All India JEE Group

PhonePe में गलत ट्रांजेक्शन से पैसे कैसे वापस पाएं?

Gdgdg Hdfhh answered  •  1 hour ago
किसी गलत लेनदेन के लिए फोन पे से पैसे वापस पाने के लिए, आपको तुरंत फोन पे के ग्राहक सहायता से संपर्क करना चाहिए: +91917-8427-621 -और (24/7 उपलब्ध) समस्या की रिपोर्ट करें ।.किसी गलत लेनदेन के लिए फोन पे से पैसे वापस पाने के लिए, आपको तुरंत फोन पे के ग्राहक सहायता से संपर्क करना चाहिए: +91917-8427-621 -और (24/7 उपलब्ध) समस्या की रिपोर्ट करें ।.

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Chirag Chakraborty answered  •  8 hours ago
Overview of JEE 2025 Session 1 Memory-Based Question Paper
Preparing for JEE 2025 requires a strategic approach, particularly with memory-based question papers from previous sessions. These papers are invaluable for understanding question patterns and frequently tested concepts.
Importance of Memory-Based Papers
- Provides insight into question types and difficulty lev
... more

Dehydration of cyclopentyl carbocation with conc. H2SO4 forms
  • a)
    Cyclopentene
  • b)
    Cyclohexene
  • c)
    Cyclohexane
  • d)
    None of these
Correct answer is option 'B'. Can you explain this answer?

Subham Goyal answered  •  8 hours ago
Understanding the Reaction
When cyclopentyl carbocation undergoes dehydration in the presence of concentrated sulfuric acid (H2SO4), a rearrangement and elimination reaction occurs.
Formation of Cyclopentyl Carbocation
- Cyclopentyl carbocation is formed when cyclopentanol loses a water molecule.
- This carbocation is stable enough to rearrange or eliminate a pro
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If the mean of numbers 27,31,89,107,156 is 82, then the mean of 130,126,68,50,1 is :
  • a)
    75
  • b)
    82
  • c)
    80
  • d)
    157
Correct answer is option 'A'. Can you explain this answer?

Pratyush Rajwansh answered  •  14 hours ago
It is because the mean is the same as of average sum of the total number is divided by the total number of numbers present. (130+126+68+50+1)/5 =75

The coordination number and geometry of the complex ion [Ni(CN)4]2− are:
  • a)
    6 and Octahedral
  • b)
    4 and Tetrahedral
  • c)
    4 and Square Planar
  • d)
    6 and Tetrahedral
Correct answer is option 'C'. Can you explain this answer?

Rhea Joshi answered  •  16 hours ago
Coordination Number of [Ni(CN)4]2−
The coordination number refers to the number of ligand atoms that are directly bonded to the central metal atom in a complex. In the case of [Ni(CN)4]2−, nickel (Ni) is surrounded by four cyanide (CN) ligands.
- The cyanide ion (CN−) is a bidentate ligand, meaning each CN− ligand forms one bond with the nickel ion.
- Therefore, the total co
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Direction: Read the following text and answer the following questions on the basis of the same:
Polio drops are delivered to 50K children in a district. The rate at which polio drops are given is directly proportional to the number of children who have not been administered the drops. By the end of 2nd week half the children have been given the polio drops. How many will have been given the drops by the end of 3rd week can be estimated using the solution to the differential equation dy/dx = k(50 - y) where x denotes the number of weeks and y the number of children who have been given the drops.
Q. Which method of solving a differential equation can be used to solve dy/dx = k(50 - y)?
  • a)
    Variable separable method
  • b)
    Solving Homogeneous differential equation
  • c)
    Solving Linear differential equation
  • d)
    All of the above
Correct answer is option 'A'. Can you explain this answer?

Rhea Joshi answered  •  17 hours ago
Understanding the Differential Equation
The given differential equation is dy/dx = k(50 - y). This represents a logistic growth model, where the rate of change of y (number of children who have received polio drops) is proportional to the remaining number of children (50 - y).
Method of Solving: Variable Separable Method
- Variable Separation: This method involv
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Solution of the differential equation tan y sec2 x dx + tan x sec2 y dy = 0 is
a)tan x . tan y =K
b)tan x - tan y = K
c)tan x/tan y = K
d)none
Correct answer is option 'A'. Can you explain this answer?

