Careers360 Logo
NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem

NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem

Edited By Irshad Anwar | Updated on Sep 18, 2023 07:53 PM IST | #CBSE Class 12th

NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem: Earlier, you learned that a cell is a structural and functional unit of life, so similarly, an ecosystem is a structural and functional unit of nature and comprises both abiotic and biotic components. Solutions to NCERT Class 12 Biology Chapter 14 will make you understand the questions that have been asked from this chapter in the NCERT Textbook and will provide answers for the same. In Ecosystem NCERT Solutions, you will learn that abiotic components are inorganic materials such as air, water, and soil, whereas biotic components are producers, consumers, and decomposers. These NCERT Solutions for Class 12 can be used by students to get ready for their board exams as they are prepared by subject matter experts. Furthermore, these solutions are available for free download in PDF format. Scroll down to go through the questions and answers given in NCERT Solutions for Class 12 Biology Chapter 14.

Ecosystem Class 12 NCERT Solutions explain different types of ecosystems, and each of the ecosystems has a characteristic that results from the interaction between abiotic and biotic components. Also, there are two main structural features of an ecosystem: species composition and stratification. According to Ecosystem NCERT Solutions, based on the source of nutrition, every organism occupies a place in an ecosystem. Class 12 Biology Chapter 14 is curated according to the latest CBSE Syllabus for 2023–24. These Class 12 Biology NCERT Solutions will help students score well in the exams. Ecosystem Class 12 Solutions provide explanations in detail with related and representative examples.

Apply to Aakash iACST Scholarship Test 2024

Applications for Admissions are open.

Chapter 14 Biology Class 12 is beneficial to enhance the conceptual knowledge of students. Class 12 Biology Chapter 14 question answer will also help you understand the concepts and topics for the competitive exams as well. If you are looking for the answers to any other class from 6–12, then NCERT Solutions are there for you, as it's the easiest way to get all the Ecosystem NCERT Solutions. As well, Ecosystem Class 12 NCERT PDF can be downloaded.

ALLEN Digital Scholarship Admission Test (ADSAT)

Register FREE for ALLEN Digital Scholarship Admission Test (ADSAT)

Aakash iACST Scholarship Test 2024

Get up to 90% scholarship on NEET, JEE & Foundation courses

NCERT Solutions For Class 12 Biology Ecosystem

According to the latest CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 12.

Download PDF

Also Read: NCERT Exemplar for Class 12 Biology Chapter 14 Ecosystem

NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem

Ecosystem NCERT Solutions are given below in the sequence as per NCERT Textbook data:

Class 12 Biology Chapter 14 NCERT Solutions:

Q1. Fill in the blanks.

(a) Plants are called as_________because they fix carbon dioxide.

Answer:

Plants are called as autotrophs because they fix carbon dioxide.

Q1. Fill in the blanks.

(b) In an ecosystem dominated by trees, the pyramid (of numbers) is_________type.

Answer:

In an ecosystem dominated by trees, the pyramid (of numbers) is inverted type.

Q1. Fill in the blanks.

(c) In aquatic ecosystems, the limiting factor for the productivity is_________.

Answer:

In aquatic ecosystems, the limiting factor for productivity is light .

Q1 . Fill in the blanks.

(d) Common detritivores in our ecosystem are_________.

Answer:

Common detritivores in our ecosystem are earthworms

Q1. Fill in the blanks.

(e) The major reservoir of carbon on earth is_________.

Answer:

The major reservoir of carbon on earth is ocean.

Class 12 Biology Chapter 14 NCERT Solutions

Q2 . Which one of the following has the largest population in a food chain?

(a) Producers

(b) Primary consumers

(c) Secondary consumers

(d) Decomposers

Answer:

(d) Decomposers

Decomposers are microorganisms including fungi and bacteria. These break down the remains of dead plants and animals. Decomposers form the largest community of organisms in a food chain.

Ecosystem Class 12 Solutions

Q3. The second trophic level in a lake is

(a) Phytoplankton

(b) Zooplankton

(c) Benthos

(d) Fishes

Answer:

(b) Zooplankton

In a lake, the first trophic level is formed by phytoplankton while the second trophic level is formed by zooplankton.

