PHYSICS :

1. The best conductor of electricity……………

Ans : Salt water

2. Which is good nuclear fuel ?

Ans : Plutonium-239

3. Old-written material, which can’t be read easily, can be read by……….

Ans : infrared-rays

4. What is the wavelength of visible spectrum ?

Ans : 3900-7600A

5. Nuclear fission is caused by the impact of ……………..

Ans : neutron

6. Mesons are found in ………………….

Ans : cosmic rays

7. Optical fibers are mainly used for …………….

Ans : communications

8. Which is used as a moderator in nuclear reactor?

Ans : Graphite

9. The wavelength of X-rays is of the older of ………………….

Ans : 1 Angstrom

10. Who laid the foundation of nuclear science in the country ?

Ans : Homi J. Bhabha