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Physical Geography (UPSC) (Part-I)

📆 March 4, 2025

Total Questions: 50

11. Daily weather map showing isobars is an example of: [1997]

Correct Answer: (b) Isopleth map
Solution:Daily weather map showing isobars is an example of an isopleth map.
Isopleth maps show an imaginary surface by means of lines joining points of equal values.

12. The group of small pieces of rock revolving round the sun between the orbits of Mars and Jupiter are called: [1997]

Correct Answer: (d) asteroids  
Solution:The asteroids are a group of small pieces of rock revolving around the sun between the orbit of Mars and Jupiter. They are approximately 40,000 in number.

13. If the earth's direction of rotation is reversed, what should be the IST when it is noon at the International Date Line? [1997]

Correct Answer: (a) 06.30 hrs
Solution:The earth rotates on its axis from west to east direction and in this condition, the international standard time at 82½° longitude is ahead by 5:30 hours from the International Date Line (180°).
Since 1° = 4 minutes, the Indian Standard Time at 97½° longitude will be 18:30 hours (6 hours 30 minutes ahead).
If the earth starts rotating from east to west, the time difference would reverse accordingly.

14. Which one of the following stars is nearest to the Earth? [1997]

Correct Answer: (c) Sun
Solution:The sun is the star nearest to the earth. It is 150 million kilometers away from Earth. The sun has temperatures of over 15 million °C.

15. Which one of the following conditions is most relevant for the presence of life on Mars? [1997]

Correct Answer: (c) Occurrence of ice caps and frozen water
Solution:Mars is the only planet with similar daytime temperatures and an atmosphere similar to Earth.
The most relevant condition for the presence of life on Mars is the occurrence of ice caps and frozen water.

16. Consider the map given below: [1997]

Of the four shaded areas in the map, which is characterised by hot dry summers, mild and moist winters and seasonal reversal of winds.

Correct Answer: (a) 1
Solution:In the given world map ‘1’ refers to the hot, dry summers, and mild and moist winters in California (U.S.A.), characteristic of the Mediterranean type of climate.

17. Consider the following statements regarding asteroids: [1998]

1. Asteroids are rocky debris of varying size orbiting the sun

2. Most of the asteroids are small but some have diameter as large and 1000 km

3. The orbit of asteroids lies between the orbits of Jupiter and Saturn Of these statements:

Correct Answer: (c) 1 and 2 are correct
Solution:The asteroids are a group of small pieces of rocky debris of different sizes. Some asteroids are small, while some asteroids even have a diameter of 1000 km. The asteroids revolve between Mars and Jupiter.

18. Match the rivers labelled A, B, C and D on the given map with their names given in the list and select the correct answer using the codes given below the lists: [1998]

 

1. St. Lawrence

2. Orinoco

3. Mackenzie

4. Amazon

5. Yukon   

ABCD
(a)4321
(b)5312
(c)5413
(d)3142

Correct Answer: (b)
Solution:

In the given diagram of North America and South America:

‘a’ marked river is Yukon

‘b’ marked river is Mackenzie

‘c’ marked river is St. Lawrence

‘d’ marked river is Orinoco.

19. The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is: [1998]

Correct Answer: (c) Troposphere, Stratosphere, Mesosphere, Ionosphere
Solution:

The correct sequence of different layers of the atmosphere from the surface of the Earth is Troposphere, Stratosphere, Mesosphere, and Ionosphere.

Troposphere extends up to 8 km from the Earth's surface, but at the equator, it is 16-18 km.

Stratosphere extends above the troposphere from 18-50 km.

Mesosphere extends up to 80 km, and above the mesosphere,

Ionosphere is present, which extends up to 400 km

20. Estuaries possess distinct blooms of excessive growth of a pigmented dinoflagellates. These blooms are called [1998]

Correct Answer: (a) red tides
Solution:

  • Red tides are a special type of blooms, which are found at the estuaries. These blooms are pigmented dinoflagellates. These single celled organisms are able to swim short distances. When the algae is present in high concentration, the water appears purple or pink in colour .

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