RRB JE CE (CBT I) Mock Test- 2
100 Questions MCQ Test RRB JE Mock Test Series for Civil Engineering (CE) | RRB JE CE (CBT I) Mock Test- 2
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In a school, 1000 chocolates were distributed in such a way that each student gets chocolates equal to 10% of the total students. Find the number of chocolates that each student gets
10 x s x s/100 = 1000
s2 = 10,000 s = 100
Each student got 10 x 100/100
=> 10 chocolates
If the cost price of 12 pen is same as the selling price of 15 pen. What is the percentage of gain or loss?
=> CP/SP - 5 / 4…(1)
From equation (1) we can see that CP >SP, therefore there will be loss. Let the CP = 5 and SP = 4 Then Loss = 1
Loss% = loss/CP x 100
= 1/5 x 100
= 20% loss
The following table represents marks obtained by four students in five subjects and maximum marks of each subject.
Q. Find the respective ratio of overall percentage of marks obtained by Ankil in all the five subjects and overall percentage of marks obtained by Sulal in all the five subjects.
Overall percentage of marks obtained by Ankit in all the five subjects
= (120 + 100 + 30 + 70 + 100)/700 x 100
= 420/700 x 100
= 60%
Overall percentage of marks obtained by Sujal in all the five subjects
= (180 + 80 + 40 + 90 + 150)/700 x 100
= 540/700 x 100
= 540/7%
Required ratio = 60 : 540/7
= 420 : 540
= 7 : 9
Area of rhombus is (7 + 6.5√5) cm2 and length of its one diagonal is (3 + 2√5) cm, then what is the length of its second diagonal?
2 x Area of rhombus = (First diagonal x Second diagonal)
Let its second diagonal = (a + b√5) cm
(14 + 13√5) = (3 + 2√5) x (a + b√5)
(14 + 13√5) = (3a + 3b√5 + 2a√5 + 10b)
After comparing-
(3a + 10b) = 14 ...... (1)
(2a + 3b) = 13 ....... (2)
From (1) and (2)-
a = 8 and b = -1
Length of second diagonal = (a + b√5) = (8 - √5) cm
Solve the following expression: (∛42875 ÷ √49) + (152 - 21 x 10) - √625.
= (35 ÷ 7) + (225 - 210) - 25
= 5 + 15 - 25
= -5
A set of 7 pipes can fill 70% of a vessel in 7 minutes. Another set of 5 pipes can fill 2/5th of the vessel in 5 minutes. A third set of 10 pipes can empty 1/3rd of the tank in 10 minutes. How much time (in minutes) will it take to fill the entire tank if all the pipes are opened at the same time?
Hence, 7 pipes of first set can fill 1/10th of the vessel in 1 min.
5 pipes of second set can fill 2/5th of the vessel in 5 minutes
Hence, 5 pipes of second set can fill 2/25th of the vessel in 1 min.
10 pipes of third set can empty 1/3rd of the vessel in 10 minutes.
Hence, 10 pipes of third set can empty 1/30th of the vessel in 1 min
So, if all the pipes are open in one minute 1/10 + 2/25 - 1/30 = 11/75th of the vessel is filled up.
Hence, to fill up the whole vessel, time required= 75/11 minutes.
Mass numbers of some common elements-
Neon- 20
Sodium- 23
Silver- 108
If an article is sold for a gain of 7% instead of selling it at a loss of 13%, a trader gets Rs.1080 more. What is the selling price of the article, when the article is sold at a profit of 25%?
20% of x = 1080
x = 5400
SP = 125% of 5400 = 6750
There are total 10 students whose marks in an exam are 45, 65, 56, (P + 16), (2P + 3), 78, 24, (4P - 8), 44 and 48 respectively and mean marks of first 5 students is 49, then what is mean marks of last 5 students?
185 + 3P = 245
3P = 60
P = 20
Mean marks of first 5 students = [78 + 24 + (4P - 8) + 44 + 48]/5 = (186 + 4P)/5 = 266/5
= 53.2
Select the odd one out: (6 x 10-3), √[(52 + 11) x 10-6], (0.06 ÷ 102) and √0.000036.
√[(52 + 11) x 10-6] = 6 x 10-3 = 0.006
(0.06 ÷ 102) = 0.0006
√0.000036 = 0.006
There is a fraction such that if we add 11/30 to it then it gets reverted. Further if we subtract 1 from numerator then the fraction becomes 2/3. What is the fraction?
