Tag: evs - i

Quizzes (164) Questions (1366)

Questions Related to evs - i

Multiple choice evs - i the environment and us pollution of soil degradation of land damaging the forests

Which of the following is/are caused due to deforestation?

  1. Soil erosion

  2. Depletion of water in the catchment areas

  3. Global warming

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Deforestation is the process of cutting or removal of forest to fulfill the need of the population. It has many negative impacts on the environment such as loss of species, soil erosion and reduces rainfall. The tree absorbs water from soil for photosynthesis and produces water vapor that is released into the atmosphere which in turn causes rainfall. If there will be less number of the tree then rainfall will also decrease. Plants absorb carbon dioxide (greenhouse gas) for photosynthesis and releases oxygen. Greenhouse gases absorbs the solar energy and increase the earth's temperature is called as global warming. Thus, the correct answer is option D.

Multiple choice evs - i the environment and us pollution of soil degradation of land damaging the forests

If we uncover half of the forest, covering of the earth, what crisis will be produced at most and at first?

  1. Some species will be extincted

  2. Population and ecological imbalance will rise up

  3. Energy crisis will occur

  4. Rest half forests will maintain this imbalance
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Forest is the home of many of distinct species and even undiscovered species if the forest is uncovered many of the species lost their natural habitat and become extinct which further leads to the following problem like:

  • Rise in population and ecological balance- The number of producer decreases, the dependent consumers will die out of starvation. This lead to rise in ecological imbalance.
  • Energy crises- Due to the decrease in the number of producers.
  • Imbalance in the forest- As the number of producer decreases, the food chain gets disturbed.
So the correct option is 'Some species will be extinct'.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

The first life had appeared about 

  1. 4.8 billion years ago

  2. 3.8 billion years ago

  3. 1.4 billion years ago

  4. 2 billion years ago
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

About 3.8 billion years ago after the formation of earth, single celled prokaryotic cells (bacteria) appeared. It is supposed that the multicellular living organisms evolved from them. So, the correct option is B.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Transitional layer between stratosphere and mesosphere is ______________.

  1. Troposphere

  2. Lithosphere

  3. Stratopause

  4. Tropopause
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The atmosphere is divided into layers separated by transition zones called pauses. The stratopause is the boundary layer that separates the stratosphere from the mesosphere above it.

Multiple choice evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

Thickness of ozone in column of air from ground to top of atmosphere is measured in terms of

  1. Decibel units

  2. Pascal units

  3. Svedberg units

  4. Dobson units

  5. Angstrom units
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A. Decibel (dB) is the unit to measure the intensity of sound.
B. Pascal (Pa) is the unit measure pressure.
C. Svedberg (S) is a non-metric unit used to express the sedimentation coefficient of particles. 
D. Dobson unit (DU) is used to measure the thickness of earth's atmosphere.
E. Angstrom (Å) is a unit of length used to express the size of atoms, molecules etc.
Hence, thickness of ozone in column of air from ground to top of atmosphere is measured in terms of Dobson units.
So, the correct answer is 'Dobson units'.