Question

5. To ensure that skies do not sink into the snow too far, they

(a) should be flat and have a large area

(b) should be slim and have a small area

(c) should be thin and sharp

(d) should have studs​

Answer 1

Answer:

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Explanation:

should be slim and have a small area

Answer 2

Answer:

Question 1:

What happens when we try to push an inflated balloon into a bucket of water?

ANSWER:

When we try to push an inflated balloon into a bucket of water, the water seems to be pushing the balloon upwards due to the pressure that water exerts on the balloon.

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Question 2:

What is atmospheric pressure due to?

ANSWER:

Atmospheric pressure is the pressure exerted by weight of air above at any point on the earth’s surface.

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Question 3:

Why it is necessary for astronauts to wear pressurized suits?

ANSWER:

In outer space, the pressure is much lower than atmospheric pressure on Earth. At such low pressures, blood pressure in the blood vessels can lead to bursting open of blood vessels and kill a person. To prevent this and allow themselves to work safely in space, astronauts wear pressure suits.

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Question 1:

Write one word for the following.

1. Force per unit area ....................

2. Liquids and gases together ....................

3. An instrument to measure atmospheric pressure ....................

4. An instrument used to measure pressure ....................

ANSWER:

Pressure

Fluids

Barometer

Pressure gauge

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Question 2:

Define/Explain the following.

1. Pressure

2. pascal

3. Atmospheric pressure

4. Liquid pressure

ANSWER:

Pressure is defined as force per unit of area.

Pascal (Pa) is the SI unit of pressure, which is Newton (N) per metre (m2) i.e. N/m2.

Atmospheric pressure is defined as the pressure exerted on an object by the air above it.

Liquid pressure is the pressure exerted on an object by the liquid in which it is immersed, where a net upward force determines whether the object will sink or float.

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Question 1:

Pressure equals

(a) force/volume

(b) force × area

(c) force/area

(d) force × volume

ANSWER:

(c) force/area

Pressure is force per unit area.