| 1 |
The concept of orbit was used by:<br> |
- A. J.J Thomson<br>
- B. Rutherford<br>
- C. Bohr <br>
- D. Planck <br>
|
| 2 |
According to Bohr, electrons can revolve only in this orbits whose angular momentum is |
- A. h/2π
- B. n 2h/π
- C. n h2/2π
- D. n h/2π
|
| 3 |
Deuterium is used to make:<br> |
- A. light water <br>
- B. heavy water<br>
- C. soft water<br>
- D. hard water<br>
|
| 4 |
Which of the following can accommodate 18 electrons? |
|
| 5 |
The no.of neutrons in deutrium is |
|
| 6 |
Which radioisotope is used for the diagnosis of tumor in the body?<br> |
- A. cobalt-60<br>
- B. iodine-131<br>
- C. strontium-90<br>
- D. phosphorus-30<br>
|
| 7 |
The lowest energy level is |
|
| 8 |
"Atoms" means _________ |
- A. Divisible
- B. Indivisible
- C. Break
- D. Nil
|
| 9 |
Energy of a shell is ________________ |
- A. Variable
- B. Constant
- C. Cannot be changed
- D. Nil
|
| 10 |
________________ proposed that matter is composed of small particles. |
- A. Greek
- B. English's
- C. Russian
- D. Nil
|