(44) Correct answer: Option (1)

If we are starting to work from the A to B on the given line, we can find following observations.

1. We find the lake in between the contour of 900 feet elevation. Therefore in the cross section, it should be indicated the depression with gentle slope. Because the lake is find within the same elevation contour line.

2. Then elevation is gradually increases from the level of 900 to 1600 feet (height difference = 700 feet). However, the contours are drawn showing the considerable space in between each of them. It gives idea that the slope does not change rapidly on its elevation.

However, the slope from X to B has rapid change of its elevation. There is same elevation different (1600 to 900 feet = 700feet) at that slope, but contours drown more densely within that same elevation deference. It means changing of the elevation is more rapid than other side of the slope (A to X). Therefore in the cross-section this slope is indicated more sharply than the other slope.

Correct Answer: Option 3 – Gneiss

Gneiss is a banded rock formed during high-grade metamorphism. When the grade of metamorphism is very high, foliation is the commonest structure of the crystalline rocks; gneisses and schist of various kinds are the predominant rock types. A gneiss is thus essentially a banded or streaky rock in which the layers of differing mineral composition are relatively thick. Gneissose banding consist of more –or less regular alternations of schistose (Schist) and granulose (Granulite) bands. The schistose layers consist of micas and/or amphiboles. (Pyroxene is a rather rare constituent.) The granulose bands are essentially quartzo-feldspathic and may or may not show a preferred orientation. As the layers become thinner, gneiss grades into schist, in which the layers are extremely thin. Gneisses are generally fairly coarse –grained rocks.

Important points to stress include:

• Slate – Low grade regionally metamorphosed, argillaceous rocks which have developed a well marked cleavage but have suffered little recrystallisation, so that the rock is very fine grained.
• Dunite – An ultra basic, mono-mineralic rock consisting of more or less pure olivine.
• Quartzite –Sandstone when metamorphosed, turns into a massive rock called quartzite in which the original sand grains and the silica cement have recrystallized to new quartz grins.

Based on these arguments, the rest of the options are incorrect.

Correct Answer: Option (3) –Alpha Centauri

Alpha Centauri –Alpha Centauri is the brightest star in the southern constellation of Centaurs. It is the closest star system to the Solar System. It is being slightly larger and more luminous than our Sun. It has 1.519 Luminosity in Solar Units. Temperature is 5260-5790K.

Sun-Sun has the 1.0 Luminosity in Solar Units. Temperature is 5778 K.

Rigel - is a Blue super giant, shining with approximately 40,000 times the luminosity of the Sun.Temperature - 11,000 K.

Barnard’s Star - is a very low-mass red dwarf star approximately 6 light-years away from Earth in the constellation of Ophiuchus (the Snake-holder). Luminosity 0.0035 in solar units and temperature is 3,134+_ 102 K.

Aldebaran -is the brightest star in the constellation Taurus and one of the brightest stars in the night sky. Luminosity 0.00014 in solar units and Temperature is 3050-4100 K.