Q. In a tensile test, if a material shows a linear relationship between stress and strain up to a certain point, this point is known as:
A.
Yield point
B.
Ultimate tensile strength
C.
Elastic limit
D.
Fracture point
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Solution
The elastic limit is the maximum stress that a material can withstand while still returning to its original shape.
Correct Answer:
C
— Elastic limit
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Q. In a tensile test, if a material shows a linear relationship between stress and strain, it is said to be in which region?
A.
Plastic region
B.
Elastic region
C.
Yield point
D.
Fracture point
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Solution
The linear relationship between stress and strain indicates that the material is in the elastic region.
Correct Answer:
B
— Elastic region
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Q. In a tensile test, if the stress-strain curve of a material shows a linear relationship, what does this indicate?
A.
The material is elastic
B.
The material is plastic
C.
The material has failed
D.
The material is brittle
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Solution
A linear relationship in the stress-strain curve indicates that the material behaves elastically within that range.
Correct Answer:
A
— The material is elastic
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Q. In a tensile test, if the stress-strain curve shows a linear relationship, what does this indicate about the material?
A.
It is inelastic
B.
It is elastic
C.
It has reached its yield point
D.
It will break immediately
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Solution
A linear relationship in the stress-strain curve indicates that the material behaves elastically within that range.
Correct Answer:
B
— It is elastic
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Q. In a test cross, an individual of unknown genotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
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Solution
A test cross is performed by crossing an individual of unknown genotype with a homozygous recessive individual.
Correct Answer:
C
— Homozygous recessive
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Q. In a test cross, an individual with a dominant phenotype is crossed with which of the following? (2021)
A.
Homozygous dominant
B.
Homozygous recessive
C.
Heterozygous
D.
None of the above
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Solution
In a test cross, an individual with a dominant phenotype is crossed with a homozygous recessive individual to determine its genotype.
Correct Answer:
B
— Homozygous recessive
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Q. In a test cross, an individual with an unknown genotype is crossed with which of the following? (2023)
A.
Homozygous dominant
B.
Heterozygous
C.
Homozygous recessive
D.
Any individual
Show solution
Solution
In a test cross, the individual with an unknown genotype is crossed with a homozygous recessive individual.
Correct Answer:
C
— Homozygous recessive
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Q. In a test, the scores of 12 students are: 10, 10, 20, 20, 20, 30, 30, 40, 50, 50, 50, 60. What is the mode?
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Solution
The mode is 50, as it appears most frequently (3 times) in the scores.
Correct Answer:
D
— 50
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Q. In a thermodynamic cycle, if the net work done by the system is 200 J and the heat absorbed is 300 J, what is the change in internal energy?
A.
100 J
B.
200 J
C.
300 J
D.
500 J
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Solution
According to the First Law of Thermodynamics, ΔU = Q - W. Here, ΔU = 300 J - 200 J = 100 J.
Correct Answer:
A
— 100 J
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Q. In a thermodynamic cycle, the net work done is equal to the:
A.
Net heat added to the system
B.
Net heat removed from the system
C.
Change in internal energy
D.
Change in entropy
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Solution
In a thermodynamic cycle, the net work done is equal to the net heat added to the system, according to the first law of thermodynamics.
Correct Answer:
A
— Net heat added to the system
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Q. In a thermodynamic cycle, the net work done is equal to which of the following?
A.
Net heat added to the system
B.
Net heat rejected by the system
C.
Change in internal energy
D.
Change in enthalpy
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Solution
In a thermodynamic cycle, the net work done is equal to the net heat added to the system, according to the first law of thermodynamics.
Correct Answer:
A
— Net heat added to the system
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Q. In a thermodynamic cycle, the net work done is equal to:
A.
Net heat added to the system
B.
Net change in internal energy
C.
Net heat removed from the system
D.
None of the above
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Solution
In a thermodynamic cycle, the net work done is equal to the net heat added to the system, as the internal energy change is zero.
Correct Answer:
A
— Net heat added to the system
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Q. In a thermodynamic process, if the internal energy of a system increases, which of the following could be true?
A.
Heat is added to the system
B.
Work is done by the system
C.
Both heat is added and work is done by the system
D.
Work is done on the system
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Solution
The internal energy of a system increases if heat is added to the system or work is done on the system.
Correct Answer:
A
— Heat is added to the system
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Q. In a thermodynamic process, if the pressure of a gas is held constant and the volume decreases, what happens to the temperature?
A.
It increases
B.
It decreases
C.
It remains constant
D.
It becomes negative
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Solution
According to Gay-Lussac's Law, if the volume decreases at constant pressure, the temperature must increase.
Correct Answer:
B
— It decreases
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Q. In a thermodynamic process, if the volume of a gas is doubled while keeping the temperature constant, what happens to the pressure?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
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Solution
According to Boyle's Law, for a constant temperature, pressure is inversely proportional to volume. If volume doubles, pressure halves.
Correct Answer:
B
— It halves
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Q. In a thin film interference experiment, what type of interference occurs when light reflects off a denser medium? (2023)
A.
Constructive interference
B.
Destructive interference
C.
No interference
D.
Total internal reflection
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Solution
When light reflects off a denser medium, a phase change of π occurs, leading to destructive interference for certain path differences.
Correct Answer:
B
— Destructive interference
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Q. In a thin film interference pattern, what happens to the colors observed as the angle of incidence increases?
