Major Competitive Exams

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Major Competitive Exams

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Major Competitive Exams MCQ & Objective Questions

Major Competitive Exams play a crucial role in shaping the academic and professional futures of students in India. These exams not only assess knowledge but also test problem-solving skills and time management. Practicing MCQs and objective questions is essential for scoring better, as they help in familiarizing students with the exam format and identifying important questions that frequently appear in tests.

What You Will Practise Here

Key concepts and theories related to major subjects
Important formulas and their applications
Definitions of critical terms and terminologies
Diagrams and illustrations to enhance understanding
Practice questions that mirror actual exam patterns
Strategies for solving objective questions efficiently
Time management techniques for competitive exams

Exam Relevance

The topics covered under Major Competitive Exams are integral to various examinations such as CBSE, State Boards, NEET, and JEE. Students can expect to encounter a mix of conceptual and application-based questions that require a solid understanding of the subjects. Common question patterns include multiple-choice questions that test both knowledge and analytical skills, making it essential to be well-prepared with practice MCQs.

Common Mistakes Students Make

Rushing through questions without reading them carefully
Overlooking the negative marking scheme in MCQs
Confusing similar concepts or terms
Neglecting to review previous years’ question papers
Failing to manage time effectively during the exam

FAQs

Question: How can I improve my performance in Major Competitive Exams?
Answer: Regular practice of MCQs and understanding key concepts will significantly enhance your performance.

Question: What types of questions should I focus on for these exams?
Answer: Concentrate on important Major Competitive Exams questions that frequently appear in past papers and mock tests.

Question: Are there specific strategies for tackling objective questions?
Answer: Yes, practicing under timed conditions and reviewing mistakes can help develop effective strategies.

Start your journey towards success by solving practice MCQs today! Test your understanding and build confidence for your upcoming exams. Remember, consistent practice is the key to mastering Major Competitive Exams!

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Q. Which of the following statements is true about isotopes?

A. They have the same number of protons
B. They have different chemical properties
C. They have different atomic numbers
D. They have the same mass number

Solution

Isotopes have the same number of protons but different numbers of neutrons.

Correct Answer: A — They have the same number of protons

Q. Which of the following statements is true about ketones?

A. They can be oxidized to carboxylic acids
B. They have a higher boiling point than aldehydes
C. They cannot form hydrogen bonds
D. They are more reactive than aldehydes

Solution

Ketones cannot form hydrogen bonds with themselves due to the absence of a hydrogen atom attached to the carbonyl carbon.

Correct Answer: C — They cannot form hydrogen bonds

Q. Which of the following statements is true about liquids?

A. They have a definite shape.
B. They are incompressible.
C. They have a fixed volume.
D. Both B and C.

Solution

Liquids have a fixed volume and are incompressible, but they do not have a definite shape.

Correct Answer: D — Both B and C.

Q. Which of the following statements is true about magnetic field lines?

A. They can cross each other
B. They are closed loops
C. They start from south and end at north
D. They are always straight lines

Solution

Magnetic field lines are closed loops; they do not start or end but continue infinitely.

Correct Answer: B — They are closed loops

Q. Which of the following statements is true about phenols? (2023)

A. They are stronger acids than alcohols
B. They do not react with bases
C. They are less soluble in water than alcohols
D. They are non-toxic

Solution

Phenols are stronger acids than alcohols due to the resonance stabilization of the phenoxide ion.

Correct Answer: A — They are stronger acids than alcohols

Q. Which of the following statements is true about real gases compared to ideal gases?

A. Real gases obey gas laws perfectly
B. Real gases have no intermolecular forces
C. Real gases occupy no volume
D. Real gases deviate from ideal behavior at high pressure

Solution

Real gases deviate from ideal behavior at high pressures and low temperatures due to intermolecular forces and finite volume.

