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SSC CGL Tier 2 Test 63
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SSC CGL Tier 2 Test 63

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  • Question 1/10
    1 / -0

    Directions For Questions

    Read the following passage and answer the questions given after it. 

    Over twenty-five per cent of all amphibians are in serious danger of going extinct. Why are some species more vulnerable to extinction than others? How can current rates of individual survival and reproduction be projected into the future?

    Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time. Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography. Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the Twenty-First century. But all populations, from disease organisms to wild-harvested fish stocks and forest trees to the species in a successional series to laboratory fruit files and paramecia have been the subject of basic and applied population biology.

    An organism’s life history is a record of major events relating to its growth, development, reproduction, and survival. Life histories vary tremendously from one species to the next. Why all the variation? For example, why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops), while others live on to reproduce repeatedly (most plants and vertebrates)? The study of population ecology includes understanding, explaining, and predicting species distributions. Why do species inhabit particular areas, and how are they prevented from establishing beyond their range limits? Such range questions have become popular in the last decade or so in response to concerns about climate change.

    ...view full instructions

    What does population ecology mean?

    Solutions
    The first sentence of the second paragraph “Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time.” Gives the answer to this question. Thus, option A is the right answer.
  • Question 2/10
    1 / -0

    Directions For Questions

    Read the following passage and answer the questions given after it. 

    Over twenty-five per cent of all amphibians are in serious danger of going extinct. Why are some species more vulnerable to extinction than others? How can current rates of individual survival and reproduction be projected into the future?

    Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time. Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography. Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the Twenty-First century. But all populations, from disease organisms to wild-harvested fish stocks and forest trees to the species in a successional series to laboratory fruit files and paramecia have been the subject of basic and applied population biology.

    An organism’s life history is a record of major events relating to its growth, development, reproduction, and survival. Life histories vary tremendously from one species to the next. Why all the variation? For example, why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops), while others live on to reproduce repeatedly (most plants and vertebrates)? The study of population ecology includes understanding, explaining, and predicting species distributions. Why do species inhabit particular areas, and how are they prevented from establishing beyond their range limits? Such range questions have become popular in the last decade or so in response to concerns about climate change.

    ...view full instructions

    Which of the following are the most important aspects of population ecology?
    Solutions
    The sentence “Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography.” answers this question. Therefore, option C is the right answer.
  • Question 3/10
    1 / -0

    Directions For Questions

    Read the following passage and answer the questions given after it. 

    Over twenty-five per cent of all amphibians are in serious danger of going extinct. Why are some species more vulnerable to extinction than others? How can current rates of individual survival and reproduction be projected into the future?

    Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time. Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography. Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the Twenty-First century. But all populations, from disease organisms to wild-harvested fish stocks and forest trees to the species in a successional series to laboratory fruit files and paramecia have been the subject of basic and applied population biology.

    An organism’s life history is a record of major events relating to its growth, development, reproduction, and survival. Life histories vary tremendously from one species to the next. Why all the variation? For example, why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops), while others live on to reproduce repeatedly (most plants and vertebrates)? The study of population ecology includes understanding, explaining, and predicting species distributions. Why do species inhabit particular areas, and how are they prevented from establishing beyond their range limits? Such range questions have become popular in the last decade or so in response to concerns about climate change.

    ...view full instructions

    What percentage of the total amphibians are on the verge of going extinct?
    Solutions
    The line “Over twenty-five percent of all amphibians are in serious danger of going extinct” makes it clear that 25% is on the verge of going extinct. Hence option B is correct.
  • Question 4/10
    1 / -0

    Directions For Questions

    Read the following passage and answer the questions given after it. 

    Over twenty-five per cent of all amphibians are in serious danger of going extinct. Why are some species more vulnerable to extinction than others? How can current rates of individual survival and reproduction be projected into the future?

    Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time. Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography. Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the Twenty-First century. But all populations, from disease organisms to wild-harvested fish stocks and forest trees to the species in a successional series to laboratory fruit files and paramecia have been the subject of basic and applied population biology.

    An organism’s life history is a record of major events relating to its growth, development, reproduction, and survival. Life histories vary tremendously from one species to the next. Why all the variation? For example, why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops), while others live on to reproduce repeatedly (most plants and vertebrates)? The study of population ecology includes understanding, explaining, and predicting species distributions. Why do species inhabit particular areas, and how are they prevented from establishing beyond their range limits? Such range questions have become popular in the last decade or so in response to concerns about climate change.

