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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following can be considered as spontaneous combustion?A. Burning of LPGB. Burning of magnesium ribbonC. Burning of camphorD. Burning of white phosporus |
| Answer» Spontaneous combustion is the burning of a substance at room temperature. White phosphorus burns at room temperature. | |
| 2. |
Which of the following phenomena is an effect of acid rain ?A. An increase in frequency of floodsB. Unseasonal rainfallsC. Harmuful affects by UV raysD. Death of aquatic animals |
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Answer» Correct Answer - D Due to acid rain, sculptures and monuments get damaged and also water bodies like revers, ocens get acidified. This acidified water affects the aquatic life which leads to death and decay of aquatic animals. |
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| 3. |
Which of the following distinguishes respiration form combustion?A. Requirement of oxygen.B. Exothermic nature of reactions.C. Energy can be released only in the form of heat and not light.D. Can take place at any temperauture. |
| Answer» Correct Answer - C | |
| 4. |
Golbal warming is mainly due toA. reradiation of U.V. rays by `CO_(2)andH_(2)O`.B. reradiation of I.R. rays by `CO_(2)andH_(2)O`.C. reradiation of I.R. rays by`O_(2)andN_(2)`.D. reradiation of U.V. rays by `O_(2)andN_(2)` |
| Answer» Correct Answer - B::C | |
| 5. |
What are the effects of oxides of sulphur and nitrogen on the atmosphere? |
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Answer» (i) Dissolution of oxides (ii) Effect on soil (iii) Effect on builidings |
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| 6. |
Which of the following minerals does not contain oxygen?A. SilicatesB. CarbonatesC. PyritesD. None of these |
| Answer» Correct Answer - C | |
| 7. |
Tropospheric atmosphere is turbulent. Which of the following reasons can be attributed to this?A. Convectional current of air rises up due to high temperature in lower layers of the earth.B. Temperature changes result in change in air pressure.C. More effect of centrifugal force is more in this layer.D. None of these |
| Answer» Correct Answer - A::C | |
| 8. |
Identify the substance which continue to burn in an atmosphere of ` N_(2)`.A. FeB. MgC. CuD. W |
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Answer» Correct Answer - B Magnesium catches fire when its reacts with oxygen and continues to continues to burn in an atmosphere of `N_(2)`. |
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| 9. |
An increase in the levels of `CO_(2)` in the atmosphere increases the temperature of the earht. |
| Answer» Correct Answer - 1 | |
| 10. |
Arrange the layers of the atmosphere as per the following terms related in a sequence order respectively. Inversion layer, convertion currents, absorbs harmful radiations and burning up of meteorites (a) Troposphere (b) Stratophere ( c) Exophere (d) Mesosphere (e ) IonophereA. decabB. abcedC. baecdD. abdce |
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Answer» Correct Answer - C (i) Stratosphere (ii) Troposphere (iii) Ionosphere (iv) Exosphere (v) Mesophere |
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| 11. |
Identify the layers of atmosphere as per activites mentioned and arrange them in sequence. Burning up of meteorites, flying of aeroplances, rflection of radio waves, absorption of harmful ionizing radiations and occurrence of most of the weather phenomena. (a) Troposphere (b) Stratophere ( c) Mesosphere (d) Ionophere (e ) MegnetosphereA. bcdeaB. cbdeaC. cdeabD. bdaec |
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Answer» Correct Answer - B Burning of meteorites takes place in mesosphere, aeroplanes fly in stratophere, reflection of radio waves taken place in ionosphere. Magnetosphere absorbs ionizing radiations and most of the weather phenomena occurs in troposphere. |
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| 12. |
Identify the four layers of atmosphere as per the temperature range mentioned and them in a sequence. `60^(@)C" to "-15^(@)C" to "17^(@)C" to "-51^(@)C,-15^(@)C" to "-120^(@)C` and maximizing up to `2000^(@)C`. (a) Troposphere (b) Stratosphere ( c) Mesosphere (d) Exosphere ( e) ThermosphereA. baceB. abceC. bacdD. cabe |
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Answer» Correct Answer - A Stratosphere has temperature range of `-60^(@)C" to "-15^(@)C`, troposphere has temperature range of `17^(@)C" to "-51^(@)C`, mesosphere has temperature range of `-15^(@)C" to "-120^(@)C` and thermospher has a maximum temperature up to `2000^(@)C`. Bace. |
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| 13. |
Why is the temperature high in thermosphere? |
| Answer» Absorption of intense solar radiation. | |
| 14. |
Why is the atmospheric presure measured at sea level? |
| Answer» Atmosphere pressure is maximum. | |
| 15. |
Why does atmospheric pressure decrease with an increase in altitude? |
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Answer» (i) Density of air with altiude (ii) Factors which can affect atmospheric pressure. (iii) Changes in these factors in different altitudes. |
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| 16. |
