Well structured WBBSE Class 10 Physical Science MCQ Questions Chapter 1 Concerns About Our Environment can serve as a valuable review tool before exams.
Concerns About Our Environment Class 10 WBBSE MCQ Questions
Multiple Choice Questions :
Question 1.
Which one of the following compounds is responsible for depletion of ozone layer ?
(A) Methane
(B) Chlorofluorocarbon
(C) Carbon dioxide
(D) Ethylene
Answer:
(B) Chorticmaren
Question 2.
Which of the ivilowing protects life on earth from ultraviolet radiation.
(A) Ozonu, nere
(B) lonosphere
(C) Troposphere
(D) Thermosphere
Answer:
(A) Ozonosphere
Question 3.
The source of heat on the surface of the sun:
(A) Nuclear fusion reaction
(B) Thermal reaction
(C) Nuclear fission reaction
(D) Redox reaction
Answer:
(A) Nuclear fusion reaction
Question 4.
The SI unit of calorific value is :
(A) Cal g-1
(B) BThu g-1
(C) J kg-1
(D) J g-1
Answer:
(C) d kg
Question 5.
Several solar cells when connected in series and parallel form a :
(A) Solar Panel
(B) Solar key
(C) Solar Cooker
(D) Solar disc.
Answer:
(A) Solar Pane!
Question 6.
What is the chief source of energy for all natural activities:
(A) Wind energy
(B) Solar energy
(C) Thermal energy
(D) Tidal energy
Answer:
(B) Solar energy
Question 7.
Ignition temperature is :
A The minimum temperature at which the substance begins to burn.
(B) The maximum temperature at which the substance begins to burn.
(C) The minimum temperature at which the substance begins to form.
(D) The maximum temperature at which the substance begins to form
Answer:
(A) The minimum temperature at which the substance begins to burn.
Question 8.
The fuel used as aviation fuel in jet aeroplanes is a special grade of :
(A) Petrol
(B) Kerosene
(C) Ethanol
(D) Methanol
Answer:
(B) Kerosene
Question 9.
What is the principle behind a solar power plant ?
(A) Light energy changes into electrical energy
(B) Light energy changes into kinetic energy
(C) Heat energy changes into light energy
(D) Light energy changes into heat energy
Answer:
(A) Light energy changes into electrical energy.
Question 10.
Name any two materials that are used for making solar cells :
(A) Copper, Zinc
(B) Selenium, Silicon
C) Iron, Copper
(D) Gold, Platinum
Answer:
(B) Selenium, Silicon
Question 11.
Nearly 30% of Sunlight consists of which rays that produce heating effect :
(A) Infrared
(B) Far infrared
(C) Visible
(D) Ordinary rays
Answer:
(A) Infrared
Question 12.
Solar energy is :
A Energy obtained from sun in the form of light and heat
B) Energy obtained from sun in the form of sound energy
(C) Energy obtained from sun in the form of kinetic energy
(D) Energy obtained from sun in the form of magnetic energy
Answer:
(A) Energy obtained from sun in the form of light and heat
Question 13.
A device which converts solar energy into electrical energy is :
(A) Generator
(B) voltaic cell
(C) Photovoltaic cell
(D) Motor engine
Answer:
(C) Photovoltaic cell
Question 14.
What is left behing as a residue when wood is burnt in a limited supply of oxygen
(A) Wood
(B) Charcoal
(C) CO
(D) CO2
Answer:
(B) Charcoal
Question 15.
The difference between the output energy and the input energy is termed as :
(A) Net energy output
(B) Maximum output energy
(C) Minimum output energy
(D) Zero output energy
Answer:
(A) Net energy output
Question 16.
Which metal is used in connecting wires that connect solar cells in a solar panel ?
(A) Copper
(B) Silver
(C) Iron
(D) Gold
Answer:
(B) Silver
Question 17.
Energy source that can be replenished, once they are used up are called :
(A) Renewable sources
(B) Natural sources
(C) Non-renewable sources
(D) Synthetic sources.
Answer:
(A) Renewable sources
Question 18.
The major source of CO pollution is
(A) exhaust from automobiles
(B) forest fires
(C) volcanic eruptions
(D) industrial process
Answer:
(A) Exhaust from automobiles
Question 19.
Which of the following oxides of nitrogen is not a common air pollutant?
(A) N2O
(B) NO
(C) NO2
(D) N2O5
Answer:
(D) N2O5
Question 20.
Man made chemical responsible for the depletion of ozone layer is
(A) Ethylene
(B) Acetylene
(C) Teflon
(D) CFC
Answer:
(D) CFC
Question 21.
Biosphere is :
(A)The gases enveloping the earth
(B) Earth’s crust
(C) Surface and ground waters
(D) Region of earth where life exists
Answer:
(D) Region of earth where life exists.
