science 12 grade

Question: Define atomic mass of an element. Answer: The atomic mass of an element is the relative mass of its atom as compared to the mass of C - 12 atom taken as 12 unit..

The nucleus of an atom of an element contains 11 protons and 12 neutrons. Determine the atomic number and mass number of the elemen..

Animal charcoal (or Bone charcoal) is obtained by destructive distillation of bones. It contains about 10-12% of amorphous carbo..

Question: Avogadro number represents the number of atoms in ________. 1. 12 grams of 12 C 2. 320 grams of sulphur 3. 32 grams of oxygen 4. 1 gram of 12 C Answer: ..

This breed is a native of Kaira and Vadodara districts of Gujarat. The average yield is 1600 to 1800 litres. The fat content is about 8-12%. This breed is highly adaptabl..

The human heart is a muscular, cone-shaped, hollow organ about the size of a fist (about 12cm in length and 9cm in breadth..

Calcium carbonate = CaCO 3 Ca = 40, C = 12, O = 16GMM = 1 x 40 + 1 x 12 + 3 x 16= 40 + 12 + 48 = 100..

India has 12 major river basins and 8 composite river basins that form the surface water resource. Besides, the ground water also adds to the total water resourc..

This is conservation of living resources within the natural ecosystem in which they occur. This is acheived by protection of natural habitat and maintenance of endangered species in certain protected areas such as national parks, wild life or bird sanctuaries and biosphere reserves. In India, ther..

Question: In water, hydrogen and oxygen are present in the ratio of ________. 1. 1:8 2. 2:12 3. 2:3 4. 1:2 Answer: ..