Match the columns: 1. Mass a. relative density bottle 2. Volume b. lactometer 3. Sea breeze c. Eureka can 4. Density of milk d. physical balance 5. Relative density e. convection currents

For 1 , match is d. Physical balance is used for the measurement of mass. It is used to find out the mass of the unknown substance. Physical balance only works in the presence of gravity. For 2 , match is c. The volume of the irregular objects can be found out using Eureka can. The displaced water is measured using a measuring cylinder. By finding the mass of the object, the density of the object can be found using the measured volume. For 3 , match is e. During the day, the land becomes hotter and the air above it heats up. As the temperature increases, the density of the air decreases, so it rises up. Hence, cold air above the sea blows towards land causing a sea breeze. For 4 , match is b. Lactometer is used to check the purity of the milk. It is nothing but a hydrometer which gives the relative density of liquids. For 5 , match is a. Relative density bottles determine liquid densities by measuring the difference between an empty and filled bottle and dividing by an equal volume of water which gives the relative density of a substance. 1. Mass d. physical balance 2. Volume c. Eureka can 3. Sea breeze e. convection currents 4. Density of milk b. lactometer 5. Relative density a. relative density bottle

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q C

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On multiplying the relative density by $1000$ , one gets the density of a substance in $kg m^{- 3}$ .

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Important Questions on Physical Quantities and Measurement

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q C

A body of density $3.5 g / {cm}^{3}$ will float on water.

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q C

The base of the bulb of the hydrometer is filled with lead so that the hydrometer can float in a horizontal position.

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q C

Convection currents occur due to differences in density in different sections of a liquid or gas.

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q C

A land breeze arises due to the differential heating between land and water surfaces.

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Living Science Physics 8>Chapter 2 - Physical Quantities and Measurement>Exercises>Q D

Match the columns:

1. Mass	a. relative density bottle
2. Volume	b. lactometer
3. Sea breeze	c. Eureka can
4. Density of milk	d. physical balance
5. Relative density	e. convection currents