The outer most layer of Sun is known as___________
1). Chromosphere
2). Photosphere
3). Radioactive zone
4). Corona
3. Panthera Tigris is the scientific name of
5. Total surface area of a cube is 486 sq cm, find sum of length of all its edges?
7. If $ p^{2}+q^{2}=7 pq$ , then the value of $\frac{a}{b}+\frac{b}{a}$ is equal to?
8. Select the related word/letters/number from the given alternatives.170 : 13 : : 257 : ?