Ozone present in ………… plays a role in protecting the life on surface from harmful UV rays.A. TroposphereB. stratosphereC. mesosphereD. ionosphere |
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Answer» Correct Answer - B Ozone presetn in stratophere plays a vital role in protecting the life on the earths surface form harmful UV rays. |
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| 17. |
`CO_(2)` can be used to preserve food grains from destruction by insects. |
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Answer» Correct Answer - 1 When food grains are kept in the atmosphere of carbon dioxide it prevents the grain from destruction by insects |
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| 18. |
`CO_(2)` can be clooected by the downward displacement of air. |
| Answer» `CO_(2)` can be collected by upward displacement of air as `CO_(2)`is denser than air. | |
| 19. |
Chemical formula of white lead is………….. |
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Answer» Correct Answer - `Pb(OH)_(2)*PbCO_(3)` Chemical formula of white lead is `Pb(OH)_(2)*PbCO_(3)` |
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| 20. |
Why is LPG a better fuel than coal? |
| Answer» LPG is a mixture of lowre hydrocarbons. It has very low ignition temperature and the heat evolved per unit mass of LPG called calorific value of the fuel is very high. Coal is an allotropic form fo carbon and as very high ignition temperature. Its calorific value is very low. Apart from these two reasons, LPG undergoes complete combustion and does not produce any ash. Burning coal produces ash and causes acid rain due to the presence of nitorgen and sulphur in it. | |
| 21. |
……… is used as a supporter of combustion in rockets ans space ships.A. Liquid hydrogenB. Liquid oxygenC. CokeD. Liquid carbon dioxide |
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Answer» Correct Answer - B Liquid oxygen is used as a supporter of combustion in rockets ans space ships. |
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| 22. |
Hydrogen sulphied from air is removed by passing air throughA. caustic potashB. concentrated `H_(2)SO_(4)`C. anhydrous `CaCl_(2)`D. filters |
| Answer» Correct Answer - A::C | |
| 23. |
Corbon dioxide from air is removed by passing air through _____.A. caustic potashB. concentrated `H_(2)SO_(4)`C. anhydrous `CaCl_(2)`D. filters |
| Answer» Carbon dioxide from air is removed by passing air through caustic potash. | |
| 24. |
Which of the following reactions is associated with the formation of a mirror like surface near the cooler part of the test tube?A. Heating of mercric oxideB. Heating of silver oxideC. Heating of tri-lead oxideD. Heating of lead dioxide |
| Answer» Heating of mercuric oxide is associated with the formation of mirror like surface near the cooler part of the test tube. | |
| 25. |
Which of the following reactions is associated with the formation of shining white globules?A. `2HgOoverset(Delta)to2Hg+O_(2)`B. `2Ag_(2)Ooverset(Delta)to4Ag+O_(2)`C. `2Pb_(3)O_(4)overset(Delta)to6PbO+4O_(2)`D. `2NaNO_(3)overset(Delta)to2NaNP_(2)+O_(2)` |
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Answer» Silver (i) oxide on heating forms silvery white globules. `2Ag_(2)Oto4Ag+O_(2)` |
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| 26. |
Arrange the products of the following reactions in the increasing order of the numbre of oxygen atoms associated with one nonmetallic atom. (a) Burning of phosphorus in an adequate supply of oxygen to produce and oxide of phosphorus. (b) The complete combustion of coke with the supply of sufficient oxygen. (c) An electric spark is provided to a 1 : 1 mixture of nitrogen and oxygen. (d) Burning of sulphur dioxide gas in oxygen.A. c d a bB. c b a dC. b c a dD. c b d a |
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Answer» (a) Burning of phosphorus gives `P_(2)O_(5)` (b) Complete combustion gives `CO_(2)` (c) When an electric spark is provided to a mixture 1 : 1 mixture of `N2andO_(2),NO` is produced. (d) Burning of `SO_(2)` gives `SO_(3)` `:.` The correct sequence is c b a d. Arrange the the statements in this order - (i), (ii), (iii), (iv). |
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| 27. |
When lime water is exposed to air for a long time, very thin white coating is found floating on the surface. Give reasons. |
| Answer» Air contains a low percentage of `CO_(2)`. Though `CO_(2)` turns lime water milky, since the amount of `CO_(2)` is less in the atmospheic air, it does not turn lime water milky. Only over a long period of exposure, a thin white film of `CaCO_(3)` is formed due to the minor amounts of `CO_(2)` in the atmospheric air. | |
| 28. |
Which of the following process is not associated with formation of metal nitrates in soil ?A. Acid rainB. Nitrogen fixation by leguminous plantsC. Lighteming followed preciptionD. Formation of auroras |
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Answer» Correct Answer - D Acid rain, nitrogen fixation and lighterning processes are associated with the formaion of metal `HNO_(3)` when reacts reacts with salts present in the soil, gets converted to corresponding metal nitrates. Formation of auroras involves collision of electrons with molecules of `N_(2)" ana "O_(2)` and emission of beautiful radiations. It does not result in formation of nitrates. |