A.
Colors become more vivid
B.
Colors disappear
C.
Colors shift
D.
Colors remain unchanged
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Solution
As the angle of incidence increases, the effective path difference changes, causing a shift in the observed colors.
Correct Answer:
C
— Colors shift
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Q. In a thin film interference, if the film is denser than the medium it is placed in, what happens to the phase of the reflected wave?
A.
No phase change
B.
Phase change of π
C.
Phase change of 2π
D.
Phase change of π/2
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Solution
When light reflects off a denser medium, it undergoes a phase change of π (180 degrees).
Correct Answer:
B
— Phase change of π
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Q. In a thin film interference, if the film is of thickness t and the refractive index is n, what is the condition for the first dark fringe?
A.
2nt = (m + 1/2)λ
B.
2nt = mλ
C.
2nt = (m - 1/2)λ
D.
2nt = 0
Show solution
Solution
For the first dark fringe in thin film interference, the condition is 2nt = (m + 1/2)λ, where m = 0.
Correct Answer:
A
— 2nt = (m + 1/2)λ
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Q. In a thin film interference, if the film is of thickness t and the refractive index is n, what is the condition for constructive interference?
A.
2nt = (m + 1/2)λ
B.
2nt = mλ
C.
2nt = (m - 1/2)λ
D.
2nt = mλ/2
Show solution
Solution
For constructive interference in thin films, the condition is 2nt = mλ, where m is an integer.
Correct Answer:
B
— 2nt = mλ
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Q. In a thin film interference, if the film is of thickness t and the wavelength of light is λ, what is the condition for destructive interference?
A.
2t = (m + 1/2)λ
B.
2t = mλ
C.
t = mλ
D.
t = (m + 1/2)λ
Show solution
Solution
Destructive interference occurs when 2t = (m + 1/2)λ, where m is an integer.
Correct Answer:
A
— 2t = (m + 1/2)λ
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Q. In a thin film interference, if the film is viewed in white light, which color will appear at the center of the pattern?
A.
Red
B.
Blue
C.
Green
D.
Yellow
Show solution
Solution
Red light has the longest wavelength and will appear at the center of the interference pattern.
Correct Answer:
A
— Red
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Q. In a thin film interference, if the film is viewed in white light, which color will be seen at the center of the film? (2022)
A.
Red
B.
Blue
C.
Green
D.
Yellow
Show solution
Solution
At the center of a thin film, constructive interference occurs for longer wavelengths (red light), making red the dominant color seen.
Correct Answer:
A
— Red
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Q. In a thin film interference, what causes the colors seen in soap bubbles?
A.
Reflection and refraction
B.
Diffraction
C.
Scattering
D.
Absorption
Show solution
Solution
The colors in soap bubbles are due to thin film interference caused by the reflection and refraction of light at the film's surfaces.
Correct Answer:
A
— Reflection and refraction
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Q. In a thin film interference, what type of interference occurs when light reflects off a medium with a higher refractive index?
A.
Constructive
B.
Destructive
C.
No interference
D.
Total internal reflection
Show solution
Solution
When light reflects off a medium with a higher refractive index, a phase change of π occurs, leading to destructive interference.
Correct Answer:
B
— Destructive
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Q. In a thin film interference, which of the following conditions leads to a dark fringe?
A.
Path difference is an even multiple of lambda
B.
Path difference is an odd multiple of lambda
C.
Path difference is zero
D.
Path difference is an odd multiple of lambda/2
Show solution
Solution
A dark fringe occurs when the path difference is an odd multiple of the wavelength (λ/2), leading to destructive interference.
Correct Answer:
B
— Path difference is an odd multiple of lambda
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Q. In a thin film interference, which of the following conditions leads to destructive interference?
A.
2t = (m + 1/2)λ
B.
2t = mλ
C.
t = mλ/2
D.
t = (m + 1/2)λ/2
Show solution
Solution
Destructive interference in thin films occurs when the effective path difference is an odd multiple of half the wavelength, given by 2t = (m + 1/2)λ.
Correct Answer:
A
— 2t = (m + 1/2)λ
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Q. In a thin film of air between two glass plates, which of the following colors will be least affected by interference? (2022)
A.
Red
B.
Green
C.
Blue
D.
Violet
Show solution
Solution
Red light has the longest wavelength and is least affected by interference effects in thin films compared to shorter wavelengths.
Correct Answer:
A
— Red
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Q. In a thin film of oil on water, if the thickness of the film is 0.1 mm and the wavelength of light in air is 600 nm, what is the condition for constructive interference?
A.
2t = (m + 0.5)λ
B.
2t = mλ
C.
2t = (m + 1)λ
D.
2t = mλ/2
Show solution
Solution
For constructive interference in a thin film with a denser medium below, the condition is 2t = mλ.
Correct Answer:
B
— 2t = mλ
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Q. In a thin film of oil on water, if the thickness of the film is 200 nm and the refractive index of oil is 1.5, what is the wavelength of light in the film?
A.
400 nm
B.
600 nm
C.
800 nm
D.
1000 nm
Show solution
Solution
Wavelength in the film λ' = λ/n. If λ = 900 nm, then λ' = 900 nm / 1.5 = 600 nm.
Correct Answer:
B
— 600 nm
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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!