CMAT Chemistry Questions

(A) The crust of the Earth comprises rocks rich in Silica and Aluminium. This is CORRECT. The Earth’s crust is primarily made of silicate rocks containing elements like silicon and aluminium, often referred to as sial.

(B) The core of the Earth consists of metals in a liquid state at high temperature and pressure. This is CORRECT. The outer core is liquid, mainly composed of iron and nickel, while the inner core is solid despite high temperatures due to immense pressure.

(C) Magnesium and Phosphorus are dominant in the core of the Earth. This is NOT CORRECT. The core is dominated by iron and nickel, not magnesium or phosphorus, which are more abundant in the mantle and crust.

(D) The Hydrosphere covers approximately 71% of the total surface area of the Earth. This is CORRECT. About 71% of the Earth’s surface is covered by water, forming the hydrosphere, while the remaining 29% is land.

(A) Temperature -> (III) Kelvin (K)

Temperature is a fundamental physical quantity that measures the degree of hotness or coldness of a body. Its SI unit is the Kelvin (K). 

(B) Mass -> (I) Kilogram (kg)

Mass is a fundamental physical quantity that measures the amount of matter in an object. Its SI unit is the Kilogram (kg). 

(C) Electric current -> (IV) Ampere (A)

Electric current is a fundamental physical quantity that measures the flow of electric charge. Its SI unit is the Ampere (A). 

(D) Length -> (II) Meter (m)

Length is a fundamental physical quantity that measures the extent of an object or the distance between two points. Its SI unit is the Meter (m).