Physics - Study Mode

[#166] In ________ motion of a body its velocity varies with time.
Correct Answer

(D) Non-uniform

Explanation

Solution: In non-uniform motion of a body its velocity varies with time.

[#167] Which of these liquids has the highest viscosity?
Correct Answer

(B) Syrup

Explanation

Solution: Syrup has the highest viscosity.

[#168] The absorption of ink by blotting paper involves
Correct Answer

(C) Capillary action phenomenon

Explanation

Solution: The absorption of ink by blotting paper involves capillary action phenomenon because the blotting paper is a thin and a smooth paper which allows a little thicker liquids like ink to absorb.

[#169] Water from soil enters into the root hairs owing to :
Correct Answer

(B) Capillary pressure

Explanation

Solution: In plants, the transpiration stream is the uninterrupted stream of water, and other, which is taken up by the roots and, via the xylem vessels, transported to the leaves where it will eventually evaporate into the air/apoplast-interface of the substomatal cavity. It is driven in by capillary action and in some plants root pressure. The main driving factor is the difference in water potential between the soil and the substomatal cavity caused by transpiration.

[#170] A small drop of oil spreads over water because :
Correct Answer

(B) Water has a higher surface tension

Explanation

Solution: Surface tension of oil is smaller than that of water. When oil is dropped on the surface of water, the force stretches the oil drops on all sides. Hence the oil spreads over the surface of water.