Physics 10th Class English Medium Unit 9 Online Test With Answers

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Physics 10th Class English Medium Unit 9 Online Test

Sr. # Questions Answers Choice
1

When we double the voltage in a simple electric circuit, we double the:

 <p class="MsoNormal">Current<o:p></o:p></p> <p class="MsoNormal">Power<o:p></o:p></p> <p class="MsoNormal">Resistance<o:p></o:p></p> <p class="MsoNormal">Both a and b<o:p></o:p></p>
2 The half life of radium 226 is 1600 year 1610 years 1620 years 1630 years
3 For observing how fast plants are absorbing phosphate fertilizer we use. I.131 Ph -32 Co-60 Ar-40
4 The half of carbon 14 is 5720 years 5730 years 5740 years 5750 years
5 Radioactive isotopes present in atmosphere is Cobalt -60 Ph-32 Carbon -14 Carbon -20
6 Nuclear fission was first observed in 1936 1937 1938 1939
7 When 1 tonne of coal is burnt then amount of energy is released . 36 x 10<sup>8</sup> J 36 x 10<sup>9</sup>J 36 J 36 x 10<sup>10</sup>J
8 When 1 kg of Uranium -235 is fused then energy released is 67 x 10<sup>10</sup> J 67 x 10<sup>7</sup>J 67 J 7 J
9 The half -life of carbon is 5730 years 5700 years 5720 years 572 years
10 The half life of Lead Pb is 10 hour 10.10 hours 10.6 hours 1 year
11 The temperature at the centre of sun is. 10 million k 20 million k 30 million k 35 million k
12 The reason carbon dating work is that. Plants and animals are such strong emitters of carbon 14 After a plant or animal dies, it stops in fresh carbon There is so much non radioactive carbon dioxide in the air When a plant or animal dies.
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