Tag: introduction to pressure

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Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

A block of wood floats separately in river water and then in ocean water. Then the weight of the displaced river water is

  1. equal to the weight of the displaced ocean water.

  2. less than the weight of the displaced ocean water.

  3. more than the weight of the displaced ocean water.

  4. not dependent on the density of the wooden block.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to the law of flotation, a floating object displaces a weight of fluid equal to its own weight. Since the weight of the wooden block is constant regardless of the fluid it floats in, the weight of the displaced fluid must be the same in both river water and ocean water.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

The fluids in a confined space exert pressure in which direction?

  1. Upward

  2. Downward

  3. Forward

  4. All directions
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pascal's law or the principle of transmission of fluid-pressure is a principle in fluid mechanics that states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations (initial differences) remain the same.

so option ( D) would be correct

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

Fill in the blank.

Liquids exerts pressure in _______ directions.

  1. One

  2. Two

  3. All

  4. It do not extent any pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Like solids fluids (liquids and gases) also exent pressure. A solid exent pressure only in the downward direction due to its weight, whereas liquids and gases exent pressure on the walls of their container.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

If a sweet water fish enters a sea, the fish will

  1. swell

  2. be squeezed

  3. remain as it is

  4. suffer none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Liquid pressure is given by =$\rho \times g \times h$

The water from river has a lower density than the sea water. So, at equal depth, sweet water or river water exerts less pressure than sea water. Body of a sweet water fish is habituated with this lower pressure of river water. Naturally, when the fish will enter the sea, it will suffer greater pressure due to increase in density and hence the body of the fish will be squeezed slightly.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

There are two fish tanks each of depth $0.5 m$. Base area of one is $0.5m^2$ and that of another is $0.1m^2$. At the depth of which tank will a fish feel larger pressure?

  1. The tank of wider base area

  2. The tank of smaller base area

  3. Equal for both tanks

  4. Can't say
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Liquid pressure is given by =$ \rho \times g \times h$
Liquid pressure depends on the depth and not on surface area. Both the tanks have the same depth. So, for both the tanks, the fish will feel equal pressure.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure
Fluids are

  1. The substances which are lighter than air.

  2. The substances which let substances float on them.

  3. The substances which can flow easily.

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

A fluid is a substance such as liquid or gas which can flow easily, has no fixed shape and can changes its shape at a steady rate when acted upon by a force tending to change its shape.

Multiple choice physics forces and matter pressure in fluids pressure in liquids introduction to pressure

If a sea fish enters a river, the fish will

  1. swell

  2. be squeezed

  3. remain as it is

  4. suffer none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Density of sea water is more than that of river water. So, at same depth, sea water exerts greater pressure. And, the body of the sea fish is habituated with the high pressure from outside. Now, as the same fish enters the river, water density being low, will suffer less pressure from outside. As a result, the body of the fish will swell out slightly.