# Pressure in Fluids Exe-4B Very Short Answer Physics Class-9 ICSE Selina Publishers

Pressure in Fluids and Atmospheric Pressure Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer Type for Class-9 ICSE Concise Physics. There is the solutions of Very short Answer type Questions of your latest textbook which is applicable in 2023-24 academic sessionVisit official Website CISCE for detail information about ICSE Board Class-9.

## Pressure in Fluids Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer

(ICSE Class – 9 Physics Concise Selina Publishers)

 Board ICSE Class 9th Subject Physics Writer / Publication Concise selina Publishers Chapter-4 Pressure in Fluids and Atmospheric Pressure Exe – 4B Atmospheric Pressure and it’s Measurement Topics Solution of Exe-4(B) Very Short Answer Type Academic Session 2023-2024

#### Exe-4B Atmospheric Pressure and it’s Measurement Very Short Answer Type

Ch-4 Pressure in Fluids and Atmospheric Pressure Physics Class-9 ICSE Concise

Page 112

#### Answer:

1.013 x 10 5 pascal

#### Answer:

Atmospheric pressure is measured in ‘torr’.

1 torr = 1 mm of Hg.

#### Answer:

At normal temperature and pressure, the barometric height is 0.76 m of Hg at sea level which is taken as one atmosphere.

1 atmosphere = 0.76 m of Hg = 1.013 x 105 pascal

(a) decrease

(b) decrease

#### Answer:

A barometer is used to measure atmospheric pressure.

(Pressure in Fluids and Atmospheric Pressure Exe-4B Very Short Class-9 ICSE)

#### Answer:

The atmospheric pressure at a place is 76 cm of Hg means at normal temperature and pressure, the height of the mercury column supported by the atmospheric pressure is 76 cm.

76 cm of Hg = 1.013 x 105 pascal

#### Question 7. How is the barometric height of a simple barometer affected if

(a) Its tube is pushed down into the trough of mercury?

(b) Its tube is slightly tilted from vertical?

(c) A drop of liquid is inserted inside the tube

#### Answer:

(a) The barometric height remains unaffected.

(b) The barometric height remains unaffected.

(c) The barometric height decreases.

#### Answer:

Two uses of barometer:

(a) To measure the atmospheric pressure.

(b) For weather forecasting

#### Question 9. How is the height of mercury in a barometer affected when it is taken to (i) a mine, and (ii) a hill?

Answer:

(i) In a mine, reading of a barometer increases.

(ii) On hills, reading of barometer decreases.

#### Question 10. What do the following indicate in a barometer regarding weather :

(a) gradual fall in the mercury level,

(b) sudden fall in the mercury level,

(c) Gradual rise in the mercury level?

#### Answer:

(a) It indicates that the moisture is increasing i.e., there is a possibility of rain.

(b) It indicates the coming of a storm or cyclone.

(c) It indicates that the moisture is decreasing i.e., it indicates dry weather.

—  : End of Pressure in Fluids and Atmospheric Pressure Exe-4B Very Short Answer Type  Solutions :–

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