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- Question
The HIV virus weakens the immunity of a person because it destroys
Options- A. mast cells
- B. platelets
- C. erythrocytes
- D. lymphocytes
- Correct Answer
- lymphocytes
ExplanationThe 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.
- 1. Which one of the following is most sensitive to environmental change?
Options- A. Amphibian
- B. Reptile
- C. Mammal
- D. Insect Discuss
- 2. Which one of the following gases is released mostly from landfills in urban areas?
Options- A. Nitrogen
- B. Hydrogen
- C. Methane
- D. Oxygen Discuss
- 3. Limonitic ore is the ore of which metal?
Options- A. Iron
- B. Aluminium
- C. Zinc
- D. Cobalt Discuss
- 4. Term ?Visible Horizon? in astronomy is defined as:-
Options- A. The circle of contact of the earth and the cone of visual rays passing through the meridian of the place.
- B. The circle of contact of the earth and the cone of visual rays not passing through the meridian of the place.
- C. The circle of contact of the earth and the cone of visual rays passing through the point of observation.
- D. The circle of contact of the earth and the cone of visual rays not passing through the point of observation. Discuss
- 5. The largest source of pollution in the world is
Options- A. herbicides and insecticides
- B. Automobile exhausts
- C. Sewage and garbage
- D. Industrial effluents Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. ?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
General Science problems
Search Results
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: Iron
Explanation:
Limonite is one of the two principal iron ores, the other being hematite, and has been mined for the production of iron.
Correct Answer: The circle of contact of the earth and the cone of visual rays passing through the point of observation.
Explanation:
Visible Horizon is the circle of contract, with the earth, of the cone of visual rays passing through the point of observation.
Correct Answer: Sewage and garbage
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: 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: Nitrogen
Explanation:
Excessive 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.
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.
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