Ecosystem Class 12 NCERT Solutions

Q4. Secondary producers are:

(a) Herbivores

(b) Producers

(c) Carnivores

(d) None of the above

Answer:

(d) None of the above

In a food chain, plants are the only producers, there are no other producers. Herbivores and carnivores are primary and secondary consumers respectively.

Ecosystem Class 12 Solutions:

Q5. What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation?

(a) 100%

(b) 50 %

(c) 1-5%

(d) 2-10%

Answer:

(b) 50%

Out of total incident solar radiation, 50 % is formed by photosynthetically active radiation

Ecosystem Class 12 NCERT Solutions:

Q6. Distinguish between

(a) Grazing food chain and detritus food chai

Answer:

Grazing food chain Detritus food chain
Solar energy is utilised Biomass energy stored in bodies of plants and animals is utilised
The grazing food chain starts from producers The detritus food chain starts from detritus i.e. dead plants and animals
It includes a number of trophic levels Detritus food chain includes a lesser number of trophic levels

NCERT Solutions For Class 12 Biology Ecosystem:

Q6. Distinguish between

(b) Production and decomposition

Answer:

Production Decomposition
It is the process of formation of organic matter by producers by means of photosynthesis It is the process of breakdown of complex organic matter into simples organic molecules
It requires sunlight It can take place in the absence of sunlight also


Class 12 Biology Chapter 14 NCERT Solutions

Q6. Distinguish between

(c) Upright and inverted pyramid

Answer:

Upright pyramid Inverted pyramid
Upright pyramids show a decrease in number and biomass from producer level to the tertiary consumer level Inverted pyramids depict an increase in number and biomass from producer level to tertiary consumer level
Pyramid of energy is upright Pyramid of biomass and number can be inverted

Class 12 Biology Chapter 14 Question Answer:

Q6. Distinguish between

(d) Food chain and Food web

Answer:

Food chain Food web
A series of living organisms present at different trophic levels and related to food habits An interconnected web of a number of food chains.
The members at higher trophic level feed upon the members of lower trophic levels. Different organisms have more than one food sources


Class 12 Biology Chapter 14 NCERT Solutions:

Q6. Distinguish between.

(e) Litter and detritus

Answer:

Litter Detritus
The term litter refers to any kind of waste generated The term detritus refers to the dead waste of plants and animals bodies
Litter can be biodegradable as well as non- biodegradable Detritus is biodegradable


Class 12 Ecosystem NCERT Solutions:

Q6. Distinguish between.
(f) Primary and secondary productivity

Answer:

Primary productivity Secondary productivity
Primary productivity refers to the amount of organic matter produced by producers per unit area over a period of time Secondary productivity refers to the rate of production of organic matter by consumers over a period of time

Class 12 Ecosystem NCERT Solutions

Q7. Describe the components of an ecosystem.

Answer:

An ecosystem refers to be the functional unit of nature in which living organisms interact among themselves and also with their surrounding physical environment in order to perform nutrient cycling, energy flow, decomposition and productivity. There are many types of ecosystems such as pond ecosystem, forest ecosystem etc.

Components of ecosystem

The components of the ecosystem can be divided into abiotic components and biotic components

1. Abiotic components- These include the non-living components of nature such as light, temperature, water, soil, air, inorganic nutrients etc.

2. Biotic components- The biotic components of an ecosystem refer to the living organisms present in that ecosystem. The biotic components are divided as producers, consumers and decomposers. Producers are plants, consumers include animals which can be herbivores or carnivores and decomposers include microorganisms like fungi and bacteria.

Ecosystem Class 12 Questions and Answers

Q8. Define ecological pyramids and describe with examples, pyramids of number and biomass.

Answer:

Ecological pyramid- The graphical representation of an ecological parameter such as number, biomass or energy, sequence wise in various trophic levels of a food chain in which producers are at the base, herbivores in the middle and carnivores at the top level. Ecological pyramids can be upright, inverted, or spindle-shaped. The three common types of ecological pyramids include the pyramid of number, pyramid of biomass and pyramid of energy.