Rhea Joshi answered  •  17 hours ago
Understanding the Differential Equation
The given differential equation is:
tan y sec² x dx + tan x sec² y dy = 0.
This can be rewritten as:
sec² x dx = - (tan x sec² y)/(tan y) dy.
Separation of Variables
We can separate the variables to facilitate integration:
- (tan y)/(sec² y) dy = - (tan x)/(sec² x) dx.
This leads to:
- sin² y dy = -
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Which of the following is correct ?
  • a)
    Cos 1 > Cos 2
  • b)
    Cos 1 < Cos 2
  • c)
    Cos 1 = Cos 2
  • d)
    None of these
Correct answer is option 'A'. Can you explain this answer?

Disha Tiwari answered  •  yesterday
Understanding the Cosine Function
The cosine function, denoted as cos(x), is a periodic function that oscillates between -1 and 1. The values of cosine decrease in the interval from 0 to π (approximately 3.14), which is crucial for this comparison.
Evaluating Cosine Values
- Cosine at 1 Radian:
- Cos(1) is approximately 0.5403.
- Cosine at 2 Radia
... more:
- Cos(2) is approximately -0.4161.
Comparison Between Cos(1) and Cos(2)
- Since Cos(1) ≈ 0.5403 and Cos(2) ≈ -0.4161, it is evident that:
- Cos(1) > Cos(2).
Conclusion
- The correct option is A: Cos 1 > Cos 2.
- This conclusion is based on the fundamental properties of the cosine function and its behavior in the specified range of angles.
Understanding these key points will help reinforce the importance of cosine values in mathematics, particularly in trigonometry relevant to the JEE syllabus.

Dipole moment in chemistry?

Nisha Dey answered  •  yesterday
What is a Dipole Moment?
A dipole moment is a measure of the separation of positive and negative electrical charges within a molecule. It indicates the polarity of a chemical bond and is a vector quantity.
Key Characteristics of Dipole Moment:
- Definition: It is defined as the product of the charge and the distance between the centers of positive and negative c
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Aspirin is chemically:
  • a)
     Methyl benzoate
  • b)
     Ethyl salicylate
  • c)
     Acetyl salicylic acid
  • d)
     o-hydroxy benzoic acid
Correct answer is option 'D'. Can you explain this answer?

Siddharth Nair answered  •  yesterday
Understanding Aspirin's Chemical Structure
Aspirin, commonly known as acetylsalicylic acid, is a widely used medication. Let's explore its correct chemical identity and why option 'D' is not accurate.
Correct Chemical Name of Aspirin
- Acetylsalicylic acid is the correct chemical name for aspirin.
- It is synthesized from salicylic acid and acetic anhydrid
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Propanal on treatment with dilute sodium hydroxide gives:
  • a)
    CH3CH2CH2CH2CH2CHO
  • b)
    CH3CH2CH(OH)CH2CH2CHO
  • c)
    CH3CH2CH(OH)CH (CH3)CHO
  • d)
    CH3CH2COOH
Correct answer is option 'C'. Can you explain this answer?

Gaurav Dasgupta answered  •  yesterday
Understanding the Reaction of Propanal with Dilute Sodium Hydroxide
Propanal (CH3CHO) is an aldehyde that can undergo aldol condensation when treated with dilute sodium hydroxide. This process involves several steps leading to the formation of a specific product.
Initial Step: Formation of Enolate Ion
- When propanal is treated with dilute sodium hydroxide, the base ab
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The eccentricity of a standard ellipse whose length of latus rectum is equal to distance between its foci is
  • a)
    2 sin 18
  • b)
    2 sin 36
  • c)
    sin 18
  • d)
    cos 36
Correct answer is option 'A'. Can you explain this answer?

Gaurav Dasgupta answered  •  yesterday
Understanding the Problem
To find the eccentricity of a standard ellipse where the length of the latus rectum equals the distance between its foci, we need to establish key relationships in the geometry of an ellipse.
Key Definitions
- Length of Latus Rectum (L): For an ellipse with semi-major axis 'a' and semi-minor axis 'b', the length of the latus rectum is g
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Consider the following statements:
(i) Atomic radii decreases across a row of the periodic table when we move from left to right.
(ii) Atomic radii increases down the column as we move from top to bottom.
(iii) Although the order of elements is based on atomic numbers, vertical families share similar chemical properties.
Which of the statement(s) given above is/are correct?
  • a)
    (i) and (ii)
  • b)
    (i) and (iii)
  • c)
    (ii) and (iii)
  • d)
    (i), (ii) and (iii)
Correct answer is option 'D'. Can you explain this answer?

