Q. No.What is the difference between Jhum cultivation of earlier days and now a days?
(1) Time gap for the recovery of land is increased
(2) Time gap for the recovery of land is decreased
(3) Ash is not used as fertilizer anymore.
(4) No more forests are burn.
(1) Time gap for the recovery of land is increased
(2) Time gap for the recovery of land is decreased
(3) Ash is not used as fertilizer anymore.
(4) No more forests are burn.
Which of the following is not an outcome of deforestation?
(1) Enhanced CO2 concentration
(2) Disturbed hydrologic cycles
(3) Loss of Biodiversity, soil erosion
(4) Soil salinity
Consider the following statements:
| I. | Catalytic converters are fitted into automobiles for reducing the emission of poisonous gases. |
| II. | They convert unburnt hydrocarbons to CO2 and H2O, and CO and NO to CO2 and N2 respectively. |
| III. | Vehicles equipped with catalytic converters should use leaded petrol. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
Consider the following statements:
| 1. | The “bad” ozone is the ozone that is formed in the troposphere. |
| 2. | The “good ozone” in the stratosphere acts as a shield against harmful UV radiation. |
| 3. | UV-A radiations can cause skin cancers and snow-blindness cataracts. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
The following diagram shows the effect of sewage discharge on some important characteristics of a river. What can be A and B respectively?
| 1. | BOD and DO | 2. | DO and BOD |
| 3. | BOD and COD | 4. | COD and BOD |
The following diagram shows the working of an electrostatic precipitator. Identify the correct statement:
| 1. | A negative voltage ionizes the air around the wire that in turn ionizes the particles in the air stream. |
| 2. | They are able to remove about 75% of the particulate matter present in the exhaust from a thermal power plant. |
| 3. | The velocity of air between the plates must be rapid enough to allow electrostatic precipitation of the dust particles. |
| 4. | PM 2.5 dust particles are more easily removed by the electrostatic precipitator than larger sized particulate matter. |
In Jhum cultivation, what is the probable fertiliser?
(1) Cow dung
(2) Ash
(3) Compost
(4) Cattle excreta
Jhum cultivation causes deforestation in
(1) North western states of India
(2) South India
(3) North Eastern state of India
(4) North India
Which of the cultivation is responsible for deforestation?
(1) Slash and Burn Agriculture
(2) Jhum Cultivation
(3) Both A and B
(4) Cyclic Agriculture
Which of the following statements is not correct?
(1) At the beginning of the twentieth century, forests covered about 30% of the land of India
(2) By the end of the twentieth century, forest area shrunk to 21.54%
(3) According to National Forest Policy of India has recommended 33% forest cover for the plains.
(4) According to National Forest Policy India(1982) has recommended 76% forest cover for the hills
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