1. Pyramids of number- It is the number of individuals per unit area at various trophic levels. It is generally upright, however, the pyramid of number in case of a big tree is generally inverted because number of insects that feed on tree generally exceeds in number.

2. Pyramids of biomass- It represents the biomass in various trophic levels. A pyramid of biomass is upright except in an aquatic food chain. A pyramid of biomass in the sea is generally inverted because the biomass of fishes is generally more than that of phytoplankton.

3. Pyramids of energy- It is the graphic representation of the amount of energy trapped at different trophic levels per unit area. Pyramid of energy is always upright.

Ecosystem Class 12 Questions and Answers:

Q9. What is primary productivity? Give brief description of factors that affect primary productivity.

Answer:

Primary productivity refers to the amount of organic matter or biomass produced by producers per unit area over a period of time. The primary productivity of an ecosystem depends upon a number of factors such as light, temperature, water, precipitation, availability of nutrients etc.

Class 12 Biology Ch 14 Question Answer

Q10. Define decomposition and describe the processes and products of decomposition.

Answer:

Decomposition is the process of breaking down of complex organic matter of detritus into inorganic substances such as carbon dioxide, water and nutrients. Dead remains of plants and animals constitute detritus. The process of decomposition involves steps like fragmentation, leaching, catabolism, humification and mineralization.

1. Fragmentation of Detritus- In this step, the detritus is broken down into small fragments by earthworms

2. Leaching- In leaching the water-soluble nutrients, seep down into the soil and become unavailable salts.

3. Catabolism- The small fragments of decomposed by decomposers like fungi and bacteria with the help of action of enzymes.

4. Humification- In this step, humus is formed. Humus is a dark coloured, amorphous solid substance that acts as a nutrient reserve.

5. Mineralization- In this step by the action of microbes, the inorganic nutrients are released from the humus.

Class 12 Biology Ch 14 Question Answer:

Q11. Give an account of energy flow in an ecosystem

Answer:

Energy Flow in an ecosystem:

All living organisms are dependent for their food on producers, directly or indirectly. There is a unidirectional flow of energy from the sun to producers and then to consumers. Photosynthetically active radiation (PAR) is responsible for the synthesis of food by plants. Animals obtain their food from plants, so they are called consumers. The process of eating and being eaten is called a food chain in which energy flows from producers to consumers. For example, in Grazing food chain, the grass is eaten by goats which are further eaten by man. Similarly, in the detritus food chain, the sequence begins with dead organic matter. It is made up of decomposers which are heterotrophic organisms (fungi and bacteria). These are also known as saprotrophs. Decomposers secrete digestive enzymes that breakdown dead and waste materials into simple, inorganic materials, which are subsequently absorbed by them. Natural interconnection of food chain forms the food web. Thus, in an ecosystem, energy flow occurs through food chains and food webs.

Ecosystem NCERT Solutions

Q12. Write important features of a sedimentary cycle in an ecosystem.

Answer:

The important features of the sedimentary cycle are as follows:

1. These nutrient cycles have their reservoirs in the Earth's crust.

2. Sulphur, calcium, phosphorous etc have sedimentary cycles.

3. Sedimentary cycles are slow, they take more time to complete their circulation and are considered less perfect cycles

Class 12 Biology Chapter 14 Question Answer

Q13. Outline salient features of carbon cycling in an ecosystem.

Answer:

Salient features of carbon cycling are as follows

1. Carbon cycling occurs through atmosphere, ocean and through the living and dead organisms.

2. Most of the carbon is fixed by plants during the process of photosynthesis and returns to the atmosphere in the form of CO2 during respiration.

3. Burning of wood, forest fire and combustion of organic matter, fossil fuel, and volcanic activity are some other sources of releasing CO2 in the atmosphere.

