1. 'Blue baby syndrome' is due to the presence of which of the following in the blood?
Answer: Option B) Methemoglobin
Explanation:
The presence of methemoglobin in the blood causes a disease called 'blue baby syndrome'. Hemoglobin changes into methemoglobin and reduces the oxygen supply in the body, which causes cyanosis (i.e. blue discoloration of the skin) in the body. It affects infants more than adults. When the oxygen level drops too much, the affected person goes into a coma and if there is no improvement, death is also possible.
2. Site of gaseous exchange in lungs is
Answer: Option D) Alveoli
Explanation:
The site of gaseous exchange in the lungs is the alveoli or alveoli. Alveoli are called the structural and functional unit of the respiratory system. When a person breathes through the nose, the air goes into an organ called trachea in the throat, which is also called the windpipe. Further, the trachea gets divided into many parts, which are called bronchial tubes. Inside the bronchioles, there is an air sac, which is called alveoli.
3. Which of the following vitamins is essential for normal vision?
Answer: Option D) Retinol
Explanation:
Retinol (vitamin A) is essential for normal vision. Its deficiency can lead to problems like scaling of cornea and skin cells, night blindness, stunted growth, keratomasia, etc. Milk, butter, egg, liver, fish oil, spinach, etc. are the main sources of vitamin A.
4. Riboflavin deficiency causes which of the following diseases?
Answer: Option C) Cheilosis
Explanation:
ŕ¤Cheilosis is a disease caused by deficiency of vitamin-B2 (riboflavin). Other diseases caused by deficiency of this vitamin are cracking of skin, redness of eyes, cracking of tongue. Vitamins are complex organic compounds which control the actions of catalysts in metabolic reactions of the body. They are used as supporting bases. Beri-Beri disease - occurs due to deficiency of vitamin B1 (thiamine). Scurvy disease - occurs due to deficiency of vitamin-C (ascorbic acid). Pellagra disease - is a disease caused by deficiency of vitamin B3 (nicotinamide or niacin).
5. In which of the following years, the Environment (Protection) Act passed by the Government of India?
Answer: Option B) 1986
Explanation:
The Environment Protection Act was passed by the Government of India in the year 1986. Under this Act, a nationwide program has been created for the prevention, control and abatement of environmental pollution. It is worth noting that the Forest Conservation Act, 1980, Wildlife Protection Act, 1972 and Biodiversity Act, 2002 have been in effect.
6. 'World Ozone Day' is celebrated on
Answer: Option C) 16th September
Explanation:
World Ozone Day is celebrated every year on 16 September. The theme of Ozone Day celebrated in the year 2021 - "Montreal Protocol - We have to keep our food and vaccines cool." The ozone layer in the atmosphere is like a protective shield, which protects the Earth from harmful ultraviolet rays emanating from the sun. On December 19, 1994, the United Nations General Assembly decided to celebrate September 16 as International Ozone Day and the first World Ozone Day was celebrated in the year 1995.
7. The symbol 'ECOMARC' is related to which of the following?
Answer: Option B) Safe goods for environment
Explanation:
Ecomark certificate is given by Bureau of Indian Standards. This certificate is given to the product which is environmentally safe and does not have any negative impact on the ecosystem. Since 1991, the Government of India has introduced eco-labeling for easy identification of environmentally friendly products to increase consumer awareness.
8. Flyash pollution is caused by
Answer: Option C) Thermal power plant
Explanation:
Flyash is a particle emitted from thermal power plants which contains a considerable amount of oxides of silica, aluminum and calcium. Elements like arsenic, boron, chromium and lead are also found in trace amounts which pose a serious threat to the environment and health. This is why the government tries to set up thermal power plants and industrial units away from human settlements and is promoting renewable energy to reduce dependence on it. Along with this, afforestation is also being promoted.
9. Diffusion of light in the atmosphere takes place due to
Answer: Option B) Dust particles
Explanation:
When light passes through a medium which contains dust particles and other very minute particles of matter, light gets spread in the atmosphere (more in some directions and less in some directions) by these particles. This phenomenon is called scattering of light or propagation of light.
10. Which one of the following is the main constituent of LPG?
Answer: Option C) Methane
Explanation:
The main components of LPG are butane and propane gases. The full form of LPG is liquefied petroleum gas. Ethyl mercaptan (CH3-CH2-SH) is added to it for odor so that leakage can be detected. It is used as fuel.
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