Relative density of a substance is expressed by comparing the density of that substance with the density of
Air
Mercury
Water
Iron
Density of substance decrease when temperature
increases
decreases
no change
1st increase then decrease
Larger the volume of body submerged in fluid, the upthrust will be
Same
Less
Greater
Cannot predict
Density of water is
1000 gcm-3
1 kgm-3
1 gcm-3
None of these
Pick out the most accurate expression.
P = hρg
P = Ahρg
The gravitational unit of thrust in CGS system is
N
gf
kgf
dyne
The liquid pressure on a diver changes of the diver moves
Pressure increase
Pressure decreases
No change
First increases, then decrease
The density of Cu is 8.9 gcm-3. Its RD is
0.89
8.9
0.089
.0089
A swimming pool has dimension 20m × 3m. When it is filled water, what is the force on bottom?
5.880 × 106N
0
4.41 × 105N
8.82 × 105N
The narrow stem in hydrometer
Increase its sensitivity
Increase upthrust on it
Raises its centre of gravity
Increase its size