An outline of C-cycle is depicted in the figure given below:

1650516132634

NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem

Ecosystem NCERT Solutions explain about different communities of an ecosystem. The biotic community is dynamic and undergo changes with the passage of time. These changes are sequentially ordered and constitute ecological succession and in the Ecosystem NCERT PDF, you will get all the solutions related to this topic. Succession begins with the invasion of a bare lifeless area by pioneers which later pave way for successors and ultimately a stable climax community is formed, as given in Ch 14 Biology Class 12. The climax community remains stable as long as the environment remains unchanged. We have thorough solutions to every chapter of the NCERT Solutions for Class 12 Biology, which have been updated to the CBSE Syllabus 2023-24.

After going through the ecosystem NCERT, you must be able to answer the questions: common detritivores in our ecosystem are?

Four important components of an ecosystem are:

  1. Productivity
  2. Decomposition
  3. Energy Flow
  4. Nutrient Cycling
NEET Highest Scoring Chapters & Topics
Most Scoring concepts For NEET (Based On Previous Year Analysis)
Download EBook

Primary productivity is the rate of capture of solar energy or biomass production of the producers. According to the Biology Chapter 14 Class 12, it is divided into two types:

  • Gross primary productivity (GPP)
  • Net primary productivity (NPP)
PACE IIT & Medical, Financial District, Hyd

Enrol in PACE IIT & Medical, Financial District, Hyd for JEE/NEET preparation

ALLEN NEET Coaching

Ace your NEET preparation with ALLEN Online Programs

NCERT Biology Class 12 defines that nutrient cycling is of two types and these are:

  • Gaseous
  • Sedimentary

you will learn more in Biology Chapter 14 Class 12. If you have any problem in finding the answers to the above questions, then NCERT Solutions for Class 12 Biology Chapter 14: Ecosystem, will help you out.

Try to do all the questions mentioned in CBSE NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem by yourself, because NCERT is the base of your studies and base should always be clear. If you have any doubt or unable to do by yourself then Solutions for NCERT Class 12 Biology Chapter 14 Ecosystem will help you in a very good way, so that you can score good marks not only in 12th Biology board exam as well as also in other competitive exams like NEET.

Important Topics of NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem:

The important topics of Ecosystem Class 12 NCERT Solutions are mentioned below:

Section Name
Topic Name
14
Ecosystem
14.1Ecosystem–Structure and Function
14.2Productivity
14.3Decomposition
14.4Energy Flow
14.5Ecological Pyramids
14.6Ecological Succession
14.7Nutrient Cycling
14.8Ecosystem Services
14.9Summary

Dropped Topics of Ecosystem NCERT Solutions Class 12:

  • 14.6 - Ecological Succession,
  • 14.6.1 - Succession of Plants,
  • 14.7 - Nutrient Cycling,
  • 14.7.1 - Ecosystem – Carbon Cycle,
  • 14.7.2 - Ecosystem – Phosphorus Cycle,
  • 14.8 - Ecosystem Services.

And if you still have any doubts or problems getting the correct answers, then the Ecosystem NCERT PDF will help you. But don't forget to try Ecosystem NCERT Questions at least once so that you can answer those questions by yourself and then check your answers with the help of Ecosystem Class 12 NCERT Solutions.

Highlights of NCERT Solutions Class 12 Biology Chapter 14 – Ecosystem

The key features of CBSE NCERT Solutions for Class 12 Biology Chapter 14 ecosystem are given below:

  • Ecosystem Class 12 NCERT Solutions are written in the best possible way using simple language that makes solutions easier to read and understand
  • In Biology Chapter 14 Class 12 Solutions, points are used to frame answers to help understand quickly.
  • Solutions content for Ecosystem Class 12 NCERT is derived from the textbook by the subject expert.
  • Solutions for Class 12 Biology Chapter 14 are as per the latest CBSE Syllabus and guidelines.
  • Ecosystem Class 12 NCERT PDF links are readily available and easily accessible for free.
  • Important topics are listed in the NCERT solutions for Class 12 biology chapter 14.
  • Ecosystem NCERT will also help you to prepare for your competitive exams like NEET
  • Solutions for Class 12 Biology Chapter 14 Ecosystem NCERT will also help you in your 12th board exam.