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| 29. |
The body temperature of a healthy person is around `98.4^(@)F`. Justify. |
| Answer» Oxygen in the air is used for burning the fuel which gives energy in the form of heat. In the same way oxygen inhaled by us is used inside the tissues to break down the glucose and liberate energy in the form of heat. This liberated heat maintains the body temperature at `98.4^(@)F` | |
| 30. |
Soda water contains excess……… in dissolved state.A. `H_(2)`B. `CO_(2)`C. `N_(2)`D. `O_(2)` |
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Answer» Correct Answer - B Soda water contains excess of `CO_(2)` in dissolved state. |
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| 31. |
Assme that temperature is recorded in the termosphere with the help of a thermometer. You will be amazed to find that the temperature recorded in will be extremely low. This is becauseA. of the complete absorption of high energetic radiations by molecules.B. of the absence of atmosphere.C. of the presence of very few molecules of ions.D. it is very high altitudes. |
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Answer» Correct Answer - C Due to a very thin atmosphere in the termosphere, only a few molecules presetn here absorb high energetic rediations and hence the temperature of molecules of inons formed is great but the ambient temperature is very low. |
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| 32. |
Excess intake of `O_(2)` by a person results in several ill-effects. Which of the following activities leads to excess in take `O_(2)` ?A. Deep sea divingB. MountaineeringC. Travelling in an aeroplaneD. Walking on the moon |
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Answer» Correct Answer - A Due to increased pressure in the deep sea, more amount of oxygen gets dissolved in water this excessive intake of oxygen by a person affects and leads to several problems like nausea, dizziness etc. Hence a cylinder in which oxygen is diluted with inert gas like He has to be carred. |
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| 33. |
The CO that is added up to the atmosphere due to the incomplete combustion of fuels can be decreased by theA. usage of scrubberB. usage of electric precipitator.C. usage of catalytic convertor.D. increasing greenery. |
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Answer» Correct Answer - C Catalytic convrtors consists of ceramic honey comb like structures with platinum catalyst spred out. The increased surface are of the catalyst provides many reactive sites where the less oxidized products like CO and NO are converted to `CO_(2)" and "N_(2)` which are released into th eatmosphere. |
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| 34. |
You are asked to prepare oxygen from air after eliminating the impurities in the order that is at first dust particles then water vapour and `CO_(2)` at the end. Based on the given instruction arrange the processes given below in a sequence. (a) Passing the sample of air through concentrated NaOH (b) Repeated compression followed by sudden expansion (c) Fractional distillation of liquefied air (d) Passing the air through electrostatic precipitator (e) Passing the air through anhydrous `CaCl_(2)`A. a d e b cB. a c e b dC. d e a b cD. b a e d c |
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Answer» (i) Passing the air through electrostatic precipitator. (ii) Passing the air through anhydrous `CaCl_(2)`. (iii) Passing the air through concentrated NaOH solution . (iv) Repeated compression followed by sudden expansion. (v) Frational distillation of liquefied air. |
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| 35. |
Aeroplanes usually fly in the stratosphere becauseA. of the presence of ozone layer.B. of the atmosphere being turbulent.C. of the decrease in temperature with altitude.D. of the absence of convection current. |
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Answer» Correct Answer - D Aeroplanes fly in the stratosphere due to the absence of convection current. Because the temperature gradually increases with increases with increase in altitude due to the absorption of highly energetic UV radiations. Since there is no turbulence in the atmosphere of the stratosphere, aeroplanes usually fly in the stratosphere. |
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| 36. |
Arrange the following layers of the atmophere in the decreasing order of their altitudes. (a) Stratosphere (b) Troposphere ( c) Mesophere (d) Exosphere ( e) IonophereA. cdeabB. bacedC. dbecaD. decab |
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Answer» Correct Answer - D (i) Exosphere (ii) Ionosphere (iii) Mesophere (iv) Stratophere (v) Troposphere |
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| 37. |
A gas X when passed through blue litmus solution turns it red. Another gas Y when through either blue litmus or red litmus does not change the colour of the litmus. Identigy the true statement regarding X and Y.A. X is basic while Y is neutral.B. Y is neutral while X is acidic.C. Y is basic while X is acidic.D. Y is acidic while X is neutral. |
