4th Grade > Science
OUR ENVIRONMENT MCQs
Total Questions : 36
| Page 2 of 4 pages
Answer: Option A. -> True
:
A
Nitrogen is responsible for maintainingfood products fresh. Hence, nitrogen isused in packaging of chips.
:
A
Nitrogen is responsible for maintainingfood products fresh. Hence, nitrogen isused in packaging of chips.
Answer: Option A. -> weathering
:
A
Weathering is a process where rock is worn away or broken down into smaller pieces due to natural factors like wind, water, sunlight/heat and so on.
:
A
Weathering is a process where rock is worn away or broken down into smaller pieces due to natural factors like wind, water, sunlight/heat and so on.
Answer: Option A. -> Winter
:
A
When the southern hemisphere is facing towards the sun, northern hemisphere is facing away from sun marking summer and winter in regions respectively.
:
A
When the southern hemisphere is facing towards the sun, northern hemisphere is facing away from sun marking summer and winter in regions respectively.
Answer: Option A. -> Troposphere
:
A
The air around the earth contains a mixtures of gases such as nitrogen, oxygen, carbon dioxide, water vapour and dust particles. The troposphere of the atmosphere contains about 80% of the total mass of gases in the air. It holds a maximum percentage of all the essential gases responsible for life on earth.
:
A
The air around the earth contains a mixtures of gases such as nitrogen, oxygen, carbon dioxide, water vapour and dust particles. The troposphere of the atmosphere contains about 80% of the total mass of gases in the air. It holds a maximum percentage of all the essential gases responsible for life on earth.
Answer: Option A. -> True
:
A
Tilt in the Earth's axis is the reason behind the different seasons on the Earth. Different parts of the Earth receive different amount of sunlight throughout the year. So, when north pole tilts towards the Sun, it is summer in northern hemisphere and winter in southern hemisphere.
:
A
Tilt in the Earth's axis is the reason behind the different seasons on the Earth. Different parts of the Earth receive different amount of sunlight throughout the year. So, when north pole tilts towards the Sun, it is summer in northern hemisphere and winter in southern hemisphere.
Answer: Option D. ->
Equator
:
D
:
D
Equator is the imaginary line that passes through the centre of the Earth, dividing it into northern and southern hemispheres.
Answer: Option B. ->
Stratosphere
:
B
:
B
About 90% of ozone is present in the stratosphere. It is between 10 and 17 kilometers above the Earth's surface and extends up to 50 kilometers. This layer protects the Earth from the harmful UV rays.
Answer: Option B. ->
Automobiles
:
B
:
B
Carbon monoxide is a poisonous gas. The incomplete combustion of carbon-containing fuels, such as gasoline, natural gas, oil, coal, and wood leads to the formation of it. Out of the given options, automobiles are the source of carbon monoxide production.
Answer: Option C. ->
Carbon monoxide
:
C
:
C
Incomplete burning of fuel leads to the formation of carbon monoxide which is a poisonous gas. Carbon monoxide gas, when inhaled, combines with blood and reduces its oxygen carrying capacity thereby damaging the nervous system and even results in death.
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