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2.3 GAS PRESSURE

Total questions: 39

Worksheet time: 3hrs 15mins

Name
Class
Date
1.
Where would you find the largest pressure?
a)
At the bottom of the ocean
b)
At the top of Mt Everest
c)
Close to ground on the Scotch oval
d)
In a rockpool on the Great Barrier Reef
2.
What is altitude?
a)
how much something weighs
b)
the distance above sea level
c)
how big something is
d)
how far away something is
3.
As you climb up a mountain what happens to the air pressure?
a)
decreases
b)
increases
c)
stays the same
4.
What happens to the amount of oxygen molecules as altitude increases?
a)
fewer molecules
b)
more molecules
c)
same amount of molecules
d)
nothing happens to the molecules
5.
Air pressure is greatest when near Earth's surface because?
a)
The air molecules are farther apart.
b)
The air molecules are closer together.
c)
Air molecules collide.
d)
Air molecules are tightly packed.
6.
Density of air is greater at high altitudes.
a)
true
b)
false
7.
Altitude is greater __________.
a)
at the bottom of the mountain
b)
at the top of the mountain
c)
at the center of the mountain
8.
Air pressure is greater _______.
a)
at the top of the mountain
b)
at the bottom of the mountain
c)
at the center of the mountain
9.
Density of air is greater ________.
a)
at the top of the mountain
b)
at the bottom of the mountain
c)
at the center of the mountain
10.
Why is it hard to breath at high altitudes?
a)
There is too much oxygen in this location.
b)
There is a higher density of air molecules.
c)
There is a low density of air molecules.
d)
The air pressure is greater than at low altitudes.
11.
If density of air is high, pressure is:
a)
high
b)
low
12.
If density of air is low, pressure is:
a)
high
b)
low
13.

When a diver dives deeper into the ocean, he will experience ...................... liquid pressure

a)

greater

b)

less

c)

no

14.
A device that is used to measure atmospheric pressure is a ___________.
a)
barometer
b)
thermometer
c)
kilometer
d)
micrometer
15.

Choose factors that affect the pressure in liquid.

Pilih faktor yang mempengaruhi tekanan di dalam cecair.

a)

depth

kedalaman

b)

mass

jisim

c)

density

ketumpatan

d)

volume

isipadu

16.

Calculate density of the blue liquid

Hitung ketumpatan cecair biru

a)

755 kg m-3

b)

1200 kg m-3

c)

691 kg m-3

d)

1120 kg m-3

17.

pressure of 1 atm equivalent to:

Tekanan 1 atm bersamaan dengan:

a)

760 mm Hg

b)

10.3 m H2O

c)

100 mbar

d)

100 kPa

18.

Convert 45 cm Hg to unit Pascal

Tukar 45 cm Hg kepada unit Pascal


[density of mercury: 13 600 kg m3]

a)

100 kPa

b)

60 kPa

c)

40 kPa

d)

45 kPa

19.

A wall of seaside can withstand 400 kPa of pressure. What is the pressure in unit m H2O?

Sebuah tebing laut boleh menahan tekanan sebanyak 400 kPa. Apakah tekanan itu dalam unit H2O

[density of water: 1000 kg m-3]

a)

47.70 m

b)

40.77 m

c)

37.47 m

20.

Which are properties of atmospheric pressure at high altitude

Yang manakah ciri-ciri tekanan atmosfera pada altitud yang tinggi.

a)

Thin of air

udara nipis

b)

low number of oxygen gas

rendah bilangan gas oksigen

c)

cooler

lebih sejuk

d)

high pressure

bertekanan tinggi

21.

In outerspace, the pressure is almost zero. What astronauts do to counter it?

Di ruang angkasa, tekanan adalah hampir sifar. Apakah yang dilakukan oleh angkasawan untuk mengatasinya?

a)

pressurize cabin of spacecraft

Beri tekanan pada kabin kapal angkasa.

b)

pressurize space suit

Beri tekanan pada suit angkasa

c)

bring along oxygen tank/generator

bawa bersama tangki/penjana oksigen

d)

build from hard material

diperbuat daripada bahan yang keras

22.

Among these statements, which are effects on human beings at extreme depth under the surface of the sea?

Antara berikut, yang manakah Kesan ke atas manusia dalam keadaan aras kedalaman lampau?

a)

Nitrogen gas dissolves into the blood

Gas nitrogen melarut ke dalam darah

b)

Body tissues absorb excess nitrogen gas

Tisu badan menyerap gas nitrogen yang berlebihan

c)

Formation of nitrogen bubbles in the tissues or blood vessels if pressure is reduced too rapidly

Pembentukan gelembung nitrogen dalam tisu atau salur darah jika tekanan dikurangkan dengan terlalu cepat

d)

Lower absorption of oxygen in the lungs

Penyerapan oksigen dalam paru-paru berkurang

23.
What is the unit of measurement for pressure?
a)
pascal
b)
grams
c)
milliters
d)
meters
24.
Atmospheric pressure increases as you move towards lower elevations and decreases as you move into higher elevations.
a)
True
b)
False
25.
What is the instrument that measures air pressure called?
a)
Graduated cylinder
b)
Barometer
c)
Force scale
d)
Anemometer
26.

What is the pressure difference, in cm of water, shown by the manometer?

a)

9

b)

16

c)

20

d)

25

27.
a)

A

b)

B

c)

C

d)

D

28.

Pressure can be measure in cm of water.

What is the pressure of the gas?

a)

8 cm of water more than atmospheric pressure

b)

12 cm of water more than atmospheric pressure

c)

8 cm of water less than atmospheric pressure

d)

12 cm of water less than atmospheric pressure

29.

What will happen to the height (h) of the mercury column in the manometer shown below if the stopcock is opened, given that the atmospheric pressure is 755 mmHg?

a)

h will decrease

b)

h will not change

c)

h will increase

d)

not enough information given to answer the question

30.

Which gas has a greater pressure?

a)

air

b)

methane

c)

The gas pressures are equal

31.

If the air pressure is 750 mmHg, what is the pressure of Gas B?

a)

695 mmHg

b)

805 mmHg

c)

750 mmHg

d)

55 mmHg

32.

What is the pressure of gas C if the air pressure is 760?

a)

1405 mmHg

b)

645 mmHg

c)

115 mmHg

33.

A manometer is used to measure the pressure of an unknown gas. What is the Pressure of the unknown gas? (atmospheric pressure = 100 kPa, density of mercury = 13,600 kg/m3)

a)

121.8 kPa

b)

128.6 kPa

c)

106.8 kPa

d)

93.2 kPa

34.

If the atmospheric pressure is 740 mmHg, what is the pressure of the methane gas?

a)

740 mmHg

b)

770 mmHg

c)

710 mmHg

d)

30 mmHg

35.

Which gas has a greater pressure?

a)

Gas C

b)

Air

c)

The gas pressures are equal

36.

The pressure inside the toy is

a)

more than the air pressure

b)

less than the air pressure

c)

equal to the air pressure

d)

equal to the gauge pressure

37.

The height difference (here in the picture) between the levels of the u tube manometer is equal to the

a)

atmospheric pressure

b)

the difference between air pressure and gas pressure

c)

none

d)

gas pressure

38.

What is the pressure of trapped gas

a)

76 cm of Hg

b)

(76-10) cm of Hg

c)

(76+10) cm of Hg

d)

10 cm of Hg

39.

Estimate the pressure in the water pipe shown. The manometer is open to the atmosphere.

a)

10 kPa

b)

8 kPa

c)

9 kPa

d)

7 kPa

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