Correct Answer: D — Real gases deviate from ideal behavior at high pressure

Q. Which of the following statements is true about real gases?

A. They obey the ideal gas law at all conditions
B. They have no volume
C. They experience intermolecular forces
D. They cannot be liquefied

Solution

Real gases experience intermolecular forces, which is why they deviate from ideal behavior under certain conditions.

Correct Answer: C — They experience intermolecular forces

Q. Which of the following statements is true about redox reactions?

A. They always involve the transfer of protons.
B. They involve the transfer of electrons.
C. They do not involve changes in oxidation states.
D. They can only occur in acidic solutions.

Solution

Redox reactions involve the transfer of electrons between species.

Correct Answer: B — They involve the transfer of electrons.

Q. Which of the following statements is true about s-block elements?

A. They have completely filled d-orbitals
B. They have one or two electrons in their outermost shell
C. They are all gases at room temperature
D. They form acidic oxides

Solution

S-block elements have one or two electrons in their outermost shell.

Correct Answer: B — They have one or two electrons in their outermost shell

Q. Which of the following statements is true about sound waves? (2023)

A. They can travel through a vacuum
B. They are transverse waves
C. They require a medium to travel
D. They travel faster in air than in water

Solution

Sound waves require a medium (solid, liquid, or gas) to travel and cannot propagate through a vacuum.

Correct Answer: C — They require a medium to travel

Q. Which of the following statements is true about surface tension? (2019)

A. It is a property of solids
B. It causes liquids to minimize their surface area
C. It is independent of temperature
D. It is only present in water

Solution

Surface tension is a property of liquids that causes them to minimize their surface area, allowing them to form droplets.

Correct Answer: B — It causes liquids to minimize their surface area

Q. Which of the following statements is true about the behavior of real gases?

A. They obey gas laws perfectly
B. They have no volume
C. They experience intermolecular forces
D. They are always ideal

Solution

Real gases experience intermolecular forces and do not behave ideally under all conditions.

Correct Answer: C — They experience intermolecular forces

Q. Which of the following statements is true about the center of mass of a system?

A. It always lies within the physical body
B. It can lie outside the physical body
C. It is always at the geometric center
D. It is the point where all mass is concentrated

Solution

The center of mass can lie outside the physical body, especially in irregularly shaped objects.

Correct Answer: B — It can lie outside the physical body

Q. Which of the following statements is true about the complex ion [Co(NH3)6]3+?

A. It is paramagnetic
B. It is diamagnetic
C. It has a coordination number of 4
D. It contains a transition metal

Solution

Cobalt is a transition metal, and the complex has a coordination number of 6.

Correct Answer: D — It contains a transition metal

Q. Which of the following statements is true about the complex [Cr(NH3)6]3+?

A. It is tetrahedral
B. It is octahedral
C. It is square planar
D. It is linear

Solution

[Cr(NH3)6]3+ has an octahedral geometry due to the six ligands surrounding the chromium ion.

Correct Answer: B — It is octahedral

Q. Which of the following statements is true about the complex [Fe(CN)6]3-?

A. It is paramagnetic
B. It is diamagnetic
C. It has a coordination number of 4
D. It contains only monodentate ligands

Solution

[Fe(CN)6]3- is diamagnetic because all the electrons are paired in the d-orbitals of Fe in the +3 oxidation state.

Correct Answer: B — It is diamagnetic

Q. Which of the following statements is true about the critical angle for total internal reflection? (2020)

A. It is always less than 90 degrees
B. It is always greater than 90 degrees
C. It is equal to 90 degrees
D. It depends on the medium

Solution

The critical angle is defined as the angle of incidence above which total internal reflection occurs, and it is always less than 90 degrees.

Correct Answer: A — It is always less than 90 degrees

Q. Which of the following statements is true about the electron configuration of an atom?

A. Electrons fill orbitals in order of increasing energy
B. Electrons can occupy the same orbital with opposite spins
C. Both A and B
D. None of the above

Solution

Both statements A and B are true regarding electron configurations.

