Question : An oil drop spreads over water because:
Option 1: oil is lighter than water.
Option 2: oil is more viscous.
Option 3: oil does not mix with water.
Option 4: surface tension of oils is much smaller than that of water.
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Correct Answer: surface tension of oils is much smaller than that of water.
Solution : The correct option is surface tension of oil is less than that of water.
The surface tension of water causes oil droplets to disperse over it. Water has a higher surface tension than oil, therefore when oil is spilt over it, the water's higher surface tension pushes the oil in all directions, causing it to spread throughout the water. But oil only spreads when it comes into touch with the water's surface at a specific angle. As droplet size and interfacial tension increase, so does the maximum spreading length of oil droplets.
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Question : Which of the following statements is not correct about surface tension?
Option 1: Surface tension is typically measured in dynes cm.
Option 2: The shape of the water drop is spherical due to surface tension.
Option 3: At room temperature, the surface tension of water is less than ethyl alcohol.
Option 4: The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
Question : Directions: There are eight persons, A, B, C, D, E, F, G and H, all having different weights. Only two persons are lighter than F. F is heavier than A but lighter than B. D is lighter than E but heavier than G. H is lighter than A. C is heavier than E. C is not the heaviest person. The weights of the second heaviest and the second lightest persons are 78 kg and 48 kg, respectively. How many persons are lighter than the person who is just lighter than D?
Option 1: One
Option 2: Three
Option 3: Four
Option 4: Two
Question : Surface water is a better source of drinking water because it is poor in
Option 1: Dust
Option 2: Bacteria
Option 3: Arsenic
Option 4: Algae
Question : The surface tension of water on adding detergent to it:
Option 1: increases
Option 2: decreases
Option 3: no change
Option 4: becomes zero
Question : What does it mean when an object has a positive charge?
Option 1: It has more electrons than protons.
Option 2: It has more protons than electrons.
Option 3: It has more neutrons than electrons.
Option 4: It has more neutrons than protons.
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