12m3
10m3
8m3
5m3
Correct answer is B
Density (D) = \(\frac{mass}{volume}\)
\(\therefore Mass = Density \times volume\)
= \(0.4 \times 20 = 8kg\)
The initial volume = \(\frac{Mass}{\text{Initial density}}\)
= \(\frac{8}{0.8} = 10m^{3}\)
One special advantage of alcohol over mercury as a thermometric liquid is its?
low density
low freezing point
high specific
low boiling point
Correct answer is B
The low freezing point of alcohol, -115°c enable low temperatures to be measured. mercury freezes at 39°c, and cannot be used in countries like Russia where winter temperatures of -40°c are common
A hydrometer is an instrument used in measuring?
vapour pressure of a fluid
density of liquid
relative humidity of a liquid
relative density of a liquid
Correct answer is D
The instrument used in measuring relative density is hydrometer
a density bottle
an eureka can
a pipette
a burette
Correct answer is A
Since relative density = mass of substance
mass of equal volume of water relative density bottle should be used to determine the mass of the substance, and mass of an equal volume of water by filling the bottle with the powder and water respectively and weighed with the beam balance.
300 N
200 N
150 N
100 N
Correct answer is A
Thrust = pressure x area = 100 pa x 3 m2 = 300 N