Q15 of 25 Page 22

Take a small cotton ball and place it in a tumbler/ bowl filled with water. Observed it for at least 10 minutes. Will it float or sink in water and why?

i. The cotton ball is lighter than water.


ii. First, when it is placed in water, it starts to float on the surface.


iii. But after 10 mins, it absorbs water. As a result, it becomes heavier than water.


iv. Thus, it will sink in water after 10 mins.


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13

Mixtures of red chili powder in water, butter in water, petrol in water, and honey in water were given to Radha, Sudha, Softa, and Raveena, respectively. Whose mixture is in solution form?

 14

On a bright sunny day, Shikha was playing hide and seek with her brother. She hid herself behind a glass door. Do you think her brother will be able to locate her? If yes, Why? If no. why not?

 16

Which among the following materials would you identify as soft materials and why?

Ice, Rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapatti.

 17

You are provided with the following materials- turmeric, honey, mustard oil, water, glucose, rice flour, groundnut oil.

Make any three pairs of substance where one substance is soluble in the other and any three pairs of substances where one substance remains insoluble in the other substances.