, if the resistances are P = 5Ω, Q = 10Ω, R = 15Ω, what is the value of S for balance?
A.
7.5Ω
B.
10Ω
C.
12.5Ω
D.
15Ω
Show solution
Solution
Using the balance condition P/Q = R/S, we find S = (Q*R)/P = (10*15)/5 = 30Ω.
Correct Answer:
C
— 12.5Ω
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Q. In a Wheatstone bridge, if the resistances are R1 = 2Ω, R2 = 3Ω, R3 = 4Ω, what is the value of R4 for balance?
A.
6Ω
B.
8Ω
C.
12Ω
D.
1.5Ω
Show solution
Solution
For balance, R4 must be 6Ω since 2/3 = 4/6.
Correct Answer:
A
— 6Ω
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Q. In a Wheatstone bridge, if the supply voltage is 12V and the bridge is balanced, what is the voltage across each arm?
A.
6V each
B.
12V each
C.
4V each
D.
8V each
Show solution
Solution
In a balanced Wheatstone bridge, the voltage divides equally across the two arms, so each arm would have 6V if the total is 12V.
Correct Answer:
A
— 6V each
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Q. In a zero-order reaction, how does the rate change with respect to concentration?
A.
Increases linearly
B.
Decreases linearly
C.
Remains constant
D.
Increases exponentially
Show solution
Solution
In a zero-order reaction, the rate is constant and does not depend on the concentration of reactants.
Correct Answer:
C
— Remains constant
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Q. In a zero-order reaction, if the rate constant k is 5 mol/L/s, how long will it take for the concentration to decrease from 2 mol/L to 0 mol/L?
A.
0.4 s
B.
0.5 s
C.
0.6 s
D.
0.8 s
Show solution
Solution
For a zero-order reaction, time = (initial concentration - final concentration) / k = (2 - 0) / 5 = 0.4 s.
Correct Answer:
C
— 0.6 s
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Q. In a zero-order reaction, the rate of reaction is independent of which of the following?
A.
Concentration of reactants
B.
Temperature
C.
Catalyst
D.
All of the above
Show solution
Solution
In a zero-order reaction, the rate of reaction is independent of the concentration of reactants.
Correct Answer:
A
— Concentration of reactants
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Q. In amplitude modulation (AM), what does the amplitude of the carrier wave represent?
A.
The frequency of the modulating signal
B.
The phase of the modulating signal
C.
The information signal
D.
The power of the carrier wave
Show solution
Solution
In AM, the amplitude of the carrier wave varies in accordance with the amplitude of the modulating signal, which carries the information.
Correct Answer:
C
— The information signal
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Q. In amplitude modulation (AM), what does the carrier wave represent?
A.
The information signal
B.
The frequency of the modulated signal
C.
The average power of the signal
D.
The high-frequency signal that carries the information
Show solution
Solution
In AM, the carrier wave is a high-frequency signal that carries the information signal by varying its amplitude.
Correct Answer:
D
— The high-frequency signal that carries the information
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Q. In an AC circuit, if the capacitive reactance is greater than the inductive reactance, the circuit is said to be:
A.
Resistive
B.
Inductive
C.
Capacitive
D.
Neutral
Show solution
Solution
If capacitive reactance (X_C) is greater than inductive reactance (X_L), the circuit is capacitive.
Correct Answer:
C
— Capacitive
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Q. In an AC circuit, if the current lags the voltage by 30 degrees, what is the type of load?
A.
Resistive
B.
Inductive
C.
Capacitive
D.
None of the above
Show solution
Solution
If the current lags the voltage, it indicates an inductive load, as inductors cause the current to lag behind the voltage.
Correct Answer:
B
— Inductive
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Q. In an AC circuit, if the current lags the voltage by 30 degrees, what type of circuit is it?
A.
Resistive
B.
Inductive
C.
Capacitive
D.
None of the above
Show solution
Solution
If the current lags the voltage, it indicates an inductive circuit, where the current phase is behind the voltage phase.
Correct Answer:
B
— Inductive
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Q. In an AC circuit, if the current lags the voltage by 30 degrees, what type of load is present?
A.
Resistive
B.
Inductive
C.
Capacitive
D.
None of the above
Show solution
Solution
If the current lags the voltage, it indicates the presence of an inductive load, as inductors cause the current to lag behind the voltage.
Correct Answer:
B
— Inductive
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Q. In an AC circuit, if the current lags the voltage by 45 degrees, what is the type of load?
A.
Resistive
B.
Inductive
C.
Capacitive
D.
None of the above
Show solution
Solution
If the current lags the voltage, it indicates an inductive load, as inductors cause the current to lag behind the voltage.
Correct Answer:
B
— Inductive
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