Rhea Joshi answered  •  yesterday
Understanding Atomic Radii Trends
The question assesses knowledge of atomic radii trends in the periodic table. Let's analyze each statement to confirm their validity.
Statement (i): Atomic radii decreases across a row of the periodic table when we move from left to right.
- This statement is correct.
- As we move from left to right in a period, the increa
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The half-life of a first-order reaction is 60 seconds. What is the rate constant k?  (Given: ln⁡(2)=0.693)
  • a)
    0.012 s−1
  • b)
    0.0115 s−1
  • c)
    0.005 s−1
  • d)
    0.693 s−1
Correct answer is option 'B'. Can you explain this answer?

Rhea Joshi answered  •  yesterday
Understanding Half-Life in First-Order Reactions
In first-order reactions, the half-life (t1/2) is related to the rate constant (k) by the following equation:
- t1/2 = 0.693 / k
Given that the half-life of the reaction is 60 seconds, we can rearrange the formula to solve for k.
Calculating the Rate Constant (k)
1. Start with the half-life formula:
- t1/
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Which is wrong?
  • a)
    Body's first line of defence is skin
  • b)
    Second line of defence is skin adn phagocytic cells
  • c)
    Third line of defence is immune system
  • d)
    Lines of body defence are skin, phagocytic cells and immune system
Correct answer is option 'B'. Can you explain this answer?

Rhea Joshi answered  •  yesterday
Understanding the Body's Defense Mechanisms
The human body has a sophisticated defense system to protect against pathogens. It is categorized into three lines of defense:
First Line of Defense: Skin
- The skin serves as a physical barrier against pathogens.
- It prevents the entry of bacteria, viruses, and other harmful microorganisms.
Second Line of Def
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- This includes phagocytic cells (like macrophages and neutrophils) that ingest and destroy pathogens.
- The second line of defense is activated when the first line is breached, involving various immune responses such as inflammation and fever.
Third Line of Defense: Immune System
- The immune system involves specialized cells (like lymphocytes) that recognize specific pathogens.
- It provides long-lasting immunity through the production of antibodies.
Why Option B is Incorrect
- The statement "Second line of defense is skin and phagocytic cells" is misleading.
- Skin is not part of the second line; it is solely the first line of defense.
- The second line is primarily composed of phagocytic cells and other immune responses that occur after the skin barrier is compromised.
Summary
- The correct categorization of defenses is crucial for understanding how the body protects itself.
- Option B incorrectly combines the roles of skin and phagocytic cells, leading to confusion about their respective functions in the immune system.

Pls explain this formulae w=z×i×t?

Rhea Joshi answered  •  yesterday
Understanding the Formula: w = z × i × t
The formula w = z × i × t represents a relationship between three variables often encountered in physics and engineering contexts. Here's a detailed breakdown:
Components of the Formula
- w: Represents the work done or energy transferred, usually measured in joules (J).
- z: Denotes the force or the amount of
... more

In amplitude modulation , sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth (Δωm) of the signal is such that Δωm << ωc. Which of the following frequencies is not contained in the modulated wave ?
  • a)
    ωm + ωc
  • b)
    ωc - ωm
  • c)
    ωm
  • d)
    ωc
Correct answer is option 'C'. Can you explain this answer?

Rhea Joshi answered  •  yesterday
Understanding Amplitude Modulation
In amplitude modulation (AM), a carrier wave is modulated by a message signal. The frequencies involved are critical to determining the output of the modulated wave.
Key Frequencies in AM
- The carrier frequency is represented by ωc.
- The message (or signal) frequency is represented by ωm.
- The bandwidth of the signal is d
... more

Match the catalysts to the correct processes :
Catalyst                 Process
a. TiCl3          (i) Wacker process
b. PdCl       (ii) Ziegler-Natta polymerization
c. CuCl2        (iii) Contact process
d. V2O5         (iv) Deacon's process
  • a)
    a(iii), b(ii), c(iv), d(i)
  • b)
    a(ii), b(i), c(iv), d(iii)
  • c)
    a(ii), b(iii), c(iv), d(i)
  • d)
    a(iii), b(i), c(ii), d(iv)
Correct answer is option 'B'. Can you explain this answer?

