| 1 |
What happen to the atomic number of an element which emits one alpha particle? |
- A. Increase by 1
- B. Stays the same
- C. Decrease by 2
- D. Decrease by 1
|
| 2 |
The number of neutrons in the nucleus of tritium is: |
|
| 3 |
Who discovered the phenomenon of natural radioactivity? |
- A. Henry Becurial
- B. Merry Curi
- C. Perry
- D. Rutherford
|
| 4 |
<p class="MsoNormal">The value or current I passing through a conductor is
inversely proportional to:<o:p></o:p></p> |
- A. <p class="MsoNormal">Temperature<o:p></o:p></p>
- B. <p class="MsoNormal">Potential difference<o:p></o:p></p>
- C. <p class="MsoNormal">e.m.f.<o:p></o:p></p>
- D. <p class="MsoNormal">resistance<o:p></o:p></p>
|
| 5 |
The temperature at the centre of sun is. |
- A. 10 million k
- B. 20 million k
- C. 30 million k
- D. 35 million k
|
| 6 |
The reason carbon dating work is that. |
- A. Plants and animals are such strong emitters of carbon 14
- B. After a plant or animal dies, it stops in fresh carbon
- C. There is so much non radioactive carbon dioxide in the air
- D. When a plant or animal dies.
|
| 7 |
When 1 tonne of coal is burnt then amount of energy is released . |
- A. 36 x 10<sup>8</sup> J
- B. 36 x 10<sup>9</sup>J
- C. 36 J
- D. 36 x 10<sup>10</sup>J
|
| 8 |
The half life of argon nuclide Ar-40 is: |
- A. 2 x 10<sup>8 </sup>years
- B. 2 .2x 10<sup>8</sup>years
- C. 2.4x 10<sup>8</sup>years
- D. 2.8x 10<sup>8</sup>years
|
| 9 |
Radiation was found in: |
- A. 1896
- B. 1895
- C. 1897
- D. 1898
|
| 10 |
<p class="MsoNormal">The A.C used in Pakistan has frequency:<o:p></o:p></p> |
- A. <p class="MsoNormal">60 Hz<o:p></o:p></p>
- B. <p class="MsoNormal">30 Hz<o:p></o:p></p>
- C. <p class="MsoNormal">50 Hz<o:p></o:p></p>
- D. <p class="MsoNormal">130 Hz<o:p></o:p></p>
|