Question 22.
Maximum quautum of ozone is present in :
(A) Stratosphere
(B) Mesosphere
(C) Troposphere
(D) Thermosphere
Answer:
(A) Stratosphere
Question 23.
Which of the following is not a chemical pollutant ?
(A) Solid wastes
(B) Liquid wastes
(C) Pesticides
(D) Noise
Answer:
(D) Noise
Question 24.
Which out of the following is not a bio-degradable pollutant ?
(A) Mercuric Salts
(B) Lead Salts
(C) Pesticides
(D) Domestic wastes
Answer:
(D) Domestic wastes
Question 25.
Ozone layer is present in
(A) Troposphere
(B) lonosphere
(C) Stratosphere
(D) Mesosphere
Answer:
(C) Stratosphere
Question 26.
Deplection of ozone layer causes
(A) Lung cancer
(B) Breast cancer
(C) Blood cancer
(D) Skin cancer
Answer:
(D) Skin cancer
Question 27.
The compound present in maximum amount in acid rain is :
(A) H2 CO3
(B) HCl
(C) HNO3
(D) H2 SO4
Answer:
(D) H2 SO4
Question 28.
The aromatic compounds present as particulates are :
(A) Benzene
(B) Toluene
(C) Polycyclic hydrocarbons
(D) Nitrobenzene
Answer:
(C) Polycyclic hydrocarbons
Question 29.
Ozone is stratosphere in depleted by :
(A) CF2 Cl2
(B) C7 F6
(C) CF6 Cl6
(D) C6 F6
Answer:
(A) CF2 Cl2
Question 30.
The smog is essentially caused by the presence of :
(A) O2 and O3
(B) O3 and N2
(C) Oxides of sulphur and Nitrogen
(D) Oxygen and Nitrogen
Answer:
(C) Oxides of sulphur and Nitrogen
Question 31.
Which of the following is secondary pollutant ?
(A) CO2
(B) N2 O
(C) PAN
(D) SO2
Answer:
(C) PAN
Question 32.
In Antarctica, Ozone depletion is due to the formation of the following compound:
(A) Acrolein
(B) Peroxyacetyl Nitrate (PAN)
(C) SO2 and SO3
(D) Chlorine nitrate
Answer:
(D) Chlorine nitrate
Question 33.
Excess nitrate in drinking water can cause :
(A) Methenoglobinemia
(B) Kidney damage
(C) Liver damage
(D) Laxatioc effect
Answer:
(A) Methenoglobinemia
Question 34.
What is the safety limit of arsenic content in drinking water according to WHO ?
(A) 0.01 mgL-1
(B) 0.1 mgL-1
(C) 0.001 mgL-1
(D) 0.05 mgL-1
Answer:
(A) 0.01 mgL
Question 35.
White lung disease attacks
(A) Workers of paper mills
(B) Coal mines workers
(C) Cotton mills workers
(D) Workers of cement factories
Answer:
(C) Cotton mills workers.
Question 36.
Black lung disease attacks
(A) Coal mine workers
(B) Workers of paper mill
(C) Workers of Cement factory
(D) Workers of cotton factory
Answer:
(A) Coal mine workers
Question 37.
The process of decompositon of dead animals and their excreta by bacteria present in soil is called
(A) Humificatian
(B) Oxidation
(C) Nitrification
(D) None of these
Answer:
(A) Humification
Question 38.
The main cause of minamata disease is
(A) Arsenic pollution
(B) Lead pollution
(C) Cadmium pollution
(D) Mercury pollution
Answer:
(D) Mercury pollution.
Question 39.
Which of the following is not a constituent of Los Angels smog ?
(A) Cx Hy
(B) O3
(C) NO2
(D) SO2
Answer:
(D) SO.
Question 40.
In any sample of water it is always found that
(A) BOD > COD
(B) BOD < COD
(C) BOD = COD
(D) None of these
Answer:
(B) BOD < COD
Question 41.
Depletion of ozone layer over Antarctica takes place :
(A) in November
(B) in the months of Seplember and October
(C) in the months of October and November
(D) in summer
Answer:
(B) in the months of September and October
Question 42.
Ozone layer of stratosphere requires protection from indiscriminate use of :
(A) Pesticides
(B) Atomic explosions
(C) Aerosols and high flying jets
(D) Ballons
Answer:
(C) Aerosols and high flying jets
Question 43.
Ultraviolet light causes :
(A) Formation of pyrimidines
(B) Sticky metaphases
(C) Photodynamic action
(D) Destruction of hydrogen bonds between complementary DNA strands
Answer:
(D) Destruction of hydrogen bonds between complementary DNA strands
Question 44.
