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Air and Atmosphere Class 7 ICSE Objective for Students
The ozone layer refers to
(A) The atmospheric condition of Antarctica
(B) Modern invention did on the planet Saturn
(C) The layer about 10-20 km below the surface of the Earth
(D) The layer of the atmosphere 15-20 km above the surface of the Earth
Option d – The layer of the atmosphere 15-20 km above the surface of the Earth
The ozone layer lies in the
(A) Troposphere
(B) Tropopause
(C) Stratosphere
(D) Photosphere
Option c – Stratosphere
Which of the following protects life on Earth from the harmful radiations of the Sun?
(A) Troposphere
(B) Ionosphere
(C) Ozone layer
(D) Mist
Option c – Ozone layer
The function of the Ozone layer in the stratosphere is
(A) To stabilize the global temperature
(B) To reduce the frequency of Earthquake
(C) To avoid the failure of monsoons
(D) To prevent ultra-violet radiation effect on the ground
Option d – To prevent ultra-violet radiation effect on the ground
The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is
(A) Troposphere, Stratosphere, Ionosphere, Mesosphere
(B) Stratosphere, Troposphere, Ionosphere, Mesosphere
(C) Troposphere, Stratosphere, Mesosphere, Ionosphere
(D) Stratosphere, Troposphere, Mesosphere, Ionosphere
Option c – Troposphere, Stratosphere, Mesosphere, Ionosphere
Most weather activity occurs in which atmospheric layer?
(A) Ozonosphere
(B) Ionosphere
(C) Troposphere
(D) Exosphere
Option c – Troposphere
The atmosphere is a mixture of several gases. Near the Earth’s surface, it contains mainly
(A) Nitrogen and oxygen
(B) Nitrogen and carbon dioxide
(C) Oxygen and carbon dioxide
(D) Ethane and oxygen
Option a – Nitrogen and oxygen
Which gas has the maximum percentage in the atmosphere?
(A) Carbon
(B) Nitrogen
(C) Oxygen
(D) Hydrogen
Option b – Nitrogen
The stratosphere is said to be ideal for flying jet aircraft. This is because
(A) This layer is rich in ozone which reduces fuel consumption.
(B) The temperature is constant and ideal for aircraft engine efficiency
(C) This layer is out of the firing range of antiaircraft guns
(D) The absence of clouds and other weather phenomena
Option d – The absence of clouds and other weather phenomena
The approximate diameter of the earth is :
(a) 4,200 Km
(b) 6,400 Km
(c) 12,800 Km
(d) 15,600 Km
Option c – 12,800 Km
The place which has the longest day and the shortest night on 22nd December is :
(a) Chennai
(b) Madrid
(c) Melbourne
(d) Moscow
Option c – Melbourne
Geostationary orbit is at a height of :
(a) 6 km
(b) 1000 km
(c) 3600 km
(d) 36,000 km
Option d – 36,000 km
Owing to the equatorial bulge and the polar flattening, the polar radius of the earth falls short of the equatorial radius by about :
(a) 22 km
(b) 36 km
(c) 41 km
(d) 53 km
Option a – 22 km
The earth is at the least distance from the sun (Perihelion) on :
(a) December 22nd
(b) January 3rd
(c) July 4th
(d) June 21st
Option b – January 3rd
The earth is at the largest distance from the sun (Aphelion) on :
(a) June 21st
(b) January 3rd
(c) July 4th
(d) September 23rd
Option c – July 4th
The Earth rotates around an axis pointing towards :
(a) the moon
(b) the pole star
(c) the sun
(d) Venus
Option b – the pole star
Which part of the earth’s surface receives the highest amount of insolation?
(a) Tropical deserts
(b) Equatorial region
(c) Savanna region
(d) No such criteria
Option a – Tropical deserts
What can be the maximum duration of totality for a solar eclipse?
(a) 12.5 minutes
(b) 7 minutes 40 seconds
(c) 1 hour 40 seconds
(d) There is no maximum duration
Option b – 7 minutes 40 seconds
The total surface area of the earth is :
(a) 510 million sq km
(b) 610 million sq km
(c) 710 million sq km
(d) 810 million sq km
Option a – 510 million sq km
What is the approximate equatorial circumference of the earth?
(a) 30,000 Km
(b) 35,000 Km
(c) 40,000 Km
(d) 45,000 Km
Option c – 40,000 Km
Which is the lowest lake from the sea level?
(a) Aral Sagar
(b) Caspian Sea
(c) Baikal
(d) Dead Sea
Option d – Dead Sea
Which is the highest boating lake?
(a) Titicaca
(b) Maracaibo
(c) Athabasca
(d) Ladoga
Option a – Titicaca
Which is the largest saltwater lake in the world?
(a) Dead Sea
(b) Caspian Sea
(c) Vaughan Lake
(d) Aral Sagar
Option b – Caspian Sea
Which of the following is used in artificial rainfall?
(a) Sodium carbonate
(b) Sodium thiosulfate
(c) Silver iodide
(d) Sodium hydroxide
Option c – Silver iodide
Which of the following is the world’s largest lake?
(a) Caspian Sea
(b) Aral Sagar
(c) Superior Lake
(d) Lake Victoria
Option a – Caspian Sea
Which is the deepest lake in the world?
(a) Titicaca
(b) Victoria
(c) Baikal
(d) Dead Sea
Option c – Baikal
Which is the world’s most saline lake?
(a) Caspian Sea
(b) Aral Sagar
(c) Vaughan Lake
(d) Dead Sea
Option c – Vaughan Lake
The four layers of the atmosphere are 1. Ionosphere 2. Mesosphere 3. Stratosphere 4. Troposphere Their correct ascending order in terms of height is Code
(A) 1, 2, 3, 4
(B) 2, 1, 4, 3
(C) 4, 3, 2, 1
(D) 3, 4, 1, 2
Option c – 4, 3, 2, 1
Arrange the following atmospheric zones in terms of the distance from the Earth’s surface in increasing order and select the correct answer from the code given below. 1. Thermosphere 2. Troposphere 3. Stratosphere 4. Mesosphere Code
(A) 1, 3, 4, 2
(B) 2, 3, 1, 4
(C) 3, 4, 2, 1
(D) 2, 3, 4, 1
Option d – 2, 3, 4, 1
Which of the following is correct matching the layer of atmosphere and its characteristics? Troposphere Weather Phenomena 2. Stratosphere – Ozone layer 3. Ionosphere – Radio waves reflected Earth’s surface 4. Mesosphere – Aurorae Code
(A) 1, 2, 3 and 4
(B) Only 1, 2 and 4
(C) Only 1, 2 and 3
(D) Only 2 and 3
Option c – Only 1, 2 and 3
The height of the ozone layer above the surface of the Earth is
(A) 15-20 km
(B) 40-50 km
(C) 70-80 km
(D) 110-120 km
Option a – 15-20 km
Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?
(A) Troposphere
(B) Stratosphere
(C) Mesosphere
(D) Ionosphere
Option d – Ionosphere
Which layer of the atmosphere is responsible for Aurora Borealis?
(A) Troposphere
(B) Thermosphere
(C) Ionosphere
(D) Exosphere
Option c – Ionosphere
Wireless communication is reflected on Earth’s surface by
(A) Troposphere
(B) Stratosphere
(C) Ionosphere
(D) Exosphere
Option c – Ionosphere
Which layer of the Atmosphere is used for Telecommunication?
(A) Troposphere
(B) Thermosphere
(C) Stratosphere
(D) Ionosphere
Option d – Ionosphere
In which atmospheric layer are communication satellites located?
(A) Exosphere
(B) Stratosphere
(C) Ionosphere
(D) Troposphere
Option a – Exosphere
In which year, did the Central Ganga Authority’ establish by the Government of India?
(a) 1975
(b) 1982
(c) 1985
(d) 1995
Option c – 1985
National Ganga River Basin Authority was established on
(a) October 2008
(b) February 2009
(c) October 2009
(d) March 2010
Option b – February 2009
Which of the following has/have shrunk immensely/dried up in the recent past due to human activities? I. Aral Sea II. Black Sea III. Lake Baikal Select the correct answer using the code given below.
(a) Only I
(b) II and III
(c) Only II
(d) I and III
Option d – I and III
Which one of the following is not a cause of depletion in groundwater?
(a) Afforestation
(b) Loss of forests
(c) Excessive pumping of groundwater
(d) Construction of large-scale concrete buildings
Option a – Afforestation
Which of the following is/are the possible consequences of heavy sand mining in riverbeds? I. Decreased Salinity in the river. II. Pollution of Groundwater. III. Lowering of the water table. Select the correct answer using the codes given below.
(a) Only I
(b) II and III only
(c) I and III only
(d) I, II, and III
Option b – II and III only
Which of the following can be found as pollutants in the drinking water in some parts of India? I. Arsenic II. Sorbitol III. Fluoride IV. Formaldehyde V. Uranium Select the correct answer using the code given below.
(a) I and III
(b) II, IV, and V
(c) I, III, and V
(d) All of these
Option c – I, III, and V
Concerning bio-toilets used by Indian Railways, consider the following statements. I. The decomposition of human waste in their toilets is initiated of by fungal inodorum. II. Ammonia and water vapor are ony and products in this decomposition which are released into the atmosphere. Which of the statement given above is/are correct?
(a) Only I
(b) Only II
(c) Both I and II
(d) Neither I nor II
Option d – Neither I nor II
Which one of the following is responsible for blue baby syndrome?
(a) Fluoride
(b) Nitrate
(c) Arsenic
(d) Lead
Option b – Nitrate
The highest chemical pollution is caused by the industrial effluents of
(a) the leather industry
(b) the paper industry
(c) the rayon industry
(d) the textile industry
Option a – the leather industry
The ‘pond bloom’ of blue-green algae which causes the death of fish and cattle produces the toxin of
(a) Ammonia
(b) Hydroxyl Amine
(c) Carbohydrates
(d) Fatty Acids
Option b – Hydroxyl Amine
Water pollution of a river is measured by
(a) the amount of chlorine dissolved in water.
(b) amount of ozone dissolved in water.
(c) amount of nitrogen dissolves in water.
(d) amount of oxygen dissolved in water.
Option d – amount of oxygen dissolved in water
Biological Oxygen Demand (BOD) is a standard criterion for
(a) measuring oxygen levels in the blood.
(b) computing oxygen levels in forest ecosystems.
(c) pollution assessment in aquatic ecosystems.
(d) assessing oxygen levels in high-altitude regions.
Option c – pollution assessment in aquatic ecosystems
A water body having high BOD indicates that its water is
(a) receiving minerals.
(b) being aerated.
(c) being contaminated by sewage.
(d) atrophic.
Option c – being contaminated by sewage
BOD is maximum in the Ganga river between
(a) Haridwar and Kanpur
(b) Kanpur and Allahabad
(c) Allahabad and Patna
(d) Patna and Uluberia
Option b – Kanpur and Allahabad
The water (Prevention and Control of Pollution) Cess Act was implemented in
(a) 1973
(b) 1975
(c) 1977
(d) 1979
Option c – 1977
What is Noise?
(a) Desirable sound
(b) Desirable and unwanted sound
(c) Undesirable and unwanted sound
(d) Undesirable and wanted sound
Option c – Undesirable and unwanted sound
In which unit noise is measured?
(a) Kilometre
(b) Pascal
(c) Kilogram
(d) Decibel
Option d – Decibel
Which of the following is the reason behind the maximum noise pollution?
(a) Heavy traffic
(b) Election meetings
(c) Rock Music
(d) Jet Flight
Option d – Jet Flight
Rainwater collected after 30 to 40 minutes of rain is not suitable for drinking because it
(a) contains bacteria and dirt.
(b) contains dissolved toxic chemicals.
(c) is deficient in minerals.
(d) is acidic.
Option b – contains dissolved toxic chemicals
“Knock-Knee Syndrome” is caused by the pollution of ( Atmospheric Pollution Class 9 ICSE )
(a) Mercury
(b) Lead
(c) Arsenic
(d) Fluoride
Option d – Fluoride
The Minamata incident, an example of environmental degradation, is due to which one of the following?
(a) Air pollution
(b) Nuclear disaster
(c) Water pollution
(d) Thermal pollution
Option c – Water pollution
If National Water Mission is properly and completely implemented, how will it impact the country? I. Part of the water needs of urban areas will be met through the recycling of wastewater. II. The water requirements of coastal cities with inadequate alternative sources of water will be met by adopting appropriate technologies that allow for the use of Ocean water. III. All the rivers of Himalayan origin will be linked to the rivers of peninsular India. IV. The expenses incurred by farmers for digging bore wells and for installing motors and pump sets to draw groundwater will be completely reimbursed by the Government. Select the correct answer using the codes given below.
(a) I only
(b) I and II only
(c) III and IV only
(d) I, II, III, and IV
Option b – I and II only
What is the role of Ultraviolet (UV) radiation in water purification systems? I. It inactivates/kills the harmful microorganisms in water. II. It removes all the undesirable odors from the water. III. It quickens the sedimentation of solid particles, removes turbidity, and improves the clarity of the water. Which of the statements given above is/are correct?
(a) Only I
(b) II and III only
(c) I and III only
(d) I, II, and III
Option a – Only I
With reference to Eutrophication, which of the following statement(s) is/are correct? I. It decreases the dissolved oxygen in the water. II. It is a phenomenon of nutrient enrichment of a water body. Select the correct answer from the codes given below.
(a) Only I
(b) Only Il
(c) Both I and II
(d) Neither I nor Il
Option c – Both I and II
Which of the following are the effects of water pollution? I. E-coli infection II. Fluorosis III. Minamata disease IV. Blue Baby Syndrome Select the correct answer using the codes given below.
(a) I and III
(b) I, II, and Ill
(c) I and Il
(d) All of these
Option d – All of these
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