According to the 1st condition; m/n + 11/30= n/m ...(1)
According to the 2nd condition; (m - 1)/n = ⅔
=> 3m - 3 = 2n
=> 3m - 2n = 3 ...(2)
By solving equation 1,
=> 30m2 + 11mn - 30n2 = 0
=> (6m - 5n)(5m + 6n) = 0
we get the value of m/n = 5/6, -6/5
applying condition(2), m/n = (5 - 1)/6 = 4/6 = 2/3
Hence the required fraction = m/n = 5/6
How many among the following numbers are Irrational number: 
Ramesh and Suresh invested same amount of money in two banks for 2 years which offer interest at the same rate, but Ramesh invested in a bank which offers compound interest and Suresh invested in a bank which offers simple interest. After two years Ramesh got Rs. 525 as interest and Suresh got Rs. 500 as interest. What is the rate of interest offered by the banks?
Hence amount of interest Suresh will get in first year = 500/2 = Rs. 250
If the same amount is invested and interest rate is same then in first year the interest obtained is same whether it is simple interest or compound interest.
Hence compound interest obtained in 1st year = Rs. 250
Therefore amount of interest obtained in the 2nd year = Rs. (525 - 250) = Rs. 275
Hence rate of interest = 100 x (275 - 250)/250 = 10%
Line graph given below shows the total number of presence of employees in two different companies P and Q on five different working days from Monday to Friday.
Q. What is the sum of the average number of presence of employees in company P and average number of presence of employees in company Q on all the five working days?
Average = 150/5 = 30
Average number of presence of employees in company Q on all the five working days = 24 + 16 + 50 + 28 + 62 = 180
Average = 180/5 = 36
Required sum = 30 + 36 = 66
If [(0.09)2 x (0.3)8 x (0.027) x 1012] / [312 x (0.3)x] = 1, then what is the value of x?
[(0.09)2 x (0.3)8 x (0.027) x 1012] = [312 x (0.3)x]
[(0.3)4 x (0.3)8 x (0.3)3] = [(0.3)12 x (0.3)x]
(0.3)15 / (0.3)12 = (0.3)x
(0.3)3 = (0.3)x
x = 3
In one revolution, the object travels______ distance.
Sita buys a parker pen at Rs. 100 and sell it to Geeta at Rs. 120. Geeta sells this pen to Radha at a price of Rs. 80. Radha sells it back to Sita at Rs. 90. Sita sells it to Roma at Rs. 150. What is Sita's profit/loss %?
S.P. of pen for Sita = Rs 150 - 90 + 120 = 180
Profit % = [(180 - 100)/100] x 100 = 80%
Mahesh is travelling at a distance of 1200 km in Japan by Bullet train. Due to some technical fault in the engine of the train, speed of the train was reduced by 100 km/hr thus overall time of his journey increased by 24 minutes. What was the normal speed of the bullet train?
Hence; 1200/N = A .. (1)
According to the 2nd condition; 1200/(N - 100) = A + 2/5 .. (2)
Equation (2) - Equation (1); 1200/(N - 100) - 1200/N = 2/5
If we will try to solve this equation then it will become too lengthy. Hence such questions we should solve by using the options.
Out of the given options, option (c) satisfies above equation.
Hence; N = 600 km/hr
If 4x - 1/3x = 9, then what is the value of (144x4 - 1)/(27x2 + 2x)?
=> (12x2 - 1)/3x = 9
=> 12x2 - 1 = 27x ------- (i)
Now,
(144x4 - 1)/(27x2 + 2x)
= [(12x2 - 1)(12x2 + 1)]/[x(27x + 2)] ------- [(a2 - b2 = (a - b)(a + b)]
= [27x(27x -1 + 1 +1)]/[x(27x + 2)] ---- {Putting the value of equation (i)]
= [27x(27x + 2)]/[x(27x + 2)]
= 27
What is the simplified value of (cos3 x/sin x) + (cos2 x.cot3 x)?
= (cos3 x/sin3 x) sin2 x + cos2 x cot3 x
= cot3 x sin2 x + cos2 x cot3 x
= cot3 x (sin2 x + cos2 x)
= cot3 x
If 25% of (A + B) is 30% of (A - B), then B is what percent of A?