The instrument used for measuring soil salinity is :
(A) Photometer
(B) Voltameter
(C) Conductivitymeter
(D) Calorimeter
Answer:
(C) Conductivitymeter
Question 45.
Which of the following region is the coldest ?
(A) Stratosphere
(B) Troposphere
(C) Mesosphere
(D) Thermosphere
Answer:
(C) Mesosphere
Question 46.
The number of ozone molecules converted into oxygen by one molecule of chlorofluorocarbon compound is :
(A) One hundred (approximately)
(B) Ten thousand (approximately)
(C) Hundred thousand (approximately)
(D) Only one
Answer:
(C) Hundred thousand (approximately)
Question 47.
Temperature of troposphere decreases with altitude. This is because of:
(A) High pressure of air
(B) Gases present in air
(C) Lower density of air
(D) All of these
Answer:
(C) Lower density of uir
Question 48.
Cyclone collector is used for minimising
(A) Radioactive pollution
(B) Air pollution
(C) Noise pollution
(D) Water pollution
Answer:
(B) Air pollution
Question 49.
Which of the following is not a part of green chemistry ?
(A) Photochemistry
(B) Sonochemistry
(C) Nuclear chemistry
(D) Biochemistry
Answer:
(C) Nuclear chemistry
Question 50.
Sewage water is purified by :
(A) Microorganism
(B) Light
(C) Fishes
(D) Equatic plants
Answer:
(A) Microorganism
Question 51.
Which of the following energy sources is not responsible for global warming ?
(A) Fossil fuels
(B) Solar energy
(C) Methane hydrate
(D) All of these
Answer:
(B) Solar energy
Question 52.
Among the following fuels whose quality is most bad ?
(A) Coal
(B) Petro
(C) LPG
(D) Methane
Answer:
(A) Coal
Question 53.
Which one of the following is not a renewable energy source?
(A) Tidal energy
(B) Biomass energy
(C) Petrol
(D) Solar energy
Answer:
(C) Petrol
Question 54.
Which one is the source of all energies ?
(A) Solar
(B) Coal
(C) Petroleum
(D) Electric
Answer:
(A) Solar
Question 55.
The minimum wind speed requires for running a wind mill is :
(A) 50 km / hr
(B) 15 km / hr
(C) 25 km / hr
(D) 10 km / hr
Answer:
(B) 15 km / hr
Question 56.
Which one among the following deos not act as a natural sink for greenhouse gases ?
A) condensation
(B) ocean
(C) respiration
(D) photosynthesis
Answer:
(C) respiration
Question 57.
Which one is not caused by greenhouse effect ?
(A global warming
(B) rise in sea level
(C) ozone hole formation
(D) change in rainfall pattern
Answer:
(C) ozone hole formation
Question 58.
Which among the following gases has the highest Global Warming Potential (GWP) ?
(A) SF6
(B) CFC-12
(C) CO2
(D) CH4
Answer:
(B) CFC-12
Question 59.
Ozone hole refers to stratospheric ozone depletion below
(A) 25-30 DU
(B) 200-220 DU
(C) 250-300 DU
(D) 350-400 DU
Answer:
(B) 200-220 DU
Question 60.
Which of the following is the most lethal UV ray ?
(A) Short UV
(B) UV – A
(C) UV – B
(D) UV-C
Answer:
(D) UV – C
Question 61.
Which of the following elements present in Chlorofluorocarbon is responsible for formation of ozone hole?
(A) fluorine
(B) chlorine
(C) carbon
(D) nitrogen
Answer:
(B) chlorine
Question 62.
We live in :
(A) Ionosphere
(B) Mesosphere
(C) Stratosphere
(D) Troposphere
Answer:
(D) Troposphere
Question 63.
E-reglon is observed in :
(A) Stratosphere
(B) Mesosphere
(C) lonosphere
(D) Ozonosphere
Answer:
(C) lonosphere
Question 64.
At present the maximum energy need is fulfilled by
(A) solar energy
(B) wind energy
(C) biogas
(D) fossil fuel
Answer:
(D) fossil fuel
Question 65.
Sweet gas refers to :
(A) CBM
(B) CNG
(C) CO2
(D) CO
Answer:
(A) CBM
Question 66.
Methane hydrate is also known as :
(A) fire ice
(B) dry ice
(C) packing ice
(D) solid ice
Answer:
(A) fire ice
Question 67.
Solar cells are made up of :
(A) conductors
(B) semi-conductors
(C) insulators
(D) superconductors
Answer:
(B) semi-conductors
Question 68.
The value of solar constant is :
(A) 1.2 Kw / m2
(B) 1.4 Kw / m2
(C) 1.6 Kw / m2
(D) 1.8 Kw / m2
Answer:
(B) 1.4 Kw / m2
Question 69.
