Question

Vibha placed a metallic cuboid of mass 12kg and dimensions 40cm × 30cm × 10cm on the loose sand. The maximum and minimum pressure exerted by the cuboid on the sand respectively would be:

a. 3000Pa and 1000Pa
b. 4000Pa and 1000Pa
c. 4000Pa and 3000Pa
d. 4000Pa and 2000Pa.

Answer 1

let l :40cm 
b: 30 cm 
h : 10 cm 

lh : 400 cm2 
hb: 300 cm2(minimum area ) 
300/10000 m2 

bl : 1200 cm2(maximum area) 
1200/10000 m2 


now, 
pressure:: force maximum or minimum area 

force :mass acceleration due to gravity 
mass:12 kg 
acceleration :10m/s 

minimum pressure: m a /maximum area 
so 121010000/1200 
1000 pascal 
similarly maximum pressure:ma/minimum area 
so 121010000/300 
so 4000 pascal 
your ans is max. pressure4000 and mini..pressure
1000 so b is the right

Answer 2

b is the correct option.......
hope it helps