Q 1 . Consider the following statements:
1 . Tides are of great help in navigation and fishing.
2 . High tide enables big ships to enter or leave the harbour safely.
3 . Tide prevents siltation in the harbours.
4 . Kandla and Diamond Harbour are tidal ports.
Which of these statements are correct?
(a) 1 and 4
(b) 2, 3 and 4
(c) 1, 2 and 3
(d) 1, 2, 3 and 4
Answer : (d) EXPLANATION : All the given statements are true
Q 2 . Consider the following statements made about sedimentary rocks:
1 . Sedimentary rocks are formed at earth’s surface by the hydrological system
2 . Formation of sedimentary rocks involves the weathering of preexisting rocks
3 . Sedimentary rocks contain fossils
4 . Sedimentary rocks typically occur in layers
Which of these statements are correct?
(a) 1 and 2
(b) 1 and 4
(c) 2, 3 and 4
(d) 1, 2, 3 and 4
Answer : (d) EXPLANATION : All the statements are true about the sedimentary rock.
Q 3 . Identify the correct order of the process of soil-erosion from the following:
(a) Splash erosion, Sheet erosion, Rill erosion, Gully erosion
(b) Sheet erosion, Splash erosion, Gully erosion, Rill erosion
(c) Rill erosion, Gully erosion, Sheet erosion, Splash erosion
(d) Gully erosion, Rill erosion, Sheet erosion, Splash erosion
Answer : (a) EXPLANATION : The correct order of soil erosion process is splash erosion, sheet erosion, rill erosion and gully erosion. Splash occurs when the raindrop hits the surface; explosive impact breaks the soil into individual particles. Sheet erosion is the detachment of soil particles by rain drop and their removal down slope by water flowing overland as a sheet in definite channels. Rill erosion refers to the development of small ephemeral concentrated flow paths which function as both sedimentary source and sediment delivery systems for erosion on hill slopes. Sheet erosion removes the this top layer by raindrop . When the rills are deeper than 30 cm and form channels, it is called as gully erosion. Gully erosion occurs when water flows in narrow channels after heavy rain and melting snow.
Q 4 . Assertion (A) : 60° – 65º latitudes in both the hemispheres have a low pressure belt instead of high pressure.
Reason (R) : The low pressure areas are permanent over oceans rather than on land.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer : (c) EXPLANATION : A is true but R is false. Sub-polar low pressure is located between 60–65 degree latitude in both hemisphere. Low pressure is produced in this area, because the surface air spreads outward from this zone due to rotation of earth.
Q 5 . Assertion (A) : The surface winds spiral inwards upon the centre of the cyclone.
Reason (R) : Air descends in the centre of the cyclone.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is NOT a correct explanation of A
(c) A is true but R is false
(d) A is false but R is true
Answer : (a) EXPLANATION : Air begins to slowly descend in the centre of the storm, creating a rain-free area. This is a newly formed eye. On land, the centre of the eye is, by for, the calmest part of the storm.
Q 6 . Which one of the following is the continent with the highest mean elevation in the world?
(a) Antarctica
(b) North America
(c) Asia
(d) South America
Answer : (a) EXPLANATION : Antarctica is the highest continent on the planet with an average elevation of 7,545 feet above sea level. The elevation of Antarctica at the south pole is 9,300 feet.
Q 7 . If the earth’s direction of rotation is reversed, what should be the IST when it is noon at the International Date Line?
(a) 06.30 hrs
(b) 05.30 hrs
(c) 18.30 hrs
(d) 17.30 hrs
Answer : (a) EXPLANATION : The earth rotates on its axis from west to east direction and in this condition the , the Indian standard time at 82½° longitude is ahead by 5:30 hours. Because 1° = 4 minutes. According to question, if the direction of rotation of earth is reversed i.e. The earth starts to rotate from east to west direction, at that time if it is 12 o’clock at noon at International Date Line (180°) then exactly at that time Indian standard Time which is at the distance of 97½° from international Date Line (180° longitude), will be 18.30 hour. Since 1° longitude = 4 minutes So, 97½° × 4 = 390 minutes = 6.30 hours (difference)
Q 8 . Which one of the following conditions is most relevant for the presence of life on Mars?
(a) Atmospheric composition
(b) Thermal conditions
(c) Occurrence of ice caps and frozen water
(d) Occurrence of ozone
Answer : (c) EXPLANATION : Mars is the only planet with similar day time temperatures and an atmosphere similar to earth. The most relevant condition for presence of life on Mars is occurrence of ice caps and frozen water.
9 . About 50% of the world population is concentrated between the latitudes of :
(a) 5°N and 20° N
(b) 20°N and 40°N
(c) 40ºN and 60ºN
(d) 20ºS and 40ºS
Answer (b) EXPLANATION : About 50% of the world population is concentrated between latitude of 20°N and 40°N, because most populous countries and areas like Asia, U.S.A, Europe and India lies with in this latitude.
10 . “…..They are people of yellow complexion, oblique eyes, high check bones, sparse hair and medium height.” The reference here is to :
(a) Nordic Aryans
(b) Austrics
(c) Negroids
(d) Mongoloids
Answer (d) EXPLANATION : Mongloids are inhabitants of northern, eastern and south-east Asia. Their eyes have a characteristic fold of skin on the upper lid, hair is straight and the height is medium. The group also includes the Chinese, Japanese, Burmese, Thais, Vietnamese and Malays.
