Question Discussion & Solution

CONCEPT:

• Plane mirror: This mirror is straight without any inward or outward curve.
  • It forms a virtual image and upright image which is of size as same as the object.
  • The bathroom mirrors are an example.
• Concave mirror: The mirrors curved inside on the reflecting side are called concave mirrors.
  • These mirrors produce a real, inverted, and magnified image of the object.
  • These are used in reflecting telescopes, shaving mirrors, and ophthalmoscope.

• Convex mirror: It is an outward curved mirror that produces a diminished image.
  • Convex mirrors either diverge a parallel beam of light into all directions or gather light from all directions and produce a parallel beam out of it.

EXPLANATION:

• Following are the reasons as to why a convex mirror is used as a rearview mirror in the vehicle

• The image formed by the convex mirror is virtual and erect in contrast to that of the real but inverted image of the concave mirror.
• It gathers light from all directions and aligns it as a parallel beam so that it provides a wider view to the viewer. That's why the convex mirror is used as a rear-view mirror in vehicles. So option 2 is correct.

The pattern is:

31

31 × 2 + 1 = 63;

63 × 2 - 2 = 124;

124 × 2 + 3 = 251;

251 × 2 - 4 = 498

Hence, the answer is '498'.

The correct answer is First.

• In the year 2017-18, Rajasthan was the largest millet producing state of India.

Key Points

• Rajasthan was followed by Maharashtra and Karnataka.
• The year 2023 will be observed as the International Year of Millets. 
• The Central Government declared 2018 as the year of millets. 
• Millet Mission comes under the National Food Security Mission (NFSM) which was launched in October 2007. 
• Millets include Jowar and ragi etc.

Additional Information 

• Types of Crops in India:
  • Kharif: Sown in June/July, harvested in September/October, e.g., rice, jowar, bajra, ragi, maize, cotton, and jute.
  • Rabi: Sown in October/December, harvested in April/May, e.g., wheat, barley, peas, rapeseed, mustard grains.
  • Zyad: They are raised between April/June, e.g., melons, watermelons, cucumbers, toor, leafy and other vegetables.

The correct answer is Jodhpur.

• The 'Central Arid Zone Research Institute (ICAR)' of Rajasthan is located in Jodhpur.

Key Points

• Central Arid Zone Research Institute (ICAR):
  • It was established by the Government of India in 1959.
  • Its current director is Dr. O.P. Yadav.
  • This institute does arid zone research and development.  
  • It comes under the Indian Council of Agricultural Research.
  • ICAR comes under the aegis of the Ministry of Agriculture and Farmers Welfare.

Concept-

• When the functioning of one or more organs or systems of the body is adversely affected, characterized by various signs and symptoms, we say that we are not healthy, i.e., we have a disease.
• Diseases can be broadly grouped into infectious and non-infectious.
• Diseases that are easily transmitted from one person to another, are called infectious diseases.
• Infectious diseases are very common and every one of us suffers from these at some time or other. Some of the infectious diseases like AIDS are fatal.
• Non-infectious disease cancer is the major cause of death.

Important Points

• Hepatitis B is a liver disease that is caused by the hepatitis B virus (HBV).
• The virus is known to interfere with the functions of the liver and cause pathological damage.
• It can be both acute or chronic disease.
• HBV is spread by contact with the blood or body fluids of an infected person.

Explanation-

• Human beings have been abusing the water bodies around the world by disposing of them all kinds of waste.
• We tend to believe that water can wash away everything not taking cognizance of the fact that the water bodies are our lifeline as well as that of all other living organisms.
• Sewage from our homes as well as from hospitals is likely to contain many undesirable pathogenic microorganisms.
• Its disposal into the water without proper treatment may cause an outbreak of serious diseases, such as dysentery, typhoid, jaundice, cholera, etc.

Therefore Hepatitis-B is not a contaminated water disease.

Mistake Points

• Jaundice and Hepatitis B are not the same.
• Hepatitis B is a disease, while jaundice is a symptom.
• Jaundice symptom can be caused by many different reasons and Hepatitis B is just one of them. It can also be caused due to contaminated water.

Additional Information

Jaundice

• Jaundice can spread through contaminated water.
• It is a disease caused due to the accumulation of bilirubin in the blood and blood tissues.
• The disease causes yellowish discoloration of the skin, eyes, and other mucous membranes. 
• It is common in newborn babies because the newborn’s liver is not fully developed.
• Symptoms of Jaundice are fever, abdominal pain, weight loss, drowsiness, vomiting, etc.

Cholera

• Cholera is an acute diarrhoeal disease that can kill within hours if left untreated.
• It is caused due to the consumption of contaminated food or water.
• The provision of safe water and sanitation is critical to control the transmission of cholera and other waterborne diseases.
• It is caused by the bacterium Vibrio cholera.
• People may feel pain in their abdomen, nausea, vomiting, or watery Diarrhoea.
•