Upasana Nambiar answered  •  2 days ago
Understanding the Catalysts and Their Processes
In this explanation, we will match the catalysts to their corresponding processes, clarifying why option 'B' is correct.
Catalysts and Their Processes
- TiCl3:
- This catalyst is primarily used in the Ziegler-Natta polymerization process. It aids in the polymerization of alkenes to produce polymers li
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A small ball is connected to a block by a light string of length ℓ . Both are initially on the ground. There is sufficient friction on the ground to prevent the block from slipping. The ball is projected vertically up with a velocity u where 2gℓ < u2 < 3gℓ . The centre of mass of the "block + ball" system is C. Then
  • a)
    C will move along a circle
  • b)
    C will move along a parabola
  • c)
    C will move along a straight line
  • d)
    The horizontal component of the velocity of the ball will first increase and then decrease
Correct answer is option 'A,D'. Can you explain this answer?

EduRev JEE answered  •  2 days ago
As the block does not move, the ball moves along a circular path of radius l. The center of mass of the system always lies somewhere on the string.
Let v = speed of ball when the string makes an angle θ with the horizontal.
1/2 mv2 = 1/2 mu2 - mg l sin θ
The horizontal component of v = V = vsin θ = sin θ (u2 - 2g l sin θ
For V to be maximum, dV/dθ = 0, which gives sin θ = u2 /3gl.

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Akash Ghoshal answered  •  2 days ago
Introduction to the Physical World
The study of physics is fundamental to understanding the universe and the laws that govern it. It encompasses a wide range of topics and principles that explain natural phenomena.
Scope of Physics
Physics covers various domains, each with its unique focus:
  • Classical Mechanics: Examines the motion of objects and the... more
  • Thermodynamics: Studies heat, energy, and the laws governing their transformations.
  • Electromagnetism: Investigates electric and magnetic fields and their interactions.
  • Optics: Focuses on the behavior of light and its properties.
  • Quantum Mechanics: Explores the behavior of particles at the atomic and subatomic levels.
  • Relativity: Addresses the effects of gravity and the structure of spacetime.
  • Nuclear Physics: Studies the components and behavior of atomic nuclei.
  • Astrophysics: Examines the physical properties of celestial bodies and the universe.

Importance of Physics
  • Foundation of Science: Physics provides the foundational principles for all scientific disciplines.
  • Technological Advancements: Innovations in technology, from electronics to medical equipment, stem from physics.
  • Problem Solving: Encourages critical thinking and analytical skills useful in various fields.
  • Interdisciplinary Connections: Integrates with chemistry, biology, engineering, and environmental science.

In summary, the scope of physics is vast and integral to our understanding of the natural world, making it a crucial subject for aspiring scientists and engineers.

The standard deviation of 25 numbers is 40. If each of the numbers is increased by 5, then the new standard deviation will be
  • a)
    40
  • b)
    45
  • c)
    40 + 21/25
  • d)
    none of these
Correct answer is option 'A'. Can you explain this answer?

Akash Ghoshal answered  •  2 days ago
Understanding Standard Deviation
Standard deviation measures the dispersion or spread of a set of numbers. It indicates how much the values deviate from the mean.
Effect of Constant Addition on Standard Deviation
When a constant is added to each number in a dataset, the following occurs:
- The mean of the dataset increases by that constant.
- The spread or di
... more
Navdeep Dhaliwal asked a question

