Geography MCQ Questions with answers

The Indira Gandhi Canal is the longest irrigation canal in India, with a total length of 650 km.

It originates from the Harike Barrage in Punjab and provides irrigation to the Thar Desert region of Rajasthan.

This canal has transformed arid regions of Rajasthan into fertile agricultural lands.


Other Options Explained:

(A) Sirhind Canal – A major canal in Punjab, but not the longest.

(B) Yamuna Canal – Important for irrigation but shorter than Indira Gandhi Canal.

(D) East Kosi Canal – Provides irrigation to Bihar but is not the longest.


Thus, the correct answer is (C) Indira Gandhi Canal.

Loktak Lake is the largest freshwater lake in Northeast India and is famous for the phumdis floating over it. The lake is located at Moirang in Manipur state, India. The etymology of Loktak is Lok = "stream" and tak = "the end".

The Western Ghats are higher in the southern region and gradually decrease in elevation as they extend northward.

Anai Mudi (2,695 m) in Kerala is the highest peak in the Western Ghats.

The Tapi River flows south of the Satpura range, and both the Narmada and Tapi rivers flow through rift valleys.


Other Options Explained:

(B) Tapi river lies to the South of Satpura → Correct

(C) Anai Mudi is the highest peak in the Western Ghats → Correct

(D) The Narmada and Tapi river valleys are old rift valleys → Correct


Thus, the incorrect statement is (A) The Western Ghats are relatively higher in their Northern region.

Cosmic radiation is higher at higher altitudes because there is less atmospheric shielding.

Among the given cities, Delhi has the highest elevation above sea level (~216 m), compared to:

Chennai (~6 m)

Mumbai (~14 m)

Kolkata (~9 m)


Since cosmic radiation intensity increases with altitude, Delhi receives the highest cosmic radiation among the four cities.

Homoseismal lines is the line on the Earth's surface
connecting points where the seismic wave arrives,
generated by an earthquake, at the same time.

Mangrove wetlands are possible sinks/sources for carbon dioxide and other related greenhouse gases. Global warming may promote expansion of mangrove forests to higher latitudes. Elevated CO2
concentration
may increase mangrove growth by stimulating photosynthesis or improving water use efficiency.

There are droplets of sulphuric acid and acidic crystals in
the atmosphere of Venus. The smooth surfaces of these
droplets of sulfuric acid and crystals reflect light very
well, which is one reason why Venus is so bright.

Astronomy is the scientific study of celestial bodies such as stars, planets, comets, galaxies, and the universe as a whole.

It involves observing and understanding the motion, composition, and properties of these celestial objects.


Other Options Explained:

(A) Astrology → A belief system that claims celestial bodies influence human life (not a science).

(B) Astronautics → The science of space travel and spacecraft design.

(D) Astrophysics → A branch of astronomy that studies the physical and chemical properties of celestial bodies and cosmic phenomena.


Thus, the correct answer is (C) Astronomy.

Although Mercury is the closest planet to the Sun, it does not have an atmosphere to trap heat. As a result, its temperature varies greatly between day and night.

Venus, on the other hand, has a thick atmosphere made of carbon dioxide, which causes an intense greenhouse effect, trapping heat and making it the hottest planet in the solar system.

The surface temperature of Venus can reach around 467°C (872°F), which is hotter than Mercury.


Other Options Explained:

(A) Mercury → Closest to the Sun but lacks an atmosphere to retain heat (~430°C in the daytime, but drops to -180°C at night).

(C) Mars → Much colder due to a thin atmosphere (~-63°C on average).

(D) Jupiter → A gas giant with no solid surface and much lower temperatures.


Thus, the correct answer is (B) Venus.

Venus is called the "Morning Star" and also the "Evening Star" because it is the brightest planet visible in the sky just before sunrise and just after sunset.

It shines brightly due to its thick atmosphere, which reflects a lot of sunlight.


Other Options Explained:

(A) Mercury → Sometimes visible near sunrise or sunset but not as bright as Venus.

(C) Mars → Known as the "Red Planet," not a morning star.

(D) Jupiter → A bright planet but not called the morning star.


Thus, the correct answer is (B) Venus.