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- Question
Excessive use of which ofthe following fertilizers may be responsible for the presence of a toxic substance in groundwater?
Options- A. Nitrogen
- B. Phosphate only
- C. Potassium only
- D. Phosphate and potassium
- Correct Answer
- Nitrogen
ExplanationExcessive use of nitrate including manure may be responsible forthe presence of toxic substance in groundwater. Phosphate can also enter the groundwater via excessive use of fertilizers. High application rates of nitrogen containing fertilizers combined with the high-water solubility of nitrate, leads to increased runoff into surface water as well as leaching into groundwater, thereby causing groundwater pollution.
Only a fraction of the nitrogen-based fertilizers, is converted to produce and other plant matter. Nitrate pollution in groundwater comes from pit latrines, it can cause blue baby syndrome.
- 1. Dolomite power is applied in some agricultural lands. The purpose of applying it is to
Options- A. increase the pH of the soil
- B. lower the pH of the soil
- C. increase the phosphorus content of the soil
- D. increase the nitrogen content of the soil Discuss
- 2. Which one of the following air pollutants combines with the haemoglobin of human blood and reduces its oxygen-carrying capacity, leading to suffocation and may cause even death?
Options- A. Chlorofluorocarbon
- B. Fly ash
- C. Carbon monoxide
- D. Sulphur dioxide Discuss
- 3. The HIV virus weakens the immunity of a person because it destroys
Options- A. mast cells
- B. platelets
- C. erythrocytes
- D. lymphocytes Discuss
- 4. Which one of the following is most sensitive to environmental change?
Options- A. Amphibian
- B. Reptile
- C. Mammal
- D. Insect Discuss
- 5. Which one of the following gases is released mostly from landfills in urban areas?
Options- A. Nitrogen
- B. Hydrogen
- C. Methane
- D. Oxygen Discuss
- 6. With reference to earthquakes, which of the following statements are correct? A. Earthquakes largely occur along the converging plate boundaries. B. Point of origin of earthquake in lithosphere is known as focus/hypocenter. C. Intensity of earthquake decreases with distance from the epicenter. D. Epicentre of earthquake always remains over continents only. Select the correct answer using the code given below.
Options- A. 1 and 2 only
- B. 1, 2 and 3
- C. 2 and 3 only
- D. 1 and 4 Discuss
- 7. ?Altitude sickness? is caused at high altitude due to
Options- A. high partial pressure of oxygen
- B. low partial pressure of oxygen
- C. low level of haemoglobin
- D. high partial pressure of carbon dioxide Discuss
- 8. The elemental composition of an adult human body by mass is
Options- A. C > O > H > N
- B. O >C >H > O
- C. N > C > O > H
- D. None Discuss
- 9. Which of the following statements concerning atmosphere of the Earth are correct? 1. In stratosphere, temperature increases with altitude. 2. In mesosphere, temperature decreases with altitude. 3. The lowest temperature of the atmosphere is recorded in the upper part of mesosphere. 4. Tropopause is an isothermal zone. Select the correct answer using the code given below.
Options- A. 1 and 2 only
- B. 1, 2 and 3 only
- C. 3 and 4 only
- D. 1, 2, 3 and 4 Discuss
- 10. Which one of the following statements is not correct?
Options- A. Position of the sun, Earth and Moon in a straight line of 180oangle is known as syzygy.
- B. Syzygy conjunction causes solar eclipse.
- C. Syzygy opposition causes lunar eclipse.
- D. Syzygy conjunction occurs at the time of perihelion only. Discuss
General Science problems
Search Results
Correct Answer: increase the pH of the soil
Explanation:
Dolomite is a limestone compound that contains calcium and magnesium. It provides valuable nutrients to plants and helpschange the pH of the soil by raising it to match the plants' needs. It evenprovides more nutrients than straight lime. It is often used in addition to balanced fertilizers, particularly with seeding fruit.
Correct Answer: Carbon monoxide
Explanation:
Carbon monoxide (CO) is very dangerous because it binds with the haemoglobin more efficiently than oxygen does. It "hogs the seats" so that oxygen can't get a ride. And those CO molecules keep riding around, never giving their seats up to the oxygen. This means there is no way to get oxygen to the brain, heart, or other cells and those cells start to die. And finally, it leads to suffocation and even death of a person.
Correct Answer: lymphocytes
Explanation:
The HIV virus continuously invades and destroys T-cells (lymphocytes). Eventually the body can't replace the T-cells fast enough, and the immune system deteriorates. When the immune system has deteriorated to the point that it is unable to fight off diseases, a person is diagnosed with AIDS.
Correct Answer: Amphibian
Explanation:
Amphibians are one of the most sensitive groups to change, whether that is caused by habitat loss, invasive species, disease, trade or climate change. Their sensitivity to environmental threats has been generally linked to the observation that amphibians are characterized by a rather permeable skin. Given their complex life cycles and other traits, amphibians are often recognized as indicators of ecosystem health.
Correct Answer: Methane
Explanation:
Decomposing waste in the landfills, by the action of microorganisms, produce methane and carbon dioxide. Landfill gas consists of 40-60% of methane and rest is carbon dioxide. Trace amount of volatile organic compounds (<1) are also present which mainly comprise of hydrocarbons.
Correct Answer: 1, 2 and 3
Explanation:
Epicentre of Earthquakes can be over both oceanic and continental surface. Epicentres above oceanic surface are cause of tsunamisof large intensity. Anearthquake's hypocentreis the position where the strain energy stored in the rockis first released, marking thepointwhere the fault begins to rupture.
Correct Answer: low partial pressure of oxygen
Explanation:
Altitude sickness, the mildest form being acute mountain sickness (AMS), is the negative health effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation.
Correct Answer: O >C >H > O
Explanation:
Correct Answer: 1, 2, 3 and 4
Explanation:
In troposphere and mesosphere, temperature declines with increasing altitude. In stratosphere and thermosphere, temperature increases with increasing altitude.The coldest temperatures in Earth?s atmosphere occur at the top of mesosphere, the Mesopause, especially in the summer near the pole.Transitional layers of atmosphere include tropopause, stratopause, and mesopause. These layers are relatively thin and are located between major layers of atmosphere. These have contrasting thermal properties. Hence, in these layers there is no change in temperature with change in altitude.
Correct Answer: Syzygy conjunction occurs at the time of perihelion only.
Explanation:
In astronomy, a syzygy is a straight-line configuration of three or more celestial bodies in a gravitational system.Solar and lunar eclipses occur at times of syzygy, as do transits and occultations.
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