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- Question
Which of the following is an air pollutant?
Options- A. Sulphur dioxide
- B. Ozone
- C. Water vapour
- D. Nitric oxide
- Correct Answer
- Sulphur dioxide
ExplanationAir pollutants are solid particles, gases, and liquid droplets in the air that can adversely affect ecosystems and the health of humans.
Major ambient air pollutants include toxic metals, polycyclic aromatic hydrocarbons, benzene, particulate matter (PM), nitrogen oxides, sulfur oxides, carbon monoxide, and ozone. Power plants, factories, and vehicle and air traffic are the most important anthropogenic sources of air pollution.
In addition, natural sources such as wildfires and volcanic activity contribute to ambient air pollution.
- 1. The shadow zone exists because Discuss
- 2. Which term best describes how the solar system formed?
Options- A. Electrically
- B. Gradually
- C. Chemically
- D. Rapidly Discuss
- 3. The hot holding temperature for potentially hazardous foods must be
Options- A. not less than 60 deg
- B. less than 60 deg
- C. less than 5 deg
- D. None of the above Discuss
- 4. What type of macromolecule is DNA?
Options- A. Proteins
- B. Carbohydrates
- C. Nucleic acids
- D. All of the above Discuss
- 5. What gas makes up most of the atmosphere?
Options- A. Oxygen
- B. Helium
- C. Nitrogen
- D. Carbondioxide Discuss
- 6. Which is a density independent factor in controlling a population?
Options- A. Food shortage
- B. Disease
- C. Floods
- D. All of the above Discuss
- 7. What structure separates the thoracic cavity from the abdominal cavity?
Options- A. Diaphragm
- B. Liver
- C. Lungs
- D. Heart Discuss
- 8. For purifying drinking water alum is used
Options- A. TRUE
- B. FALSE Discuss
- 9. Alcohol has many sensations and effects like
Options- A. loss of concentration
- B. dizziness
- C. nausea
- D. All of the above Discuss
- 10. Calcium absorption is facilitated by the presence of
Options- A. Vitamin D
- B. Vitamin C
- C. Vitamin A
- D. Vitamin K Discuss
General Science problems
Search Results
Correct Answer: The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core There are two types of Shadow zones: one for P waves and one for S waves P wave shadows between 104-140 degree, both sides; S wave shadow from 105 of one side to 105 of the other
Correct Answer: Gradually
Correct Answer: not less than 60 deg
Explanation:
Potentially hazardous foods are foods that might contain food poisoning bacteria and are capable of supporting growth of these bacteria or formation of toxins to levels that are unsafe for consumers, if the foods are not stored at correct temperatures. Toxins are poisonous chemicals produced by some types of bacteria.
The food can be left at room temperature until it reaches 60 deg C because food-poisoning bacteria will not multiply at 60 deg C or above. However, do not leave food cooling at room temperature unless you are sure that the temperature of the food is still at least above 60 C.
Correct Answer: Nucleic acids
Explanation:
DNA stands for Deoxyribo nucleic acid. It is a nucleic acid made up of monomeric unit called Nucleotide.
A nucleotide consist of -
a) Sugar - Deoxyribose in DNA ( ribose in RNA)
b) An organic base- Adenine, cytosine, guanine.
Correct Answer: Nitrogen
Explanation:
Our atmosphere is made up of
78% Nitrogen,
21% Oxygen and
1% all other gases like argon, carbon dioxide, neon, and helium.
So, Nitrogen makes up the majority of our atmosphere.
Correct Answer: Floods
Explanation:
Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population, then such factor is called Density Independent Factor. It is things that the organisms have no control over.
Here in the given options, food shortage and disease are factors that are dependent on the number of population but Floods have no dependency.
Some examples of density independent factors are :: Earth quake, fires, volcanic eruptions, floods, and all natural calamities.
Correct Answer: Diaphragm
Correct Answer: TRUE
Explanation:
In purifying drinking water alum is used for coagulation of mud particles.
Correct Answer: All of the above
Explanation:
Alcohol has many sensations and effects like dizziness, nausea and loss of concentration.
Correct Answer: Vitamin D
Explanation:
The presence of vitamin D in the body enhances the absorption of calcium by the intestine.
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