ENVIRONMENT BASICS PREVIOUS PAPER SET-12 FOR RRB JE/CMA CBT-2

Added: 2026-05-27

[00:00:00]So we were looking at the previous year questions of Environment Basics and rest, we have made a separate playlist of all the previous year questions that we have conducted, so you can watch all the previous videos and see, your examination which is going to be CBT 2, for this we have launched a complete course, in this you will get complete topic wise lectures of Computer, Environment, Physics, Chemistry and General Awareness, along with this you will also get the PDF, so this is an app available label. You guys should download the app.

[00:00:30]Along with this, if you want to take only a course in Computer Environment then you can also do this.

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[00:00:55]Look, we have prepared complete books for you on computer, environment, chemistry, physics or your general awareness.

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[00:01:08]We have made all the facilities available to you. So you will find the links of all these in the description box.

[00:01:13]So let us come to our question series. This is set number 12. For all the rest that have happened, we have created a separate playlist for all of them. So you guys can go to YouTube and watch it. So look at the question, Ecology is the study of relationships, so Ecology which is called in Hindi as Ecology, so this is like a relationship between whom do we study, actually, so look at Ecology, if we talk about Ecology here, then Ecology is our environment and the organisms that live in it, the relationship that exists between these two, that is what is studied within Ecology, so look at this, Option A is the correct answer here because see, in our environment, there will be organisms and in what ways do they affect each other.

[00:02:05]So this is your ecology. Rest, here you will see that man and environment, there is environment but in environment, is it only man who means there are such creatures who live there. There are many other creatures as well. So this will not be yours. Rest, there will be no husband or wife. There will be no soil and water either.

[00:02:22]So, ecology is the study of all these organisms and their relationship with the environment, we call it ecology and see what ecology is and all the important things related to ecology, you will get all of them in the PDF and all the things related to it which you have to understand, we have explained them all very well in the lectures, you will get complete clarity in the course which we have developed.

[00:02:45]In this, the question is asked who is called the Father of Indian Ecology, it is Professor R Mishra, so this is very important, so this is actually a study of biology, here it is done in which the way the organism and the environment are interconnected is studied, actually in this you will get biotic and abiotic, that is, living and non-living things, their components which are present in the environment, all of them are studied in it and see the rest related to it, like if you get a question related to ecosystem, then you will find all these things in it. See next question here is who is the father of Indian ecology? So, if we talk about Indian Ecology, who is its father? So now see, we had told you that Professor R Mishra is the Father of Indian Eco, he is called the father of Indian ecology. So the question that is asked is that we have given all that data. See next, it is given that the science that deals with the relationship of the various organisms with the environment is non-age, so here the definition of ecology has been simply asked, in which the relationship between various organisms and the environment is shown, so what is this called, which is called ecology, then option D will be the correct answer.

[00:04:05]Look here, we have given all the important things related to ecology.

[00:04:09]So at least if you do this much which we have given in the content then you will not miss any question, you will be able to answer it in the examination and the rest, once you get clarity on the concept which we have explained to you, if you do it well then you will not miss any question, you will answer the examination easily, ask in any way, so see the next question here is which of the following is not a cause of air pollution, so you have to tell which of these is not a cause of air pollution. So look here, acid rain, agricultural activity, burning of fossil fuels and one is your mining operations. So look here, if we talk about air pollution, what causes air pollution? What causes air pollution in us? So this is a basic thing. You guys can think of ideas. For example, look at the mining operation given here, when mining is done, it is obvious that dust is released from it. Gases are also released halfway.

[00:05:07]So this will definitely happen. So what you have here is that there is definitely a reason for it. Rest see, acid rain is given.

[00:05:14]So see, acid rain is a phenomenon in which acid comes mixed with the rain.

[00:05:21]So this will not be your cause of air pollution. Because this is already a phenomenon. So here pay to will be the right answer. Rest you can eliminate the options.

[00:05:30]Agricultural activity is given. So, see, when we do agricultural activities, it also causes air pollution. Because see, when we do agricultural activities, we burn a lot of debris. The crops that are sown.

[00:05:46]After that whatever remains are burnt.

[00:05:48]So obviously it will happen because of that.

[00:05:50]Burning of fossil fuel definitely causes air pollution. So these three meanings are here but the acid run will not be yours. It must be due to air pollution, it is not because of what is happening here. So look at all this, if you have clarity on all the topics then you will be able to complete it.

[00:06:06]We have explained all this very well that what is acid rain, actually, your acid rain, like this rain, if it becomes acidic in nature, that is, if some such acids come along with it and if it is there then it causes damage, like it causes damage to buildings and it causes damage to all the aquatic animals, so how does it happen and what are the reasons behind it, which are the gases, so you will get all this in full detail here.

[00:06:36]In this, for example, the pH of normal rain water is 5.6 and you know that the acids present in it, if it goes below seven, the lower the pH, the more acidic it will be in nature.

[00:06:49]So the PA of rain water or normal rain water is 5.6.