=> 5A + 5B = 6A - 6B => A = 11B
=> Let p% of B is equal to A
=> p/100 x B = A
=> But B = 11A
What is the ∠SRO if O is the centre of circle, ∠SPO = 550 and ∠POR = 1150
[Sum of opposite angle of a cyclic quadrilateral is 1800.]
∠ROQ = 180∘ − ∠POR = 1800 − 115∘ = 65∘
In △QOR, ∠OQR = ∠ORQ [Angles opposite or same side] ∠ROQ + ∠OQR + ∠ORQ = 180∘
650 + ∠ORQ + ∠ORQ = 180∘
∠ORQ = (1800 − 65∘)/2 = 57.5∘
A number 135 is split into three parts in such a way that all the three parts are in increasing Arithmetic Progression. The Product of the two largest parts is 2160, then what is the ratio of the smallest part to the highest part?
According to questions:
a(a + d) = 2160 ...... (1)
(a - d) + a + (a + d) = 135
a = 45
From equation (1)
45(45 + d) = 2160
(45 + d) = 48
d = 3
Required ratio = (a - d) : (a + d) = 42 : 48 = 7 : 8
Simplify the value of 3[{1/(√9 - √8)} - {1/(√9 + √8)}] + (2 - 3√2)2.
= 3[{(√9 + √8) - (√9 - √8)}/(√9 - √8)(√9 + √8)] + (2 - 3√2)2
= 3[2√8] + (2 - 3√2)2
= 6√8 + (4 + 18 - 12√2)
= 12√2 + (22 - 12√2)
= 22
There are 7 students in a class whose weights are: 54 kg, 45 kg, 48 kg, A kg, 42 kg, 50 kg and 55 kg. If the mean of their weights is 49 kg, then what is the median of their weights?
294 + A = 343
A = 49 kg
Arrange the weights in ascending order = 42, 45, 48, 49, 50, 54, 55
Median of their weights = 4th term in series = 49 kg
The LCM of two numbers is 2376, and their HCF is 22. Find their difference, if the sum of numbers is 682.
22x + 22y = 682
x + y = 31 → (1)
22x x 22y = 2376 x 22
xy = 108 → (2)
Solving (1) and (2), we get
x = 27 and y = 4
Difference = 22x - 22y
= 22(27 - 4)
= 22 x 23
= 506
60 liters of first mixture of milk and water is mixed with another 40 liters mixture of milk and water. After mixing the mixture, the mixture is sold at the cost of pure milk, then what is the percent profit gained if the ratio of milk to water in the first and second mixture is 7: 5 and 3: 5, respectively? Given below are the steps involved. Arrange them in sequential order.
(A) Amount of milk and water in first mixture is 60 x (7/12) = 35 liters and 60 x (5/12) = 25 liters respectively.
(B) Total amount of milk and water is final mixture is (35 + 15) = 50 liters and (25 + 25) = 50 liters respectively.
(C) Percent profit earned = [(100 - 50)/50] x 100 = 100%
(D) Amount of milk and water in second mixture is 40 x (3/8) = 15 liters and 40 x (5/8) = 25 litres respectively.
(E) Cost price of final mixture = 50 x 1 = 50 and selling price of final mixture = 100 x 1 = 100
(A) Amount of milk and water in first mixture is 60 x (7/12) = 35 litres and 60 x (5/12) = 25 liters respectively.
(D) Amount of milk and water in second mixture is 40 x (3/8) = 15 liters and 40 x (5/8) = 25 liters respectively.
(B) Total amount of milk and water is final mixture is (35 + 15) = 50 litres and (25 + 25) = 50 liters respectively.
(E) Cost price of final mixture = 50 x 1 = 50 and selling price of final mixture = 100 x 1 = 100
(C) Per cent profit earned = [(100 - 50)/50] x 100 = 100%
If cosec θ = x + 1/4x, then the value of cosec θ + cot θ is:
⇒ cosec θ - cot θ = 1/k
On adding, we get
2 cosec θ = k + 1/k = 2(x + 1/4x) = k + 1/k
⇒ x + 1/2x = k + 1/k ⇒ k = 2x
At present, the sum of ages of R and K is 63 years. The ratio of their ages after 7 years will be 7: 4 , what is the present age of R?