Which of the following is not a fossll fuel ?
(A) Methane
(B) gasolene
(C) liquid hydrogen
(D) kerosene
Answer:
(A) Methane
Question 70.
Which element contalned in a fuel contributes to tts high calorific value ?
(A) carbon
(B) hydrogen
(C) oxygen
(D) nitrogen
Answer:
(B) hydrogen
Fill in the blanks :
1. The total mass of gaseous substances in the atmosphere is nearly _______.
Answer:
5.5 × 1015 ton
2. The amount of carbon dioxide in the atmosphere is approximately _______.
Answer:
0.031%
3. CO, when mixed with water, forms ______.
Answer:
Carboxyhaemoglobin
4. The lung disease caused by silica is _______.
Answer:
silicosis
5. The word, ‘PAH’ denotes _______.
Answer:
polyaromatic hydrocarbon
6. Between NO2 and NO _______ is more harmful.
Answer:
NO2
7. The word ‘CFC’ means _______.
Answer:
Chlorofluorocarbon
8. One remarkable phenomenon happened in the troposphere is ________.
Answer:
greenhouse
9. The formation of ozone hole increases the tendency of human being to be attacked by ________.
Answer:
cancer
10. Green house gases can absorb ______ radiation.
Answer:
infra-red
11. Depletion of ozone layer takes place mainly over ________.
Answer:
Antarctica
12. The whirlpool of wind formed in the stratosphere surrounding Antarctica is known as ________.
Answer:
Polar vortex
13. The formation of chlorophyll is retarded in presence of SO2. This phenomena is known as ________.
Answer:
chlorosis
14. London smog is ________ in nature.
Answer:
reducing
15. The depletion of ozone over Antarctica occurs in ________ season.
Answer:
spring
16. The main air pollutants are ________,________,________.
Answer:
SO2, SO3, NO2
17. The pH of ordinary rain water is ________.
Answer:
5.6
18. ________ may contain cancer causing hydrocarbons.
Answer:
sooty smcke
19. Plant grow ________ in high concentration of CO2.
Answer:
better
20. The smoke of cars pollutes air as there is ________ gas.
Answer:
CO
21. SO2 and NO2 cause pollution by increasing ________.
Answer:
acidity
22. The full form of TEL is ________.
Answer:
Tetra ethyl lead
23. Mesosphere and thermosphere are collectively known as ________.
Answer:
ionosphere
24. Gas released during Bhopal tragedy was ________.
Answer:
methyl iso cyanate (MIC)
25. Methane gas producing field is ________.
Answer:
paddy field.
26. Natural gas contains ________% CH4.
Answer:
95
27. Forest wood is a ________ source of energy.
Answer:
renewable.
28. The main constituent of gobar gas is ________.
Answer:
Methane
29. Wind farms are located in ________ regions.
Answer:
Coastal rgions and hilly regions
30. The material need to prepare solar cell ________.
Answer:
Silicon and gallium
31. Calorific value of methane is ________.
Answer:
55 kj g-1
32. Carbon black is prepared from ________.
Answer:
methane
33. ________ contains most of the satellites orbiting the earth.
Answer:
Exosphere
34. Columnt, iensity of ozone is measured in ________.
Answer:
Dobson unit
35. Greenhouse gases can absorb ________ radiation.
Answer:
infrared
36. CO2, water vapour, methane etc. are ________ gases.
Answer:
greenhouse
37. Wave length of the light radiated by ea. h is ________ than that of the incident rays.
Answer:
longer
38. ________ includes all types of water resources such as seas, oceans, rlvers etc.
Answer:
Hydrosphere
39. Ozone is present in ________.
Answer:
stratosphere
40. Cloud formation occurs at ________.
Answer:
troposphere
41. In troposphere, temperature ________ with increase in altitude.
Answer:
decreases
42. An ozone depleting agent is ________.
Answer:
CFC.
State whether the following statement is True or False : VSA
Question 1.
A solar panel is composed of a number of solar cellis.
Answer:
True
Question 2.
Blomass is a direct form of solar energy.
Answer:
False
Question 3.
Calorific value of coal is more than that of petrol.
Answer:
False
Question 4.
Wind energy is a canventional source of energy.
Answer:
False
Question 5.
Agricultural reduce is a blomass.
Answer:
True
Question 6.
Power generated by a single solar cell ts very small.
Answer:
True
Question 7.
Natural gas is an environmental friendly fuel.
Answer:
True
Question 8.
A good fuel should have high calorific value.
Answer:
True
Question 9.
Fossil fuel is environmentally clean fuel.
Answer:
False
Question 10.
Calorific value of coal is more than that of petrol.
Answer:
False