Q29 of 58 Page 1

A student traces the path of a ray of light through a rectangular glass slab for four different angles of incidence. He very cautiously measures the angle i, angle rand the angle e. on analyzing his measurements, he is likely to draw the following conclusion:

When a ray of light travels through a glass slab, then angle of incidence is equal to the angle of emergence and also the angle of refraction of ray on going from glass to air is always less than the angle of incidence or angle of emergence because at this time, the light travels from a denser medium to a rarer medium.

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27

A student takes about 6 ml distilled water in four test tubes marked P, Q R and S. He dissolves sodium sulphate in P, potassium sulphate in Q, calcium sulphate in R and magnesium sulphate in S. After that he adds equal amount of soap solution in each test tube. On shaking these test tubes, he would observe a good amount of lather in the test tubes marked

 28

A student focused 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 30 cm, select the correct statement about the device X.

 30

For the refraction of a ray of light through a glass prism, the path of a ray of light is

Shown below:



The angle of incidence, the angle of emergence and the angle of deviation respectively have been represented by

 31

Slides of binary fission in amoeba and budding in yeast were given for observations to a group of students. Some of the observations reported by the group are given below:

I. Cytokinesis was observed in the yeast cell.


II. A chain of buds were observed due to reproduction in amoeba.


III. Single cell of amoeba and single cell of yeast were undergoing binary fission and budding respectively.


IV. Elongated nucleus was dividing to form two daughter nuclei in amoeba.


The correctly reported observations are: