Name the greenhouse gas discharged from a refrigerator
WBBSE
Class X
Physical Science
Concerns about our Environment
01 Mark
2025
Chlorofluorocarbon (CFC)
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Which layer of atmosphere is susceptible to storm and rain?
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Troposphere
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State one harmful effect of ultraviolet rays.
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Ultraviolet (UV) rays can cause skin cancer.
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What is the unit of concentration of ozone layer?
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Dobson Unit (DU)
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Identify the greenhouse gas: (a) Oxygen (b) Hydrogen (c) Water vapour (d) Nitrogen
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(c) Water vapour Explanation A greenhouse gas is a gas that absorbs...
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Chlorine atom (Cl) destroys Ozone molecule (O3) – show with the help of a chemical...
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Chlorine reacts with ozone: Cl + O3 → ClO + O2 Chlorine...
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The major constituent of Biogas is (a) CH4 (b) CFC (c) CO2 (d) CO
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(a) CH4 Explanation Biogas primarily consists of methane (CH4), with small amounts...
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The amount of which greenhouse gas in the atmosphere increases by the burning of fossil...
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Carbon dioxide.
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What is meant by the calorific value of a sample of coal is 30,000 kJkg-1?
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The calorific value of a sample of coal being 30,000 kJ/kg means...
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Name a gas present in the atmosphere which is not a greenhouse gas.
A.
Nitrogen (N2).
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Which of the following gases helps in the depletion of ozone in the ozone layer?
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c. CFCs Explanation: CFCs (chlorofluorocarbons) are the gases responsible for the depletion...
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Which type of energy is transformed to electrical energy in a dynamo?
A.
In a dynamo, mechanical energy is transformed into electrical energy.
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What is the SI unit of calorific value of fuels?
A.
The SI unit of calorific value of fuels is joules per kilogram...