⇒ present age of K is 63 - x
7 years later
R's age = x + 7
K's age = 63 - x + 7= 70 - x
⇒ (x + 7) / (70 - x) = 7 / 4
⇒ 4x + 28= 490 - 7x
⇒ 11x = 462
⇒ x = 42 years
therefore present age of R = 42 years
If 5 girls can embroider a dress in 9 days, then the number of days taken by 3 girls will be _____.
Days taken by 1 girl to embroider a dress = 9 x 5 days
Days taken by 3 girls to embroider a dress = 9 × 5/3 days = 15 days
In a certain code language, ‘POETRY’ is written as ‘QONDSQX’ and ‘OVER’ is written as ‘PNUDQ.’ How is ‘MORE’ written in that code language?
SIMILARLY
Which of the answer figure is embedded in the problem figure?
answer figure A is embedded in problem figure.
Arrange the words given below in a meaningful sequence.
1. Key
2. Door
3. Lock
4. Room
5. Switch on
1. Key
3. Lock
2. Door
4. Room
5. Switch on
Which of the given answer figure will be the correct mirror image of the problem figure?
A is the correct mirror image.
DIRECTIONS: Which of the words in the following options can be formed using the letter of the given word?
DETERMINATION
There is no ‘L’ in the given word.So, NATIONAL cannot be formed.
There is no ‘V’ in the given word.So, DEVIATION cannot be formed.
DIRECTIONS: Solve the following letter series.
adb _ ac _ da _ cddcb _ dbc _ cbda
DIRECTIONS: Choose the odd one out from the given alternatives.
DIRECTIONS: Choose the odd one out from the given alternatives.
Arrange the following words according to the English Dictionary.
(1) Save
(2) Sausage
(3) Saviour
(4) Savour
(5) Savage
DIRECTIONS: Find the odd one out from the given alternatives.
343 = 7 × 7 × 7
64 = 4 × 4 × 4
27 = 3 × 3 ×3
Select the correct combination of mathematical signs to replace * signs and to balance the given equation:
15 * 24 * 3 * 6 * 17
15 * 24 * 3 * 6 * 17
After applying, + ÷ – =
15 + 24 ÷ 3 – 6 = 17
⇒ 15 + 8 – 6 = 17
⇒ 23 – 6 = 17
⇒ 17 = 17.
DIRECTIONS: In the question given below, an unfolded dice is given in the left side while in the right side, four answer choices are given in the form of complete dices. You have to select the correct answer choice(s) which is are formed by folding the unfolded dice.
Hence, only option (d) is correct.
Pointing to a girl in a photograph, Sunita said, "She is the mother of Renu, whose father is my son". How is Sunita related to that girl?
Rihana walks 3 km from her house in the East direction to reach the bus stop. She takes a bus and goes 17 km ahead. After getting down from the bus, she walks 2 km on the left side, to reach the spot where she meets Santa. Santa and Rihana take a right from that point and travel 3 km to reach the market place. After shopping, they turn right from the market place and walk 2km to reach Sanita house for a cup of tea. What is the straight line distance between Rihana’s house and Sanita house?
Select the correct order of the letters as indicated by the numbers to form a meaningful word.
Hence option D is correct.
DIRECTIONS: Select the related word from the given alternatives.
BDGK : CEHL :: ???? : DFIM
SAME WAY
DIRECTIONS: Which of the words in the following options can be formed using the letter of the given word?
CORRESPONDING
There is only one ‘S’ in the given word. So, RESPONSE cannot be formed.
DIRECTIONS: What will come in place of question marks?
20, 20, 19, 16, 17, 13, 14, 11, ?, ?
1st series:
2nd series:
DIRECTIONS: What should come at the place of question mark?
N5V, K7T, ?, E14P, B19N
DIRECTIONS: In the question below are given few statements followed by few conclusions. You have to take the given statements to be true even if they seem to be at variance from commonly known facts. Read all the conclusions and then decide which of the given conclusion logically follows from the given statements disregarding commonly known facts.
Statements:
All kings are queens.
Some queens are soldiers.
All soldiers are strong.
Conclusions:
I. Some strong are kings.
II. Some queens are strong.
∴ only Conclusion II follows
In the question, select the related digit from the given alternatives.
24 : 60:: 120:conclusion
Similarly,
60 x 5 = 300
How many triangles are there in the following figure?
Thus there are 23 triangles.
