Tag: forces in fluids

Quizzes (7) Questions (18)

Questions Related to forces in fluids

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

Hydrometers usually contain a scale inside the stem, so that the person using it can read specific gravity.Is the statement True or False

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
A hydrometer is usually made of glass, and consists of a cylindrical stem and a bulb weighted with mercury to make it float upright. The liquid to test is poured into a tall container and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer correlates to specific gravity. Hydrometers usually contain a scale inside the stem, so that the person using it can read specific gravity. 
Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

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

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 archimedes principle states that weight lost by the body partially or fully immersed in a liquid is equal to the weight of the liquid displaced and hydrometer works on this principle.

so option (A) is correct

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

A cube of ice has a iron piece frozen unside at.
The cube floats an a beakerfilled with water, when the ice melts then the level of water is beaker 

  1. remains same

  2. level decreases

  3. level increases

  4. first increase ans decrese
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to Archimedes' principle, the weight of the displaced water equals the weight of the ice and the iron. When the ice melts, the iron sinks and the water from the melted ice occupies a volume equal to its mass, resulting in no change in the total water level.

Multiple choice physics forces in fluids hydrometer and lactometer comparing density - relative density principle of floatation and its applications

Hydrometers are used to serve what purpose?

  1. For determining density of liquid

  2. Pressure measurement

  3. Viscosity measurement

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Answer is A

A hydrometer is an instrument used to measure the specific gravity (relative density) of liquids; that is, the ratio of the density of the liquid to the density of water. A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright

Multiple choice physics forces in fluids experimental verification of archimedes' principle archimedes' principle archimedes' principle and its applications

The densities of objects P,Q,R and S are ${200 kg/m^3}$, ${450 kg/m^3}$, ${1200 kg/m^3}$  and ${785 kg/m^3}$ respectively. Which one of these objects will sink when dipped in a bucket of water?

  1. P

  2. Q

  3. R

  4. S
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Answer is C.

According to the laws of flotation, the more denser liquid will sink below and the less dense material will float.
In this case, the object R has the maximum density of $1200kg/{ m }^{ 3 }$.
Therefore, object R will sink when dipped in a bucket of water.

Multiple choice physics forces in fluids experimental verification of archimedes' principle archimedes' principle archimedes' principle and its applications

A piece of wood floats in water, completely inside it. What happens when it is dropped in ethanol?

  1. It floats higher

  2. Stays as before

  3. It sinks

  4. It sinks first and then rises
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Since , the ethanol is less denser than the water.Therefore, a piece of wood floating completely in water will sink in the ethanol.

Multiple choice physics forces in fluids experimental verification of archimedes' principle archimedes' principle archimedes' principle and its applications

As the density of a series of liquids increases, the upthrust on the iron rod submerged

  1. Increases

  2. Decreases

  3. Remains constant

  4. Noting can be said
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

As the density of liquid increases & so does the buoyant force on the submerged rod which will result in increase in upthrust.