IGCSE Physics Paper-1: Specimen Questions with Answers 35 - 37 of 149
Question 35
Question
MCQ▾Which one of the child has minimum weight?
Three Children Comparing Their Weights with See-Saw
Choices
| Choice (4) | |
|---|---|
| a. | Y |
| b. | Z |
| c. | X |
| d. | Question does not provide sufficient data or is vague |
Answer
c.Explanation
Here from given figure one can conclude that
From first figure in weight Y > Z
From second figure Y > X
And from third figure Z > X
So, from all three results one can write
Therefore X has minimum weight.
Question 36
Question
MCQ▾How amount of water becomes half if cold water is put on burner and allowed to remain there for 1 hour?
Choices
| Choice (4) | |
|---|---|
| a. | convection |
| b. | conduction |
| c. | radiation |
| d. | evaporation |
Answer
d.Explanation
A tank of cold water put on burner and after 1 hour the volume of water inside the tank is half then its actual volume because of heat half of the liquid molecules of water transformed in to gaseous state. This process is called evaporation.
Question 37
Question
MCQ▾Which radiations are stopped by a plastic?
Choices
| Choice (4) | |
|---|---|
| a. | X-rays |
| b. | β- particles |
| c. | α- particles |
| d. | γ- rays |
Answer
b.Explanation
As we know that β- rays are fast moving electrons.
They typically have energies in the range of a few hundred KeV to several MeV.
Since electrons are might lighter than helium atom they are able to penetrate further, through several feet of air but it can be stopped by several millimeter of plastic.