AEF, AGF, DEF,
AED, AEG, GJF,
GJH, GFH, FGD,
FDH, FJD, JHD,
GHD, GBH, BHC,
GBC, BCD, DCH,
GED, GDC, ADB,
AGD, BGD
In a certain code language 'POULTRY' is written as 'PRQXNVTY'. How is 'TREASON' written in that code?
As,
SIMILARLY
Solve the given letter series:
W64X49, M100N81, O144P121, ?
DIRECTIONS: The following questions are based on the diagram given below.
The non-Asians who know English are represented by:
Hence option D is correct.
Which of the following rivers does not make an estuary?
Which of the following country's government passed the "Hindu Marriage Bill 2016"?
Hindu Marriage Bill tabled in Pakistan’s National Assembly.
The bill was approved by the standing committee in 2016.
The bill is expected to put an end to the practice of abduction of married Hindu women.
The bill is also expected to curtail forced conversions because it will allow the registration of Hindu marriages in the relevant government departments.
Who among the following has been appointed as part-time chairman of the YES BANK?
Which district of Arunachal Pradesh recently achieved 100% electricity under the Saubhagya Scheme?
Researchers have recently found world's first fully warm blooded fish. Which of the following is the kind of fish?
The atomic power station which is known for an FBTR (Fast Breeder Test Reactor) is __________?
The following character of mercury makes it suitable to use in barometers unlike the water is_______?
Which of the following organizations were NOT formed outside India to help in the struggle for Indian independence?
Which of the following Franchise has won the Premier Badminton League Season 4?
The Concept of Suspension of Fundamental Rights in Indian Constitution has been taken from which Country’s Constitution?
What is called the small grasslands on the slopes of Lesser Himalayan range in Jammu and Kashmir?
Comptroller and Auditor General of India is appointed by ______.
Out of 245 members of Rajya Sabha how many members are elected?
The constitution of India refers to the budget as the ______.
Statement: No Heat Engine can operate with 100% efficiency (convert heat energy to mechanical work). The given statement is_____________.
It is not possible to construct an engine that does nothing but convert heat into useful work.
If some of the heat must go into raising the temperature of a sink, not all of it can be converted into work.
If work is being done by the heat engine, the object on which work is being done is not isolated from the heat engine. Unless it is at the same temperature as the heat source, heat will flow conventionally from the heat source to the object on which work is being done, and the object's temperature will rise.
Which among the following is also called "Artificial sugar"?
Saccharin is often blended with other artificial sweeteners to compensate for each sweetener's weaknesses.
Dynamo is an instrument which works on the process of transforming ____________ Energy to ___________ Energy.
The electric dynamo uses rotating coils of wire and magnetic fields to convert mechanical rotation into a pulsing direct electric current through Faraday's law of induction
Chalcopyrite is the chief ore of copper.
The most. common silver-bearing minerals recovered by flotation are argentiferous galena, native silver, argentite (Ag2S) and tetrahedrite (Cu, Fe, Ag) Sb4S3).
__________ are atoms of the elements having the same atomic number but different mass numbers.
Isobars are atoms having same mass number but different atomic numbers.
Isotones are atoms of different elements having same number of neutrons.
Microbiology is the study of microscopic organisms, such as bacteria, viruses, archaea, fungi and protozoa. This discipline includes fundamental research on the biochemistry, physiology, cell biology, ecology, evolution and clinical aspects of microorganisms (of which Virology may be a part of)
Morphology is the study of forms and features of different part of plants like roots, stems, leaves flowers etc.
Cytokinins are a class of plant growth hormones that promote cell division in plant roots and shoots. They affect apical dominance, axillary bud growth, and leaf senescence
Gibberellin is a type of plant and fungal hormone. Gibberellin can overcome dormancy in seeds, extend the length of cells and encourage division, and even has hormonal and signalling roles in the fruiting and senescence processes.
_______ is a radioactive process in which the nucleus of an atom splits into smaller parts.
For Example- The Sun is a main-sequence star, and thus generates its energy by nuclear fusion of hydrogen nuclei into helium. In its core, the Sun fuses 620 million metric tons of hydrogen each second.
Which of the following is/are not a property of a covalent bond?
These compounds are non-conductors of electrical charge due to the absence of charged ions.
They are bad conductors of heat also. Their molecules lack free electrons and that obstructs the flow of heat energy.
Which of the following are part of group 17 of the the .periodic table, also called "halogens"?