NCERT Exemplar Class 12 Solutions

Also Check NCERT Books and NCERT Syllabus here:

NCERT Solutions for Class 12 Biology: Chapter wise

NCERT Solutions for Class 12- Subject wise


We hope you will ace your board examination with the help of NCERT Solutions for Class 12 Biology Chapter 14 Ecosystem.

Frequently Asked Question (FAQs)

1. What are the four important components of an ecosystem given in ecosystem ncert?
  • Four important components of an ecosystem given in ecosystem ncert are:   
  1.    Productivity   

  2.    Decomposition   

  3.    Energy Flow   

  4.    Nutrient Cycling 

2. What are the important topics of solutions for ecosystem ncert pdf?

The important topics of ecosystem NCERT are:

  • Ecosystem–Structure and Function   
  • Productivity   
  • Decomposition   
  • Energy Flow   
  • Ecological Pyramids   
  • Ecological Succession   
  • Succession of Plants   
  • Nutrient Cycling   
  • Ecosystem – Carbon Cycle   
  • Ecosystem – Phosphorus Cycle   
  • Ecosystem Services  
3. What are the benefits of ecosystem ncert pdf?
  • NCERT is the base of your learning.   
  • You will get all the answers to ecosystem ncert and it will help you to score good marks in the exam.   
  • Ecosystem ncert pdf will also help you with competitive exams like NEET.   
  • NCERT solutions for class 12 biology chapter 14 ecosystem NCERT will also help you in your 12th board exam.  Ecosystem NCERT will also boost your knowledge.  
  • To score well in the examination, follow the NCERT syllabus and solve the exercise given in the NCERT Book. To practice more problems, students must refer to NCERT Exemplar.
4. what are the components of ecosystm given in NCERT Solutions for Class 12 Biology Chapter 14 ?

The components of the ecosystem NCERT can be divided into abiotic components and biotic components:

  1. Abiotic components- These include the non-living components of nature such as light, temperature, water, soil, air, inorganic nutrients etc.  

  2. Biotic components- The biotic components of an ecosystem refer to the living organisms present in that ecosystem. The biotic components are divided as producers, consumers and decomposers. Producers are plants, consumers include animals which can be herbivores or carnivores and decomposers include microorganisms like fungi and bacteria.

5. Can students rely on the careers360 NCERT Solutions for Class 12 Biology Chapter 14?

The NCERT Solutions for Class 12 Biology Chapter 14 are created with the primary goal of assisting students in concentrating on crucial ideas. To improve students' conceptual understanding, every last detail is carefully explained. The solutions also include a number of shortcuts that can be used to effectively remember the concepts. In order to answer the questions from the textbook, students can consult the solutions, and they will have no trouble understanding how to do so.

Articles

Explore Top Universities Across Globe

University of Essex, Colchester
 Wivenhoe Park Colchester CO4 3SQ
University College London, London
 Gower Street, London, WC1E 6BT
The University of Edinburgh, Edinburgh
 Old College, South Bridge, Edinburgh, Post Code EH8 9YL
University of Bristol, Bristol
 Beacon House, Queens Road, Bristol, BS8 1QU
University of Nottingham, Nottingham
 University Park, Nottingham NG7 2RD
Lancaster University, Lancaster
 Bailrigg, Lancaster LA1 4YW

Questions related to CBSE Class 12th

Have a question related to CBSE Class 12th ?

Here are some options you can explore to get admission in a good school even though admissions might be closed for many:

  • Waitlist: Many schools maintain waitlists after their initial application rounds close.  If a student who secured a seat decides not to join, the school might reach out to students on the waitlist.  So, even if the application deadline has passed,  it might be worth inquiring with schools you're interested in if they have a waitlist and if they would consider adding you to it.

  • Schools with ongoing admissions: Some schools, due to transfers or other reasons, might still have seats available even after the main admission rush.  Reach out to the schools directly to see if they have any open seats in 10th grade.

