Video summary

Rajasthan Computer Anudeshak Bharti 2026 | Rajasthan Geography Class – जलवायु Part 3 | Deendayal Sir

Main summary

Key takeaways

Educational

Main ideas & lessons (Climate of Rajasthan – “Jalvayu Part 3”, focused on Monsoon and Rainfall)

1) Time periods of seasons (relevant for climate answers)

  • Summer season: March to mid-June
  • Rainy season (Varsha): mid-June to September
  • Transition point:
    • After mid-June, monsoon winds arrive, bringing the rainy season

2) Key diagram/astronomy concept used for explanations

  • Equator
  • Tropic of Cancer
  • Tropic of Capricorn

Longest/hottest day logic:

  • When the Sun shines directly on Tropic of Cancer (around 21 June), it is the longest and hottest day (context: India/Northern Hemisphere).

Sun’s apparent movement is also used to explain the shifting development of wind systems (monsoon).

3) What controls rainfall in general (core “words”)

The rainy-season answer should be built around these linked factors:

  • Rainfall
  • Temperature
  • Air pressure
  • Monsoon winds

(These factors are treated as interconnected in the explanation.)

Methodology / instruction-style content from the video (as taught)

A) How to answer rainfall definition questions (step-by-step definition)

Definition of rainfall (“rain”):

  1. Water vapour (water in gaseous/steam form) goes into the atmosphere.
  2. Due to decrease in temperature, vapour condenses (condensation: turning into liquid/solid form; clouds form).
  3. Clouds form after condensation.
  4. Water then falls drop-by-drop to the ground → this phenomenon is called rainfall / rain.

B) How rainfall occurs (mechanism taught with an everyday analogy + terrain)

The teacher explains “how rain occurs” using:

  • Analogy: Throwing water against a wall — water spreads in different directions.
  • Mountain/hill collision idea:
    • When clouds move and hit a barrier/mountain (or elevated land), rainfall occurs there.
    • Different sides can receive different rainfall depending on airflow and elevation.
  • Key inference: Areas where clouds collide with terrain get more rain.

C) Relationship between temperature and air pressure (used to explain wind direction)

  • Inverse relationship:
    • High temperature → low air pressure
    • High air pressure → low temperature
  • Wind direction rule:
    • Winds move from high air pressure to low air pressure

D) Definition + origin/history of monsoon winds (as stated)

  • Monsoon winds (class definition):
    • Surface winds that change completely with seasons
  • Historical mention:
    • Arab geographer Al-Masudi is said to have mentioned monsoon winds.
  • Seasonal blowing direction (as taught):
    • 6 months: winds blow from land to sea
    • 6 months: winds blow from sea to land
  • Seasonal humidity logic:
    • In summer: sea-to-land winds bring humidity, supporting the rainy season.
    • In rainy/winter context, the land-to-sea direction is discussed as the contrasting pattern.

Detailed content: Arabian Sea Monsoon vs Bay of Bengal Monsoon (core for Rajasthan rainfall)

1) Big-picture monsoon structure

  • Overall monsoon is taught as the South-West monsoon (dominant rainy monsoon for India).
  • After crossing the equator and due to India being a peninsula, it splits into:
    • Arabian Sea branch
    • Bay of Bengal branch
  • Peninsula meaning (as defined): water on three sides (contrasted with an island: water on all four sides)

Arabian Sea Monsoon (for Rajasthan: where it enters and why rainfall patterns differ)

A) Origin/early arrival points (as taught)

  • The Arabian Sea monsoon:
    • First enters India via the Malabar Coast (Kerala) around ~1 June
  • It is said that the entry area does not rain much initially; rainfall increases after lifting/collision.

B) Role of Cardamom Hills (Kerala) and division into 3 branches

  • Cardamom Hills are on the Malabar Coast (Kerala).
  • When monsoon collides with these hills:
    • Rainfall occurs
    • The monsoon splits into three branches:
      1. Malabar coastal branch
      2. Narmada–Tapti valley branch
      3. Saurashtra coastal branch
  • The Malabar coastal branch is described as ending earlier by causing rain.