Vulcanisation is a process associated with which of the following materials?
Thyroid gland is associated with which of the following parts in a human body?
The thyroid makes two hormones that it secretes into the blood stream.
These hormones are necessary for all the cells in your body to work normally.
Which of the following makes up to 60%-75% by mass of human body?
The brain and heart are composed of 73% water, and the lungs are about 83% water. The skin contains 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
Water serves several essential functions to keep us all going:
- A vital nutrient to the life of every cell, acts first as a building material.
- It regulates our internal body temperature by sweating and respiration
- The carbohydrates and proteins that our bodies use as food are metabolized and transported by water in the bloodstream;
- It assists in flushing waste mainly through urination
- acts as a shock absorber for brain, spinal cord, and foetus, forms saliva & lubricates joints
For a pendulum in Simple Harmonic Motion, Time period (t) is _______________ to Acceleration due to gravity (g).
T=2π√(l/g)
_______________ is a process in which two or more metal items are joined together.
Current in a 60 W light bulb when it is connected to a 240 V power supply is___________.
P = power
So, 60 = I x 240
I = 60/240
Therefore, I = 0.25 A
_____________ is a thermodynamic process in which there is no heat transfer into or out of a system and is generally obtained by surrounding the entire system with a strongly insulating material.
A system that expands under adiabatic conditions does positive work, so the internal energy decreases, and a system that contracts under adiabatic conditions does negative work, so the internal energy increases.
_________ is a measuring instrument used to measure the current in a circuit.
A voltmeter is an electronic instrument used to measure potential between any two points in an electric or electronic circuit in volts
Odometers are used to calculate distance travelled in a vehicle, used along speedometers.
Which of the following are TRUE regarding the variation of "g "(acceleration due to gravity)?
The acceleration due to gravity:
- Decreases on account of rotation of the earth.
- Increases with the increase in the latitude of the place.
Which of the following is related to the statement that "For a given colour of light, the ratio of the sine of the angle of incident and angle of refraction is same"?
Kirchhoff's current law states that current flowing into a node (or a junction) must be equal to the current flowing out of it. This is a consequence of charge conservation. Kirchhoff's voltage law states that the sum of all voltages around any closed loop in a circuit must equal zero.
Stefan-Boltzmann law, statement that the total radiant heat energy emitted from a surface is proportional to the fourth power of its absolute temperature.
Plasma is a component of which among the following part of human body?
The primary purpose of plasma is to transport nutrients, hormones, and proteins to the parts of the body that need it. Cells also deposit their waste products into the plasma. The plasma, in turn, helps remove this waste from the body. Blood plasma also ushers the movement of all the elements of blood through the circulatory system.
Which of the following is defined as the amount of energy released during the formation of one mole of ionic compound from its constituent ions?
Lattice energy is relevant to many practical properties including solubility, hardness, and volatility.
Hydration energy is the amount of energy released when one mole of ions undergo hydration which is a special case of solvation. It is a special case of dissolution of energy, with the solvent being water.
__________ is the speed that an object needs to be traveling to break free of a planet or moon's gravity well and leave it without further propulsion.
Since escape velocity depends on the mass of the planet or moon that a spacecraft is blasting off of, a spacecraft leaving the moon's surface could go slower than one blasting off of the Earth, because the moon has less gravity than the Earth.
___________is the study of humans and human behaviour and societies in the past and present.
Seismology is the study of earthquakes and seismic waves that move through and around the earth
Psychology is the scientific study of the mind and behaviour. Psychology is a multifaceted discipline and includes many sub-fields of study such areas as human development, sports, health, clinical, social behavior and cognitive processes.
Which of these is/are applications of Ultrasonic Waves ?
Applications include-
- Measuring depth of sea (SONAR)
- Sterilizing Medical equipment
- Cleaning the various industry specific Machinery parts
Which of the following have a pH value less than 7?
Lakes and forests are best classified as examples of _________
An artificial ecosystem is not self-sustaining, and the ecosystem would perish without human assistance. For example, a farm, an aquarium etc.
The biosphere is a global ecosystem composed of living organisms (biota) and the abiotic (non-living) factors from which they derive energy and nutrients extending from a few kilometres into the atmosphere to the deep-sea vents of the ocean.
Gammaxene, D.D.T. and Bleaching powder are important compounds of :
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