  • Consider other good schools: There might be other schools in your area that have a good reputation but weren't on your initial list. Research these schools and see if they have any seats available.

  • Focus on excelling in your current school: If you can't find a new school this year, focus on doing well in your current school. Maintain good grades and get involved in extracurricular activities. This will strengthen your application for next year if you decide to try transferring again.


Best CBSE schools in Delhi: Click Here


In India, the design and coding fields offer exciting career options that can leverage your interest in both. Here's how you can navigate this path:

Choosing Your Stream:

  • Graphic Design Focus: Consider a Bachelor's degree in Graphic Design or a design diploma. Build a strong portfolio showcasing your creative skills. Learn the basics of HTML, CSS, and JavaScript to understand web development better. Many online resources and bootcamps offer these introductory courses.

  • Coding Focus: Pursue a Computer Science degree or a coding bootcamp in India. These programs are intensive but can equip you with strong coding skills quickly. While building your coding prowess, take online courses in graphic design principles and UI/UX design.

Engineering Subjects (for a Degree):

  • Information Technology (IT): This offers a good mix of web development, networking, and database management, all valuable for web design/development roles.

  • Human-Computer Interaction (HCI): This is a specialized field that bridges the gap between design and computer science, focusing on how users interact with technology. It's a perfect choice if you're interested in both aspects.

  • Passing NIOS in October 2024 will make you eligible for NIT admissions in 2025 . NIT admissions are based on your performance in entrance exams like JEE Main, which typically happen in January and April. These exams consider the previous year's Class 12th board results (or equivalent exams like NIOS).

Here's why 2025 is more likely:

  • JEE Main 2024 Admissions: The application process for NITs through JEE Main 2024 is likely complete by now (May 2024). They consider your 2023 Class 12th marks (CBSE in this case).
  • NIOS Results: Since NIOS results typically come out after the NIT admission process, your October 2024 NIOS marks wouldn't be available for JEE Main 2024.

Looking Ahead (2025 Admissions):

  • Focus on JEE Main: Since you have a computer science background, focus on preparing for JEE Main 2025. This exam tests your knowledge in Physics, Chemistry, and Mathematics, crucial for engineering programs at NITs.
  • NIOS Preparation: Utilize the time between now and October 2024 to prepare for your NIOS exams.
  • Eligibility Criteria: Remember, NITs typically require a minimum of 75% marks in Class 12th (or equivalent) for general category students (65% for SC/ST). Ensure you meet this criteria in your NIOS exams.

Yes, scoring above 99.9 percentile in CAT significantly increases your chances of getting a call from IIM Bangalore,  with your academic background. Here's why:

  • High CAT Score: A score exceeding  99.9 percentile is exceptional and puts you amongst the top candidates vying for admission. IIM Bangalore prioritizes  CAT scores heavily in the shortlisting process.

  • Strong Academics: Your 96% in CBSE 12th and a B.Tech degree demonstrate a solid academic foundation, which IIM Bangalore also considers during shortlisting.

However, the shortlisting process is multifaceted:

  • Other Factors: IIM Bangalore considers other factors beyond CAT scores, such as your work experience (if any), XAT score (if you appear for it), academic diversity, gender diversity, and performance in the interview and Written Ability Test (WAT) stages (if shortlisted).

Here's what you can do to strengthen your application:

  • Focus on WAT and PI: If you receive a shortlist, prepare extensively for the Written Ability Test (WAT) and Personal Interview (PI). These stages assess your communication, soft skills, leadership potential, and suitability for the program.

  • Work Experience (if applicable): If you have work experience, highlight your achievements and how they align with your chosen IIM Bangalore program.

Overall, with a stellar CAT score and a strong academic background, you have a very good chance of getting a call from IIM Bangalore. But remember to prepare comprehensively for the other stages of the selection process.

hello,

Yes you can appear for the compartment paper again since CBSE gives three chances to a candidate to clear his/her exams so you still have two more attempts. However, you can appear for your improvement paper for all subjects but you cannot appear for the ones in which you have failed.

I hope this was helpful!

Good Luck

View All

A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

Back to top