Valentina Tereshkova was the first woman to go into space. She was also the youngest woman ever to go to space. She was just 26 years old when she made her first flight into space.

The Amazon rainforest is the largest tropical rainforest in the world. The Amazon is the largest rainforest in the world. It is home to more than 30 million humans and one in ten known species in the world. The Amazon rainforest covers a vast area of 6.7 million square kilometres.

The means of measuring the humidity of the atmosphere are called hygrometers.

The means of measuring the humidity of the atmosphere are called hygrometers.

1. The proton was discovered by Rutherford. The name proton is derived from the Greek word protos meaning 'first'. The proton is a positively charged particle located in the nucleus of an atom, which was discovered by Ernest Rutherford in 1920. Rutherford proved in 1917 that the nucleus of the hydrogen atom (ie a proton) is present in the nuclei of all other atoms.

2. The nucleus of the atom was discovered by Ernest Rutherford in his famous gold foil experiment in the year 1911. The value of the particle is 1.6*10-19 C. To make an atom neutral, it has the same number of protons and electrons. He used the same concept to discover the proton.

1. The Gurmukhi script was created by the second Sikh Guru, Guru Angad (1539-1552) in the 16th century AD.

2. He was the second Sikh Guru after the death of Guru Nanak (1469-1539).

3. The Sikh religious book, Guru Granth Sahib or Adi Granth was written in this script.

Effective teaching of social science would require:

B.  Critical analysis of literary texts , howsoever old they may be.

D. Giving primacy to triangulation of sources.