[00:06:54]But if the pH value of rain water falls below 5.6, then its nature becomes acidic. So this is what we call the rain that is happening now, it is acid rain. So what causes this? What are the reasons behind this? So we have explained all these things very well. You guys can go and see this topic regarding this. Mainly this happens due to the oxides of sulphur and nitrogen.

[00:07:17]In which your first acid is H2SO4 and the second one is HNO3, so you will get all the reasons behind it in complete detail. Next, here is the question that was asked: Increase in the carbon dioxide in the atmosphere is caused by the following reasons. Now look, if we talk about carbon dioxide, there is talk of its increase, its increase in the atmosphere, then what is the reason behind this? Which Reese could have caused this? So look at the options given here, the first one is given for you, in this, excess use of the fossil tools. So, it is obvious that if we use excess fuels, then carbon dioxide will definitely increase.

[00:08:01]So this is one of your reasons.

[00:08:04]Next look, deforestation is speaking. See, deforestation means that if we deforest the forest that is there now, that is, if we cut it, then obviously the number of trees will decrease and you know that a tree absorbs carbon dioxide. So obviously there will be less to absorb.

[00:08:23]So obviously the carbon dioxide concentration will increase.

[00:08:27]So this is also one of your reasons that it can increase. Then see next, it is given that increase in the number of vehicles means the number of vehicles is also increasing, so obviously their emissions also cause this. So in a way this is also a region. So 1 2 3 will be yours too. Look at the remaining four, it is given that excess use of solar heaters.

[00:08:49]So, if we use solar heater excessively, then your carbon dioxide does not increase because solar heater is environmentally friendly, no carbon dioxide is released from it, so this cannot be the reason for their increase, so here, except four, all the rest 1, 2, 3 will be your right answer, so see, it is given that your 1 and 2 will not be 1, 2 and 4, it will not be 1, 2 and 3, so this will be the right answer, see, here 1, 2, 3 will be there but not four. So look at all this, if your clarity is on the topics like how what phenomenon happens and what effects can be related to it, then you will be able to answer the question easily. You will not have any problem.

[00:09:30]So, regarding the rest of this, you will get complete data related to all this.

[00:09:34]Next look, your question is when did the Kyoto Climate Change Conference take place.

[00:09:39]So, it has been asked when the Kyoto Climate Change Conference took place.

[00:09:43]So look, Kyoto, you mean, basically it is a city in Japan, it is known by the name of Kyoto Protocol.

[00:09:51]So this was adopted in Kyoto city and this was done on 11 December 1997. So what is here, this was given by you here, when did it happen? So this is your 1997 in December 1997, this will be its right answer.

[00:10:08]But see, whatever steps were taken related to this, actually it came into force in February 2005, so here you have to see what has been asked related to this, that when did this happen, this meeting of yours took place in 1997, December 1997, but whatever results related to this, that is, when did the measures that were going to be taken come into force, this is 2005, it came in February 2005, so you have to remember this because this is the question that was asked in this, Equido Protocol was entered into force in the year.

[00:10:40]So when did this happen? in 2005. So its option A will be correct. So with regard to all this, we have given it in full detail.

[00:10:48]Like there is the Kato Protocol, there is the Montreal Protocol. Apart from this, there is Veena Convention and many other things like Gaali Agreement, we have given all that data.

[00:10:59]So, the protocol was an international treaty in which all this, that is, the meeting, was held in 1997 and your force came in 2005. So, all these objectives that were implemented in this were that how can we reduce the greenhouse gases, that is, the gases due to which global warming is taking place. So, the greenhouse gases due to which global warming is taking place, all of them were applied in this, that is, all these gases should be tackled in such a way that the warming of our environment can be reduced. So, you will have to remember all these things like carbon dioxide has become nitrous oxide, so all these are important things, you should see them from the exam point of view. Next look, here is your question which was asked here that the aquatic animals can breathe underwater due to the presence of dissolved dust in water. Look, the aquatic animals that live inside the water are able to breathe, so do they dissolve in the water? So see, there is dissolved oxygen inside the water.

[00:12:03]So because of this, the aquatic animals are able to breathe. So the dissolve happens due to the presence of oxygen. So look at this, option A will be yours. See next given that dash is the process of overgrowth of plants and algae in the legs. So what has been asked here is what is this process in which the plants and algae that are present inside the legs get overgrown. So see, this process is called atropination.

[00:12:30]So this is option A, your correct answer will be here. So this is a process in which you will see this deposited in the green colored pond or lakes. So what happens is that they overgrow and what is the reason behind this? So, like the agricultural lands, the fertilizers from them flow into these lakes.

[00:12:52]Due to which algae overgrowth occurs. So let's call this process, you will get all this in full detail, all of this is given here, your complete information regarding all this and the rest related to all this, how does it cause harm or what is its effect, so see, we have explained all this inside the PDF, so see, the session will continue in this way, the rest you people keep preparing in your own way, we will keep preparing you in this way till the examination and the rest see, the course which we have provided you, it will be very important from the exam preparation view, so you people can enroll in it, you people can go to the app, from there you can buy the course and do your preparation and see the rest, the link of all the PDFs which we have given in the description box, so you people can go there and buy the PDF and you people can prepare well.