Q29 of 48 Page 1

Select from the following the best set-up for tracing the path of a ray of light through a rectangular glass slab:

The correct answer is: option (a)

The path of ray should be properly inclined on the surface of the slab. This is best in figure 1:


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27

Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.

1. Calcium Sulphate


2. Sodium Sulphate


3. Calcium Chloride


4. Potassium Sulphate


5. Sodium Hydrogen Carbonate


6. Magnesium Chloride

 28

A student focussed the image of a distant object using a device 'X' on a white screen 'S' as shown in the figure. If the distance of the screen from the device is 40 cm, select the correct statement about the device.

 30

In an experiment to trace the path of a ray of light through a glass prism for different values of angle of incidence a student would find that the emergent ray:

 31

Select the correct statements for the process of budding in yeast:

I. A bud arises from a particular region on a parent body.


II. A parent cell divides into two daughter cells, here the parental identity is lost.


III. Before detaching from the parent body a bud may form another bud.


IV:. A bud when detaches from the parent body grows into a new individual,