Hydrometer and Lactometer

Q.

What is Lactometer?

Q.

What is a specific gravity bottle? How is it used to measure the density of a liquid?

Q. Explain the construction and working of a hydrometer with diagram.

Q.

An instrument used to measure the density of milk is called a _________.

Q.

What is the principle of lactometer and hydrometer ?

Q.

A hydrometer is based on

1. Principle of floatation

2. Pascal's law

3. Bernoulli's principle

4. Principle of Relative density.

Q. A body is fully immersed in the water. What can increase of pressure exerted on the bottom surface of the body?

Q.

According to Bernoulli's principle, ___.

1. a decrease in the flow rate of a fluid occurs with a decrease in pressure or a decrease in the fluid's potential energy.

2. an increase in the flow rate of a fluid occurs with a decrease in pressure or a decrease in the fluid's potential energy.

3. an increase in the flow rate of a fluid occurs with an increase in pressure or a decrease in the fluid's potential energy.

4. an increase in the flow rate of a fluid occurs with a decrease in pressure or an increase in the fluid's potential energy.

Q. What is a Lactometer?

Q.

The purity of milk can be tested using________.

Q.

What is the law of floatation? Name an instrument developed on the basis of the law of floatation.

Q.

A deep sea diver jumps into a sea in search of a ship wreck located below the sea level. The suit of the diver helps him maintain his body pressure at the normal atmospheric pressure. This suit can sustain a maximum pressure of 6 atm. The density of sea water is 1.03 × 10³ kg m⁻³

With reference to sea pressure, the diver can safely reach the maximum depth of about

g = 9.8 m/s² & 1atm = 1.01 × 10⁵ Pa

1. 40 m

2. 43 m

3. 52 m

4. 50 m

Q. Which of the following liquids is used as a standard to measure relative density?

1. Alcohol
2. Water
3. Liquid nitrogen
4. Gasoline

Q. A boat floating in fresh water displaces 16000 Newton of water How many Newtons of salt water would it displace when it salt water of specific gravity 1.7 14500, 17600, 16000, 28400

Q. Hydrometer is used to measure

1. Pressure
2. Weight
3. Density
4. Mass

Q. Describe how can we find the relative density of an unknown liquid using Archimedes’ principle? [$4\text{marks}$]

Q.

A hydrometer is used to measure the density of irregular objects.

1. True
2. False

Q. Lactometer is calibrated from hydrometer for what?

1. To measure density of milk
2. To measure density of butter
3. To measure density of water
4. To measure density of air

Q. Explain the construction and working of a hydrometer with diagram.

Q. What are the applications of Archimedes' principle ?

1. It is used in hydraulic lifts.
2. It is used in designing of ships and submarines.
3. It is used in hydrometers to determine density of fluids.
4. It is used in lactometers to determine the purity of milk.

Q. Which of the following is correct regarding the pressure at point Q in the given scenarios?

1. Pressure at point Q will be higher in container A.
2. Pressure at point Q will be higher in container B.
3. Pressure at point Q will be the same in both the containers.

Q.

A hydrometer is used to measure the following quantity of a liquid:

1. relative density

2. volume

3. density of a liquid

4. mass

Q. Milk purity is measured using:

1. Hydrometer
2. Lactometer
3. Polarimeter
4. Spectrometer

Q. We use a lactometer to test whether the milk is pure or not. True or false

1. True
2. False

Q.

Which of the following instruments is used to measure weight?

1. Spring balance.

2. Beam balance.

3. Stopwatch.

4. Thermometer.

Q. The principle of working of hydrometer is based on Archimedes's principle

1. True
2. False

Q.

Which of the following hydrometer is used to check the battery is fully charged?

1. lactometer

2. Acid battery hydrometer

3. Base battery hydrometer

4. Hygrometer

Q. What does hydrometer consists of?

1. cylindrical stem and bulb weighted with mercury
2. cylindrical stem and bulb weighted with water
3. Only cylindrical stem
4. only bulb weighted with mercury

Q. Two identical objects one fully immersed in water and the other in kerosene are as shown in the figure. If the density of water is more than the density of kerosene, comment on the readings shown on the scales.

Q. Hydrometer is used to determine which of the following?

1. Specific gravity of liquids.
2. Boiling point of water.
3. Specific heat of a matter.
4. Specific humidity