Question Discussion & Solution

The correct answer is 20 August, 1949

Key Points

• Rajasthan Public Service Commission was established on 20 August 1949.
• At the time of formation of Rajasthan, the institution of Public Service Commission existed in only three of the 22 covenanting states viz. Jaipur, Jodhpur and Bikaner.
• The successor administration after the merger of the princely states promulgated an ordinance on 16th August, 1949 establishing the Rajasthan Public Service Commission Ajmer which was published in Rajasthan Gazette at 20th August, 1949.
• Rajasthan Public Service Commission came into effect on 22 December, 1949.

Additional Information

• Rajasthan Board of Secondary education was set up on 4 December, 1967.
• Union Public Service Commission was set up on 1 October, 1926.
• Staff Selection Commission was set up on 4 November, 1975.

CONCEPT:

• Frequency (f): The number of waves that pass a given point per second is called frequency.
  • The unit of frequency is vibration per second or Hertz.

• Time period (T): The time taken to complete one full oscillation or cycle by the Wave is called the time period.

  • The SI unit of the time period is second (s).

EXPLANATION:

• From the above table, it is clear that time is the physics quantity that has the same unit in both C.G.S and the M.K.S system.

The correct answer is Deforestation.

• Deforestation is not related to conservation of land resources.

Key Points

• The felling and clearing of forest cover or tree plantations to accommodate agricultural, industrial or urban use is Deforestation.
• Deforestation can also be seen as removal of forests leading to several imbalances, both ecologically and environmentally.
• According to the Global Forest Resources Assessment 2020 (FRA 2020) report, the rate of forest loss has declined in the period of 1990-2020.
• The world’s total forest area is 4.06 billion hectares (bha), which is 31% of the total land area.

Additional Information

• The FRA is released by the United Nations Food and Agriculture Organization (FAO).
• Restriction on overgrazing is done to reduce Negative effects of grazing which include overgrazing, increased soil erosion, compaction and degradation, deforestation.
• Land reclamation is the process of creating new land from oceans, seas, riverbeds or lake beds.
• Regulated use of fertilizer controls the movement of water and nutrients within the plant.

The correct answer is caffeine.

Caffeine is the main active constituent of tea and coffee.
Additional Information

• Caffeine works by stimulating the central nervous system (CNS), heart, muscles, and the centres that control blood pressure.
  • Caffeine can raise blood pressure, but might not have this effect on people who use it all the time.
  • Caffeine can also act like a “water pill” that increases urine flow.
• Nicotine works by stimulating our nervous system to release specific chemical messengers (hormones and neurotransmitters) that affect different parts of our brain and body.
  • One hormone that nicotine affects is epinephrine, also known as adrenaline.
• Chlorophyll is a green pigment found in plants.
  • Plants use chlorophyll and light to make food.
  • People sometimes use chlorophyll as medicine.
  • Common sources of chlorophyll used for medicine include alfalfa, algae, and silkworm droppings.

CONCEPT:

• The pressure cooker is based on the principle that the boiling of water increases with the increase in pressure.

EXPLANATION:

• When we give heat to the pressure cooker then due to an increase in temperature the steam generated in the vessel.
• Due to this generated steam, the pressure inside the vessel increases. So the food gets cooked soon.
• Thus by the application of pressure the boiling point of the water increases. Hence option 1 is correct.
• There is no relation between food-grains with the boiling point of water. So options 2, 3, and 4 are wrong.