Q. In which of the following scenarios does light become polarized by reflection?
A.
When it passes through a prism
B.
When it reflects off a smooth surface at a specific angle
C.
When it travels through a foggy medium
D.
When it is diffracted through a narrow slit
Show solution
Solution
Light becomes polarized by reflection when it reflects off a smooth surface at Brewster's angle.
Correct Answer:
B
— When it reflects off a smooth surface at a specific angle
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Q. In which of the following scenarios does light become polarized?
A.
When it passes through a prism
B.
When it reflects off a non-metallic surface
C.
When it travels through a vacuum
D.
When it diffracts through a slit
Show solution
Solution
Light becomes polarized when it reflects off a non-metallic surface, as the reflected light tends to align in a particular direction.
Correct Answer:
B
— When it reflects off a non-metallic surface
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Q. In which of the following scenarios does the buoyant force act?
A.
An object floating on water
B.
A balloon rising in air
C.
A ship in the ocean
D.
All of the above
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Solution
The buoyant force acts on any object submerged in a fluid, including floating objects, balloons, and ships.
Correct Answer:
D
— All of the above
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Q. In which of the following scenarios does viscosity increase?
A.
Heating a fluid
B.
Cooling a fluid
C.
Adding a solvent
D.
Increasing pressure
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Solution
Viscosity generally increases when a fluid is cooled.
Correct Answer:
B
— Cooling a fluid
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Q. In which of the following scenarios is light most likely to be polarized?
A.
When it passes through a prism
B.
When it reflects off a smooth surface
C.
When it travels through a vacuum
D.
When it diffracts through a narrow slit
Show solution
Solution
Light is most likely to be polarized when it reflects off a smooth surface, such as water or glass.
Correct Answer:
B
— When it reflects off a smooth surface
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Q. In which of the following scenarios is light polarized?
A.
Light from a candle
B.
Light from a laser
C.
Light from an incandescent bulb
D.
Light from a fluorescent lamp
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Solution
Light from a laser is typically polarized, while the other sources emit unpolarized light.
Correct Answer:
B
— Light from a laser
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Q. In which of the following scenarios is the entropy of the system likely to decrease?
A.
Ice melting
B.
Water freezing
C.
Gas expanding
D.
Liquid evaporating
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Solution
The entropy of the system decreases when water freezes, as the molecules become more ordered in the solid state.
Correct Answer:
B
— Water freezing
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Q. In which of the following scenarios is the magnetic force on a charged particle zero?
A.
When the particle is at rest
B.
When the particle moves parallel to the magnetic field
C.
When the particle moves perpendicular to the magnetic field
D.
Both 1 and 2
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Solution
The magnetic force on a charged particle is zero when it is at rest or when it moves parallel to the magnetic field.
Correct Answer:
D
— Both 1 and 2
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Q. In which of the following scenarios is ΔG equal to ΔH?
A.
At high temperatures with ΔS = 0.
B.
At low temperatures with ΔS = 0.
C.
At constant pressure and temperature.
D.
In a phase transition.
Show solution
Solution
During a phase transition, such as melting or boiling, ΔG equals ΔH because the system is at equilibrium.
Correct Answer:
D
— In a phase transition.
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Q. In which of the following scenarios will a charged particle experience no magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both A and C
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Solution
A charged particle experiences no magnetic force when it is either at rest or moving parallel to the magnetic field.
Correct Answer:
D
— Both A and C
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Q. In which of the following scenarios will a charged particle experience the maximum magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
When moving at an angle of 45 degrees
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Solution
A charged particle experiences maximum magnetic force when moving perpendicular to the magnetic field, as sin(90°) = 1.
Correct Answer:
B
— When moving perpendicular to the magnetic field
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Q. In which of the following scenarios will a charged particle not experience any magnetic force?
A.
When moving parallel to the magnetic field
B.
When moving perpendicular to the magnetic field
C.
When at rest
D.
Both a and c
Show solution
Solution
A charged particle will not experience any magnetic force when it is at rest or moving parallel to the magnetic field.
Correct Answer:
D
— Both a and c
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Q. In which of the following scenarios will a magnetic field be produced?
A.
A stationary charge
B.
A moving charge
C.
A neutral atom
D.
A charged particle at rest
Show solution
Solution
A magnetic field is produced by a moving charge. A stationary charge does not produce a magnetic field.
Correct Answer:
B
— A moving charge
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Q. In which of the following scenarios will total internal reflection NOT occur?
A.
Light traveling from diamond to air
B.
Light traveling from water to air
C.
Light traveling from air to glass
D.
Light traveling from glass to air
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Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer:
C
— Light traveling from air to glass
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Q. In which of the following scenarios will total internal reflection occur?
A.
Light from air to water
B.
Light from glass to air
C.
