Which of the following device is used to check the purity of milk?
Hydrometer
Lactometer
Barometer
None of these
The narrow stem in hydrometer
Increase its sensitivity
Increase upthrust on it
Raises its centre of gravity
Increase its size
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
A hydrometer is used to measure the following quantity of a liquid.
Mass
Volume
Relative density
Density
Density of substance decrease when temperature
increases
decreases
no change
1st increase then decrease
Pick out the correct expression.
P = FA
P = F + A
The liquid pressure on a diver changes of the diver moves
Pressure increase
Pressure decreases
No change
First increases, then decrease
Relative density of silver is 10.5. What is the density of silver in SI unit?
10.5 × 103 kgm-3
10 kgm-3
10.5 kgm-3
10.3 kgm-3
The density of Cu is 8.9 gcm-3. Its RD is
0.89
8.9
0.089
.0089
SI unit of upthrust is
Pa
N
Kg
Kgm2