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Answer» Correct Answer - B X is an acidic gas since it changes blue litmus red. Y is neutral since it does respond to either red or blue litmus test. |
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| 38. |
Generally, a netal gets corroded due to oxidation. Name a metal which becomes chemically resistant due to oxiadation.A. ZincB. CopperC. AluminiumD. Iron |
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Answer» Correct Answer - C Aluminium, when exposed to the atmosphere, reacts with air, that is `O_(2)` and forms `AI_(2)O_(3)`. This layer of `AI_(2)O_(3)` (alumina) makes aluminium passive. |
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| 39. |
Which among the following gases do not contribute to green house effect ?A. MethaneB. Carbon dioxideC. Water vapourD. Nitrogen dioxide |
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Answer» Correct Answer - D Nitrogen dioxide present in the atmosphere does not contribute to acid rain. |
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| 40. |
Two non-metallic oxides A and B are produced by buring of fossil fuels. A pollutes both air are water. B does not cause water pollution and its presence in water is essential. It causes air pollution. Identify A and B.A. `NO_(2),SO_(2)`B. `SO_(2),CO`C. `SO_(2),CO_(2)`D. `CO_(2),NO_(2)` |
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Answer» Correct Answer - C A can be `SO_(2)" or "NO_(2)` because they pollute air and cause acid rain to pollute water. B can be `CO_(2)` since it does not cause acid rain. Its presence in water is essential for aquatic plants. It is considered as an air pollutant as it results in global warming. |
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| 41. |
`O_(2)" and "CO_(2)` prepared in the laboratory can be collected by ……….A. downward displacement of water and downward displacement of air respectivelyB. downward displacement of water and upward displacement of air respectivelyC. upward displacement 0f water in both casesD. downward displacement of water in both cases |
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Answer» Correct Answer - B `O_(2)` is collected by downward displacement of water and `CO_(2)` is collected by upward displacement of air. `O_(2)` is insoluble in water whereas `CO_(2)` in soluble in water. |
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| 42. |
Arrange the following steps involved in the prepartion of oxygen from `KClO_(3)` in proper order. (a) Content of the test tube is heated. (b) A mixture of finely ground `KClO_(3)andMnO_(2)` is taken in a test tube. (c) The open end of the test tube is plugged with cotton. (d) Delivery tube is taken out. (e) The test tube is fixed in a slanting position. (f) Bunsen burner is put off. (g) Oxygen is collected by downward displacement of water.A. b c d a e f gB. e f c b d a gC. a b c d f g eD. b c e a g d f |
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Answer» (i) A mixture of finely ground `KClO_(3)andMnO_(2)` is taken in a test tube. (ii) The open end of test tube is plugged with cotton. (iii) The test tube is fixed in a slanting position. (iv) Content of the test tube is heated. (v) Oxygen is collected by downward displacement of water. (vi) Delivery tube is taken out. (vii) Bunsen burner is put off. |
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| 43. |
`MnO_(2)` used as a catalyst in the preparation of oxygen from `KClO_(3)` should be completely free of carbon. Justify. |
| Answer» `MnO_(2)` usually contains coal as impurity. If such `MnO_(2)` is used, carbon when heated with potassium chlorate leads to an explosion with the release of enormous amount of heat since it is a highly exothermic reaction. | |
| 44. |
When ammonia is burnt in a limited supply of oxygen, which gas is evolved?A. NOB. `N_(2)O`C. `N_(2)`D. `NO_(2)` |
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Answer» When ammonia is burnt with limited amount of oxygen, it burns with blue flame with the evolution of nitrogen gas. `4NH_(3)+3O_(3)overset(Delta)to2N_(2)+6H_(2)O` |
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| 45. |
What would happen if people travel in a non-pressurized aeroplane? |
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Answer» (i) Pressure inside non-pressurized aeroplanes at higher altitudes. (ii) Comparison of pressure inside and outside a human body at sea level. (iii) Comparison of pressure in a human body and non-pressurized aeroplane. (iv) Effect of difference in pressure. |
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| 46. |
The ratio of `KClO_(3)andMnO_(2)` taken for the preparation oxygen isA. `4:1`B. `3:1`C. `2:1`D. `2:5` |
| Answer» 4 parts of `KClO_(3)` and 1 part of `MnO_(2)` on heating gives oxygen gas. | |
| 47. |
Why is mercury taken in a barometer? |
| Answer» Weak adhesive forces and high density. | |
| 48. |
Explain the construction and working of the (i) Mercury barometer (ii) Aneriod barometer |
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Answer» (i) Components (ii) Principle (iii) Construction (iv) Working |
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| 49. |
`FeS_(2)` on burning in oxygen gives _______. |
| Answer» `FeO,SO_(2)` | |