Direction: Read the passage given below:
  1. I got posted in Srinagar in the 1980s. Its rugged mountains, gushing rivers and vast meadows reminded me of the landscapes of my native place – the Jibhi Valley in Himachal Pradesh. Unlike Srinagar that saw numerous tourists, Jibhi Valley remained clouded in anonymity. That’s when the seed of starting tourism in Jibhi was planted. I decided to leave my service in the Indian Army and follow the urge to return home.
  2. We had two houses – a family house and a traditional house, which we often rented out. I pleaded with my father to ask the tenant to vacate the house so that I could convert it into a guesthouse. When my family finally relented, I renovated the house keeping its originality intact, just adding windows for sunlight.
  3. I still remember the summer of 1992 when I put a signboard outside my first guesthouse in Jibhi Valley! The village residents, however, were sceptical about my success. My business kept growing but it took years for tourism to take off in Jibhi Valley. Things changed significantly after 2008 when the government launched a homestay scheme. People built homestays and with rapid tourism growth, the region changed rapidly. Villages turned into towns with many concrete buildings. Local businesses and tourists continued putting a burden on nature.
  4. Then, with the 2020-21 pandemic and lockdown, tourism came to a complete standstill in Jibhi Valley. Local people, who were employed at over a hundred homestays and guesthouses, returned to their villages. Some went back to farming; some took up pottery and some got involved in government work schemes. Now, all ardently hope that normalcy and tourism will return to the valley soon. In a way, the pandemic has given us an opportunity to introspect, go back to our roots and look for sustainable solutions.
  5. For me, tourism has been my greatest teacher. It brought people from many countries and all states of India to my guesthouse. It gave me exposure to different cultures and countless opportunities to learn new things. Most people who stayed at my guesthouse became my regular clients and good friends. When I look back, I feel proud, yet humbled at the thought that I was not only able to fulfill my dream despite all the challenges, but also played a role in establishing tourism in the beautiful valley that I call home.
Q. Select the option that suitably completes the given dialogue as per the context in paragraph II.
Father: Are you sure that your plan would work?
Writer: I can’t say (1) ______________.
Father: That’s a lot of uncertainty, isn’t it?
Writer: (2) _______________, father. Please let’s do this.
... more

Aditya Samaddar asked a question

Direction: Read the passage given below:
  1. I got posted in Srinagar in the 1980s. Its rugged mountains, gushing rivers and vast meadows reminded me of the landscapes of my native place – the Jibhi Valley in Himachal Pradesh. Unlike Srinagar that saw numerous tourists, Jibhi Valley remained clouded in anonymity. That’s when the seed of starting tourism in Jibhi was planted. I decided to leave my service in the Indian Army and follow the urge to return home.
  2. We had two houses – a family house and a traditional house, which we often rented out. I pleaded with my father to ask the tenant to vacate the house so that I could convert it into a guesthouse. When my family finally relented, I renovated the house keeping its originality intact, just adding windows for sunlight.
  3. I still remember the summer of 1992 when I put a signboard outside my first guesthouse in Jibhi Valley! The village residents, however, were sceptical about my success. My business kept growing but it took years for tourism to take off in Jibhi Valley. Things changed significantly after 2008 when the government launched a homestay scheme. People built homestays and with rapid tourism growth, the region changed rapidly. Villages turned into towns with many concrete buildings. Local businesses and tourists continued putting a burden on nature.
  4. Then, with the 2020-21 pandemic and lockdown, tourism came to a complete standstill in Jibhi Valley. Local people, who were employed at over a hundred homestays and guesthouses, returned to their villages. Some went back to farming; some took up pottery and some got involved in government work schemes. Now, all ardently hope that normalcy and tourism will return to the valley soon. In a way, the pandemic has given us an opportunity to introspect, go back to our roots and look for sustainable solutions.
  5. For me, tourism has been my greatest teacher. It brought people from many countries and all states of India to my guesthouse. It gave me exposure to different cultures and countless opportunities to learn new things. Most people who stayed at my guesthouse became my regular clients and good friends. When I look back, I feel proud, yet humbled at the thought that I was not only able to fulfill my dream despite all the challenges, but also played a role in establishing tourism in the beautiful valley that I call home.
Q. Select the option that clearly indicates the situation before and after 2008, in Jibhi Valley.
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Alok Patel asked a question

Directions to Solve
In each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and
Give answer
  • (A) If the data in statement I alone are sufficient to answer the question, while the data in statement II alone are not sufficient to answer the question
  • (B) If the data in statement II alone are sufficient to answer the question, while the data in statement I alone are not sufficient to answer the question
  • (C) If the data either in statement I alone or in statement II alone are sufficient to answer the question
  • (D) If the data given in both statements I and II together are not sufficient to answer the question and
  • (E) If the data in both statements I and II together are necessary to answer the question.
 
Question -
 
Question: Can Ritesh retire from office X in January 2006, with full pension benefits ?
Statements:
I.
Ritesh will complete 30 years of service in office X in April 2000 and desires to retire.

II.As per office X rules, an employee has to complete minimum 30 years of service and attain age of 60. Ritesh has 3 years to complete age of 60.
 
 
... more

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