Correct Answer: C — Both A and B

Q. Which of the following statements is true about the emission spectrum of hydrogen?

A. It is continuous
B. It consists of discrete lines
C. It is only visible in ultraviolet
D. It has no relation to energy levels

Solution

The emission spectrum of hydrogen consists of discrete lines corresponding to specific energy transitions between levels.

Correct Answer: B — It consists of discrete lines

Q. Which of the following statements is true about the energy levels of an electron in an atom?

A. They are continuous
B. They are quantized
C. They can be any value
D. They depend on temperature

Solution

The energy levels of an electron in an atom are quantized, meaning they can only take on specific values.

Correct Answer: B — They are quantized

Q. Which of the following statements is true about the equation 4x - 5y = 20?

A. It represents a vertical line.
B. It has a positive slope.
C. It has no x-intercept.
D. It is a horizontal line.

Solution

Rearranging the equation to slope-intercept form gives y = (4/5)x - 4, indicating a positive slope.

Correct Answer: B — It has a positive slope.

Q. Which of the following statements is true about the equilibrium constant Kp?

A. Kp is always equal to Kc
B. Kp depends on temperature
C. Kp is independent of pressure
D. Kp is always greater than Kc

Solution

Kp is dependent on temperature and can vary with changes in temperature.

Correct Answer: B — Kp depends on temperature

Q. Which of the following statements is true about the equilibrium constant? (2019)

A. Kc changes with temperature.
B. Kc is dependent on the concentration of reactants.
C. Kc is the same for all reactions at a given temperature.
D. Kc is always greater than 1.

Solution

The equilibrium constant Kc is temperature-dependent; it changes with temperature but is constant for a given reaction at a specific temperature.

Correct Answer: A — Kc changes with temperature.

Q. Which of the following statements is true about the function f(x) = 1/(x-1)? (2022)

A. Continuous at x = 1
B. Continuous everywhere
C. Not continuous at x = 1
D. Continuous at x = 0

Solution

The function f(x) = 1/(x-1) is not continuous at x = 1 because it is undefined there.

Correct Answer: C — Not continuous at x = 1

Q. Which of the following statements is true about the function f(x) = 1/(x-3)?

A. Continuous at x = 3
B. Continuous everywhere
C. Not continuous at x = 3
D. Continuous at x = 0

Solution

The function f(x) = 1/(x-3) is not defined at x = 3, hence it is not continuous at that point.

Correct Answer: C — Not continuous at x = 3

Q. Which of the following statements is true about the function f(x) = |x|?

A. Continuous everywhere
B. Discontinuous at x = 0
C. Continuous only at x = 1
D. Discontinuous everywhere

Solution

The function f(x) = |x| is continuous everywhere, including at x = 0.

Correct Answer: A — Continuous everywhere

Q. Which of the following statements is true about the graph of a function that is periodic?

A. It repeats its values at regular intervals.
B. It is always increasing.
C. It has no maximum or minimum values.
D. It is a straight line.

Solution

A periodic function is characterized by repeating values at regular intervals, such as sine and cosine functions.

Correct Answer: A — It repeats its values at regular intervals.

Q. Which of the following statements is true about the image formed by a concave lens? (2023)

A. Always real
B. Always virtual
C. Can be real or virtual
D. Always inverted

Solution

A concave lens always forms a virtual image regardless of the position of the object.

Correct Answer: B — Always virtual

Q. Which of the following statements is true about the image formed by a convex lens? (2021)

A. Always real
B. Always virtual
C. Can be real or virtual
D. Always inverted

Solution

A convex lens can form both real and virtual images depending on the position of the object relative to the focal point.

Correct Answer: C — Can be real or virtual

Q. Which of the following statements is true about the image formed by a plane mirror? (2022)

A. It is real and inverted
B. It is virtual and erect
C. It is diminished
D. It is always located behind the mirror

Solution

The image formed by a plane mirror is virtual, erect, and located behind the mirror at the same distance as the object.

Correct Answer: B — It is virtual and erect

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