Light from water to glass
D.
Light from air to glass
Show solution
Solution
Total internal reflection occurs when light travels from a denser medium (glass) to a less dense medium (air) at an angle greater than the critical angle.
Correct Answer:
B
— Light from glass to air
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Q. In which of the following scenarios would the entropy of the system decrease?
A.
Ice melting
B.
Water evaporating
C.
Gas compressing
D.
Sugar dissolving in water
Show solution
Solution
When a gas is compressed, the number of microstates decreases, leading to a decrease in entropy.
Correct Answer:
C
— Gas compressing
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Q. In which of the following scenarios would total internal reflection NOT occur?
A.
Light traveling from diamond to air.
B.
Light traveling from water to air.
C.
Light traveling from air to glass.
D.
Light traveling from glass to water.
Show solution
Solution
Total internal reflection cannot occur when light travels from a rarer medium (air) to a denser medium (glass).
Correct Answer:
C
— Light traveling from air to glass.
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Q. In which of the following scenarios would you expect a fluid to have lower viscosity?
A.
At lower temperatures
B.
At higher temperatures
C.
Under high pressure
D.
In a narrow pipe
Show solution
Solution
Fluids generally have lower viscosity at higher temperatures.
Correct Answer:
B
— At higher temperatures
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Q. In which of the following scenarios would you expect a fluid to have the lowest viscosity?
A.
High temperature
B.
Low temperature
C.
High pressure
D.
Low pressure
Show solution
Solution
A fluid typically has the lowest viscosity at high temperatures.
Correct Answer:
A
— High temperature
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Q. In which of the following scenarios would you expect a liquid to have the highest viscosity?
A.
At high temperatures
B.
At low temperatures
C.
When mixed with gases
D.
When agitated
Show solution
Solution
Viscosity generally decreases with increasing temperature, so a liquid would have the highest viscosity at low temperatures.
Correct Answer:
B
— At low temperatures
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Q. In which of the following scenarios would you expect to observe a decrease in viscosity?
A.
Cooling a liquid
B.
Heating a liquid
C.
Increasing pressure
D.
Adding a solute
Show solution
Solution
Heating a liquid generally decreases its viscosity, allowing it to flow more freely.
Correct Answer:
B
— Heating a liquid
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Q. In which of the following scenarios would you expect to see the effects of viscosity most prominently?
A.
A river flowing rapidly
B.
Oil pouring from a bottle
C.
Air moving around a plane
D.
Water boiling
Show solution
Solution
The effects of viscosity are most prominently observed when oil pours from a bottle, as it flows slowly due to its higher viscosity.
Correct Answer:
B
— Oil pouring from a bottle
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Q. In which of the following species does the molecular orbital configuration show a paramagnetic behavior?
Show solution
Solution
O2 has unpaired electrons in its molecular orbital configuration, making it paramagnetic.
Correct Answer:
B
— O2
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Q. In which of the following states does a liquid exhibit the highest density?
A.
At low temperatures
B.
At high temperatures
C.
At critical temperature
D.
At boiling point
Show solution
Solution
Liquids generally exhibit the highest density at low temperatures.
Correct Answer:
A
— At low temperatures
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Q. In which of the following states of matter do particles have the least freedom of movement?
A.
Solid
B.
Liquid
C.
Gas
D.
Plasma
Show solution
Solution
In solids, particles are closely packed and have limited movement.
Correct Answer:
A
— Solid
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Q. In which part of the chloroplast does the Calvin cycle take place? (2019)
A.
Thylakoid membrane
B.
Stroma
C.
Granum
D.
Outer membrane
Show solution
Solution
The Calvin cycle takes place in the stroma of the chloroplast.
Correct Answer:
B
— Stroma
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Q. In which part of the flower does fertilization occur? (2019)
A.
Stamen
B.
Ovary
C.
Style
D.
Petal
Show solution
Solution
Fertilization occurs in the ovary, where the male gamete from the pollen fuses with the female gamete in the ovule.
Correct Answer:
B
— Ovary
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Q. In which part of the plant does most of the photosynthesis occur?
A.
Roots
B.
Stems
C.
Leaves
D.
Flowers
Show solution
Solution
Most of the photosynthesis occurs in the leaves, where chloroplasts are abundant.
Correct Answer:
C
— Leaves
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Q. In which part of the plant does most of the respiration occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
Show solution
Solution
Most of the respiration occurs in the roots, where energy is needed for nutrient uptake and growth.
Correct Answer:
A
— Roots
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Q. In which part of the plant does most respiration occur? (2020)
A.
Roots
B.
Leaves
C.
Stems
D.
Flowers
Show solution
Solution
Most respiration occurs in the roots, where energy is needed for nutrient uptake and growth.
Correct Answer:
A
— Roots
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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!
