1. 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
(a) 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 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 kill or orion occurs in lines which are less than 30 cm deep when these rills are deeper than 30 forming channels are called as gully erosion. Gully erosion occurs when water flows in narrow channels after heavy rain and melting snow.
2. Assertion (A) : During the neap tides. The high tide is lower and the low tide is higher than usual.
Reason (R) : The neap tide, unlike the spring tide, occurs on the new moon instead of on the full moon.
(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
(c) The sun, the earth and the moon come in the position of quadrature (form-a right angle) on seventh and eighth day of every fortnight of a month and thus the tide producing forces of the sun and the moon works in opposite direction, causing low tide. This is lower in height than the normal tide and is called neap tide. But the spring tide occurs during full moon and are called high tides.
3. Sun's halo is produced by the refraction of light in:
(a) water vapour in Stratus clouds
(b) ice crystals in Cirro-Cumulus clouds
(c) ice crystals in Cirrus clouds
(d) dust particles in Stratus clouds
(c) Sun halo also known as 22 degree halo, the ring is caused by sunlight passing through ice crystals in cirrus clouds with in the Earth's atmosphere.
4. Consider the following statements:
1. Ocean currents are slow-surface movement of water in the ocean.
2. Ocean currents assist in maintaining the Earth's heat balance
3. Ocean currents are set in motion primarily by prevailing winds
4. Ocean currents are affected by the configuration of the ocean
Which of these statements are correct?
(a) 1 and 2
(b) 2, 3 and 4
(c) 1, 3 and 4
(d) 1, 2, 3 and 4
(b) Ocean currents are not slow most of the time and can be subsurface current also. So, statement '1' is wrong. But '2', '3' and '4' statements are correct
5. Consider the following statements :
1. In equatorial regions, the year is divided into four main seasons
2. In Mediterranean region, summer months receives more rain.
3. In China type climate; rainfall occurs throughout the year
4. Tropical highlands exhibit vertical zonation of different climates
Which of these statements are correct?
(a) 1, 2, 3 and 4
(b) 1, 2 and 3
(c) 1, 2 and 4
(d) 3 and 4
(d) 1st statement is wrong: Equational region has only two seasons.
2nd statement : Mediterranean gets rainfall during winter season is also wrong.