C) Arabian Sea monsoon entry into Rajasthan

  • Entry into Rajasthan via the Saurashtra coastal branch
  • Timing: around 15–16 June / mid-June
  • Entry district sequence:
    • Banswara → Dungarpur → Udaipur → Sirohi

D) Where maximum rainfall occurs (as taught for this branch)

  • Arabian Sea monsoon is said to bring maximum rainfall in Rajasthan:
    • Sirohi district (major rainfall/“stoppage” point)

E) Why Rajasthan doesn’t get uniformly heavy rain from Arabian Sea monsoon

  • Arabian Sea monsoon advances parallel to the Aravalli range
  • Because of this alignment, it doesn’t bring enough rainfall into Rajasthan
  • Moisture continues forward and is described as being more influenced by the wider monsoon narrative involving the Himalayan region.

Bay of Bengal Monsoon (for Rajasthan: eastern entry + rain shadow concept)

A) How Bay of Bengal monsoon is formed (as taught)

  • It is associated with monsoon flow coming from/through:
    • Arakan Mountains (Myanmar) into the Bay of Bengal system
  • It collides first with Arakan Mountains (Myanmar).
  • Then one part branches toward:
    • India, passing over Bangladesh

B) Extra high rainfall example used

  • Mawsynram / Cherrapunji (Meghalaya) is cited because:
    • the monsoon hits hills like Garo–Khasi–Jayanti from multiple sides → very high rainfall

C) Collision with Himalayas → heavy rainfall

  • After entering toward India, the Bay of Bengal monsoon collides with the Himalayan mountain range
  • Result taught:
    • Heavy rainfall where it collides

D) Entering Rajasthan and direction naming

  • Enters Rajasthan from the eastern direction
  • Also called:
    • “Purvaiya monsoon”
  • After entering, it collides with Aravalli and reduces across western Rajasthan.

E) Rainfall distribution inside Rajasthan (east vs west)

  • Main claim taught:
    • Higher rainfall in northeast/eastern Rajasthan
    • Less rainfall in north-west / western Rajasthan
  • Reason:
    • Aravalli creates a rain-shadow effect

F) Rain shadow explanation (explicit definition + concept)

  • Rain shadow region:
    • Clouds may remain, but rainfall does not occur
  • The Bay of Bengal moisture is said to deplete as it moves west, reducing rainfall.

G) Aravalli-related heights & example peaks (used for reasoning)

  • Aravalli range altitude mentioned: around ~900 meters
  • Example peaks/hills listed with heights:
    • Raghunathgarh (Sikar) ~1055 m
    • Malkhet (Sikar) ~1053 m
    • Lohagarh (Jhunjhunu) ~1000+ m
    • Kho Pahadi (Jaipur) ~920 m
  • Claim:
    • Monsoon hits these hills → rain occurs there more; beyond the range → less rain

H) Southern/eastern extension via plateau (Chota Nagpur Plateau) and Jhalawar

  • After hitting the Chota Nagpur plateau, a branch enters Rajasthan through Jhalawar district
  • This branch also causes rain in parts of southern Rajasthan

I) Final rainfall comparisons (as stated)

  • Maximum rainfall in Rajasthan: north-east (east side)
  • Minimum rainfall in Rajasthan: north-west / west side

Additional administrative/eligibility guidance mentioned briefly (not part of geography)

The teacher also provides recruitment/exam-related instructions:

  • Ensure results are out before exam/joining dates as per the notification.
  • If applying as “appearing,” but the marksheet is not ready at document verification, then priority may not be given.
  • Emphasis: having complete documents (especially the mark sheet) at verification time is important.

Speakers / sources featured

  • Speaker/teacher: “Deendayal Sir” (also shown as Deendayal Parik in subtitles)
  • Historical/geography source mentioned: Arab geographer Al-Masudi
  • Geographical references used (not as “speakers”):
    • Tropic of Cancer, Equator, Tropic of Capricorn
    • Cardamom Hills, Malabar Coast, Aravalli, Himalayas
    • Example places: Sirohi, Banswara, Dungarpur, Udaipur
    • Extreme rainfall example: Mawsynram / Cherrapunji
    • Arakan Mountains (Myanmar)

Original video