Advertisements
Advertisements
प्रश्न
Consider the statement given below and choose the correct option.
Assertion: Water strider slides easily on the surface of the water.
Reason: Water strider experiences less buoyant force.
पर्याय
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason are true, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Both assertion and reason are false.
Advertisements
उत्तर
If both assertion and reason are true, but reason is not the correct explanation of assertion
Correct explanation:
It is due to the surface tension of water.
APPEARS IN
संबंधित प्रश्न
Name the scientist who gave he magnitude of buoyant force acting on a solid object immersed in a liquid.
Fill in the blank with suitable word :
It is the................. force which makes objects appear lighter in water.
The density of a body which sinks in water is ......... than 1000 Kg m-3.
- Calculate the height of a water column which will exert on its base the same pressure as the 70 cm column of mercury. Density of mercury is 13.6 g cm-3.
- Will the height of the water column in part (a) change if the cross-section of the water column is made wider?
Two cylindrical vessels fitted with pistons A and B of area of cross-section 8 cm2 and 320 cm2 respectively are joined at their bottom by a tube and they are completely filled with water. When a mass of 4 kg is placed on piston A, Find:
- the pressure on piston A,
- the pressure on piston B, and
- the thrust on piston B.
A body experiences an upthrust F1 in river water and F2 in sea water when dipped up to the same level. Which is more, F1 or F2? Give reason.
A body weighs 450 gf in air and 310 gf when completely immersed in water. Find
(i) The volume of the body,
(ii) The loss in weight of the body, and
(iii) The upthrust on the body.
State the assumption made in part (i).
Two spheres A and B, each of volume 100 cm3 is placed on water (density = 1.0 g cm−3). The sphere A is made of wood of density 0.3 g cm−3 and sphere B is made of iron of density 8.9 g cm−3.
- Find:
- The weight of each sphere, and
- The upthrust on each sphere.
- Which sphere will float? Give reason.
The blood pressure reading of a patient is recorded 160/100. Express the lower pressure in SI units.
[Take density of mercury as 13.6 × 103 kgm−3 and the value of ‘g’ as 10 ms−2]
Write about buoyant force.