    ...view full instructions

    Which are the organisms which die immediately after reproducing?
    Solutions

    The line “why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops)” clearly states that option A is the right answer.

  • Question 5/10
    1 / -0

    Directions For Questions

    Read the following passage and answer the questions given after it. 

    Over twenty-five per cent of all amphibians are in serious danger of going extinct. Why are some species more vulnerable to extinction than others? How can current rates of individual survival and reproduction be projected into the future?

    Population ecology is the study of these and other questions about what factors affect the population and how and why a population changes over time. Population ecology has its deepest historical roots, and its richest development, in the study of population growth, regulation, and dynamics, or demography. Human population growth serves as an important model for population ecologists, and is one of the most important environmental issues of the Twenty-First century. But all populations, from disease organisms to wild-harvested fish stocks and forest trees to the species in a successional series to laboratory fruit files and paramecia have been the subject of basic and applied population biology.

    An organism’s life history is a record of major events relating to its growth, development, reproduction, and survival. Life histories vary tremendously from one species to the next. Why all the variation? For example, why do some organisms die immediately after reproducing (some salmon and bamboos, many insects, and all-grain crops), while others live on to reproduce repeatedly (most plants and vertebrates)? The study of population ecology includes understanding, explaining, and predicting species distributions. Why do species inhabit particular areas, and how are they prevented from establishing beyond their range limits? Such range questions have become popular in the last decade or so in response to concerns about climate change.

    ...view full instructions

    What is the theme of this passage?
    Solutions
    The passage talks about population ecology and it is the main theme throughout the passage. Hence option C is correct.
  • Question 6/10
    1 / -0
    A farmer purchased a piece of land of Rs. 18 lakh and spent Rs. 3 lakh for registration, fencing etc. He sold it for Rs. 24.57 lakh. Find his profit in percentage?

    (A) 15%

    (B) 14.15%

    (C) 16.5%

    (D) 17%

    Solutions

    Net CP = 18+3 = 21lacs
    SP = 24.57 lacs
    Gain = SP-CP = 3.57 lacs
    Profit % = 3.57/21 x 100 = 17%

  • Question 7/10
    1 / -0
    5 kg sugar whose cost price is Rs.15/kg  and 10 kg another type of sugar whose cost price is Rs.18/kg are mixed and sold at Rs.20/kg. Find out percentage of profit?

    (A) 18%

    (B) 17.65%

    (C) 17.5%

    (D) 19%

    Solutions
    Total CP of 15 kg sugar = 15x5 + 18x10 = 255
    Total SP of 15 kg sugar = 20x15 = 300
    Profit = 300 - 255 = 45
    profit% = 45/255×100 = 17.65%
  • Question 8/10
    1 / -0
    Efficiency of A is 25% more than B who completes a task in 60 days. C takes  days less than the days taken by A and B together to complete the work. If A and B work for 16 days, after that both left the task then find in how many days C will complete remaining work?
    Solutions

    For A & B

    Ratio of efficiency = 5 : 4

    Ratio of time taken = 4 : 5

    So time taken by A to complete the work = 60 × (4/5) = 48 days

    Let the total work be 240

    Efficiency of A = 240/48 = 5

    Efficiency of B = 240/60 = 4

    Time taken by A and B together = 240/9 = 80/3 days

    Time taken by C = 80/3 – 20/3 = 20 days

    Efficiency of C = 240/20 = 12

    Work done by A & B in 16 days = 16  9 = 144

    Remaining work = 240 – 144 = 96

    Time taken by C to complete the remaining work = 96/12 = 8 days.

  • Question 9/10
    1 / -0
    The platform of a station 400 m long starts exactly where the last span of a bridge 1.2 km long ends. How long will a train 200m long and travelling at the speed of 72 km/ h take to cover the distance between the starting point of the span of the bridge and the far end of the platform?
    Solutions

    Length of bridge = 1.2 km

    Length of platform = 400 m

    Length of the train = 200 m

    Total distance traveled by train = 1200 + 400 + 200 = 1800 km = 1.8 km

    Now

    ⇒

  • Question 10/10
    1 / -0
    The ratio between the speeds of two train is 5 : 7 . If the first train covers 300 km in 3 hours, then the speed (in km/h) of the second train is :
    Solutions

    Ratio between the speeds = 5 : 7

    Let the speed of first train be 5x and that of second train be 7x.

    Distance = 300 km

    Time = 3 hrs






    The speed of second train is 140km/hr

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