force of gravity, solids and fluids - Category wise Question and Answer Practice Test with Solutions

Question : 21

Purity of a metal can be determined with the help of

a) Archimedes principle

b) Boyle's law

c) Pascal's law

d) Conservation of mass principle

Question : 22 [CDS]

Dirty cloths containing grease and oil stains are cleaned by adding detergents to water. Stains are removed because detergent

a) increases the viscosity of water and oil

b) increases the surface tension between water and oil

c) reduces drastically the surface tension between water and oil

d) decreases the viscosity in detergent mixed water

Question : 23

Kerosene oil rises up in a wick of lantern because of

a) diffusion of oil through the wick

b) buoyant force

c) capillarity

d) None of the above

Question : 24 [CDS]

In scuba-diving, while ascending towards the water surface, there is a danger of bursting the lungs. It is because of

a) Gay-Lussac's law of combining volumes

b) Boyle's law

c) Archimedes' principle

d) Graham's law of diffusion

Question : 25 [IAS Prelim]

Consider the following statements : If there were no phenomenon of capillarity

1. it would be difficult to use a kerosene lamp
2. one would not be able to use a straw to consume a soft drink
3. the blotting paper would fail to function
4. the big trees that we see around would not have grown on the Earth

a) 2 and 4 only

b) 1, 3 and 4 only

c) 1, 2 and 3 only

d) 1, 2, 3 and 4